// SPDX-License-Identifier: GPL-2.0-only
|
/*
|
* 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>
|
*/
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
#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_bridge.h>
|
#include <linux/netfilter/nfnetlink.h>
|
#include <linux/netfilter/nfnetlink_queue.h>
|
#include <linux/netfilter/nf_conntrack_common.h>
|
#include <linux/list.h>
|
#include <net/sock.h>
|
#include <net/tcp_states.h>
|
#include <net/netfilter/nf_queue.h>
|
#include <net/netns/generic.h>
|
|
#include <linux/atomic.h>
|
|
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
|
#include "../bridge/br_private.h"
|
#endif
|
|
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
|
#include <net/netfilter/nf_conntrack.h>
|
#endif
|
|
#define NFQNL_QMAX_DEFAULT 1024
|
|
/* We're using struct nlattr which has 16bit nla_len. Note that nla_len
|
* includes the header length. Thus, the maximum packet length that we
|
* support is 65531 bytes. We send truncated packets if the specified length
|
* is larger than that. Userspace can check for presence of NFQA_CAP_LEN
|
* attribute to detect truncation.
|
*/
|
#define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN)
|
|
struct nfqnl_instance {
|
struct hlist_node hlist; /* global list of queues */
|
struct rcu_head rcu;
|
|
u32 peer_portid;
|
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 ____cacheline_aligned_in_smp;
|
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 unsigned int nfnl_queue_net_id __read_mostly;
|
|
#define INSTANCE_BUCKETS 16
|
struct nfnl_queue_net {
|
spinlock_t instances_lock;
|
struct hlist_head instance_table[INSTANCE_BUCKETS];
|
};
|
|
static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net)
|
{
|
return net_generic(net, nfnl_queue_net_id);
|
}
|
|
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(struct nfnl_queue_net *q, u_int16_t queue_num)
|
{
|
struct hlist_head *head;
|
struct nfqnl_instance *inst;
|
|
head = &q->instance_table[instance_hashfn(queue_num)];
|
hlist_for_each_entry_rcu(inst, head, hlist) {
|
if (inst->queue_num == queue_num)
|
return inst;
|
}
|
return NULL;
|
}
|
|
static struct nfqnl_instance *
|
instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, u32 portid)
|
{
|
struct nfqnl_instance *inst;
|
unsigned int h;
|
int err;
|
|
spin_lock(&q->instances_lock);
|
if (instance_lookup(q, 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_portid = portid;
|
inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
|
inst->copy_range = NFQNL_MAX_COPY_RANGE;
|
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, &q->instance_table[h]);
|
|
spin_unlock(&q->instances_lock);
|
|
return inst;
|
|
out_free:
|
kfree(inst);
|
out_unlock:
|
spin_unlock(&q->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 nfnl_queue_net *q, struct nfqnl_instance *inst)
|
{
|
spin_lock(&q->instances_lock);
|
__instance_destroy(inst);
|
spin_unlock(&q->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_reinject(struct nf_queue_entry *entry, unsigned int verdict)
|
{
|
struct nf_ct_hook *ct_hook;
|
int err;
|
|
if (verdict == NF_ACCEPT ||
|
verdict == NF_REPEAT ||
|
verdict == NF_STOP) {
|
rcu_read_lock();
|
ct_hook = rcu_dereference(nf_ct_hook);
|
if (ct_hook) {
|
err = ct_hook->update(entry->state.net, entry->skb);
|
if (err < 0)
|
verdict = NF_DROP;
|
}
|
rcu_read_unlock();
