--- /dev/null
+#ifndef _NET_NFNL_QUEUE_H_
+#define _NET_NFNL_QUEUE_H_
+
+#include <linux/netfilter/nf_conntrack_common.h>
+
+struct nf_conn;
+
+#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
+struct nf_conn *nfqnl_ct_get(struct sk_buff *entskb, size_t *size,
+ enum ip_conntrack_info *ctinfo);
+struct nf_conn *nfqnl_ct_parse(const struct sk_buff *skb,
+ const struct nlattr *attr,
+ enum ip_conntrack_info *ctinfo);
+int nfqnl_ct_put(struct sk_buff *skb, struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo);
+void nfqnl_ct_seq_adjust(struct sk_buff *skb, struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo, int diff);
+#else
+inline struct nf_conn *
+nfqnl_ct_get(struct sk_buff *entskb, size_t *size, enum ip_conntrack_info *ctinfo)
+{
+ return NULL;
+}
+
+inline struct nf_conn *nfqnl_ct_parse(const struct sk_buff *skb,
+ const struct nlattr *attr,
+ enum ip_conntrack_info *ctinfo)
+{
+ return NULL;
+}
+
+inline int
+nfqnl_ct_put(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo)
+{
+ return 0;
+}
+
+inline void nfqnl_ct_seq_adjust(struct sk_buff *skb, struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo, int diff)
+{
+}
+#endif /* NF_CONNTRACK */
+#endif
select NETFILTER_NETLINK
depends on NF_CT_NETLINK
depends on NETFILTER_NETLINK_QUEUE
+ depends on NETFILTER_NETLINK_QUEUE_CT
depends on NETFILTER_ADVANCED
help
This option enables the user-space connection tracking helpers
If unsure, say `N'.
+config NETFILTER_NETLINK_QUEUE_CT
+ bool "NFQUEUE integration with Connection Tracking"
+ default n
+ depends on NETFILTER_NETLINK_QUEUE
+ help
+ If this option is enabled, NFQUEUE can include Connection Tracking
+ information together with the packet is the enqueued via NFNETLINK.
+
endif # NF_CONNTRACK
# transparent proxy support
obj-$(CONFIG_NETFILTER_NETLINK) += nfnetlink.o
obj-$(CONFIG_NETFILTER_NETLINK_ACCT) += nfnetlink_acct.o
+nfnetlink_queue-y := nfnetlink_queue_core.o
+nfnetlink_queue-$(CONFIG_NETFILTER_NETLINK_QUEUE_CT) += nfnetlink_queue_ct.o
obj-$(CONFIG_NETFILTER_NETLINK_QUEUE) += nfnetlink_queue.o
obj-$(CONFIG_NETFILTER_NETLINK_LOG) += nfnetlink_log.o
return err;
}
-#if defined(CONFIG_NETFILTER_NETLINK_QUEUE) || \
- defined(CONFIG_NETFILTER_NETLINK_QUEUE_MODULE)
+#ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
static size_t
ctnetlink_nfqueue_build_size(const struct nf_conn *ct)
{
.seq_adjust = nf_nat_tcp_seq_adjust,
#endif
};
-#endif /* CONFIG_NETFILTER_NETLINK_QUEUE */
+#endif /* CONFIG_NETFILTER_NETLINK_QUEUE_CT */
/***********************************************************************
* EXPECT
pr_err("ctnetlink_init: cannot register pernet operations\n");
goto err_unreg_exp_subsys;
}
-#if defined(CONFIG_NETFILTER_NETLINK_QUEUE) || \
- defined(CONFIG_NETFILTER_NETLINK_QUEUE_MODULE)
+#ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
/* setup interaction between nf_queue and nf_conntrack_netlink. */
RCU_INIT_POINTER(nfq_ct_hook, &ctnetlink_nfqueue_hook);
#endif
unregister_pernet_subsys(&ctnetlink_net_ops);
nfnetlink_subsys_unregister(&ctnl_exp_subsys);
nfnetlink_subsys_unregister(&ctnl_subsys);
-#if defined(CONFIG_NETFILTER_NETLINK_QUEUE) || \
- defined(CONFIG_NETFILTER_NETLINK_QUEUE_MODULE)
+#ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
RCU_INIT_POINTER(nfq_ct_hook, NULL);
#endif
}
+++ /dev/null
-/*
- * This is a module which is used for queueing packets and communicating with
- * userspace via nfnetlink.
- *
- * (C) 2005 by Harald Welte <laforge@netfilter.org>
- * (C) 2007 by Patrick McHardy <kaber@trash.net>
- *
- * Based on the old ipv4-only ip_queue.c:
- * (C) 2000-2002 James Morris <jmorris@intercode.com.au>
- * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org>
- *
- * 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/spinlock.h>
-#include <linux/slab.h>
-#include <linux/notifier.h>
-#include <linux/netdevice.h>
-#include <linux/netfilter.h>
-#include <linux/proc_fs.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/netfilter_ipv6.h>
-#include <linux/netfilter/nfnetlink.h>
-#include <linux/netfilter/nfnetlink_queue.h>
-#include <linux/list.h>
-#include <net/sock.h>
-#include <net/netfilter/nf_queue.h>
-#include <net/netfilter/nf_conntrack.h>
-
-#include <linux/atomic.h>
-
-#ifdef CONFIG_BRIDGE_NETFILTER
-#include "../bridge/br_private.h"
-#endif
-
-#define NFQNL_QMAX_DEFAULT 1024
-
-struct nfqnl_instance {
- struct hlist_node hlist; /* global list of queues */
- struct rcu_head rcu;
-
- int peer_pid;
- unsigned int queue_maxlen;
- unsigned int copy_range;
- unsigned int queue_dropped;
- unsigned int queue_user_dropped;
-
-
- u_int16_t queue_num; /* number of this queue */
- u_int8_t copy_mode;
- u_int32_t flags; /* Set using NFQA_CFG_FLAGS */
-/*
- * Following fields are dirtied for each queued packet,
- * keep them in same cache line if possible.
- */
- spinlock_t lock;
- unsigned int queue_total;
- unsigned int id_sequence; /* 'sequence' of pkt ids */
- struct list_head queue_list; /* packets in queue */
-};
-
-typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
-
-static DEFINE_SPINLOCK(instances_lock);
-
-#define INSTANCE_BUCKETS 16
-static struct hlist_head instance_table[INSTANCE_BUCKETS] __read_mostly;
-
-static inline u_int8_t instance_hashfn(u_int16_t queue_num)
-{
- return ((queue_num >> 8) | queue_num) % INSTANCE_BUCKETS;
-}
-
-static struct nfqnl_instance *
-instance_lookup(u_int16_t queue_num)
-{
- struct hlist_head *head;
- struct hlist_node *pos;
- struct nfqnl_instance *inst;
-
- head = &instance_table[instance_hashfn(queue_num)];
- hlist_for_each_entry_rcu(inst, pos, head, hlist) {
- if (inst->queue_num == queue_num)
- return inst;
- }
- return NULL;
-}
-
-static struct nfqnl_instance *
-instance_create(u_int16_t queue_num, int pid)
-{
- struct nfqnl_instance *inst;
- unsigned int h;
- int err;
-
- spin_lock(&instances_lock);
- if (instance_lookup(queue_num)) {
- err = -EEXIST;
- goto out_unlock;
- }
-
- inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
- if (!inst) {
- err = -ENOMEM;
- goto out_unlock;
- }
-
- inst->queue_num = queue_num;
- inst->peer_pid = pid;
- inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
- inst->copy_range = 0xfffff;
- inst->copy_mode = NFQNL_COPY_NONE;
- spin_lock_init(&inst->lock);
- INIT_LIST_HEAD(&inst->queue_list);
-
- if (!try_module_get(THIS_MODULE)) {
- err = -EAGAIN;
- goto out_free;
- }
-
- h = instance_hashfn(queue_num);
- hlist_add_head_rcu(&inst->hlist, &instance_table[h]);
-
- spin_unlock(&instances_lock);
-
- return inst;
-
-out_free:
- kfree(inst);
-out_unlock:
- spin_unlock(&instances_lock);
- return ERR_PTR(err);
-}
-
-static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
- unsigned long data);
-
-static void
-instance_destroy_rcu(struct rcu_head *head)
-{
- struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance,
- rcu);
-
- nfqnl_flush(inst, NULL, 0);
- kfree(inst);
- module_put(THIS_MODULE);
-}
-
-static void
-__instance_destroy(struct nfqnl_instance *inst)
-{
- hlist_del_rcu(&inst->hlist);
- call_rcu(&inst->rcu, instance_destroy_rcu);
-}
-
-static void
-instance_destroy(struct nfqnl_instance *inst)
-{
- spin_lock(&instances_lock);
- __instance_destroy(inst);
- spin_unlock(&instances_lock);
-}
-
-static inline void
-__enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
-{
- list_add_tail(&entry->list, &queue->queue_list);
- queue->queue_total++;
-}
-
-static void
-__dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
-{
- list_del(&entry->list);
- queue->queue_total--;
-}
-
-static struct nf_queue_entry *
