2005-04-16 22:20:36 +00:00
|
|
|
/*
|
|
|
|
* 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>
|
2005-05-30 22:35:26 +00:00
|
|
|
* (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org>
|
2005-04-16 22:20:36 +00:00
|
|
|
*
|
|
|
|
* 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>
|
2007-11-06 04:33:46 +00:00
|
|
|
#include <linux/seq_file.h>
|
2005-04-16 22:20:36 +00:00
|
|
|
#include <linux/security.h>
|
2009-03-16 14:31:10 +00:00
|
|
|
#include <linux/net.h>
|
2006-03-21 06:33:17 +00:00
|
|
|
#include <linux/mutex.h>
|
2007-09-12 10:01:34 +00:00
|
|
|
#include <net/net_namespace.h>
|
2005-04-16 22:20:36 +00:00
|
|
|
#include <net/sock.h>
|
|
|
|
#include <net/route.h>
|
2007-12-05 09:24:48 +00:00
|
|
|
#include <net/netfilter/nf_queue.h>
|
2008-01-09 08:33:11 +00:00
|
|
|
#include <net/ip.h>
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
#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"
|
|
|
|
|
2007-12-05 09:26:33 +00:00
|
|
|
typedef int (*ipq_cmpfn)(struct nf_queue_entry *, unsigned long);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2006-09-20 19:03:46 +00:00
|
|
|
static unsigned char copy_mode __read_mostly = IPQ_COPY_NONE;
|
2006-09-18 07:05:22 +00:00
|
|
|
static unsigned int queue_maxlen __read_mostly = IPQ_QMAX_DEFAULT;
|
2005-04-16 22:20:36 +00:00
|
|
|
static DEFINE_RWLOCK(queue_lock);
|
2006-09-20 19:03:46 +00:00
|
|
|
static int peer_pid __read_mostly;
|
|
|
|
static unsigned int copy_range __read_mostly;
|
2005-04-16 22:20:36 +00:00
|
|
|
static unsigned int queue_total;
|
|
|
|
static unsigned int queue_dropped = 0;
|
|
|
|
static unsigned int queue_user_dropped = 0;
|
2006-09-20 19:03:46 +00:00
|
|
|
static struct sock *ipqnl __read_mostly;
|
2005-04-16 22:20:36 +00:00
|
|
|
static LIST_HEAD(queue_list);
|
2006-03-21 06:33:17 +00:00
|
|
|
static DEFINE_MUTEX(ipqnl_mutex);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
static inline void
|
2007-12-05 09:26:33 +00:00
|
|
|
__ipq_enqueue_entry(struct nf_queue_entry *entry)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2007-12-05 09:25:03 +00:00
|
|
|
list_add_tail(&entry->list, &queue_list);
|
2005-04-16 22:20:36 +00:00
|
|
|
queue_total++;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int
|
|
|
|
__ipq_set_mode(unsigned char mode, unsigned int range)
|
|
|
|
{
|
|
|
|
int status = 0;
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
switch(mode) {
|
|
|
|
case IPQ_COPY_NONE:
|
|
|
|
case IPQ_COPY_META:
|
|
|
|
copy_mode = mode;
|
|
|
|
copy_range = 0;
|
|
|
|
break;
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
case IPQ_COPY_PACKET:
|
|
|
|
copy_mode = mode;
|
|
|
|
copy_range = range;
|
|
|
|
if (copy_range > 0xFFFF)
|
|
|
|
copy_range = 0xFFFF;
|
|
|
|
break;
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
default:
|
|
|
|
status = -EINVAL;
|
|
|
|
|
|
|
|
}
|
|
|
|
return status;
|
|
|
|
}
|
|
|
|
|
2007-12-05 09:25:46 +00:00
|
|
|
static void __ipq_flush(ipq_cmpfn cmpfn, unsigned long data);
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
static inline void
|
|
|
|
__ipq_reset(void)
|
|
|
|
{
|
|
|
|
peer_pid = 0;
|
|
|
|
net_disable_timestamp();
|
|
|
|
__ipq_set_mode(IPQ_COPY_NONE, 0);
|
2007-12-05 09:25:46 +00:00
|
|
|
__ipq_flush(NULL, 0);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2007-12-05 09:26:33 +00:00
|
|
|
static struct nf_queue_entry *
