netfilter: ipt_ULOG: add net namespace support for ipt_ULOG
Add pernet support to ipt_ULOG by means of the new nf_log_set
function added in (30e0c6a
netfilter: nf_log: prepare net
namespace support for loggers).
This patch also make ulog_buffers and netlink socket
nflognl per netns.
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
parent
5b175b7ebd
commit
355430671a
@ -45,6 +45,7 @@
|
||||
#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>
|
||||
@ -78,15 +79,23 @@ typedef struct {
|
||||
struct timer_list timer; /* the timer function */
|
||||
} ulog_buff_t;
|
||||
|
||||
static ulog_buff_t ulog_buffers[ULOG_MAXNLGROUPS]; /* array of buffers */
|
||||
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 sock *nflognl; /* our socket */
|
||||
static DEFINE_SPINLOCK(ulog_lock); /* spinlock */
|
||||
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(unsigned int nlgroupnum)
|
||||
static void ulog_send(struct ulog_net *ulog, unsigned int nlgroupnum)
|
||||
{
|
||||
ulog_buff_t *ub = &ulog_buffers[nlgroupnum];
|
||||
ulog_buff_t *ub = &ulog->ulog_buffers[nlgroupnum];
|
||||
|
||||
pr_debug("ulog_send: timer is deleting\n");
|
||||
del_timer(&ub->timer);
|
||||
@ -103,7 +112,8 @@ static void ulog_send(unsigned int nlgroupnum)
|
||||
NETLINK_CB(ub->skb).dst_group = nlgroupnum + 1;
|
||||
pr_debug("throwing %d packets to netlink group %u\n",
|
||||
ub->qlen, nlgroupnum + 1);
|
||||
netlink_broadcast(nflognl, ub->skb, 0, nlgroupnum + 1, GFP_ATOMIC);
|
||||
netlink_broadcast(ulog->nflognl, ub->skb, 0, nlgroupnum + 1,
|
||||
GFP_ATOMIC);
|
||||
|
||||
ub->qlen = 0;
|
||||
ub->skb = NULL;
|
||||
@ -114,13 +124,16 @@ static void ulog_send(unsigned int nlgroupnum)
|
||||
/* 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(data);
|
||||
spin_unlock_bh(&ulog_lock);
|
||||
spin_lock_bh(&ulog->lock);
|
||||
ulog_send(ulog, data);
|
||||
spin_unlock_bh(&ulog->lock);
|
||||
}
|
||||
|
||||
static struct sk_buff *ulog_alloc_skb(unsigned int size)
|
||||
@ -160,6 +173,8 @@ static void ipt_ulog_packet(unsigned int hooknum,
|
||||
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.
|
||||
@ -174,9 +189,9 @@ static void ipt_ulog_packet(unsigned int hooknum,
|
||||
|
||||
size = NLMSG_SPACE(sizeof(*pm) + copy_len);
|
||||
|
||||
ub = &ulog_buffers[groupnum];
|
||||
ub = &ulog->ulog_buffers[groupnum];
|
||||
|
||||
spin_lock_bh(&ulog_lock);
|
||||
spin_lock_bh(&ulog->lock);
|
||||
|
||||
if (!ub->skb) {
|
||||
if (!(ub->skb = ulog_alloc_skb(size)))
|
||||
@ -186,7 +201,7 @@ static void ipt_ulog_packet(unsigned int hooknum,
|
||||
/* either the queue len is too high or we don't have
|
||||
* enough room in nlskb left. send it to userspace. */
|
||||
|
||||
ulog_send(groupnum);
|
||||
ulog_send(ulog, groupnum);
|
||||
|
||||
if (!(ub->skb = ulog_alloc_skb(size)))
|
||||
goto alloc_failure;
|
||||
@ -260,16 +275,16 @@ static void ipt_ulog_packet(unsigned int hooknum,
|
||||
if (ub->qlen >= loginfo->qthreshold) {
|
||||
if (loginfo->qthreshold > 1)
|
||||
nlh->nlmsg_type = NLMSG_DONE;
|
||||
ulog_send(groupnum);
|
||||
ulog_send(ulog, groupnum);
|
||||
}
|
||||
out_unlock:
|
||||
spin_unlock_bh(&ulog_lock);
|
||||
spin_unlock_bh(&ulog->lock);
|
||||
|
||||
return;
|
||||
|
||||
alloc_failure:
|
||||
pr_debug("Error building netlink message\n");
|
||||
spin_unlock_bh(&ulog_lock);
|
||||
spin_unlock_bh(&ulog->lock);
|
||||
}
|
||||
|
||||
static unsigned int
|
||||