-find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
-{
- struct nf_queue_entry *entry = NULL, *i;
-
- spin_lock_bh(&queue->lock);
-
- list_for_each_entry(i, &queue->queue_list, list) {
- if (i->id == id) {
- entry = i;
- break;
- }
- }
-
- if (entry)
- __dequeue_entry(queue, entry);
-
- spin_unlock_bh(&queue->lock);
-
- return entry;
-}
-
-static void
-nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
-{
- struct nf_queue_entry *entry, *next;
-
- spin_lock_bh(&queue->lock);
- list_for_each_entry_safe(entry, next, &queue->queue_list, list) {
- if (!cmpfn || cmpfn(entry, data)) {
- list_del(&entry->list);
- queue->queue_total--;
- nf_reinject(entry, NF_DROP);
- }
- }
- spin_unlock_bh(&queue->lock);
-}
-
-static struct sk_buff *
-nfqnl_build_packet_message(struct nfqnl_instance *queue,
- struct nf_queue_entry *entry,
- __be32 **packet_id_ptr)
-{
- sk_buff_data_t old_tail;
- size_t size;
- size_t data_len = 0;
- struct sk_buff *skb;
- struct nlattr *nla;
- struct nfqnl_msg_packet_hdr *pmsg;
- struct nlmsghdr *nlh;
- struct nfgenmsg *nfmsg;
- struct sk_buff *entskb = entry->skb;
- struct net_device *indev;
- struct net_device *outdev;
- struct nfq_ct_hook *nfq_ct;
- struct nf_conn *ct = NULL;
- enum ip_conntrack_info uninitialized_var(ctinfo);
-
- size = NLMSG_SPACE(sizeof(struct nfgenmsg))
- + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
- + nla_total_size(sizeof(u_int32_t)) /* ifindex */
- + nla_total_size(sizeof(u_int32_t)) /* ifindex */
-#ifdef CONFIG_BRIDGE_NETFILTER
- + nla_total_size(sizeof(u_int32_t)) /* ifindex */
- + nla_total_size(sizeof(u_int32_t)) /* ifindex */
-#endif
- + nla_total_size(sizeof(u_int32_t)) /* mark */
- + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
- + nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
-
- outdev = entry->outdev;
-
- switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) {
- case NFQNL_COPY_META:
- case NFQNL_COPY_NONE:
- break;
-
- case NFQNL_COPY_PACKET:
- if (entskb->ip_summed == CHECKSUM_PARTIAL &&
- skb_checksum_help(entskb))
- return NULL;
-
- data_len = ACCESS_ONCE(queue->copy_range);
- if (data_len == 0 || data_len > entskb->len)
- data_len = entskb->len;
-
- size += nla_total_size(data_len);
- break;
- }
-
- /* rcu_read_lock()ed by __nf_queue already. */
- nfq_ct = rcu_dereference(nfq_ct_hook);
- if (nfq_ct != NULL && (queue->flags & NFQA_CFG_F_CONNTRACK)) {
- ct = nf_ct_get(entskb, &ctinfo);
- if (ct) {
- if (!nf_ct_is_untracked(ct))
- size += nfq_ct->build_size(ct);
- else
- ct = NULL;
- }
- }
-
- skb = alloc_skb(size, GFP_ATOMIC);
- if (!skb)
- goto nlmsg_failure;
-
- old_tail = skb->tail;
- nlh = NLMSG_PUT(skb, 0, 0,
- NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET,
- sizeof(struct nfgenmsg));
- nfmsg = NLMSG_DATA(nlh);
- nfmsg->nfgen_family = entry->pf;
- nfmsg->version = NFNETLINK_V0;
- nfmsg->res_id = htons(queue->queue_num);
-
- nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg));
- pmsg = nla_data(nla);
- pmsg->hw_protocol = entskb->protocol;
- pmsg->hook = entry->hook;
- *packet_id_ptr = &pmsg->packet_id;
-
- indev = entry->indev;
- if (indev) {
-#ifndef CONFIG_BRIDGE_NETFILTER
- if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)))
- goto nla_put_failure;
-#else
- if (entry->pf == PF_BRIDGE) {
- /* Case 1: indev is physical input device, we need to
- * look for bridge group (when called from
- * netfilter_bridge) */
- if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
- htonl(indev->ifindex)) ||
- /* this is the bridge group "brX" */
- /* rcu_read_lock()ed by __nf_queue */
- nla_put_be32(skb, NFQA_IFINDEX_INDEV,
- htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
- goto nla_put_failure;
- } else {
- /* Case 2: indev is bridge group, we need to look for
- * physical device (when called from ipv4) */
- if (nla_put_be32(skb, NFQA_IFINDEX_INDEV,
- htonl(indev->ifindex)))
- goto nla_put_failure;
- if (entskb->nf_bridge && entskb->nf_bridge->physindev &&
- nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
- htonl(entskb->nf_bridge->physindev->ifindex)))
- goto nla_put_failure;
- }
-#endif
- }
-
- if (outdev) {
-#ifndef CONFIG_BRIDGE_NETFILTER
- if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)))
- goto nla_put_failure;
-#else
- if (entry->pf == PF_BRIDGE) {
- /* Case 1: outdev is physical output device, we need to
- * look for bridge group (when called from
- * netfilter_bridge) */
- if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
- htonl(outdev->ifindex)) ||
- /* this is the bridge group "brX" */
- /* rcu_read_lock()ed by __nf_queue */
- nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
- htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
- goto nla_put_failure;
- } else {
- /* Case 2: outdev is bridge group, we need to look for
- * physical output device (when called from ipv4) */
- if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
- htonl(outdev->ifindex)))
- goto nla_put_failure;
- if (entskb->nf_bridge && entskb->nf_bridge->physoutdev &&
- nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
- htonl(entskb->nf_bridge->physoutdev->ifindex)))
- goto nla_put_failure;
- }
-#endif
- }
-
- if (entskb->mark &&
- nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark)))
- goto nla_put_failure;
-
- if (indev && entskb->dev &&
- entskb->mac_header != entskb->network_header) {
- struct nfqnl_msg_packet_hw phw;
- int len = dev_parse_header(entskb, phw.hw_addr);
- if (len) {
- phw.hw_addrlen = htons(len);
- if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw))
- goto nla_put_failure;
- }
- }
-
- if (entskb->tstamp.tv64) {
- struct nfqnl_msg_packet_timestamp ts;
- struct timeval tv = ktime_to_timeval(entskb->tstamp);
- ts.sec = cpu_to_be64(tv.tv_sec);
- ts.usec = cpu_to_be64(tv.tv_usec);
-
- if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
- goto nla_put_failure;
- }
-
- if (data_len) {
- struct nlattr *nla;
- int sz = nla_attr_size(data_len);
-
- if (skb_tailroom(skb) < nla_total_size(data_len)) {
- printk(KERN_WARNING "nf_queue: no tailroom!\n");
- goto nlmsg_failure;
- }
-
- nla = (struct nlattr *)skb_put(skb, nla_total_size(data_len));
- nla->nla_type = NFQA_PAYLOAD;
- nla->nla_len = sz;
-
- if (skb_copy_bits(entskb, 0, nla_data(nla), data_len))
- BUG();
- }
-
- if (ct) {
- struct nlattr *nest_parms;
- u_int32_t tmp;
-
- nest_parms = nla_nest_start(skb, NFQA_CT | NLA_F_NESTED);
- if (!nest_parms)
- goto nla_put_failure;
-
- if (nfq_ct->build(skb, ct) < 0)
- goto nla_put_failure;
-
- nla_nest_end(skb, nest_parms);
-
- tmp = ctinfo;
- if (nla_put_u32(skb, NFQA_CT_INFO, htonl(ctinfo)))
- goto nla_put_failure;
- }
-
- nlh->nlmsg_len = skb->tail - old_tail;
- return skb;
-
-nlmsg_failure:
-nla_put_failure:
- if (skb)
- kfree_skb(skb);
- net_err_ratelimited("nf_queue: error creating packet message\n");
- return NULL;
-}
-
-static int
-nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
-{
- struct sk_buff *nskb;
- struct nfqnl_instance *queue;
- int err = -ENOBUFS;
- __be32 *packet_id_ptr;
- int failopen = 0;
-
- /* rcu_read_lock()ed by nf_hook_slow() */
- queue = instance_lookup(queuenum);
- if (!queue) {
- err = -ESRCH;
- goto err_out;
- }
-
- if (queue->copy_mode == NFQNL_COPY_NONE) {
- err = -EINVAL;
- goto err_out;
- }
-
- nskb = nfqnl_build_packet_message(queue, entry, &packet_id_ptr);
- if (nskb == NULL) {
- err = -ENOMEM;
- goto err_out;
- }
- spin_lock_bh(&queue->lock);
-
- if (!queue->peer_pid) {
- err = -EINVAL;
- goto err_out_free_nskb;
- }
- if (queue->queue_total >= queue->queue_maxlen) {
- if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
