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:
Gao feng
Pablo Neira Ayuso
parent
5b175b7ebd
commit
355430671a
1 changed files with 89 additions and 40 deletions
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@ -45,6 +45,7 @@
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter_ipv4/ipt_ULOG.h>
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#include <net/netfilter/nf_log.h>
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#include <net/netns/generic.h>
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#include <net/sock.h>
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#include <linux/bitops.h>
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#include <asm/unaligned.h>
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@ -78,15 +79,23 @@ typedef struct {
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struct timer_list timer; /* the timer function */
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} ulog_buff_t;
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static ulog_buff_t ulog_buffers[ULOG_MAXNLGROUPS]; /* array of buffers */
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static int ulog_net_id __read_mostly;
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struct ulog_net {
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unsigned int nlgroup[ULOG_MAXNLGROUPS];
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ulog_buff_t ulog_buffers[ULOG_MAXNLGROUPS];
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struct sock *nflognl;
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spinlock_t lock;
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};
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static struct sock *nflognl; /* our socket */
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static DEFINE_SPINLOCK(ulog_lock); /* spinlock */
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static struct ulog_net *ulog_pernet(struct net *net)
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{
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return net_generic(net, ulog_net_id);
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}
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/* send one ulog_buff_t to userspace */
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static void ulog_send(unsigned int nlgroupnum)
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static void ulog_send(struct ulog_net *ulog, unsigned int nlgroupnum)
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{
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ulog_buff_t *ub = &ulog_buffers[nlgroupnum];
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ulog_buff_t *ub = &ulog->ulog_buffers[nlgroupnum];
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pr_debug("ulog_send: timer is deleting\n");
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del_timer(&ub->timer);
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@ -103,7 +112,8 @@ static void ulog_send(unsigned int nlgroupnum)
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NETLINK_CB(ub->skb).dst_group = nlgroupnum + 1;
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pr_debug("throwing %d packets to netlink group %u\n",
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ub->qlen, nlgroupnum + 1);
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netlink_broadcast(nflognl, ub->skb, 0, nlgroupnum + 1, GFP_ATOMIC);
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netlink_broadcast(ulog->nflognl, ub->skb, 0, nlgroupnum + 1,
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GFP_ATOMIC);
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ub->qlen = 0;
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ub->skb = NULL;
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@ -114,13 +124,16 @@ static void ulog_send(unsigned int nlgroupnum)
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/* timer function to flush queue in flushtimeout time */
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static void ulog_timer(unsigned long data)
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{
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struct ulog_net *ulog = container_of((void *)data,
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struct ulog_net,
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nlgroup[*(unsigned int *)data]);
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pr_debug("timer function called, calling ulog_send\n");
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/* lock to protect against somebody modifying our structure
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* from ipt_ulog_target at the same time */
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spin_lock_bh(&ulog_lock);
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ulog_send(data);
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spin_unlock_bh(&ulog_lock);
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spin_lock_bh(&ulog->lock);
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ulog_send(ulog, data);
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spin_unlock_bh(&ulog->lock);
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}
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static struct sk_buff *ulog_alloc_skb(unsigned int size)
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@ -160,6 +173,8 @@ static void ipt_ulog_packet(unsigned int hooknum,
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size_t size, copy_len;
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struct nlmsghdr *nlh;
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struct timeval tv;
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struct net *net = dev_net(in ? in : out);
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struct ulog_net *ulog = ulog_pernet(net);
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/* ffs == find first bit set, necessary because userspace
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* is already shifting groupnumber, but we need unshifted.