@ -376,54 +391,43 @@ static struct nf_logger ipt_ulog_logger __read_mostly = {
|
||||
.me = THIS_MODULE,
|
||||
};
|
||||
|
||||
static int __init ulog_tg_init(void)
|
||||
static int __net_init ulog_tg_net_init(struct net *net)
|
||||
{
|
||||
int ret, i;
|
||||
int i;
|
||||
struct ulog_net *ulog = ulog_pernet(net);
|
||||
struct netlink_kernel_cfg cfg = {
|
||||
.groups = ULOG_MAXNLGROUPS,
|
||||
};
|
||||
|
||||
pr_debug("init module\n");
|
||||
|
||||
if (nlbufsiz > 128*1024) {
|
||||
pr_warning("Netlink buffer has to be <= 128kB\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
spin_lock_init(&ulog->lock);
|
||||
/* initialize ulog_buffers */
|
||||
for (i = 0; i < ULOG_MAXNLGROUPS; i++)
|
||||
setup_timer(&ulog_buffers[i].timer, ulog_timer, i);
|
||||
setup_timer(&ulog->ulog_buffers[i].timer, ulog_timer, i);
|
||||
|
||||
nflognl = netlink_kernel_create(&init_net, NETLINK_NFLOG, &cfg);
|
||||
if (!nflognl)
|
||||
ulog->nflognl = netlink_kernel_create(net, NETLINK_NFLOG, &cfg);
|
||||
if (!ulog->nflognl)
|
||||
return -ENOMEM;
|
||||
|
||||
ret = xt_register_target(&ulog_tg_reg);
|
||||
if (ret < 0) {
|
||||
netlink_kernel_release(nflognl);
|
||||
return ret;
|
||||
}
|
||||
if (nflog)
|
||||
nf_log_register(NFPROTO_IPV4, &ipt_ulog_logger);
|
||||
nf_log_set(net, NFPROTO_IPV4, &ipt_ulog_logger);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit ulog_tg_exit(void)
|
||||
static void __net_exit ulog_tg_net_exit(struct net *net)
|
||||
{
|
||||
ulog_buff_t *ub;
|
||||
int i;
|
||||
|
||||
pr_debug("cleanup_module\n");
|
||||
struct ulog_net *ulog = ulog_pernet(net);
|
||||
|
||||
if (nflog)
|
||||
nf_log_unregister(&ipt_ulog_logger);
|
||||
xt_unregister_target(&ulog_tg_reg);
|
||||
netlink_kernel_release(nflognl);
|
||||
nf_log_unset(net, &ipt_ulog_logger);
|
||||
|
||||
netlink_kernel_release(ulog->nflognl);
|
||||
|
||||
/* remove pending timers and free allocated skb's */
|
||||
for (i = 0; i < ULOG_MAXNLGROUPS; i++) {
|
||||
ub = &ulog_buffers[i];
|
||||
ub = &ulog->ulog_buffers[i];
|
||||
pr_debug("timer is deleting\n");
|
||||
del_timer(&ub->timer);
|
||||
|
||||
@ -434,5 +438,50 @@ static void __exit ulog_tg_exit(void)
|
||||
}
|
||||
}
|
||||
|
||||
static struct pernet_operations ulog_tg_net_ops = {
|
||||
.init = ulog_tg_net_init,
|
||||
.exit = ulog_tg_net_exit,
|
||||
.id = &ulog_net_id,
|
||||
.size = sizeof(struct ulog_net),
|
||||
};
|
||||
|
||||
static int __init ulog_tg_init(void)
|
||||
{
|
||||
int ret;
|
||||
pr_debug("init module\n");
|
||||
|
||||
if (nlbufsiz > 128*1024) {
|
||||
pr_warn("Netlink buffer has to be <= 128kB\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
ret = register_pernet_subsys(&ulog_tg_net_ops);
|
||||
if (ret)
|
||||
goto out_pernet;
|
||||
|
||||
ret = xt_register_target(&ulog_tg_reg);
|
||||
if (ret < 0)
|
||||
goto out_target;
|
||||
|
||||
if (nflog)
|
||||
nf_log_register(NFPROTO_IPV4, &ipt_ulog_logger);
|
||||
|
||||
return 0;
|
||||
|
||||
out_target:
|
||||
unregister_pernet_subsys(&ulog_tg_net_ops);
|
||||
out_pernet:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void __exit ulog_tg_exit(void)
|
||||
{
|
||||
pr_debug("cleanup_module\n");
|
||||
if (nflog)
|
||||
nf_log_unregister(&ipt_ulog_logger);
|
||||
xt_unregister_target(&ulog_tg_reg);
|
||||
unregister_pernet_subsys(&ulog_tg_net_ops);
|
||||
}
|
||||
|
||||
module_init(ulog_tg_init);
|
||||
module_exit(ulog_tg_exit);
|
||||
|
Loading…
Reference in New Issue
Block a user