- failopen = 1;
- err = 0;
- } else {
- queue->queue_dropped++;
- net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
- queue->queue_total);
- }
- goto err_out_free_nskb;
- }
- entry->id = ++queue->id_sequence;
- *packet_id_ptr = htonl(entry->id);
-
- /* nfnetlink_unicast will either free the nskb or add it to a socket */
- err = nfnetlink_unicast(nskb, &init_net, queue->peer_pid, MSG_DONTWAIT);
- if (err < 0) {
- queue->queue_user_dropped++;
- goto err_out_unlock;
- }
-
- __enqueue_entry(queue, entry);
-
- spin_unlock_bh(&queue->lock);
- return 0;
-
-err_out_free_nskb:
- kfree_skb(nskb);
-err_out_unlock:
- spin_unlock_bh(&queue->lock);
- if (failopen)
- nf_reinject(entry, NF_ACCEPT);
-err_out:
- return err;
-}
-
-static int
-nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff)
-{
- struct sk_buff *nskb;
-
- if (diff < 0) {
- if (pskb_trim(e->skb, data_len))
- return -ENOMEM;
- } else if (diff > 0) {
- if (data_len > 0xFFFF)
- return -EINVAL;
- if (diff > skb_tailroom(e->skb)) {
- nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
- diff, GFP_ATOMIC);
- if (!nskb) {
- printk(KERN_WARNING "nf_queue: OOM "
- "in mangle, dropping packet\n");
- return -ENOMEM;
- }
- kfree_skb(e->skb);
- e->skb = nskb;
- }
- skb_put(e->skb, diff);
- }
- if (!skb_make_writable(e->skb, data_len))
- return -ENOMEM;
- skb_copy_to_linear_data(e->skb, data, data_len);
- e->skb->ip_summed = CHECKSUM_NONE;
- return 0;
-}
-
-static int
-nfqnl_set_mode(struct nfqnl_instance *queue,
- unsigned char mode, unsigned int range)
-{
- int status = 0;
-
- spin_lock_bh(&queue->lock);
- switch (mode) {
- case NFQNL_COPY_NONE:
- case NFQNL_COPY_META:
- queue->copy_mode = mode;
- queue->copy_range = 0;
- break;
-
- case NFQNL_COPY_PACKET:
- queue->copy_mode = mode;
- /* we're using struct nlattr which has 16bit nla_len */
- if (range > 0xffff)
- queue->copy_range = 0xffff;
- else
- queue->copy_range = range;
- break;
-
- default:
- status = -EINVAL;
-
- }
- spin_unlock_bh(&queue->lock);
-
- return status;
-}
-
-static int
-dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
-{
- if (entry->indev)
- if (entry->indev->ifindex == ifindex)
- return 1;
- if (entry->outdev)
- if (entry->outdev->ifindex == ifindex)
- return 1;
-#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)
- return 1;
- }
-#endif
- return 0;
-}
-
-/* drop all packets with either indev or outdev == ifindex from all queue
- * instances */
-static void
-nfqnl_dev_drop(int ifindex)
-{
- int i;
-
- rcu_read_lock();
-
- for (i = 0; i < INSTANCE_BUCKETS; i++) {
- struct hlist_node *tmp;
- struct nfqnl_instance *inst;
- struct hlist_head *head = &instance_table[i];
-
- hlist_for_each_entry_rcu(inst, tmp, head, hlist)
- nfqnl_flush(inst, dev_cmp, ifindex);
- }
-
- rcu_read_unlock();
-}
-
-#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
-
-static int
-nfqnl_rcv_dev_event(struct notifier_block *this,
- unsigned long event, void *ptr)
-{
- struct net_device *dev = ptr;
-
- if (!net_eq(dev_net(dev), &init_net))
- return NOTIFY_DONE;
-
- /* Drop any packets associated with the downed device */
- if (event == NETDEV_DOWN)
- nfqnl_dev_drop(dev->ifindex);
- return NOTIFY_DONE;
-}
-
-static struct notifier_block nfqnl_dev_notifier = {
- .notifier_call = nfqnl_rcv_dev_event,
-};
-
-static int
-nfqnl_rcv_nl_event(struct notifier_block *this,
- unsigned long event, void *ptr)
-{
- struct netlink_notify *n = ptr;
-
- if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
- int i;
-
- /* destroy all instances for this pid */
- spin_lock(&instances_lock);
- for (i = 0; i < INSTANCE_BUCKETS; i++) {
- struct hlist_node *tmp, *t2;
- struct nfqnl_instance *inst;
- struct hlist_head *head = &instance_table[i];
-
- hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) {
- if ((n->net == &init_net) &&
- (n->pid == inst->peer_pid))
- __instance_destroy(inst);
- }
- }
- spin_unlock(&instances_lock);
- }
- return NOTIFY_DONE;
-}
-
-static struct notifier_block nfqnl_rtnl_notifier = {
- .notifier_call = nfqnl_rcv_nl_event,
-};
-
-static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
- [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
- [NFQA_MARK] = { .type = NLA_U32 },
- [NFQA_PAYLOAD] = { .type = NLA_UNSPEC },
- [NFQA_CT] = { .type = NLA_UNSPEC },
-};
-
-static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
- [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
- [NFQA_MARK] = { .type = NLA_U32 },
-};
-
-static struct nfqnl_instance *verdict_instance_lookup(u16 queue_num, int nlpid)
-{
- struct nfqnl_instance *queue;
-
- queue = instance_lookup(queue_num);
- if (!queue)
- return ERR_PTR(-ENODEV);
-
- if (queue->peer_pid != nlpid)
- return ERR_PTR(-EPERM);
-
- return queue;
-}
-
-static struct nfqnl_msg_verdict_hdr*
-verdicthdr_get(const struct nlattr * const nfqa[])
-{
- struct nfqnl_msg_verdict_hdr *vhdr;
- unsigned int verdict;
-
- if (!nfqa[NFQA_VERDICT_HDR])
- return NULL;
-
- vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
- verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
- if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
- return NULL;
- return vhdr;
-}
-
-static int nfq_id_after(unsigned int id, unsigned int max)
-{
- return (int)(id - max) > 0;
-}
-
-static int
-nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- const struct nlattr * const nfqa[])
-{
- struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
- struct nf_queue_entry *entry, *tmp;
- unsigned int verdict, maxid;
- struct nfqnl_msg_verdict_hdr *vhdr;
- struct nfqnl_instance *queue;
- LIST_HEAD(batch_list);
- u16 queue_num = ntohs(nfmsg->res_id);
-
- queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).pid);
- if (IS_ERR(queue))
- return PTR_ERR(queue);
-
- vhdr = verdicthdr_get(nfqa);
- if (!vhdr)
- return -EINVAL;
-
- verdict = ntohl(vhdr->verdict);
- maxid = ntohl(vhdr->id);
-
- spin_lock_bh(&queue->lock);
-
- list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
- if (nfq_id_after(entry->id, maxid))
- break;
- __dequeue_entry(queue, entry);
- list_add_tail(&entry->list, &batch_list);
- }
-
- spin_unlock_bh(&queue->lock);
-
- if (list_empty(&batch_list))
- return -ENOENT;
-
- list_for_each_entry_safe(entry, tmp, &batch_list, list) {
- if (nfqa[NFQA_MARK])
- entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
- nf_reinject(entry, verdict);
- }
- return 0;
-}
-
-static int
-nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- const struct nlattr * const nfqa[])
-{
- struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
- u_int16_t queue_num = ntohs(nfmsg->res_id);
-
- struct nfqnl_msg_verdict_hdr *vhdr;
- struct nfqnl_instance *queue;
- unsigned int verdict;
- struct nf_queue_entry *entry;
- struct nfq_ct_hook *nfq_ct;
- enum ip_conntrack_info uninitialized_var(ctinfo);
- struct nf_conn *ct = NULL;
-
- queue = instance_lookup(queue_num);
- if (!queue)
-
- queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).pid);
- if (IS_ERR(queue))
- return PTR_ERR(queue);
-
- vhdr = verdicthdr_get(nfqa);
- if (!vhdr)
- return -EINVAL;
-
- verdict = ntohl(vhdr->verdict);
-
- entry = find_dequeue_entry(queue, ntohl(vhdr->id));
- if (entry == NULL)
- return -ENOENT;
-
- rcu_read_lock();
- nfq_ct = rcu_dereference(nfq_ct_hook);
- if (nfq_ct != NULL &&
- (queue->flags & NFQA_CFG_F_CONNTRACK) && nfqa[NFQA_CT]) {
- ct = nf_ct_get(entry->skb, &ctinfo);
- if (ct && !nf_ct_is_untracked(ct))
- nfq_ct->parse(nfqa[NFQA_CT], ct);
- }
-
- if (nfqa[NFQA_PAYLOAD]) {
- u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
- int diff = payload_len - entry->skb->len;