|
2007-12-05 09:25:46 +00:00
|
|
|
ipq_find_dequeue_entry(unsigned long id)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2007-12-05 09:26:33 +00:00
|
|
|
struct nf_queue_entry *entry = NULL, *i;
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
write_lock_bh(&queue_lock);
|
2007-12-05 09:25:46 +00:00
|
|
|
|
|
|
|
list_for_each_entry(i, &queue_list, list) {
|
|
|
|
if ((unsigned long)i == id) {
|
|
|
|
entry = i;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (entry) {
|
|
|
|
list_del(&entry->list);
|
|
|
|
queue_total--;
|
|
|
|
}
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
write_unlock_bh(&queue_lock);
|
|
|
|
return entry;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
2007-12-05 09:25:46 +00:00
|
|
|
__ipq_flush(ipq_cmpfn cmpfn, unsigned long data)
|
|
|
|
{
|
2007-12-05 09:26:33 +00:00
|
|
|
struct nf_queue_entry *entry, *next;
|
2007-12-05 09:25:46 +00:00
|
|
|
|
|
|
|
list_for_each_entry_safe(entry, next, &queue_list, list) {
|
|
|
|
if (!cmpfn || cmpfn(entry, data)) {
|
|
|
|
list_del(&entry->list);
|
|
|
|
queue_total--;
|
2007-12-05 09:27:02 +00:00
|
|
|
nf_reinject(entry, NF_DROP);
|
2007-12-05 09:25:46 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
ipq_flush(ipq_cmpfn cmpfn, unsigned long data)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
write_lock_bh(&queue_lock);
|
2007-12-05 09:25:46 +00:00
|
|
|
__ipq_flush(cmpfn, data);
|
2005-04-16 22:20:36 +00:00
|
|
|
write_unlock_bh(&queue_lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct sk_buff *
|
2007-12-05 09:26:33 +00:00
|
|
|
ipq_build_packet_message(struct nf_queue_entry *entry, int *errp)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2007-04-20 03:29:13 +00:00
|
|
|
sk_buff_data_t old_tail;
|
2005-04-16 22:20:36 +00:00
|
|
|
size_t size = 0;
|
|
|
|
size_t data_len = 0;
|
|
|
|
struct sk_buff *skb;
|
|
|
|
struct ipq_packet_msg *pmsg;
|
|
|
|
struct nlmsghdr *nlh;
|
2007-04-19 23:16:32 +00:00
|
|
|
struct timeval tv;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
read_lock_bh(&queue_lock);
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
switch (copy_mode) {
|
|
|
|
case IPQ_COPY_META:
|
|
|
|
case IPQ_COPY_NONE:
|
|
|
|
size = NLMSG_SPACE(sizeof(*pmsg));
|
|
|
|
break;
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
case IPQ_COPY_PACKET:
|
2006-08-29 23:44:56 +00:00
|
|
|
if ((entry->skb->ip_summed == CHECKSUM_PARTIAL ||
|
|
|
|
entry->skb->ip_summed == CHECKSUM_COMPLETE) &&
|
|
|
|
(*errp = skb_checksum_help(entry->skb))) {
|
2005-08-23 17:10:35 +00:00
|
|
|
read_unlock_bh(&queue_lock);
|
|
|
|
return NULL;
|
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
if (copy_range == 0 || copy_range > entry->skb->len)
|
|
|
|
data_len = entry->skb->len;
|
|
|
|
else
|
|
|
|
data_len = copy_range;
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
size = NLMSG_SPACE(sizeof(*pmsg) + data_len);
|
|
|
|
break;
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
default:
|
|
|
|
*errp = -EINVAL;
|
|
|
|
read_unlock_bh(&queue_lock);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
read_unlock_bh(&queue_lock);
|
|
|
|
|
|
|
|
skb = alloc_skb(size, GFP_ATOMIC);
|
|
|
|
if (!skb)
|
|
|
|
goto nlmsg_failure;
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2007-04-20 03:29:13 +00:00
|
|
|
old_tail = skb->tail;
|
2005-04-16 22:20:36 +00:00
|
|
|