|
}
|
nf_reinject(entry, verdict);
|
}
|
|
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--;
|
nfqnl_reinject(entry, NF_DROP);
|
}
|
}
|
spin_unlock_bh(&queue->lock);
|
}
|
|
static int
|
nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet,
|
bool csum_verify)
|
{
|
__u32 flags = 0;
|
|
if (packet->ip_summed == CHECKSUM_PARTIAL)
|
flags = NFQA_SKB_CSUMNOTREADY;
|
else if (csum_verify)
|
flags = NFQA_SKB_CSUM_NOTVERIFIED;
|
|
if (skb_is_gso(packet))
|
flags |= NFQA_SKB_GSO;
|
|
return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0;
|
}
|
|
static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk)
|
{
|
const struct cred *cred;
|
|
if (!sk_fullsock(sk))
|
return 0;
|
|
read_lock_bh(&sk->sk_callback_lock);
|
if (sk->sk_socket && sk->sk_socket->file) {
|
cred = sk->sk_socket->file->f_cred;
|
if (nla_put_be32(skb, NFQA_UID,
|
htonl(from_kuid_munged(&init_user_ns, cred->fsuid))))
|
goto nla_put_failure;
|
if (nla_put_be32(skb, NFQA_GID,
|
htonl(from_kgid_munged(&init_user_ns, cred->fsgid))))
|
goto nla_put_failure;
|
}
|
read_unlock_bh(&sk->sk_callback_lock);
|
return 0;
|
|
nla_put_failure:
|
read_unlock_bh(&sk->sk_callback_lock);
|
return -1;
|
}
|
|
static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
|
{
|
u32 seclen = 0;
|
#if IS_ENABLED(CONFIG_NETWORK_SECMARK)
|
if (!skb || !sk_fullsock(skb->sk))
|
return 0;
|
|
read_lock_bh(&skb->sk->sk_callback_lock);
|
|
if (skb->secmark)
|
security_secid_to_secctx(skb->secmark, secdata, &seclen);
|
|
read_unlock_bh(&skb->sk->sk_callback_lock);
|
#endif
|
return seclen;
|
}
|
|
static u32 nfqnl_get_bridge_size(struct nf_queue_entry *entry)
|
{
|
struct sk_buff *entskb = entry->skb;
|
u32 nlalen = 0;
|
|
if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb))
|
return 0;
|
|
if (skb_vlan_tag_present(entskb))
|
nlalen += nla_total_size(nla_total_size(sizeof(__be16)) +
|
nla_total_size(sizeof(__be16)));
|
|
if (entskb->network_header > entskb->mac_header)
|
nlalen += nla_total_size((entskb->network_header -
|
entskb->mac_header));
|
|
return nlalen;
|
}
|
|
static int nfqnl_put_bridge(struct nf_queue_entry *entry, struct sk_buff *skb)
|
{
|
struct sk_buff *entskb = entry->skb;
|
|
if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb))
|
return 0;
|
|
if (skb_vlan_tag_present(entskb)) {
|
struct nlattr *nest;
|
|
nest = nla_nest_start(skb, NFQA_VLAN);
|
if (!nest)
|
goto nla_put_failure;
|
|
if (nla_put_be16(skb, NFQA_VLAN_TCI, htons(entskb->vlan_tci)) ||
|
nla_put_be16(skb, NFQA_VLAN_PROTO, entskb->vlan_proto))
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest);
|
}
|
|
if (entskb->mac_header < entskb->network_header) {
|
int len = (int)(entskb->network_header - entskb->mac_header);
|
|
if (nla_put(skb, NFQA_L2HDR, len, skb_mac_header(entskb)))
|
goto nla_put_failure;
|
}
|
|
return 0;
|
|
nla_put_failure:
|
return -1;
|
}
|
|
static struct sk_buff *
|
nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
|
struct nf_queue_entry *entry,
|
__be32 **packet_id_ptr)
|
{
|
size_t size;
|
size_t data_len = 0, cap_len = 0;
|
unsigned int hlen = 0;
|
struct sk_buff *skb;
|
struct nlattr *nla;
|
struct nfqnl_msg_packet_hdr *pmsg;
|
struct nlmsghdr *nlh;
|
struct sk_buff *entskb = entry->skb;
|
struct net_device *indev;
|
struct net_device *outdev;
|
struct nf_conn *ct = NULL;
|
enum ip_conntrack_info ctinfo;
|