-
- if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
- payload_len, entry, diff) < 0)
- verdict = NF_DROP;
-
- if (ct && (ct->status & IPS_NAT_MASK) && diff)
- nfq_ct->seq_adjust(skb, ct, ctinfo, diff);
- }
- rcu_read_unlock();
-
- if (nfqa[NFQA_MARK])
- entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
-
- nf_reinject(entry, verdict);
- return 0;
-}
-
-static int
-nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- const struct nlattr * const nfqa[])
-{
- return -ENOTSUPP;
-}
-
-static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
- [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) },
- [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) },
-};
-
-static const struct nf_queue_handler nfqh = {
- .name = "nf_queue",
- .outfn = &nfqnl_enqueue_packet,
-};
-
-static int
-nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- const struct nlattr * const nfqa[])
-{
- struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
- u_int16_t queue_num = ntohs(nfmsg->res_id);
- struct nfqnl_instance *queue;
- struct nfqnl_msg_config_cmd *cmd = NULL;
- int ret = 0;
-
- if (nfqa[NFQA_CFG_CMD]) {
- cmd = nla_data(nfqa[NFQA_CFG_CMD]);
-
- /* Commands without queue context - might sleep */
- switch (cmd->command) {
- case NFQNL_CFG_CMD_PF_BIND:
- return nf_register_queue_handler(ntohs(cmd->pf),
- &nfqh);
- case NFQNL_CFG_CMD_PF_UNBIND:
- return nf_unregister_queue_handler(ntohs(cmd->pf),
- &nfqh);
- }
- }
-
- rcu_read_lock();
- queue = instance_lookup(queue_num);
- if (queue && queue->peer_pid != NETLINK_CB(skb).pid) {
- ret = -EPERM;
- goto err_out_unlock;
- }
-
- if (cmd != NULL) {
- switch (cmd->command) {
- case NFQNL_CFG_CMD_BIND:
- if (queue) {
- ret = -EBUSY;
- goto err_out_unlock;
- }
- queue = instance_create(queue_num, NETLINK_CB(skb).pid);
- if (IS_ERR(queue)) {
- ret = PTR_ERR(queue);
- goto err_out_unlock;
- }
- break;
- case NFQNL_CFG_CMD_UNBIND:
- if (!queue) {
- ret = -ENODEV;
- goto err_out_unlock;
- }
- instance_destroy(queue);
- break;
- case NFQNL_CFG_CMD_PF_BIND:
- case NFQNL_CFG_CMD_PF_UNBIND:
- break;
- default:
- ret = -ENOTSUPP;
- break;
- }
- }
-
- if (nfqa[NFQA_CFG_PARAMS]) {
- struct nfqnl_msg_config_params *params;
-
- if (!queue) {
- ret = -ENODEV;
- goto err_out_unlock;
- }
- params = nla_data(nfqa[NFQA_CFG_PARAMS]);
- nfqnl_set_mode(queue, params->copy_mode,
- ntohl(params->copy_range));
- }
-
- if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
- __be32 *queue_maxlen;
-
- if (!queue) {
- ret = -ENODEV;
- goto err_out_unlock;
- }
- queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
- spin_lock_bh(&queue->lock);
- queue->queue_maxlen = ntohl(*queue_maxlen);
- spin_unlock_bh(&queue->lock);
- }
-
- if (nfqa[NFQA_CFG_FLAGS]) {
- __u32 flags, mask;
-
- if (!queue) {
- ret = -ENODEV;
- goto err_out_unlock;
- }
-
- if (!nfqa[NFQA_CFG_MASK]) {
- /* A mask is needed to specify which flags are being
- * changed.
- */
- ret = -EINVAL;
- goto err_out_unlock;
- }
-
- flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
- mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
-
- spin_lock_bh(&queue->lock);
- queue->flags &= ~mask;
- queue->flags |= flags & mask;
- spin_unlock_bh(&queue->lock);
- }
-
-err_out_unlock:
- rcu_read_unlock();
- return ret;
-}
-
-static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
- [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp,
- .attr_count = NFQA_MAX, },
- [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict,
- .attr_count = NFQA_MAX,
- .policy = nfqa_verdict_policy },
- [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config,
- .attr_count = NFQA_CFG_MAX,
- .policy = nfqa_cfg_policy },
- [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch,
- .attr_count = NFQA_MAX,
- .policy = nfqa_verdict_batch_policy },
-};
-
-static const struct nfnetlink_subsystem nfqnl_subsys = {
- .name = "nf_queue",
- .subsys_id = NFNL_SUBSYS_QUEUE,
- .cb_count = NFQNL_MSG_MAX,
- .cb = nfqnl_cb,
-};
-
-#ifdef CONFIG_PROC_FS
-struct iter_state {
- unsigned int bucket;
-};
-
-static struct hlist_node *get_first(struct seq_file *seq)
-{
- struct iter_state *st = seq->private;
-
- if (!st)
- return NULL;
-
- for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
- if (!hlist_empty(&instance_table[st->bucket]))
- return instance_table[st->bucket].first;
- }
- return NULL;
-}
-
-static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
-{
- struct iter_state *st = seq->private;
-
- h = h->next;
- while (!h) {
- if (++st->bucket >= INSTANCE_BUCKETS)
- return NULL;
-
- h = instance_table[st->bucket].first;
- }
- return h;
-}
-
-static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
-{
- struct hlist_node *head;
- head = get_first(seq);
-
- if (head)
- while (pos && (head = get_next(seq, head)))
- pos--;
- return pos ? NULL : head;
-}
-
-static void *seq_start(struct seq_file *seq, loff_t *pos)
- __acquires(instances_lock)
-{
- spin_lock(&instances_lock);
- return get_idx(seq, *pos);
-}
-
-static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
-{
- (*pos)++;
- return get_next(s, v);
-}
-
-static void seq_stop(struct seq_file *s, void *v)
- __releases(instances_lock)
-{
- spin_unlock(&instances_lock);
-}
-
-static int seq_show(struct seq_file *s, void *v)
-{
- const struct nfqnl_instance *inst = v;
-
- return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
- inst->queue_num,
- inst->peer_pid, inst->queue_total,
- inst->copy_mode, inst->copy_range,
- inst->queue_dropped, inst->queue_user_dropped,
- inst->id_sequence, 1);
-}
-
-static const struct seq_operations nfqnl_seq_ops = {
- .start = seq_start,
- .next = seq_next,
- .stop = seq_stop,
- .show = seq_show,
-};
-
-static int nfqnl_open(struct inode *inode, struct file *file)
-{
- return seq_open_private(file, &nfqnl_seq_ops,
- sizeof(struct iter_state));
-}
-
-static const struct file_operations nfqnl_file_ops = {
- .owner = THIS_MODULE,
- .open = nfqnl_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release_private,
-};
-
-#endif /* PROC_FS */
-
-static int __init nfnetlink_queue_init(void)
-{
- int i, status = -ENOMEM;
-
- for (i = 0; i < INSTANCE_BUCKETS; i++)
- INIT_HLIST_HEAD(&instance_table[i]);
-
- netlink_register_notifier(&nfqnl_rtnl_notifier);
- status = nfnetlink_subsys_register(&nfqnl_subsys);
- if (status < 0) {
- printk(KERN_ERR "nf_queue: failed to create netlink socket\n");
- goto cleanup_netlink_notifier;
- }
-
-#ifdef CONFIG_PROC_FS
- if (!proc_create("nfnetlink_queue", 0440,
- proc_net_netfilter, &nfqnl_file_ops))
- goto cleanup_subsys;
-#endif
-
- register_netdevice_notifier(&nfqnl_dev_notifier);
- return status;
-
-#ifdef CONFIG_PROC_FS
-cleanup_subsys:
- nfnetlink_subsys_unregister(&nfqnl_subsys);
-#endif
-cleanup_netlink_notifier:
- netlink_unregister_notifier(&nfqnl_rtnl_notifier);
- return status;
-}
-
-static void __exit nfnetlink_queue_fini(void)
-{
- nf_unregister_queue_handlers(&nfqh);
- unregister_netdevice_notifier(&nfqnl_dev_notifier);
-#ifdef CONFIG_PROC_FS
- remove_proc_entry("nfnetlink_queue", proc_net_netfilter);
-#endif
- nfnetlink_subsys_unregister(&nfqnl_subsys);
- netlink_unregister_notifier(&nfqnl_rtnl_notifier);
-
- rcu_barrier(); /* Wait for completion of call_rcu()'s */
-}
-
-MODULE_DESCRIPTION("netfilter packet queue handler");
-MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
-
-module_init(nfnetlink_queue_init);
-module_exit(nfnetlink_queue_fini);
--- /dev/null
+/*
+ * This is a module which is used for queueing packets and communicating with
+ * userspace via nfnetlink.
