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|
/*
* netfilter module for userspace packet logging daemons
*
* (C) 2000-2004 by Harald Welte <laforge@netfilter.org>
* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
* (C) 2005-2007 Patrick McHardy <kaber@trash.net>
*
* 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.
*
* This module accepts two parameters:
*
* nlbufsiz:
* The parameter specifies how big the buffer for each netlink multicast
* group is. e.g. If you say nlbufsiz=8192, up to eight kb of packets will
* get accumulated in the kernel until they are sent to userspace. It is
* NOT possible to allocate more than 128kB, and it is strongly discouraged,
* because atomically allocating 128kB inside the network rx softirq is not
* reliable. Please also keep in mind that this buffer size is allocated for
* each nlgroup you are using, so the total kernel memory usage increases
* by that factor.
*
* Actually you should use nlbufsiz a bit smaller than PAGE_SIZE, since
* nlbufsiz is used with alloc_skb, which adds another
* sizeof(struct skb_shared_info). Use NLMSG_GOODSIZE instead.
*
* flushtimeout:
* Specify, after how many hundredths of a second the queue should be
* flushed even if it is not full yet.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/socket.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <net/netlink.h>
#include <linux/netdevice.h>
#include <linux/mm.h>
#include <linux/moduleparam.h>
#include <linux/netfilter.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_ipv4/ipt_ULOG.h>
#include <net/netfilter/nf_log.h>
#include <net/netns/generic.h>
#include <net/sock.h>
#include <linux/bitops.h>
#include <asm/unaligned.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
MODULE_DESCRIPTION("Xtables: packet logging to netlink using ULOG");
MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_NFLOG);
#define ULOG_NL_EVENT 111 /* Harald's favorite number */
#define ULOG_MAXNLGROUPS 32 /* numer of nlgroups */
static unsigned int nlbufsiz = NLMSG_GOODSIZE;
module_param(nlbufsiz, uint, 0400);
MODULE_PARM_DESC(nlbufsiz, "netlink buffer size");
static unsigned int flushtimeout = 10;
module_param(flushtimeout, uint, 0600);
MODULE_PARM_DESC(flushtimeout, "buffer flush timeout (hundredths of a second)");
static bool nflog = true;
module_param(nflog, bool, 0400);
MODULE_PARM_DESC(nflog, "register as internal netfilter logging module");
/* global data structures */
typedef struct {
unsigned int qlen; /* number of nlmsgs' in the skb */
struct nlmsghdr *lastnlh; /* netlink header of last msg in skb */
struct sk_buff *skb; /* the pre-allocated skb */
struct timer_list timer; /* the timer function */
} ulog_buff_t;
static int ulog_net_id __read_mostly;
struct ulog_net {
unsigned int nlgroup[ULOG_MAXNLGROUPS];
ulog_buff_t ulog_buffers[ULOG_MAXNLGROUPS];
struct sock *nflognl;
spinlock_t lock;
};
static struct ulog_net *ulog_pernet(struct net *net)
{
return net_generic(net, ulog_net_id);
}
/* send one ulog_buff_t to userspace */
static void ulog_send(struct ulog_net *ulog, unsigned int nlgroupnum)
{
ulog_buff_t *ub = &ulog->ulog_buffers[nlgroupnum];
pr_debug("ulog_send: timer is deleting\n");
del_timer(&ub->timer);
if (!ub->skb) {
pr_debug("ulog_send: nothing to send\n");
return;
}
/* last nlmsg needs NLMSG_DONE */
if (ub->qlen > 1)
ub->lastnlh->nlmsg_type = NLMSG_DONE;
NETLINK_CB(ub->skb).dst_group = nlgroupnum + 1;
