patch-2.3.99-pre2 linux/net/ipv4/netfilter/ip_queue.c
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- Lines: 753
- Date:
Fri Mar 17 10:56:20 2000
- Orig file:
v2.3.99-pre1/linux/net/ipv4/netfilter/ip_queue.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.3.99-pre1/linux/net/ipv4/netfilter/ip_queue.c linux/net/ipv4/netfilter/ip_queue.c
@@ -0,0 +1,752 @@
+/*
+ * This is a module which is used for queueing IPv4 packets and
+ * communicating with userspace via netlink.
+ *
+ * (C) 2000 James Morris
+ */
+#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/netlink.h>
+#include <linux/spinlock.h>
+#include <linux/smp_lock.h>
+#include <linux/rtnetlink.h>
+#include <linux/sysctl.h>
+#include <linux/proc_fs.h>
+#include <net/sock.h>
+
+#include <linux/netfilter_ipv4/ip_queue.h>
+
+EXPORT_NO_SYMBOLS;
+
+#define IPQ_THR_NAME "kipq"
+#define IPQ_NAME "ip_queue"
+#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 struct ipq_queue_element {
+ struct list_head list; /* Links element into queue */
+ unsigned char state; /* State of this element */
+ int verdict; /* Current verdict */
+ struct nf_info *info; /* Extra info from netfilter */
+ struct sk_buff *skb; /* Packet inside */
+} ipq_queue_element_t;
+
+typedef int (*ipq_send_cb_t)(ipq_queue_element_t *e);
+
+typedef struct ipq_peer {
+ pid_t pid; /* PID of userland peer */
+ unsigned char died; /* We think the peer died */
+ unsigned char copy_mode; /* Copy packet as well as metadata? */
+ size_t copy_range; /* Range past metadata to copy */
+ ipq_send_cb_t send; /* Callback for sending data to peer */
+} ipq_peer_t;
+
+typedef struct ipq_thread {
+ pid_t pid; /* PID of kernel thread */
+ unsigned char terminate; /* Termination flag */
+ unsigned char running; /* Running flag */
+ wait_queue_head_t wq; /* I/O wait queue */
+ void (*process)(void *data); /* Queue processing function */
+} ipq_thread_t;
+
+typedef struct ipq_queue {
+ int len; /* Current queue len */
+ int *maxlen; /* Maximum queue len, via sysctl */
+ unsigned char state; /* Current queue state */
+ struct list_head list; /* Head of packet queue */
+ spinlock_t lock; /* Queue spinlock */
+ ipq_peer_t peer; /* Userland peer */
+ ipq_thread_t thread; /* Thread context */
+} ipq_queue_t;
+
+
+/****************************************************************************
+*
+* Kernel thread
+*
+****************************************************************************/
+
+static void ipq_thread_init(char *thread_name)
+{
+ lock_kernel();
+ exit_files(current);
+ daemonize();
+ strcpy(current->comm, thread_name);
+ unlock_kernel();
+ spin_lock_irq(¤t->sigmask_lock);
+ flush_signals(current);
+ sigfillset(¤t->blocked);
+ recalc_sigpending(current);
+ spin_unlock_irq(¤t->sigmask_lock);