+ *
+ * (C) 2005 by Harald Welte <laforge@netfilter.org>
+ * (C) 2007 by Patrick McHardy <kaber@trash.net>
+ *
+ * Based on the old ipv4-only ip_queue.c:
+ * (C) 2000-2002 James Morris <jmorris@intercode.com.au>
+ * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * 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/spinlock.h>
+#include <linux/slab.h>
+#include <linux/notifier.h>
+#include <linux/netdevice.h>
+#include <linux/netfilter.h>
+#include <linux/proc_fs.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nfnetlink_queue.h>
+#include <linux/list.h>
+#include <net/sock.h>
+#include <net/netfilter/nf_queue.h>
+#include <net/netfilter/nfnetlink_queue.h>
+
+#include <linux/atomic.h>
+
+#ifdef CONFIG_BRIDGE_NETFILTER
+#include "../bridge/br_private.h"
+#endif
+
+#define NFQNL_QMAX_DEFAULT 1024
+
+struct nfqnl_instance {
+ struct hlist_node hlist; /* global list of queues */
+ struct rcu_head rcu;
+
+ int peer_pid;
+ unsigned int queue_maxlen;
+ unsigned int copy_range;
+ unsigned int queue_dropped;
+ unsigned int queue_user_dropped;
+
+
+ u_int16_t queue_num; /* number of this queue */
+ u_int8_t copy_mode;
+ u_int32_t flags; /* Set using NFQA_CFG_FLAGS */
+/*
+ * Following fields are dirtied for each queued packet,
+ * keep them in same cache line if possible.
+ */
+ spinlock_t lock;
+ unsigned int queue_total;
+ unsigned int id_sequence; /* 'sequence' of pkt ids */
+ struct list_head queue_list; /* packets in queue */
+};
+
+typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
+
+static DEFINE_SPINLOCK(instances_lock);
+
+#define INSTANCE_BUCKETS 16
+static struct hlist_head instance_table[INSTANCE_BUCKETS] __read_mostly;
+
+static inline u_int8_t instance_hashfn(u_int16_t queue_num)
+{
+ return ((queue_num >> 8) | queue_num) % INSTANCE_BUCKETS;
+}
+
+static struct nfqnl_instance *
+instance_lookup(u_int16_t queue_num)
+{
+ struct hlist_head *head;
+ struct hlist_node *pos;
+ struct nfqnl_instance *inst;
+
+ head = &instance_table[instance_hashfn(queue_num)];
+ hlist_for_each_entry_rcu(inst, pos, head, hlist) {
+ if (inst->queue_num == queue_num)
+ return inst;
+ }
+ return NULL;
+}
+
+static struct nfqnl_instance *
+instance_create(u_int16_t queue_num, int pid)
+{
+ struct nfqnl_instance *inst;
+ unsigned int h;
+ int err;
+
+ spin_lock(&instances_lock);
+ if (instance_lookup(queue_num)) {
+ err = -EEXIST;
+ goto out_unlock;
+ }
+
+ inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
+ if (!inst) {
+ err = -ENOMEM;
+ goto out_unlock;
+ }
+
+ inst->queue_num = queue_num;
+ inst->peer_pid = pid;
+ inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
+ inst->copy_range = 0xfffff;
+ inst->copy_mode = NFQNL_COPY_NONE;
+ spin_lock_init(&inst->lock);
+ INIT_LIST_HEAD(&inst->queue_list);
+
+ if (!try_module_get(THIS_MODULE)) {
+ err = -EAGAIN;
+ goto out_free;
+ }
+
+ h = instance_hashfn(queue_num);
+ hlist_add_head_rcu(&inst->hlist, &instance_table[h]);
+
+ spin_unlock(&instances_lock);
+
+ return inst;
+
+out_free:
+ kfree(inst);
+out_unlock:
+ spin_unlock(&instances_lock);
+ return ERR_PTR(err);
+}
+
+static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
+ unsigned long data);
+
+static void
+instance_destroy_rcu(struct rcu_head *head)
+{
+ struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance,
+ rcu);
+
+ nfqnl_flush(inst, NULL, 0);
+ kfree(inst);
+ module_put(THIS_MODULE);
+}
+
+static void
+__instance_destroy(struct nfqnl_instance *inst)
+{
+ hlist_del_rcu(&inst->hlist);
+ call_rcu(&inst->rcu, instance_destroy_rcu);
+}
+
+static void
+instance_destroy(struct nfqnl_instance *inst)
+{
+ spin_lock(&instances_lock);
+ __instance_destroy(inst);
+ spin_unlock(&instances_lock);
+}
+
+static inline void
+__enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
+{
+ list_add_tail(&entry->list, &queue->queue_list);
+ queue->queue_total++;
+}
+
+static void
+__dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
+{
+ list_del(&entry->list);
+ queue->queue_total--;
+}
+
+static struct nf_queue_entry *
+find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
+{
+ struct nf_queue_entry *entry = NULL, *i;
+
+ spin_lock_bh(&queue->lock);
+
+ list_for_each_entry(i, &queue->queue_list, list) {
+ if (i->id == id) {
+ entry = i;
+ break;
+ }
+ }
+
+ if (entry)
+ __dequeue_entry(queue, entry);
+
+ spin_unlock_bh(&queue->lock);
+
+ return entry;
+}
+
+static void
+nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
+{
+ struct nf_queue_entry *entry, *next;
+
+ spin_lock_bh(&queue->lock);
+ list_for_each_entry_safe(entry, next, &queue->queue_list, list) {
+ if (!cmpfn || cmpfn(entry, data)) {
+ list_del(&entry->list);
+ queue->queue_total--;
+ nf_reinject(entry, NF_DROP);
+ }
+ }
+ spin_unlock_bh(&queue->lock);
+}
+
+static struct sk_buff *
+nfqnl_build_packet_message(struct nfqnl_instance *queue,
+ struct nf_queue_entry *entry,
+ __be32 **packet_id_ptr)
+{
+ sk_buff_data_t old_tail;
+ size_t size;
+ size_t data_len = 0;
+ struct sk_buff *skb;
+ struct nlattr *nla;
+ struct nfqnl_msg_packet_hdr *pmsg;
+ struct nlmsghdr *nlh;
+ struct nfgenmsg *nfmsg;
+ struct sk_buff *entskb = entry->skb;
+ struct net_device *indev;
+ struct net_device *outdev;
+ struct nf_conn *ct = NULL;
+ enum ip_conntrack_info uninitialized_var(ctinfo);
+
+ size = NLMSG_SPACE(sizeof(struct nfgenmsg))
+ + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
+ + nla_total_size(sizeof(u_int32_t)) /* ifindex */
+ + nla_total_size(sizeof(u_int32_t)) /* ifindex */
+#ifdef CONFIG_BRIDGE_NETFILTER
+ + nla_total_size(sizeof(u_int32_t)) /* ifindex */
+ + nla_total_size(sizeof(u_int32_t)) /* ifindex */
+#endif
+ + nla_total_size(sizeof(u_int32_t)) /* mark */
+ + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
+ + nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
+
+ outdev = entry->outdev;
+
+ switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) {
+ case NFQNL_COPY_META:
+ case NFQNL_COPY_NONE:
+ break;
+
+ case NFQNL_COPY_PACKET:
+ if (entskb->ip_summed == CHECKSUM_PARTIAL &&
+ skb_checksum_help(entskb))
+ return NULL;
+
+ data_len = ACCESS_ONCE(queue->copy_range);
+ if (data_len == 0 || data_len > entskb->len)
+ data_len = entskb->len;
+
+ size += nla_total_size(data_len);
+ break;
+ }
+
+ if (queue->flags & NFQA_CFG_F_CONNTRACK)
+ ct = nfqnl_ct_get(entskb, &size, &ctinfo);
+
+ skb = alloc_skb(size, GFP_ATOMIC);
+ if (!skb)
+ goto nlmsg_failure;
+
+ old_tail = skb->tail;
+ nlh = NLMSG_PUT(skb, 0, 0,
+ NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET,
+ sizeof(struct nfgenmsg));
+ nfmsg = NLMSG_DATA(nlh);
+ nfmsg->nfgen_family = entry->pf;
+ nfmsg->version = NFNETLINK_V0;
+ nfmsg->res_id = htons(queue->queue_num);
+
+ nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg));
+ pmsg = nla_data(nla);
+ pmsg->hw_protocol = entskb->protocol;
+ pmsg->hook = entry->hook;
+ *packet_id_ptr = &pmsg->packet_id;
+
+ indev = entry->indev;
+ if (indev) {
+#ifndef CONFIG_BRIDGE_NETFILTER
+ if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)))
+ goto nla_put_failure;
+#else
+ if (entry->pf == PF_BRIDGE) {
+ /* Case 1: indev is physical input device, we need to
+ * look for bridge group (when called from