struct nfnl_ct_hook *nfnl_ct;
|
bool csum_verify;
|
char *secdata = NULL;
|
u32 seclen = 0;
|
|
size = nlmsg_total_size(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 */
|
#if IS_ENABLED(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(u_int32_t)) /* skbinfo */
|
+ nla_total_size(sizeof(u_int32_t)); /* cap_len */
|
|
if (entskb->tstamp)
|
size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
|
|
size += nfqnl_get_bridge_size(entry);
|
|
if (entry->state.hook <= NF_INET_FORWARD ||
|
(entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL))
|
csum_verify = !skb_csum_unnecessary(entskb);
|
else
|
csum_verify = false;
|
|
outdev = entry->state.out;
|
|
switch ((enum nfqnl_config_mode)READ_ONCE(queue->copy_mode)) {
|
case NFQNL_COPY_META:
|
case NFQNL_COPY_NONE:
|
break;
|
|
case NFQNL_COPY_PACKET:
|
if (!(queue->flags & NFQA_CFG_F_GSO) &&
|
entskb->ip_summed == CHECKSUM_PARTIAL &&
|
skb_checksum_help(entskb))
|
return NULL;
|
|
data_len = READ_ONCE(queue->copy_range);
|
if (data_len > entskb->len)
|
data_len = entskb->len;
|
|
hlen = skb_zerocopy_headlen(entskb);
|
hlen = min_t(unsigned int, hlen, data_len);
|
size += sizeof(struct nlattr) + hlen;
|
cap_len = entskb->len;
|
break;
|
}
|
|
nfnl_ct = rcu_dereference(nfnl_ct_hook);
|
|
if (queue->flags & NFQA_CFG_F_CONNTRACK) {
|
if (nfnl_ct != NULL) {
|
ct = nfnl_ct->get_ct(entskb, &ctinfo);
|
if (ct != NULL)
|
size += nfnl_ct->build_size(ct);
|
}
|
}
|
|
if (queue->flags & NFQA_CFG_F_UID_GID) {
|
size += (nla_total_size(sizeof(u_int32_t)) /* uid */
|
+ nla_total_size(sizeof(u_int32_t))); /* gid */
|
}
|
|
if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) {
|
seclen = nfqnl_get_sk_secctx(entskb, &secdata);
|
if (seclen)
|
size += nla_total_size(seclen);
|
}
|
|
skb = alloc_skb(size, GFP_ATOMIC);
|
if (!skb) {
|
skb_tx_error(entskb);
|
goto nlmsg_failure;
|
}
|
|
nlh = nfnl_msg_put(skb, 0, 0,
|
nfnl_msg_type(NFNL_SUBSYS_QUEUE, NFQNL_MSG_PACKET),
|
0, entry->state.pf, NFNETLINK_V0,
|
htons(queue->queue_num));
|
if (!nlh) {
|
skb_tx_error(entskb);
|
kfree_skb(skb);
|
goto nlmsg_failure;
|
}
|
|
nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg));
|
pmsg = nla_data(nla);
|
pmsg->hw_protocol = entskb->protocol;
|
pmsg->hook = entry->state.hook;
|
*packet_id_ptr = &pmsg->packet_id;
|
|
indev = entry->state.in;
|
if (indev) {
|
#if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
|
if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)))
|
goto nla_put_failure;
|
#else
|
if (entry->state.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 {
|
int physinif;
|
|
/* 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;
|
|
physinif = nf_bridge_get_physinif(entskb);
|
if (physinif &&
|
nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
|
htonl(physinif)))
|
goto nla_put_failure;
|
}
|
#endif
|
}
|
|
if (outdev) {
|
#if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
|
if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)))
|
goto nla_put_failure;
|
#else
|
if (entry->state.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 {
|
int physoutif;
|
|
/* 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;
|
|
physoutif = nf_bridge_get_physoutif(entskb);
|
if (physoutif &&
|
nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
|
htonl(physoutif)))
|
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 &&
|