pr_debug("throwing %d packets to netlink group %u\n",
ub->qlen, nlgroupnum + 1);
netlink_broadcast(ulog->nflognl, ub->skb, 0, nlgroupnum + 1,
GFP_ATOMIC);
ub->qlen = 0;
ub->skb = NULL;
ub->lastnlh = NULL;
}
/* timer function to flush queue in flushtimeout time */
static void ulog_timer(unsigned long data)
{
struct ulog_net *ulog = container_of((void *)data,
struct ulog_net,
nlgroup[*(unsigned int *)data]);
pr_debug("timer function called, calling ulog_send\n");
/* lock to protect against somebody modifying our structure
* from ipt_ulog_target at the same time */
spin_lock_bh(&ulog->lock);
ulog_send(ulog, data);
spin_unlock_bh(&ulog->lock);
}
static struct sk_buff *ulog_alloc_skb(unsigned int size)
{
struct sk_buff *skb;
unsigned int n;
/* alloc skb which should be big enough for a whole
* multipart message. WARNING: has to be <= 131000
* due to slab allocator restrictions */
n = max(size, nlbufsiz);
skb = alloc_skb(n, GFP_ATOMIC | __GFP_NOWARN);
if (!skb) {
if (n > size) {
/* try to allocate only as much as we need for
* current packet */
skb = alloc_skb(size, GFP_ATOMIC);
if (!skb)
pr_debug("cannot even allocate %ub\n", size);
}
}
return skb;
}
static void ipt_ulog_packet(unsigned int hooknum,
const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
const struct ipt_ulog_info *loginfo,
const char *prefix)
{
ulog_buff_t *ub;
ulog_packet_msg_t *pm;
size_t size, copy_len;
struct nlmsghdr *nlh;
struct timeval tv;
struct net *net = dev_net(in ? in : out);
struct ulog_net *ulog = ulog_pernet(net);
/* ffs == find first bit set, necessary because userspace
* is already shifting groupnumber, but we need unshifted.
* ffs() returns [1..32], we need [0..31] */
unsigned int groupnum = ffs(loginfo->nl_group) - 1;
/* calculate the size of the skb needed */
if (loginfo->copy_range == 0 || loginfo->copy_range > skb->len)
copy_len = skb->len;
else
copy_len = loginfo->copy_range;
size = nlmsg_total_size(sizeof(*pm) + copy_len);
ub = &ulog->ulog_buffers[groupnum];
spin_lock_bh(&ulog->lock);
if (!ub->skb) {
if (!(ub->skb = ulog_alloc_skb(size)))
goto alloc_failure;
} else if (ub->qlen >= loginfo->qthreshold ||
size > skb_tailroom(ub->skb)) {
/* either the queue len is too high or we don't have
* enough room in nlskb left. send it to userspace. */
ulog_send(ulog, groupnum);
if (!(ub->skb = ulog_alloc_skb(size)))
goto alloc_failure;
}
pr_debug("qlen %d, qthreshold %Zu\n", ub->qlen, loginfo->qthreshold);
nlh = nlmsg_put(ub->skb, 0, ub->qlen, ULOG_NL_EVENT,
sizeof(*pm)+copy_len, 0);
if (!nlh) {
pr_debug("error during nlmsg_put\n");
goto out_unlock;
}
ub->qlen++;
pm = nlmsg_data(nlh);
/* We might not have a timestamp, get one */
if (skb->tstamp.tv64 == 0)
__net_timestamp((struct sk_buff *)skb);
/* copy hook, prefix, timestamp, payload, etc. */
pm->data_len = copy_len;
tv = ktime_to_timeval(skb->tstamp);
put_unaligned(tv.tv_sec, &pm->timestamp_sec);
put_unaligned(tv.tv_usec, &pm->timestamp_usec);
put_unaligned(skb->mark, &pm->mark);
pm->hook = hooknum;
if (prefix != NULL)
strncpy(pm->prefix, prefix, sizeof(pm->prefix));
else if (loginfo->prefix[0] != '\0')
strncpy(pm->prefix, loginfo->prefix, sizeof(pm->prefix));
else
*(pm->prefix) = '\0';
if (in && in->hard_header_len > 0 &&
skb->mac_header != skb->network_header &&
in->hard_header_len <= ULOG_MAC_LEN) {
memcpy(pm->mac, skb_mac_header(skb), in->hard_header_len);
pm->mac_len = in->hard_header_len;
} else
pm->mac_len = 0
|