+ * netfilter_bridge) */
+ if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
+ htonl(indev->ifindex)) ||
+ /* this is the bridge group "brX" */
+ /* rcu_read_lock()ed by __nf_queue */
+ nla_put_be32(skb, NFQA_IFINDEX_INDEV,
+ htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
+ goto nla_put_failure;
+ } else {
+ /* Case 2: indev is bridge group, we need to look for
+ * physical device (when called from ipv4) */
+ if (nla_put_be32(skb, NFQA_IFINDEX_INDEV,
+ htonl(indev->ifindex)))
+ goto nla_put_failure;
+ if (entskb->nf_bridge && entskb->nf_bridge->physindev &&
+ nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
+ htonl(entskb->nf_bridge->physindev->ifindex)))
+ goto nla_put_failure;
+ }
+#endif
+ }
+
+ if (outdev) {
+#ifndef CONFIG_BRIDGE_NETFILTER
+ if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)))
+ goto nla_put_failure;
+#else
+ if (entry->pf == PF_BRIDGE) {
+ /* Case 1: outdev is physical output device, we need to
+ * look for bridge group (when called from
+ * netfilter_bridge) */
+ if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
+ htonl(outdev->ifindex)) ||
+ /* this is the bridge group "brX" */
+ /* rcu_read_lock()ed by __nf_queue */
+ nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
+ htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
+ goto nla_put_failure;
+ } else {
+ /* Case 2: outdev is bridge group, we need to look for
+ * physical output device (when called from ipv4) */
+ if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
+ htonl(outdev->ifindex)))
+ goto nla_put_failure;
+ if (entskb->nf_bridge && entskb->nf_bridge->physoutdev &&
+ nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
+ htonl(entskb->nf_bridge->physoutdev->ifindex)))
+ goto nla_put_failure;
+ }
+#endif
+ }
+
+ if (entskb->mark &&
+ nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark)))
+ goto nla_put_failure;
+
+ if (indev && entskb->dev &&
+ entskb->mac_header != entskb->network_header) {
+ struct nfqnl_msg_packet_hw phw;
+ int len = dev_parse_header(entskb, phw.hw_addr);
+ if (len) {
+ phw.hw_addrlen = htons(len);
+ if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw))
+ goto nla_put_failure;
+ }
+ }
+
+ if (entskb->tstamp.tv64) {
+ struct nfqnl_msg_packet_timestamp ts;
+ struct timeval tv = ktime_to_timeval(entskb->tstamp);
+ ts.sec = cpu_to_be64(tv.tv_sec);
+ ts.usec = cpu_to_be64(tv.tv_usec);
+
+ if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
+ goto nla_put_failure;
+ }
+
+ if (data_len) {
+ struct nlattr *nla;
+ int sz = nla_attr_size(data_len);
+
+ if (skb_tailroom(skb) < nla_total_size(data_len)) {
+ printk(KERN_WARNING "nf_queue: no tailroom!\n");
+ goto nlmsg_failure;
+ }
+
+ nla = (struct nlattr *)skb_put(skb, nla_total_size(data_len));
+ nla->nla_type = NFQA_PAYLOAD;
+ nla->nla_len = sz;
+
+ if (skb_copy_bits(entskb, 0, nla_data(nla), data_len))
+ BUG();
+ }
+
+ if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0)
+ goto nla_put_failure;
+
+ nlh->nlmsg_len = skb->tail - old_tail;
+ return skb;
+
+nlmsg_failure:
+nla_put_failure:
+ if (skb)
+ kfree_skb(skb);
+ net_err_ratelimited("nf_queue: error creating packet message\n");
+ return NULL;
+}
+
+static int
+nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
+{
+ struct sk_buff *nskb;
+ struct nfqnl_instance *queue;
+ int err = -ENOBUFS;
+ __be32 *packet_id_ptr;
+ int failopen = 0;
+
+ /* rcu_read_lock()ed by nf_hook_slow() */
+ queue = instance_lookup(queuenum);
+ if (!queue) {
+ err = -ESRCH;
+ goto err_out;
+ }
+
+ if (queue->copy_mode == NFQNL_COPY_NONE) {
+ err = -EINVAL;
+ goto err_out;
+ }
+
+ nskb = nfqnl_build_packet_message(queue, entry, &packet_id_ptr);
+ if (nskb == NULL) {
+ err = -ENOMEM;
+ goto err_out;
+ }
+ spin_lock_bh(&queue->lock);
+
+ if (!queue->peer_pid) {
+ err = -EINVAL;
+ goto err_out_free_nskb;
+ }
+ if (queue->queue_total >= queue->queue_maxlen) {
+ if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
+ failopen = 1;
+ err = 0;
+ } else {
+ queue->queue_dropped++;
+ net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
+ queue->queue_total);
+ }
+ goto err_out_free_nskb;
+ }
+ entry->id = ++queue->id_sequence;
+ *packet_id_ptr = htonl(entry->id);
+
+ /* nfnetlink_unicast will either free the nskb or add it to a socket */
+ err = nfnetlink_unicast(nskb, &init_net, queue->peer_pid, MSG_DONTWAIT);
+ if (err < 0) {
+ queue->queue_user_dropped++;
+ goto err_out_unlock;
+ }
+
+ __enqueue_entry(queue, entry);
+
+ spin_unlock_bh(&queue->lock);
+ return 0;
+
+err_out_free_nskb:
+ kfree_skb(nskb);
+err_out_unlock:
+ spin_unlock_bh(&queue->lock);
+ if (failopen)
+ nf_reinject(entry, NF_ACCEPT);
+err_out:
+ return err;
+}
+
+static int
+nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff)
+{
+ struct sk_buff *nskb;
+
+ if (diff < 0) {
+ if (pskb_trim(e->skb, data_len))
+ return -ENOMEM;
+ } else if (diff > 0) {
+ if (data_len > 0xFFFF)
+ return -EINVAL;
+ if (diff > skb_tailroom(e->skb)) {
+ nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
+ diff, GFP_ATOMIC);
+ if (!nskb) {
+ printk(KERN_WARNING "nf_queue: OOM "
+ "in mangle, dropping packet\n");
+ return -ENOMEM;
+ }
+ kfree_skb(e->skb);
+ e->skb = nskb;
+ }
+ skb_put(e->skb, diff);
+ }
+ if (!skb_make_writable(e->skb, data_len))
+ return -ENOMEM;
+ skb_copy_to_linear_data(e->skb, data, data_len);
+ e->skb->ip_summed = CHECKSUM_NONE;
+ return 0;
+}
+
+static int
+nfqnl_set_mode(struct nfqnl_instance *queue,
+ unsigned char mode, unsigned int range)
+{
+ int status = 0;
+
+ spin_lock_bh(&queue->lock);
+ switch (mode) {
+ case NFQNL_COPY_NONE:
+ case NFQNL_COPY_META:
+ queue->copy_mode = mode;
+ queue->copy_range = 0;
+ break;
+
+ case NFQNL_COPY_PACKET:
+ queue->copy_mode = mode;
+ /* we're using struct nlattr which has 16bit nla_len */
+ if (range > 0xffff)
+ queue->copy_range = 0xffff;
+ else
+ queue->copy_range = range;
+ break;
+
+ default:
+ status = -EINVAL;
+
+ }
+ spin_unlock_bh(&queue->lock);
+
+ return status;
+}
+
+static int
+dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
+{
+ if (entry->indev)
+ if (entry->indev->ifindex == ifindex)
+ return 1;
+ if (entry->outdev)
+ if (entry->outdev->ifindex == ifindex)
+ return 1;
+#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)
+ return 1;
+ }
+#endif
+ return 0;
+}
+
+/* drop all packets with either indev or outdev == ifindex from all queue
+ * instances */
+static void
+nfqnl_dev_drop(int ifindex)
+{
+ int i;
+
+ rcu_read_lock();
+
+ for (i = 0; i < INSTANCE_BUCKETS; i++) {
+ struct hlist_node *tmp;
+ struct nfqnl_instance *inst;
+ struct hlist_head *head = &instance_table[i];
+
+ hlist_for_each_entry_rcu(inst, tmp, head, hlist)
+ nfqnl_flush(inst, dev_cmp, ifindex);
+ }
+
+ rcu_read_unlock();
+}
+
+#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
+
+static int
+nfqnl_rcv_dev_event(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ struct net_device *dev = ptr;
+
+ if (!net_eq(dev_net(dev), &init_net))
+ return NOTIFY_DONE;
+
+ /* Drop any packets associated with the downed device */
+ if (event == NETDEV_DOWN)
+ nfqnl_dev_drop(dev->ifindex);
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block nfqnl_dev_notifier = {