+}
+
+static int ipq_thread_start(void *data)
+{
+ ipq_queue_t *q = (ipq_queue_t *)data;
+
+ q->thread.running = 1;
+ ipq_thread_init(IPQ_THR_NAME);
+ q->thread.pid = current->pid;
+ while (!q->thread.terminate) {
+ interruptible_sleep_on(&q->thread.wq);
+ q->thread.process(q);
+ }
+ q->thread.running = 0;
+ return 0;
+}
+
+static void ipq_thread_stop(ipq_queue_t *q)
+{
+ if (!(q->thread.pid || q->thread.running))
+ return;
+ q->state = IPQ_QS_FLUSH;
+ q->thread.terminate = 1;
+ wake_up_interruptible(&q->thread.wq);
+ current->state = TASK_INTERRUPTIBLE;
+ while (q->thread.running) {
+ schedule_timeout(HZ/10);
+ current->state = TASK_RUNNING;
+ }
+}
+
+static int ipq_thread_create(ipq_queue_t *q)
+{
+ int status = kernel_thread(ipq_thread_start, q, 0);
+ return (status < 0) ? status : 0;
+}
+
+
+/****************************************************************************
+ *
+ * Packet queue
+ *
+ ****************************************************************************/
+
+/* Must be called under spinlock */
+static __inline__ void
+ipq_dequeue(ipq_queue_t *q,
+ ipq_queue_element_t *e)
+{
+ list_del(&e->list);
+ nf_reinject(e->skb, e->info, e->verdict);
+ kfree(e);
+ q->len--;
+}
+
+/* Must be called under spinlock */
+static __inline__ void
+ipq_queue_drop(ipq_queue_t *q,
+ ipq_queue_element_t *e)
+{
+ e->verdict = NF_DROP;
+ ipq_dequeue(q, e);
+}
+
+static int
+ipq_notify_peer(ipq_queue_t *q,
+ ipq_queue_element_t *e)
+{
+ int status = q->peer.send(e);
+
+ if (status >= 0) {
+ e->state = IPQ_PS_WAITING;
+ return status;
+ }
+ if (status == -ERESTARTSYS || status == -EAGAIN)
+ return 0;
+ printk(KERN_INFO "%s: error notifying peer %d, resetting "
+ "state and flushing queue\n", IPQ_NAME, q->peer.pid);
+ q->state = IPQ_QS_FLUSH;
+ q->peer.died = 1;
+ q->peer.pid = 0;
+ q->peer.copy_mode = IPQ_COPY_META;
+ q->peer.copy_range = 0;
+ return status;
+}
+
+static void
+ipq_queue_process(void *data)
+{
+ struct list_head *i;
+ ipq_queue_t *q = (ipq_queue_t *)data;
+
+restart:
+ if (q->state == IPQ_QS_HOLD)
+ return;
+ spin_lock_bh(&q->lock);
+ for (i = q->list.prev; i != &q->list; i = i->prev) {
+ ipq_queue_element_t *e = (ipq_queue_element_t *)i;
+
+ if (q->state == IPQ_QS_FLUSH) {
+ QDEBUG("flushing packet %p\n", e);
+ ipq_queue_drop(q, e);
+ continue;
+ }
+ switch (e->state) {
+ case IPQ_PS_NEW: {
+ int status = ipq_notify_peer(q, e);
+ if (status < 0) {
+ spin_unlock_bh(&q->lock);
+ goto restart;
+ }
+ break;
+ }
+ case IPQ_PS_VERDICT:
+ ipq_dequeue(q, e);
+ break;
+ case IPQ_PS_WAITING:
+ break;
+ default:
+ printk(KERN_INFO "%s: dropping stuck packet %p "
+ "with ps=%d qs=%d\n", IPQ_NAME,
+ e, e->state, q->state);
+ ipq_queue_drop(q, e);
+ }
+ }
+ spin_unlock_bh(&q->lock);