skb_mac_header_was_set(entskb) &&
|
skb_mac_header_len(entskb) != 0) {
|
struct nfqnl_msg_packet_hw phw;
|
int len;
|
|
memset(&phw, 0, sizeof(phw));
|
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 (nfqnl_put_bridge(entry, skb) < 0)
|
goto nla_put_failure;
|
|
if (entry->state.hook <= NF_INET_FORWARD && entskb->tstamp) {
|
struct nfqnl_msg_packet_timestamp ts;
|
struct timespec64 kts = ktime_to_timespec64(entskb->tstamp);
|
|
ts.sec = cpu_to_be64(kts.tv_sec);
|
ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC);
|
|
if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
|
goto nla_put_failure;
|
}
|
|
if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk &&
|
nfqnl_put_sk_uidgid(skb, entskb->sk) < 0)
|
goto nla_put_failure;
|
|
if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata))
|
goto nla_put_failure;
|
|
if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0)
|
goto nla_put_failure;
|
|
if (cap_len > data_len &&
|
nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len)))
|
goto nla_put_failure;
|
|
if (nfqnl_put_packet_info(skb, entskb, csum_verify))
|
goto nla_put_failure;
|
|
if (data_len) {
|
struct nlattr *nla;
|
|
if (skb_tailroom(skb) < sizeof(*nla) + hlen)
|
goto nla_put_failure;
|
|
nla = skb_put(skb, sizeof(*nla));
|
nla->nla_type = NFQA_PAYLOAD;
|
nla->nla_len = nla_attr_size(data_len);
|
|
if (skb_zerocopy(skb, entskb, data_len, hlen))
|
goto nla_put_failure;
|
}
|
|
nlh->nlmsg_len = skb->len;
|
if (seclen)
|
security_release_secctx(secdata, seclen);
|
return skb;
|
|
nla_put_failure:
|
skb_tx_error(entskb);
|
kfree_skb(skb);
|
net_err_ratelimited("nf_queue: error creating packet message\n");
|
nlmsg_failure:
|
if (seclen)
|
security_release_secctx(secdata, seclen);
|
return NULL;
|
}
|
|
static bool nf_ct_drop_unconfirmed(const struct nf_queue_entry *entry)
|
{
|
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
|
static const unsigned long flags = IPS_CONFIRMED | IPS_DYING;
|
const struct nf_conn *ct = (void *)skb_nfct(entry->skb);
|
|
if (ct && ((ct->status & flags) == IPS_DYING))
|
return true;
|
#endif
|
return false;
|
}
|
|
static int
|
__nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue,
|
struct nf_queue_entry *entry)
|
{
|
struct sk_buff *nskb;
|
int err = -ENOBUFS;
|
__be32 *packet_id_ptr;
|
int failopen = 0;
|
|
nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr);
|
if (nskb == NULL) {
|
err = -ENOMEM;
|
goto err_out;
|
}
|
spin_lock_bh(&queue->lock);
|
|
if (nf_ct_drop_unconfirmed(entry))
|
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, net, queue->peer_portid);
|
if (err < 0) {
|
if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
|
failopen = 1;
|
err = 0;
|
} else {
|
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)
|
nfqnl_reinject(entry, NF_ACCEPT);
|
err_out:
|
return err;
|
}
|
|
static struct nf_queue_entry *
|
nf_queue_entry_dup(struct nf_queue_entry *e)
|
{
|
struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC);
|
|
if (!entry)
|
return NULL;
|
|
if (nf_queue_entry_get_refs(entry))
|
return entry;
|
|
kfree(entry);
|
return NULL;
|
}
|
|
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
|
/* When called from bridge netfilter, skb->data must point to MAC header
|
* before calling skb_gso_segment(). Else, original MAC header is lost
|
* and segmented skbs will be sent to wrong destination.