+ .notifier_call = nfqnl_rcv_dev_event,
+};
+
+static int
+nfqnl_rcv_nl_event(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ struct netlink_notify *n = ptr;
+
+ if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
+ int i;
+
+ /* destroy all instances for this pid */
+ spin_lock(&instances_lock);
+ for (i = 0; i < INSTANCE_BUCKETS; i++) {
+ struct hlist_node *tmp, *t2;
+ struct nfqnl_instance *inst;
+ struct hlist_head *head = &instance_table[i];
+
+ hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) {
+ if ((n->net == &init_net) &&
+ (n->pid == inst->peer_pid))
+ __instance_destroy(inst);
+ }
+ }
+ spin_unlock(&instances_lock);
+ }
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block nfqnl_rtnl_notifier = {
+ .notifier_call = nfqnl_rcv_nl_event,
+};
+
+static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
+ [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
+ [NFQA_MARK] = { .type = NLA_U32 },
+ [NFQA_PAYLOAD] = { .type = NLA_UNSPEC },
+ [NFQA_CT] = { .type = NLA_UNSPEC },
+};
+
+static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
+ [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
+ [NFQA_MARK] = { .type = NLA_U32 },
+};
+
+static struct nfqnl_instance *verdict_instance_lookup(u16 queue_num, int nlpid)
+{
+ struct nfqnl_instance *queue;
+
+ queue = instance_lookup(queue_num);
+ if (!queue)
+ return ERR_PTR(-ENODEV);
+
+ if (queue->peer_pid != nlpid)
+ return ERR_PTR(-EPERM);
+
+ return queue;
+}
+
+static struct nfqnl_msg_verdict_hdr*
+verdicthdr_get(const struct nlattr * const nfqa[])
+{
+ struct nfqnl_msg_verdict_hdr *vhdr;
+ unsigned int verdict;
+
+ if (!nfqa[NFQA_VERDICT_HDR])
+ return NULL;
+
+ vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
+ verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
+ if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
+ return NULL;
+ return vhdr;
+}
+
+static int nfq_id_after(unsigned int id, unsigned int max)
+{
+ return (int)(id - max) > 0;
+}
+
+static int
+nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb,
+ const struct nlmsghdr *nlh,
+ const struct nlattr * const nfqa[])
+{
+ struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
+ struct nf_queue_entry *entry, *tmp;
+ unsigned int verdict, maxid;
+ struct nfqnl_msg_verdict_hdr *vhdr;
+ struct nfqnl_instance *queue;
+ LIST_HEAD(batch_list);
+ u16 queue_num = ntohs(nfmsg->res_id);
+
+ queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).pid);
+ if (IS_ERR(queue))
+ return PTR_ERR(queue);
+
+ vhdr = verdicthdr_get(nfqa);
+ if (!vhdr)
+ return -EINVAL;
+
+ verdict = ntohl(vhdr->verdict);
+ maxid = ntohl(vhdr->id);
+
+ spin_lock_bh(&queue->lock);
+
+ list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
+ if (nfq_id_after(entry->id, maxid))
+ break;
+ __dequeue_entry(queue, entry);
+ list_add_tail(&entry->list, &batch_list);
+ }
+
+ spin_unlock_bh(&queue->lock);
+
+ if (list_empty(&batch_list))
+ return -ENOENT;
+
+ list_for_each_entry_safe(entry, tmp, &batch_list, list) {
+ if (nfqa[NFQA_MARK])
+ entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
+ nf_reinject(entry, verdict);
+ }
+ return 0;
+}
+
+static int
+nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
+ const struct nlmsghdr *nlh,
+ const struct nlattr * const nfqa[])
+{
+ struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
+ u_int16_t queue_num = ntohs(nfmsg->res_id);
+
+ struct nfqnl_msg_verdict_hdr *vhdr;
+ struct nfqnl_instance *queue;
+ unsigned int verdict;
+ struct nf_queue_entry *entry;
+ enum ip_conntrack_info uninitialized_var(ctinfo);
+ struct nf_conn *ct = NULL;
+
+ queue = instance_lookup(queue_num);
+ if (!queue)
+
+ queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).pid);
+ if (IS_ERR(queue))
+ return PTR_ERR(queue);
+
+ vhdr = verdicthdr_get(nfqa);
+ if (!vhdr)
+ return -EINVAL;
+
+ verdict = ntohl(vhdr->verdict);
+
+ entry = find_dequeue_entry(queue, ntohl(vhdr->id));
+ if (entry == NULL)
+ return -ENOENT;
+
+ rcu_read_lock();
+ if (nfqa[NFQA_CT] && (queue->flags & NFQA_CFG_F_CONNTRACK))
+ ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo);
+
+ if (nfqa[NFQA_PAYLOAD]) {
+ u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
+ int diff = payload_len - entry->skb->len;
+
+ if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
+ payload_len, entry, diff) < 0)
+ verdict = NF_DROP;
+
+ if (ct)
+ nfqnl_ct_seq_adjust(skb, ct, ctinfo, diff);
+ }
+ rcu_read_unlock();
+
+ if (nfqa[NFQA_MARK])
+ entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
+
+ nf_reinject(entry, verdict);
+ return 0;
+}
+
+static int
+nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
+ const struct nlmsghdr *nlh,
+ const struct nlattr * const nfqa[])
+{
+ return -ENOTSUPP;
+}
+
+static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
+ [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) },
+ [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) },
+};
+
+static const struct nf_queue_handler nfqh = {
+ .name = "nf_queue",
+ .outfn = &nfqnl_enqueue_packet,
+};
+
+static int
+nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
+ const struct nlmsghdr *nlh,
+ const struct nlattr * const nfqa[])
+{
+ struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
+ u_int16_t queue_num = ntohs(nfmsg->res_id);
+ struct nfqnl_instance *queue;
+ struct nfqnl_msg_config_cmd *cmd = NULL;
+ int ret = 0;
+
+ if (nfqa[NFQA_CFG_CMD]) {
+ cmd = nla_data(nfqa[NFQA_CFG_CMD]);
+
+ /* Commands without queue context - might sleep */
+ switch (cmd->command) {
+ case NFQNL_CFG_CMD_PF_BIND:
+ return nf_register_queue_handler(ntohs(cmd->pf),
+ &nfqh);
+ case NFQNL_CFG_CMD_PF_UNBIND:
+ return nf_unregister_queue_handler(ntohs(cmd->pf),
+ &nfqh);
+ }
+ }
+
+ rcu_read_lock();
+ queue = instance_lookup(queue_num);
+ if (queue && queue->peer_pid != NETLINK_CB(skb).pid) {
+ ret = -EPERM;
+ goto err_out_unlock;
+ }
+
+ if (cmd != NULL) {
+ switch (cmd->command) {
+ case NFQNL_CFG_CMD_BIND:
+ if (queue) {
+ ret = -EBUSY;
+ goto err_out_unlock;
+ }
+ queue = instance_create(queue_num, NETLINK_CB(skb).pid);
+ if (IS_ERR(queue)) {
+ ret = PTR_ERR(queue);
+ goto err_out_unlock;
+ }
+ break;
+ case NFQNL_CFG_CMD_UNBIND:
+ if (!queue) {
+ ret = -ENODEV;
+ goto err_out_unlock;
+ }
+ instance_destroy(queue);
+ break;
+ case NFQNL_CFG_CMD_PF_BIND:
+ case NFQNL_CFG_CMD_PF_UNBIND:
+ break;
+ default:
+ ret = -ENOTSUPP;
+ break;
+ }
+ }
+
+ if (nfqa[NFQA_CFG_PARAMS]) {
+ struct nfqnl_msg_config_params *params;
+
+ if (!queue) {
+ ret = -ENODEV;
+ goto err_out_unlock;
+ }
+ params = nla_data(nfqa[NFQA_CFG_PARAMS]);
+ nfqnl_set_mode(queue, params->copy_mode,
+ ntohl(params->copy_range));
+ }
+
+ if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
+ __be32 *queue_maxlen;
+
+ if (!queue) {
+ ret = -ENODEV;
+ goto err_out_unlock;
+ }
+ queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
+ spin_lock_bh(&queue->lock);
+ queue->queue_maxlen = ntohl(*queue_maxlen);
+ spin_unlock_bh(&queue->lock);
+ }
+
+ if (nfqa[NFQA_CFG_FLAGS]) {
+ __u32 flags, mask;
+
+ if (!queue) {
+ ret = -ENODEV;
+ goto err_out_unlock;
+ }
+
+ if (!nfqa[NFQA_CFG_MASK]) {
+ /* A mask is needed to specify which flags are being
+ * changed.