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@ -174,9 +189,9 @@ static void ipt_ulog_packet(unsigned int hooknum,
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size = NLMSG_SPACE(sizeof(*pm) + copy_len);
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ub = &ulog_buffers[groupnum];
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ub = &ulog->ulog_buffers[groupnum];
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spin_lock_bh(&ulog_lock);
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spin_lock_bh(&ulog->lock);
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if (!ub->skb) {
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if (!(ub->skb = ulog_alloc_skb(size)))
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@ -186,7 +201,7 @@ static void ipt_ulog_packet(unsigned int hooknum,
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/* either the queue len is too high or we don't have
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* enough room in nlskb left. send it to userspace. */
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ulog_send(groupnum);
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ulog_send(ulog, groupnum);
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if (!(ub->skb = ulog_alloc_skb(size)))
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goto alloc_failure;
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@ -260,16 +275,16 @@ static void ipt_ulog_packet(unsigned int hooknum,
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if (ub->qlen >= loginfo->qthreshold) {
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if (loginfo->qthreshold > 1)
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nlh->nlmsg_type = NLMSG_DONE;
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ulog_send(groupnum);
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ulog_send(ulog, groupnum);
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}
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out_unlock:
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spin_unlock_bh(&ulog_lock);
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spin_unlock_bh(&ulog->lock);
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return;
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alloc_failure:
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pr_debug("Error building netlink message\n");
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spin_unlock_bh(&ulog_lock);
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spin_unlock_bh(&ulog->lock);
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}
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static unsigned int
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@ -376,54 +391,43 @@ static struct nf_logger ipt_ulog_logger __read_mostly = {
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.me = THIS_MODULE,
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};
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static int __init ulog_tg_init(void)
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static int __net_init ulog_tg_net_init(struct net *net)
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{
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int ret, i;
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int i;
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struct ulog_net *ulog = ulog_pernet(net);
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struct netlink_kernel_cfg cfg = {
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.groups = ULOG_MAXNLGROUPS,
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};
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pr_debug("init module\n");
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if (nlbufsiz > 128*1024) {
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pr_warning("Netlink buffer has to be <= 128kB\n");
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return -EINVAL;
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}
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spin_lock_init(&ulog->lock);
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/* initialize ulog_buffers */
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for (i = 0; i < ULOG_MAXNLGROUPS; i++)
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setup_timer(&ulog_buffers[i].timer, ulog_timer, i);
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setup_timer(&ulog->ulog_buffers[i].timer, ulog_timer, i);
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nflognl = netlink_kernel_create(&init_net, NETLINK_NFLOG, &cfg);
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if (!nflognl)
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ulog->nflognl = netlink_kernel_create(net, NETLINK_NFLOG, &cfg);
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if (!ulog->nflognl)
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return -ENOMEM;
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ret = xt_register_target(&ulog_tg_reg);
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if (ret < 0) {
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netlink_kernel_release(nflognl);
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return ret;
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}
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if (nflog)
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nf_log_register(NFPROTO_IPV4, &ipt_ulog_logger);
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nf_log_set(net, NFPROTO_IPV4, &ipt_ulog_logger);
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return 0;
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}
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static void __exit ulog_tg_exit(void)
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static void __net_exit ulog_tg_net_exit(struct net *net)
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{
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ulog_buff_t *ub;
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int i;
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pr_debug("cleanup_module\n");
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struct ulog_net *ulog = ulog_pernet(net);
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if (nflog)
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nf_log_unregister(&ipt_ulog_logger);
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xt_unregister_target(&ulog_tg_reg);
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netlink_kernel_release(nflognl);
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nf_log_unset(net, &ipt_ulog_logger);
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netlink_kernel_release(ulog->nflognl);
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/* remove pending timers and free allocated skb's */
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for (i = 0; i < ULOG_MAXNLGROUPS; i++) {
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ub = &ulog_buffers[i];
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ub = &ulog->ulog_buffers[i];
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pr_debug("timer is deleting\n");
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del_timer(&ub->timer);
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@ -434,5 +438,50 @@ static void __exit ulog_tg_exit(void)
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}
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}
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static struct pernet_operations ulog_tg_net_ops = {
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.init = ulog_tg_net_init,
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.exit = ulog_tg_net_exit,
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.id = &ulog_net_id,
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.size = sizeof(struct ulog_net),
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};
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static int __init ulog_tg_init(void)
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{
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int ret;
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pr_debug("init module\n");
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if (nlbufsiz > 128*1024) {
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pr_warn("Netlink buffer has to be <= 128kB\n");
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return -EINVAL;
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}
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ret = register_pernet_subsys(&ulog_tg_net_ops);
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if (ret)
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goto out_pernet;
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ret = xt_register_target(&ulog_tg_reg);
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if (ret < 0)
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goto out_target;
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if (nflog)
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nf_log_register(NFPROTO_IPV4, &ipt_ulog_logger);
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return 0;
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out_target:
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unregister_pernet_subsys(&ulog_tg_net_ops);
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out_pernet:
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return ret;
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}
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static void __exit ulog_tg_exit(void)
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{
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pr_debug("cleanup_module\n");
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if (nflog)
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nf_log_unregister(&ipt_ulog_logger);
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xt_unregister_target(&ulog_tg_reg);
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unregister_pernet_subsys(&ulog_tg_net_ops);
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}
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module_init(ulog_tg_init);
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module_exit(ulog_tg_exit);
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