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;
|
2007-04-19 23:16:32 +00:00
|
|
|
tv = ktime_to_timeval(entry->skb->tstamp);
|
|
|
|
pmsg->timestamp_sec = tv.tv_sec;
|
|
|
|
pmsg->timestamp_usec = tv.tv_usec;
|
2006-11-09 23:19:14 +00:00
|
|
|
pmsg->mark = entry->skb->mark;
|
2007-12-05 09:26:33 +00:00
|
|
|
pmsg->hook = entry->hook;
|
2005-04-16 22:20:36 +00:00
|
|
|
pmsg->hw_protocol = entry->skb->protocol;
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2007-12-05 09:26:33 +00:00
|
|
|
if (entry->indev)
|
|
|
|
strcpy(pmsg->indev_name, entry->indev->name);
|
2005-04-16 22:20:36 +00:00
|
|
|
else
|
|
|
|
pmsg->indev_name[0] = '\0';
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2007-12-05 09:26:33 +00:00
|
|
|
if (entry->outdev)
|
|
|
|
strcpy(pmsg->outdev_name, entry->outdev->name);
|
2005-04-16 22:20:36 +00:00
|
|
|
else
|
|
|
|
pmsg->outdev_name[0] = '\0';
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2007-12-05 09:26:33 +00:00
|
|
|
if (entry->indev && entry->skb->dev) {
|
2005-04-16 22:20:36 +00:00
|
|
|
pmsg->hw_type = entry->skb->dev->type;
|
2007-09-27 05:13:38 +00:00
|
|
|
pmsg->hw_addrlen = dev_parse_header(entry->skb,
|
|
|
|
pmsg->hw_addr);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
if (data_len)
|
|
|
|
if (skb_copy_bits(entry->skb, 0, pmsg->payload, data_len))
|
|
|
|
BUG();
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
nlh->nlmsg_len = skb->tail - old_tail;
|
|
|
|
return skb;
|
|
|
|
|
|
|
|
nlmsg_failure:
|
|
|
|
*errp = -EINVAL;
|
|
|
|
printk(KERN_ERR "ip_queue: error creating packet message\n");
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
2007-12-05 09:26:33 +00:00
|
|
|
ipq_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
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)
|
2007-12-05 09:26:33 +00:00
|
|
|
return status;
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
write_lock_bh(&queue_lock);
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
if (!peer_pid)
|
2007-02-09 14:24:47 +00:00
|
|
|
goto err_out_free_nskb;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
if (queue_total >= queue_maxlen) {
|
2007-02-09 14:24:47 +00:00
|
|
|
queue_dropped++;
|
2005-04-16 22:20:36 +00:00
|
|
|
status = -ENOSPC;
|
|
|
|
if (net_ratelimit())
|
2007-02-09 14:24:47 +00:00
|
|
|
printk (KERN_WARNING "ip_queue: full at %d entries, "
|
2005-04-16 22:20:36 +00:00
|
|
|
"dropping packets(s). Dropped: %d\n", queue_total,
|
|
|
|
queue_dropped);
|
|
|
|
goto err_out_free_nskb;
|
|
|
|
}
|
|
|
|
|
2007-02-09 14:24:47 +00:00
|
|
|
/* netlink_unicast will either free the nskb or attach it to a socket */
|
2005-04-16 22:20:36 +00:00
|
|
|
status = netlink_unicast(ipqnl, nskb, peer_pid, MSG_DONTWAIT);
|
|
|
|
if (status < 0) {
|
2007-02-09 14:24:47 +00:00
|
|
|
queue_user_dropped++;
|
2005-04-16 22:20:36 +00:00
|
|
|
goto err_out_unlock;
|
|
|
|
}
|
|
|
|
|
|
|
|
__ipq_enqueue_entry(entry);
|
|
|
|
|
|
|
|
write_unlock_bh(&queue_lock);
|
|
|
|
return status;
|
|
|
|
|
|
|
|
err_out_free_nskb:
|
2007-02-09 14:24:47 +00:00
|
|
|
kfree_skb(nskb);
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
err_out_unlock:
|
|
|
|
write_unlock_bh(&queue_lock);
|
|
|
|
return status;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
2007-12-05 09:26:33 +00:00
|
|
|
ipq_mangle_ipv4(ipq_verdict_msg_t *v, struct nf_queue_entry *e)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