+ */
+ ret = -EINVAL;
+ goto err_out_unlock;
+ }
+
+ flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
+ mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
+
+ spin_lock_bh(&queue->lock);
+ queue->flags &= ~mask;
+ queue->flags |= flags & mask;
+ spin_unlock_bh(&queue->lock);
+ }
+
+err_out_unlock:
+ rcu_read_unlock();
+ return ret;
+}
+
+static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
+ [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp,
+ .attr_count = NFQA_MAX, },
+ [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict,
+ .attr_count = NFQA_MAX,
+ .policy = nfqa_verdict_policy },
+ [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config,
+ .attr_count = NFQA_CFG_MAX,
+ .policy = nfqa_cfg_policy },
+ [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch,
+ .attr_count = NFQA_MAX,
+ .policy = nfqa_verdict_batch_policy },
+};
+
+static const struct nfnetlink_subsystem nfqnl_subsys = {
+ .name = "nf_queue",
+ .subsys_id = NFNL_SUBSYS_QUEUE,
+ .cb_count = NFQNL_MSG_MAX,
+ .cb = nfqnl_cb,
+};
+
+#ifdef CONFIG_PROC_FS
+struct iter_state {
+ unsigned int bucket;
+};
+
+static struct hlist_node *get_first(struct seq_file *seq)
+{
+ struct iter_state *st = seq->private;
+
+ if (!st)
+ return NULL;
+
+ for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
+ if (!hlist_empty(&instance_table[st->bucket]))
+ return instance_table[st->bucket].first;
+ }
+ return NULL;
+}
+
+static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
+{
+ struct iter_state *st = seq->private;
+
+ h = h->next;
+ while (!h) {
+ if (++st->bucket >= INSTANCE_BUCKETS)
+ return NULL;
+
+ h = instance_table[st->bucket].first;
+ }
+ return h;
+}
+
+static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
+{
+ struct hlist_node *head;
+ head = get_first(seq);
+
+ if (head)
+ while (pos && (head = get_next(seq, head)))
+ pos--;
+ return pos ? NULL : head;
+}
+
+static void *seq_start(struct seq_file *seq, loff_t *pos)
+ __acquires(instances_lock)
+{
+ spin_lock(&instances_lock);
+ return get_idx(seq, *pos);
+}
+
+static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ (*pos)++;
+ return get_next(s, v);
+}
+
+static void seq_stop(struct seq_file *s, void *v)
+ __releases(instances_lock)
+{
+ spin_unlock(&instances_lock);
+}
+
+static int seq_show(struct seq_file *s, void *v)
+{
+ const struct nfqnl_instance *inst = v;
+
+ return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
+ inst->queue_num,
+ inst->peer_pid, inst->queue_total,
+ inst->copy_mode, inst->copy_range,
+ inst->queue_dropped, inst->queue_user_dropped,
+ inst->id_sequence, 1);
+}
+
+static const struct seq_operations nfqnl_seq_ops = {
+ .start = seq_start,
+ .next = seq_next,
+ .stop = seq_stop,
+ .show = seq_show,
+};
+
+static int nfqnl_open(struct inode *inode, struct file *file)
+{
+ return seq_open_private(file, &nfqnl_seq_ops,
+ sizeof(struct iter_state));
+}
+
+static const struct file_operations nfqnl_file_ops = {
+ .owner = THIS_MODULE,
+ .open = nfqnl_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_private,
+};
+
+#endif /* PROC_FS */
+
+static int __init nfnetlink_queue_init(void)
+{
+ int i, status = -ENOMEM;
+
+ for (i = 0; i < INSTANCE_BUCKETS; i++)
+ INIT_HLIST_HEAD(&instance_table[i]);
+
+ netlink_register_notifier(&nfqnl_rtnl_notifier);
+ status = nfnetlink_subsys_register(&nfqnl_subsys);
+ if (status < 0) {
+ printk(KERN_ERR "nf_queue: failed to create netlink socket\n");
+ goto cleanup_netlink_notifier;
+ }
+
+#ifdef CONFIG_PROC_FS
+ if (!proc_create("nfnetlink_queue", 0440,
+ proc_net_netfilter, &nfqnl_file_ops))
+ goto cleanup_subsys;
+#endif
+
+ register_netdevice_notifier(&nfqnl_dev_notifier);
+ return status;
+
+#ifdef CONFIG_PROC_FS
+cleanup_subsys:
+ nfnetlink_subsys_unregister(&nfqnl_subsys);
+#endif
+cleanup_netlink_notifier:
+ netlink_unregister_notifier(&nfqnl_rtnl_notifier);
+ return status;
+}
+
+static void __exit nfnetlink_queue_fini(void)
+{
+ nf_unregister_queue_handlers(&nfqh);
+ unregister_netdevice_notifier(&nfqnl_dev_notifier);
+#ifdef CONFIG_PROC_FS
+ remove_proc_entry("nfnetlink_queue", proc_net_netfilter);
+#endif
+ nfnetlink_subsys_unregister(&nfqnl_subsys);
+ netlink_unregister_notifier(&nfqnl_rtnl_notifier);
+
+ rcu_barrier(); /* Wait for completion of call_rcu()'s */
+}
+
+MODULE_DESCRIPTION("netfilter packet queue handler");
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
+
+module_init(nfnetlink_queue_init);
+module_exit(nfnetlink_queue_fini);
--- /dev/null
+/*
+ * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * 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/skbuff.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nfnetlink_queue.h>
+#include <net/netfilter/nf_conntrack.h>
+
+struct nf_conn *nfqnl_ct_get(struct sk_buff *entskb, size_t *size,
+ enum ip_conntrack_info *ctinfo)
+{
+ struct nfq_ct_hook *nfq_ct;
+ struct nf_conn *ct;
+
+ /* rcu_read_lock()ed by __nf_queue already. */
+ nfq_ct = rcu_dereference(nfq_ct_hook);
+ if (nfq_ct == NULL)
+ return NULL;
+
+ ct = nf_ct_get(entskb, ctinfo);
+ if (ct) {
+ if (!nf_ct_is_untracked(ct))
+ *size += nfq_ct->build_size(ct);
+ else
+ ct = NULL;
+ }
+ return ct;
+}
+
+struct nf_conn *
+nfqnl_ct_parse(const struct sk_buff *skb, const struct nlattr *attr,
+ enum ip_conntrack_info *ctinfo)
+{
+ struct nfq_ct_hook *nfq_ct;
+ struct nf_conn *ct;
+
+ /* rcu_read_lock()ed by __nf_queue already. */
+ nfq_ct = rcu_dereference(nfq_ct_hook);
+ if (nfq_ct == NULL)
+ return NULL;
+
+ ct = nf_ct_get(skb, ctinfo);
+ if (ct && !nf_ct_is_untracked(ct))
+ nfq_ct->parse(attr, ct);
+
+ return ct;
+}
+
+int nfqnl_ct_put(struct sk_buff *skb, struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo)
+{
+ struct nfq_ct_hook *nfq_ct;
+ struct nlattr *nest_parms;
+ u_int32_t tmp;
+
+ nfq_ct = rcu_dereference(nfq_ct_hook);
+ if (nfq_ct == NULL)
+ return 0;
+
+ nest_parms = nla_nest_start(skb, NFQA_CT | NLA_F_NESTED);
+ if (!nest_parms)
+ goto nla_put_failure;
+
+ if (nfq_ct->build(skb, ct) < 0)
+ goto nla_put_failure;
+
+ nla_nest_end(skb, nest_parms);
+
+ tmp = ctinfo;
+ if (nla_put_be32(skb, NFQA_CT_INFO, htonl(tmp)))
+ goto nla_put_failure;
+
+ return 0;
+
+nla_put_failure:
+ return -1;
+}
+
+void nfqnl_ct_seq_adjust(struct sk_buff *skb, struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo, int diff)
+{
+ struct nfq_ct_hook *nfq_ct;
+
+ nfq_ct = rcu_dereference(nfq_ct_hook);
+ if (nfq_ct == NULL)
+ return;
+
+ if ((ct->status & IPS_NAT_MASK) && diff)
+ nfq_ct->seq_adjust(skb, ct, ctinfo, diff);
+}
projects / deliverable / linux.git / commitdiff