+ if (q->state == IPQ_QS_FLUSH)
+ q->state = IPQ_QS_HOLD;
+}
+
+static ipq_queue_t *
+ipq_queue_create(nf_queue_outfn_t outfn,
+ ipq_send_cb_t send_cb,
+ int *errp,
+ int *sysctl_qmax)
+{
+ int status;
+ ipq_queue_t *q;
+
+ *errp = 0;
+ q = kmalloc(sizeof(ipq_queue_t), GFP_KERNEL);
+ if (q == NULL) {
+ *errp = -ENOMEM;
+ return NULL;
+ }
+ q->thread.terminate = 0;
+ q->thread.running = 0;
+ q->thread.process = ipq_queue_process;
+ init_waitqueue_head(&q->thread.wq);
+ q->peer.pid = 0;
+ q->peer.died = 0;
+ q->peer.copy_mode = IPQ_COPY_META;
+ q->peer.copy_range = 0;
+ q->peer.send = send_cb;
+ q->len = 0;
+ q->maxlen = sysctl_qmax;
+ q->state = IPQ_QS_HOLD;
+ INIT_LIST_HEAD(&q->list);
+ spin_lock_init(&q->lock);
+ status = nf_register_queue_handler(PF_INET, outfn, q);
+ if (status < 0) {
+ *errp = -EBUSY;
+ kfree(q);
+ return NULL;
+ }
+ status = ipq_thread_create(q);
+ if (status < 0) {
+ nf_unregister_queue_handler(PF_INET);
+ *errp = status;
+ kfree(q);
+ return NULL;
+ }
+ return q;
+}
+
+static int
+ipq_enqueue(ipq_queue_t *q,
+ struct sk_buff *skb,
+ struct nf_info *info)
+{
+ ipq_queue_element_t *e = NULL;
+
+ e = kmalloc(sizeof(*e), GFP_ATOMIC);
+ if (e == NULL) {
+ printk(KERN_ERR "%s: out of memory in %s\n",
+ IPQ_NAME, __FUNCTION__);
+ return -ENOMEM;
+ }
+ e->state = IPQ_PS_NEW;
+ e->verdict = NF_DROP;
+ e->info = info;
+ e->skb = skb;
+ spin_lock_bh(&q->lock);
+ if (q->len >= *q->maxlen) {
+ spin_unlock_bh(&q->lock);
+ printk(KERN_WARNING "%s: queue full at %d entries, "
+ "dropping packet.\n", IPQ_NAME, q->len);
+ kfree(e);
+ nf_reinject(skb, info, NF_DROP);
+ return 0;
+ }
+ list_add(&e->list, &q->list);
+ q->len++;
+ spin_unlock_bh(&q->lock);
+ wake_up_interruptible(&q->thread.wq);
+ return 0;
+}
+
+/* FIXME: need to find a way to notify user during module unload */
+static void
+ipq_queue_destroy(ipq_queue_t *q)
+{
+ ipq_thread_stop(q);
+ nf_unregister_queue_handler(PF_INET);
+ kfree(q);
+}
+
+static int
+ipq_queue_mangle_ipv4(unsigned char *buf,
+ ipq_verdict_msg_t *v,
+ ipq_queue_element_t *e)
+{
+ struct iphdr *user_iph = (struct iphdr *)buf;
+
+ if (v->data_len < sizeof(*user_iph))
+ return 0;
+
+ if (e->skb->nh.iph->check != user_iph->check) {
+ int diff = v->data_len - e->skb->len;
+
+ if (diff < 0)
+ skb_trim(e->skb, v->data_len);
+ else if (diff > 0) {
+ if (v->data_len > 0xFFFF) {
+ e->verdict = NF_DROP;
+ return -EINVAL;
+ }
+ if (diff > skb_tailroom(e->skb)) {
+ struct sk_buff *newskb;
+
+ /* Ack, we waste a memcpy() of data here */
+ newskb = skb_copy_expand(e->skb,
+ skb_headroom(e->skb),
+ diff,
+ GFP_ATOMIC);
+ if (newskb == NULL) {
+ printk(KERN_WARNING "%s: OOM in %s, "
+ "dropping packet\n",
+ IPQ_THR_NAME, __FUNCTION__);
+ e->verdict = NF_DROP;