int diff;
|
|
|
|
struct iphdr *user_iph = (struct iphdr *)v->payload;
|
2008-02-20 01:17:52 +00:00
|
|
|
struct sk_buff *nskb;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
if (v->data_len < sizeof(*user_iph))
|
|
|
|
return 0;
|
|
|
|
diff = v->data_len - e->skb->len;
|
2006-11-15 03:48:09 +00:00
|
|
|
if (diff < 0) {
|
|
|
|
if (pskb_trim(e->skb, v->data_len))
|
|
|
|
return -ENOMEM;
|
|
|
|
} else if (diff > 0) {
|
2005-04-16 22:20:36 +00:00
|
|
|
if (v->data_len > 0xFFFF)
|
|
|
|
return -EINVAL;
|
|
|
|
if (diff > skb_tailroom(e->skb)) {
|
netfilter: {nfnetlink,ip,ip6}_queue: fix skb_over_panic when enlarging packets
While reinjecting *bigger* modified versions of IPv6 packets using
libnetfilter_queue, things work fine on a 2.6.24 kernel (2.6.22 too)
but I get the following on recents kernels (2.6.25, trace below is
against today's net-2.6 git tree):
skb_over_panic: text:c04fddb0 len:696 put:632 head:f7592c00 data:f7592c00 tail:0xf7592eb8 end:0xf7592e80 dev:eth0
------------[ cut here ]------------
invalid opcode: 0000 [#1] PREEMPT
Process sendd (pid: 3657, ti=f6014000 task=f77c31d0 task.ti=f6014000)
Stack: c071e638 c04fddb0 000002b8 00000278 f7592c00 f7592c00 f7592eb8 f7592e80
f763c000 f6bc5200 f7592c40 f6015c34 c04cdbfc f6bc5200 00000278 f6015c60
c04fddb0 00000020 f72a10c0 f751b420 00000001 0000000a 000002b8 c065582c
Call Trace:
[<c04fddb0>] ? nfqnl_recv_verdict+0x1c0/0x2e0
[<c04cdbfc>] ? skb_put+0x3c/0x40
[<c04fddb0>] ? nfqnl_recv_verdict+0x1c0/0x2e0
[<c04fd115>] ? nfnetlink_rcv_msg+0xf5/0x160
[<c04fd03e>] ? nfnetlink_rcv_msg+0x1e/0x160
[<c04fd020>] ? nfnetlink_rcv_msg+0x0/0x160
[<c04f8ed7>] ? netlink_rcv_skb+0x77/0xa0
[<c04fcefc>] ? nfnetlink_rcv+0x1c/0x30
[<c04f8c73>] ? netlink_unicast+0x243/0x2b0
[<c04cfaba>] ? memcpy_fromiovec+0x4a/0x70
[<c04f9406>] ? netlink_sendmsg+0x1c6/0x270
[<c04c8244>] ? sock_sendmsg+0xc4/0xf0
[<c011970d>] ? set_next_entity+0x1d/0x50
[<c0133a80>] ? autoremove_wake_function+0x0/0x40
[<c0118f9e>] ? __wake_up_common+0x3e/0x70
[<c0342fbf>] ? n_tty_receive_buf+0x34f/0x1280
[<c011d308>] ? __wake_up+0x68/0x70
[<c02cea47>] ? copy_from_user+0x37/0x70
[<c04cfd7c>] ? verify_iovec+0x2c/0x90
[<c04c837a>] ? sys_sendmsg+0x10a/0x230
[<c011967a>] ? __dequeue_entity+0x2a/0xa0
[<c011970d>] ? set_next_entity+0x1d/0x50
[<c0345397>] ? pty_write+0x47/0x60
[<c033d59b>] ? tty_default_put_char+0x1b/0x20
[<c011d2e9>] ? __wake_up+0x49/0x70
[<c033df99>] ? tty_ldisc_deref+0x39/0x90
[<c033ff20>] ? tty_write+0x1a0/0x1b0
[<c04c93af>] ? sys_socketcall+0x7f/0x260
[<c0102ff9>] ? sysenter_past_esp+0x6a/0x91
[<c05f0000>] ? snd_intel8x0m_probe+0x270/0x6e0
=======================
Code: 00 00 89 5c 24 14 8b 98 9c 00 00 00 89 54 24 0c 89 5c 24 10 8b 40 50 89 4c 24 04 c7 04 24 38 e6 71 c0 89 44 24 08 e8 c4 46 c5 ff <0f> 0b eb fe 55 89 e5 56 89 d6 53 89 c3 83 ec 0c 8b 40 50 39 d0
EIP: [<c04ccdfc>] skb_over_panic+0x5c/0x60 SS:ESP 0068:f6015bf8
Looking at the code, I ended up in nfq_mangle() function (called by
nfqnl_recv_verdict()) which performs a call to skb_copy_expand() due to
the increased size of data passed to the function. AFAICT, it should ask
for 'diff' instead of 'diff - skb_tailroom(e->skb)'. Because the
resulting sk_buff has not enough space to support the skb_put(skb, diff)
call a few lines later, this results in the call to skb_over_panic().
The patch below asks for allocation of a copy with enough space for
mangled packet and the same amount of headroom as old sk_buff. While
looking at how the regression appeared (e2b58a67), I noticed the same
pattern in ipq_mangle_ipv6() and ipq_mangle_ipv4(). The patch corrects
those locations too.
Tested with bigger reinjected IPv6 packets (nfqnl_mangle() path), things
are ok (2.6.25 and today's net-2.6 git tree).
Signed-off-by: Arnaud Ebalard <arno@natisbad.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-04-29 10:16:34 +00:00
|
|
|
nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
|
|
|
|
diff, GFP_ATOMIC);
|
2008-02-20 01:17:52 +00:00
|
|
|
if (!nskb) {
|
2007-10-14 07:39:55 +00:00
|
|
|
printk(KERN_WARNING "ip_queue: error "
|
2008-02-20 01:17:52 +00:00
|
|
|
"in mangle, dropping packet\n");
|
|
|
|
return -ENOMEM;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
2008-02-20 01:17:52 +00:00
|
|
|
kfree_skb(e->skb);
|
|
|
|
e->skb = nskb;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
skb_put(e->skb, diff);
|
|
|
|
}
|
2007-10-14 07:39:18 +00:00
|
|
|
if (!skb_make_writable(e->skb, v->data_len))
|
2005-04-16 22:20:36 +00:00
|
|
|
return -ENOMEM;
|
2007-03-31 14:55:19 +00:00
|
|
|
skb_copy_to_linear_data(e->skb, v->payload, v->data_len);
|
2005-08-23 17:10:35 +00:00
|
|
|
e->skb->ip_summed = CHECKSUM_NONE;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
ipq_set_verdict(struct ipq_verdict_msg *vmsg, unsigned int len)
|
|
|
|
{
|
2007-12-05 09:26:33 +00:00
|
|
|
struct nf_queue_entry *entry;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
if (vmsg->value > NF_MAX_VERDICT)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2007-12-05 09:25:46 +00:00
|
|
|
entry = ipq_find_dequeue_entry(vmsg->id);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (entry == NULL)
|
|
|
|
return -ENOENT;
|
|
|
|
else {
|
|
|
|
int verdict = vmsg->value;
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
if (vmsg->data_len && vmsg->data_len == len)
|
|
|
|
if (ipq_mangle_ipv4(vmsg, entry) < 0)
|
|
|
|
verdict = NF_DROP;
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2007-12-05 09:27:02 +00:00
|
|
|
nf_reinject(entry, verdict);
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
ipq_set_mode(unsigned char mode, unsigned int range)
|
|
|
|
{
|
|
|
|
int status;
|
|
|
|
|
|
|
|
write_lock_bh(&queue_lock);
|
|
|
|
status = __ipq_set_mode(mode, range);
|
|
|
|
write_unlock_bh(&queue_lock);
|
|
|
|
return status;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
ipq_receive_peer(struct ipq_peer_msg *pmsg,
|
2007-02-09 14:24:47 +00:00
|
|
|
unsigned char type, unsigned int len)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
int status = 0;
|
|
|
|
|
|
|
|
if (len < sizeof(*pmsg))
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
switch (type) {
|
|
|
|
case IPQM_MODE:
|
|
|
|
status = ipq_set_mode(pmsg->msg.mode.value,
|
2007-02-09 14:24:47 +00:00
|
|
|
pmsg->msg.mode.range);
|
2005-04-16 22:20:36 +00:00
|
|
|
break;
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
case IPQM_VERDICT:
|
|
|
|
if (pmsg->msg.verdict.value > NF_MAX_VERDICT)
|
|
|
|
status = -EINVAL;
|
|
|
|
else
|
|
|
|
status = ipq_set_verdict(&pmsg->msg.verdict,
|
2007-02-09 14:24:47 +00:00
|
|
|
len - sizeof(*pmsg));
|
2005-04-16 22:20:36 +00:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
status = -EINVAL;
|
|
|
|
}
|
|
|
|
return status;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