+ return -ENOMEM;
+ }
+ kfree_skb(e->skb);
+ e->skb = newskb;
+ }
+ skb_put(e->skb, diff);
+ }
+ memcpy(e->skb->data, buf, v->data_len);
+ e->skb->nfcache |= NFC_ALTERED;
+ }
+ return 0;
+}
+
+static int
+ipq_queue_set_verdict(ipq_queue_t *q,
+ ipq_verdict_msg_t *v,
+ unsigned char *buf,
+ unsigned int len)
+{
+ struct list_head *i;
+
+ if (v->value < 0 || v->value > NF_MAX_VERDICT)
+ return -EINVAL;
+ spin_lock_bh(&q->lock);
+ for (i = q->list.next; i != &q->list; i = i->next) {
+ ipq_queue_element_t *e = (ipq_queue_element_t *)i;
+
+ if (v->id == (unsigned long )e) {
+ int status = 0;
+ e->state = IPQ_PS_VERDICT;
+ e->verdict = v->value;
+
+ if (buf && v->data_len == len)
+ status = ipq_queue_mangle_ipv4(buf, v, e);
+ spin_unlock_bh(&q->lock);
+ return status;
+ }
+ }
+ spin_unlock_bh(&q->lock);
+ return -ENOENT;
+}
+
+static int
+ipq_receive_peer(ipq_queue_t *q,
+ ipq_peer_msg_t *m,
+ unsigned char type,
+ unsigned int len)
+{
+ if (q->state == IPQ_QS_FLUSH)
+ return -EBUSY;
+
+ if (len < sizeof(ipq_peer_msg_t))
+ return -EINVAL;
+
+ switch (type) {
+ case IPQM_MODE:
+ switch (m->msg.mode.value) {
+ case IPQ_COPY_NONE:
+ q->peer.copy_mode = IPQ_COPY_NONE;
+ q->peer.copy_range = 0;
+ q->state = IPQ_QS_FLUSH;
+ break;
+ case IPQ_COPY_META:
+ if (q->state == IPQ_QS_FLUSH)
+ return -EAGAIN;
+ q->peer.copy_mode = IPQ_COPY_META;
+ q->peer.copy_range = 0;
+ q->state = IPQ_QS_COPY;
+ break;
+ case IPQ_COPY_PACKET:
+ if (q->state == IPQ_QS_FLUSH)
+ return -EAGAIN;
+ q->peer.copy_mode = IPQ_COPY_PACKET;
+ q->peer.copy_range = m->msg.mode.range;
+ q->state = IPQ_QS_COPY;
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
+ case IPQM_VERDICT: {
+ int status;
+ unsigned char *data = NULL;
+
+ if (m->msg.verdict.value > NF_MAX_VERDICT)
+ return -EINVAL;
+ if (m->msg.verdict.data_len)
+ data = (unsigned char *)m + sizeof(*m);
+ status = ipq_queue_set_verdict(q, &m->msg.verdict,
+ data, len - sizeof(*m));
+ if (status < 0)
+ return status;
+ break;
+ }
+ default:
+ return -EINVAL;
+ }
+ wake_up_interruptible(&q->thread.wq);
+ return 0;
+}
+
+
+/****************************************************************************
+ *
+ * Netfilter interface
+ *
+ ****************************************************************************/
+
+/*
+ * Packets arrive here from netfilter for queuing to userspace.
+ * All of them must be fed back via nf_reinject() or Alexey will kill Rusty.
+ */
+static int
+receive_netfilter(struct sk_buff *skb,
+ struct nf_info *info,
+ void *data)
+{
+ ipq_queue_t *q = (ipq_queue_t *)data;
+
+ if (q->state == IPQ_QS_FLUSH)
+ return -EBUSY;
+ return ipq_enqueue(q, skb, info);
+}
+
+/****************************************************************************
+ *
+ * Netlink interface.
+ *
+ ****************************************************************************/
+
+static struct sk_buff *
+netlink_build_message(ipq_queue_element_t *e,
+ int *errp);
+
+extern __inline__ void
+receive_user_skb(struct sk_buff *skb);
+
+static int
+netlink_send_peer(ipq_queue_element_t *e);
+
+static struct sock *nfnl = NULL;
+ipq_queue_t *nlq = NULL;
+
+static int
+netlink_send_peer(ipq_queue_element_t *e)
+{
+ int status = 0;
+ struct sk_buff *skb;
+
+ if (!nlq->peer.pid)
+ return -EINVAL;
+ skb = netlink_build_message(e, &status);
+ if (skb == NULL)
+ return status;
+ return netlink_unicast(nfnl, skb, nlq->peer.pid, 0);
+}
+
+static struct sk_buff *
+netlink_build_message(ipq_queue_element_t *e,
+ int *errp)
+{
+ unsigned char *old_tail;
+ size_t size = 0;
+ size_t data_len = 0;
+ struct sk_buff *skb;
+ ipq_packet_msg_t *pm;
+ struct nlmsghdr *nlh;
+
+ switch (nlq->peer.copy_mode) {
+ size_t copy_range;
+
+ case IPQ_COPY_META:
+ size = NLMSG_SPACE(sizeof(*pm));
+ data_len = 0;
+ break;
+ case IPQ_COPY_PACKET:
+ copy_range = nlq->peer.copy_range;
+ if (copy_range == 0 || copy_range > e->skb->len)
+ data_len = e->skb->len;
+ else
+ data_len = copy_range;
+ size = NLMSG_SPACE(sizeof(*pm) + data_len);
+ break;
+ case IPQ_COPY_NONE:
+ 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));
+ pm = NLMSG_DATA(nlh);
+ memset(pm, 0, sizeof(*pm));
+ pm->packet_id = (unsigned long )e;
+ pm->data_len = data_len;
+ pm->timestamp_sec = e->skb->stamp.tv_sec;
+ pm->timestamp_usec = e->skb->stamp.tv_usec;
+ pm->hook = e->info->hook;
+ if (e->info->indev) strcpy(pm->indev_name, e->info->indev->name);
+ else pm->indev_name[0] = '\0';
+ if (e->info->outdev) strcpy(pm->outdev_name, e->info->outdev->name);
+ else pm->outdev_name[0] = '\0';
+ if (data_len)
+ memcpy(++pm, e->skb->data, data_len);
+ nlh->nlmsg_len = skb->tail - old_tail;
+ NETLINK_CB(skb).dst_groups = 0;
+ return skb;
+nlmsg_failure:
+ if (skb)
+ kfree(skb);
+ *errp = 0;
+ printk(KERN_ERR "%s: error creating netlink message\n", IPQ_NAME);
+ return NULL;
+}
+
+#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0);
+/*
+ * FIXME: ping old peer if we detect a new peer then resend.
+ */
+extern __inline__ void
+receive_user_skb(struct sk_buff *skb)
+{
+ int status, type;
+ struct nlmsghdr *nlh;
+
+ nlh = (struct nlmsghdr *)skb->data;
+ if (nlh->nlmsg_len < sizeof(*nlh)
+ || skb->len < nlh->nlmsg_len
+ || nlh->nlmsg_pid <= 0
+ || !(nlh->nlmsg_flags & NLM_F_REQUEST)
+ || nlh->nlmsg_flags & NLM_F_MULTI)
+ RCV_SKB_FAIL(-EINVAL);
+ if (nlh->nlmsg_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(!cap_raised(NETLINK_CB(skb).eff_cap, CAP_NET_ADMIN))
+ RCV_SKB_FAIL(-EPERM);
+ if (nlq->peer.pid && !nlq->peer.died
+ && (nlq->peer.pid != nlh->nlmsg_pid))
+ printk(KERN_WARNING "%s: peer pid changed from %d to %d\n",
+ IPQ_NAME, nlq->peer.pid, nlh->nlmsg_pid);
+ nlq->peer.pid = nlh->nlmsg_pid;
+ nlq->peer.died = 0;
+ status = ipq_receive_peer(nlq, NLMSG_DATA(nlh),
+ type, skb->len - NLMSG_LENGTH(0));
+ if (status < 0)
+ RCV_SKB_FAIL(status);
+ if (nlh->nlmsg_flags & NLM_F_ACK)
+ netlink_ack(skb, nlh, 0);
+ return;
+}
+
+/* Note: we are only dealing with single part messages at the moment. */
+static void
+receive_user_sk(struct sock *sk,
+ int len)
+{
+ do {
+ struct sk_buff *skb;
+
+ if (rtnl_shlock_nowait())
+ return;
+ while ((skb = skb_dequeue(&sk->receive_queue)) != NULL) {
+ receive_user_skb(skb);
+ kfree_skb(skb);
+ }
+ up(&rtnl_sem);
+ } while (nfnl && nfnl->receive_queue.qlen);
+}
+
+
+/****************************************************************************
+ *
+ * System events
+ *
+ ****************************************************************************/
+
+static int
+receive_event(struct notifier_block *this,
+ unsigned long event,
+ void *ptr)
+{
+ if (event == NETDEV_UNREGISTER)
+ if (nlq)
+ ipq_thread_stop(nlq);
+ return NOTIFY_DONE;
+}
+
+struct notifier_block ipq_dev_notifier = {
+ receive_event,
+ NULL,
+ 0
+};
+
+
+/****************************************************************************
+ *
+ * Sysctl - queue tuning.