2007-12-05 09:26:33 +00:00
|
|
|
dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2007-12-05 09:26:33 +00:00
|
|
|
if (entry->indev)
|
|
|
|
if (entry->indev->ifindex == ifindex)
|
2005-04-16 22:20:36 +00:00
|
|
|
return 1;
|
2007-12-05 09:26:33 +00:00
|
|
|
if (entry->outdev)
|
|
|
|
if (entry->outdev->ifindex == ifindex)
|
2005-04-16 22:20:36 +00:00
|
|
|
return 1;
|
2006-06-27 10:01:48 +00:00
|
|
|
#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)
|
2007-02-09 14:24:47 +00:00
|
|
|
return 1;
|
2006-06-27 10:01:48 +00:00
|
|
|
}
|
|
|
|
#endif
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
ipq_dev_drop(int ifindex)
|
|
|
|
{
|
2007-12-05 09:25:46 +00:00
|
|
|
ipq_flush(dev_cmp, ifindex);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
|
|
|
|
|
|
|
|
static inline void
|
2007-10-11 04:15:29 +00:00
|
|
|
__ipq_rcv_skb(struct sk_buff *skb)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
int status, type, pid, flags, nlmsglen, skblen;
|
|
|
|
struct nlmsghdr *nlh;
|
|
|
|
|
|
|
|
skblen = skb->len;
|
|
|
|
if (skblen < sizeof(*nlh))
|
|
|
|
return;
|
|
|
|
|
2007-04-26 02:08:35 +00:00
|
|
|
nlh = nlmsg_hdr(skb);
|
2005-04-16 22:20:36 +00:00
|
|
|
nlmsglen = nlh->nlmsg_len;
|
|
|
|
if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen)
|
|
|
|
return;
|
|
|
|
|
|
|
|
pid = nlh->nlmsg_pid;
|
|
|
|
flags = nlh->nlmsg_flags;
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
if(pid <= 0 || !(flags & NLM_F_REQUEST) || flags & NLM_F_MULTI)
|
|
|
|
RCV_SKB_FAIL(-EINVAL);
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
if (flags & MSG_TRUNC)
|
|
|
|
RCV_SKB_FAIL(-ECOMM);
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
type = nlh->nlmsg_type;
|
|
|
|
if (type < NLMSG_NOOP || type >= IPQM_MAX)
|
|
|
|
RCV_SKB_FAIL(-EINVAL);
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
if (type <= IPQM_BASE)
|
|
|
|
return;
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2006-06-27 20:26:11 +00:00
|
|
|
if (security_netlink_recv(skb, CAP_NET_ADMIN))
|
2005-04-16 22:20:36 +00:00
|
|
|
RCV_SKB_FAIL(-EPERM);
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
write_lock_bh(&queue_lock);
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
if (peer_pid) {
|
|
|
|
if (peer_pid != pid) {
|
|
|
|
write_unlock_bh(&queue_lock);
|
|
|
|
RCV_SKB_FAIL(-EBUSY);
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
net_enable_timestamp();
|
|
|
|
peer_pid = pid;
|
|
|
|
}
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
write_unlock_bh(&queue_lock);
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
status = ipq_receive_peer(NLMSG_DATA(nlh), type,
|
2007-02-09 14:24:47 +00:00
|
|
|
nlmsglen - NLMSG_LENGTH(0));
|
2005-04-16 22:20:36 +00:00
|
|
|
if (status < 0)
|
|
|
|
RCV_SKB_FAIL(status);
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
if (flags & NLM_F_ACK)
|
|
|
|
netlink_ack(skb, nlh, 0);
|
2007-02-09 14:24:47 +00:00
|
|
|
return;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
2007-10-11 04:15:29 +00:00
|
|
|
ipq_rcv_skb(struct sk_buff *skb)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2006-03-21 06:33:17 +00:00
|
|
|
mutex_lock(&ipqnl_mutex);
|
2007-10-11 04:15:29 +00:00
|
|
|
__ipq_rcv_skb(skb);
|
2006-03-21 06:33:17 +00:00
|
|
|
mutex_unlock(&ipqnl_mutex);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
ipq_rcv_dev_event(struct notifier_block *this,
|
2007-02-09 14:24:47 +00:00
|
|
|
unsigned long event, void *ptr)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
struct net_device *dev = ptr;
|
|
|
|
|
2008-07-20 05:34:43 +00:00
|
|
|
if (!net_eq(dev_net(dev), &init_net))
|
2007-09-12 11:02:17 +00:00
|
|
|
return NOTIFY_DONE;
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
/* 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,
|
2007-02-09 14:24:47 +00:00
|
|
|
unsigned long event, void *ptr)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
struct netlink_notify *n = ptr;
|
|
|
|
|
|
|
|
if (event == NETLINK_URELEASE &&
|
|
|
|
n->protocol == NETLINK_FIREWALL && n->pid) {
|
|
|
|
write_lock_bh(&queue_lock);
|
2007-09-12 11:05:38 +00:00
|
|
|
if ((n->net == &init_net) && (n->pid == peer_pid))
|
2005-04-16 22:20:36 +00:00
|
|
|
__ipq_reset();
|
|
|
|
write_unlock_bh(&queue_lock);
|
|
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct notifier_block ipq_nl_notifier = {
|
|
|
|
.notifier_call = ipq_rcv_nl_event,
|
|
|
|
};
|
|
|
|
|
2008-01-31 12:54:18 +00:00
|
|
|
#ifdef CONFIG_SYSCTL
|
2005-04-16 22:20:36 +00:00
|
|
|
static struct ctl_table_header *ipq_sysctl_header;
|
|
|
|
|
|
|
|
static ctl_table ipq_table[] = {
|
|
|
|
{
|
|
|
|
.ctl_name = NET_IPQ_QMAX,
|
|
|
|
.procname = NET_IPQ_QMAX_NAME,
|
|
|
|
.data = &queue_maxlen,
|
|
|
|
.maxlen = sizeof(queue_maxlen),
|
|
|
|
.mode = 0644,
|
|
|
|
.proc_handler = proc_dointvec
|
|
|
|
},
|
2007-02-09 14:24:47 +00:00
|
|
|
{ .ctl_name = 0 }
|
2005-04-16 22:20:36 +00:00
|
|
|
};
|
2008-01-31 12:54:18 +00:00
|
|
|
#endif
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-01-31 12:54:18 +00:00
|
|
|
#ifdef CONFIG_PROC_FS
|
2007-11-06 04:33:46 +00:00
|
|
|
static int ip_queue_show(struct seq_file *m, void *v)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
read_lock_bh(&queue_lock);
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2007-11-06 04:33:46 +00:00
|
|
|
seq_printf(m,
|
2007-02-09 14:24:47 +00:00
|
|
|
"Peer PID : %d\n"
|
|
|
|
"Copy mode : %hu\n"
|
|
|
|
"Copy range : %u\n"
|
|
|
|
"Queue length : %u\n"
|
|
|
|
"Queue max. length : %u\n"
|
2005-04-16 22:20:36 +00:00
|
|
|
"Queue dropped : %u\n"
|
|
|
|
"Netlink dropped : %u\n",
|
2007-02-09 14:24:47 +00:00
|
|
|
peer_pid,
|
|
|
|
copy_mode,
|
|
|
|
copy_range,
|
|
|
|
queue_total,
|
|
|
|
queue_maxlen,
|
2005-04-16 22:20:36 +00:00
|
|
|
queue_dropped,
|
|
|
|
queue_user_dropped);
|
|
|
|
|
|
|
|
read_unlock_bh(&queue_lock);
|
2007-11-06 04:33:46 +00:00
|
|
|
return 0;
|
|
|
|
}
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2007-11-06 04:33:46 +00:00
|
|
|
static int ip_queue_open(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
return single_open(file, ip_queue_show, NULL);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
2007-11-06 04:33:46 +00:00
|
|
|
|
|
|
|
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,
|
|
|
|
};
|
2008-01-31 12:54:18 +00:00
|
|
|
#endif
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2007-12-05 09:23:57 +00:00
|
|
|
static const struct nf_queue_handler nfqh = {
|
2005-08-10 03:23:11 +00:00
|
|
|
.name = "ip_queue",
|
|
|
|
.outfn = &ipq_enqueue_packet,
|
|
|
|
};
|
|
|
|
|
2006-04-06 21:11:30 +00:00
|
|
|
static int __init ip_queue_init(void)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
int status = -ENOMEM;
|
2008-01-31 12:54:18 +00:00
|
|
|
struct proc_dir_entry *proc __maybe_unused;
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
netlink_register_notifier(&ipq_nl_notifier);
|
2007-09-12 11:05:38 +00:00
|