+ *
+ ****************************************************************************/
+
+static int sysctl_maxlen = IPQ_QMAX_DEFAULT;
+
+static struct ctl_table_header *ipq_sysctl_header;
+
+static ctl_table ipq_table[] = {
+ { NET_IPQ_QMAX, NET_IPQ_QMAX_NAME, &sysctl_maxlen,
+ sizeof(sysctl_maxlen), 0644, NULL, proc_dointvec },
+ { 0 }
+};
+
+static ctl_table ipq_dir_table[] = {
+ {NET_IPV4, "ipv4", NULL, 0, 0555, ipq_table, 0, 0, 0, 0, 0},
+ { 0 }
+};
+
+static ctl_table ipq_root_table[] = {
+ {CTL_NET, "net", NULL, 0, 0555, ipq_dir_table, 0, 0, 0, 0, 0},
+ { 0 }
+};
+
+/****************************************************************************
+ *
+ * Procfs - debugging info.
+ *
+ ****************************************************************************/
+
+static int
+ipq_get_info(char *buffer, char **start, off_t offset, int length)
+{
+ int len;
+
+ spin_lock_bh(&nlq->lock);
+ len = sprintf(buffer,
+ "Thread pid : %d\n"
+ "Thread terminate : %d\n"
+ "Thread running : %d\n"
+ "Peer pid : %d\n"
+ "Peer died : %d\n"
+ "Peer copy mode : %d\n"
+ "Peer copy range : %d\n"
+ "Queue length : %d\n"
+ "Queue max. length : %d\n"
+ "Queue state : %d\n",
+ nlq->thread.pid,
+ nlq->thread.terminate,
+ nlq->thread.running,
+ nlq->peer.pid,
+ nlq->peer.died,
+ nlq->peer.copy_mode,
+ nlq->peer.copy_range,
+ nlq->len,
+ *nlq->maxlen,
+ nlq->state);
+ spin_unlock_bh(&nlq->lock);
+ *start = buffer + offset;
+ len -= offset;
+ if (len > length)
+ len = length;
+ else if (len < 0)
+ len = 0;
+ return len;
+}
+
+/****************************************************************************
+ *
+ * Module stuff.
+ *
+ ****************************************************************************/
+
+static int __init init(void)
+{
+ int status = 0;
+
+ nfnl = netlink_kernel_create(NETLINK_FIREWALL, receive_user_sk);
+ if (nfnl == NULL) {
+ printk(KERN_ERR "%s: initialisation failed: unable to "
+ "create kernel netlink socket\n", IPQ_NAME);
+ return -ENOMEM;
+ }
+ nlq = ipq_queue_create(receive_netfilter,
+ netlink_send_peer, &status, &sysctl_maxlen);
+ if (nlq == NULL) {
+ printk(KERN_ERR "%s: initialisation failed: unable to "
+ "initialise queue\n", IPQ_NAME);
+ sock_release(nfnl->socket);
+ return status;
+ }
+ register_netdevice_notifier(&ipq_dev_notifier);
+ proc_net_create(IPQ_PROC_FS_NAME, 0, ipq_get_info);
+ ipq_sysctl_header = register_sysctl_table(ipq_root_table, 0);
+ return status;
+}
+
+static void __exit fini(void)
+{
+ unregister_sysctl_table(ipq_sysctl_header);
+ proc_net_remove(IPQ_PROC_FS_NAME);
+ unregister_netdevice_notifier(&ipq_dev_notifier);
+ ipq_queue_destroy(nlq);
+ sock_release(nfnl->socket);
+}
+
+MODULE_DESCRIPTION("IPv4 packet queue handler");
+module_init(init);
+module_exit(fini);
+
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)