|
|
ipqnl = netlink_kernel_create(&init_net, NETLINK_FIREWALL, 0,
|
2007-10-11 04:15:29 +00:00
|
|
|
ipq_rcv_skb, NULL, THIS_MODULE);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (ipqnl == NULL) {
|
|
|
|
printk(KERN_ERR "ip_queue: failed to create netlink socket\n");
|
|
|
|
goto cleanup_netlink_notifier;
|
|
|
|
}
|
|
|
|
|
2008-01-31 12:54:18 +00:00
|
|
|
#ifdef CONFIG_PROC_FS
|
2008-03-27 23:55:53 +00:00
|
|
|
proc = proc_create(IPQ_PROC_FS_NAME, 0, init_net.proc_net,
|
|
|
|
&ip_queue_proc_fops);
|
|
|
|
if (!proc) {
|
2005-04-16 22:20:36 +00:00
|
|
|
printk(KERN_ERR "ip_queue: failed to create proc entry\n");
|
|
|
|
goto cleanup_ipqnl;
|
|
|
|
}
|
2008-01-31 12:54:18 +00:00
|
|
|
#endif
|
2005-04-16 22:20:36 +00:00
|
|
|
register_netdevice_notifier(&ipq_dev_notifier);
|
2008-01-31 12:54:18 +00:00
|
|
|
#ifdef CONFIG_SYSCTL
|
2008-01-09 08:33:11 +00:00
|
|
|
ipq_sysctl_header = register_sysctl_paths(net_ipv4_ctl_path, ipq_table);
|
2008-01-31 12:54:18 +00:00
|
|
|
#endif
|
2005-08-10 03:23:11 +00:00
|
|
|
status = nf_register_queue_handler(PF_INET, &nfqh);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (status < 0) {
|
|
|
|
printk(KERN_ERR "ip_queue: failed to register queue handler\n");
|
|
|
|
goto cleanup_sysctl;
|
|
|
|
}
|
|
|
|
return status;
|
|
|
|
|
|
|
|
cleanup_sysctl:
|
2008-01-31 12:54:18 +00:00
|
|
|
#ifdef CONFIG_SYSCTL
|
2005-04-16 22:20:36 +00:00
|
|
|
unregister_sysctl_table(ipq_sysctl_header);
|
2008-01-31 12:54:18 +00:00
|
|
|
#endif
|
2005-04-16 22:20:36 +00:00
|
|
|
unregister_netdevice_notifier(&ipq_dev_notifier);
|
2007-09-12 10:01:34 +00:00
|
|
|
proc_net_remove(&init_net, IPQ_PROC_FS_NAME);
|
2008-01-31 12:54:18 +00:00
|
|
|
cleanup_ipqnl: __maybe_unused
|
2008-01-28 22:41:19 +00:00
|
|
|
netlink_kernel_release(ipqnl);
|
2006-03-21 06:33:17 +00:00
|
|
|
mutex_lock(&ipqnl_mutex);
|
|
|
|
mutex_unlock(&ipqnl_mutex);
|
2007-02-09 14:24:47 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
cleanup_netlink_notifier:
|
|
|
|
netlink_unregister_notifier(&ipq_nl_notifier);
|
|
|
|
return status;
|
|
|
|
}
|
|
|
|
|
2006-03-29 00:37:06 +00:00
|
|
|
static void __exit ip_queue_fini(void)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2006-04-06 21:11:30 +00:00
|
|
|
nf_unregister_queue_handlers(&nfqh);
|
|
|
|
synchronize_net();
|
2007-12-05 09:25:46 +00:00
|
|
|
ipq_flush(NULL, 0);
|
2006-04-06 21:11:30 +00:00
|
|
|
|
2008-01-31 12:54:18 +00:00
|
|
|
#ifdef CONFIG_SYSCTL
|
2006-04-06 21:11:30 +00:00
|
|
|
unregister_sysctl_table(ipq_sysctl_header);
|
2008-01-31 12:54:18 +00:00
|
|
|
#endif
|
2006-04-06 21:11:30 +00:00
|
|
|
unregister_netdevice_notifier(&ipq_dev_notifier);
|
2007-09-12 10:01:34 +00:00
|
|
|
proc_net_remove(&init_net, IPQ_PROC_FS_NAME);
|
2006-04-06 21:11:30 +00:00
|
|
|
|
2008-01-28 22:41:19 +00:00
|
|
|
netlink_kernel_release(ipqnl);
|
2006-04-06 21:11:30 +00:00
|
|
|
mutex_lock(&ipqnl_mutex);
|
|
|
|
mutex_unlock(&ipqnl_mutex);
|
|
|
|
|
|
|
|
netlink_unregister_notifier(&ipq_nl_notifier);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
MODULE_DESCRIPTION("IPv4 packet queue handler");
|
|
|
|
MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
|
|
|
|
MODULE_LICENSE("GPL");
|
2009-03-16 14:31:10 +00:00
|
|
|
MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_FIREWALL);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2006-03-29 00:37:06 +00:00
|
|
|
module_init(ip_queue_init);
|
|
|
|
module_exit(ip_queue_fini);
|