|
*/
|
static void nf_bridge_adjust_skb_data(struct sk_buff *skb)
|
{
|
if (nf_bridge_info_get(skb))
|
__skb_push(skb, skb->network_header - skb->mac_header);
|
}
|
|
static void nf_bridge_adjust_segmented_data(struct sk_buff *skb)
|
{
|
if (nf_bridge_info_get(skb))
|
__skb_pull(skb, skb->network_header - skb->mac_header);
|
}
|
#else
|
#define nf_bridge_adjust_skb_data(s) do {} while (0)
|
#define nf_bridge_adjust_segmented_data(s) do {} while (0)
|
#endif
|
|
static int
|
__nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue,
|
struct sk_buff *skb, struct nf_queue_entry *entry)
|
{
|
int ret = -ENOMEM;
|
struct nf_queue_entry *entry_seg;
|
|
nf_bridge_adjust_segmented_data(skb);
|
|
if (skb->next == NULL) { /* last packet, no need to copy entry */
|
struct sk_buff *gso_skb = entry->skb;
|
entry->skb = skb;
|
ret = __nfqnl_enqueue_packet(net, queue, entry);
|
if (ret)
|
entry->skb = gso_skb;
|
return ret;
|
}
|
|
skb_mark_not_on_list(skb);
|
|
entry_seg = nf_queue_entry_dup(entry);
|
if (entry_seg) {
|
entry_seg->skb = skb;
|
ret = __nfqnl_enqueue_packet(net, queue, entry_seg);
|
if (ret)
|
nf_queue_entry_free(entry_seg);
|
}
|
return ret;
|
}
|
|
static int
|
nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
|
{
|
unsigned int queued;
|
struct nfqnl_instance *queue;
|
struct sk_buff *skb, *segs, *nskb;
|
int err = -ENOBUFS;
|
struct net *net = entry->state.net;
|
struct nfnl_queue_net *q = nfnl_queue_pernet(net);
|
|
/* rcu_read_lock()ed by nf_hook_thresh */
|
queue = instance_lookup(q, queuenum);
|
if (!queue)
|
return -ESRCH;
|
|
if (queue->copy_mode == NFQNL_COPY_NONE)
|
return -EINVAL;
|
|
skb = entry->skb;
|
|
switch (entry->state.pf) {
|
case NFPROTO_IPV4:
|
skb->protocol = htons(ETH_P_IP);
|
break;
|
case NFPROTO_IPV6:
|
skb->protocol = htons(ETH_P_IPV6);
|
break;
|
}
|
|
if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb))
|
return __nfqnl_enqueue_packet(net, queue, entry);
|
|
nf_bridge_adjust_skb_data(skb);
|
segs = skb_gso_segment(skb, 0);
|
/* Does not use PTR_ERR to limit the number of error codes that can be
|
* returned by nf_queue. For instance, callers rely on -ESRCH to
|
* mean 'ignore this hook'.
|
*/
|
if (IS_ERR_OR_NULL(segs))
|
goto out_err;
|
queued = 0;
|
err = 0;
|
skb_list_walk_safe(segs, segs, nskb) {
|
if (err == 0)
|
err = __nfqnl_enqueue_packet_gso(net, queue,
|
segs, entry);
|
if (err == 0)
|
queued++;
|
else
|
kfree_skb(segs);
|
}
|
|
if (queued) {
|
if (err) /* some segments are already queued */
|
nf_queue_entry_free(entry);
|
kfree_skb(skb);
|
return 0;
|
}
|
out_err:
|
nf_bridge_adjust_segmented_data(skb);
|
return err;
|
}
|
|
static int
|
nfqnl_mangle(void *data, unsigned int data_len, struct nf_queue_entry *e, int diff)
|
{
|
struct sk_buff *nskb;
|
|
if (diff < 0) {
|
unsigned int min_len = skb_transport_offset(e->skb);
|
|
if (data_len < min_len)
|
return -EINVAL;
|
|
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)
|
return -ENOMEM;
|
kfree_skb(e->skb);
|
e->skb = nskb;
|
}
|
skb_put(e->skb, diff);
|
}
|
if (skb_ensure_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;
|
if (range == 0 || range > NFQNL_MAX_COPY_RANGE)
|
queue->copy_range = NFQNL_MAX_COPY_RANGE;
|
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 IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
|
int physinif, physoutif;
|
|
physinif = nf_bridge_get_physinif(entry->skb);
|
physoutif = nf_bridge_get_physoutif(entry->skb);
|
|
if (physinif == ifindex || physoutif == ifindex)
|
return 1;
|
#endif
|
if (entry->state.in)
|
if (entry->state.in->ifindex == ifindex)
|
return 1;
|
if (entry->state.out)
|
if (entry->state.out->ifindex == ifindex)
|
return 1;
|
|
return 0;
|
}
|
|
/* drop all packets with either indev or outdev == ifindex from all queue
|
* instances */
|
static void
|
nfqnl_dev_drop(struct net *net, int ifindex)
|
{
|
int i;
|
struct nfnl_queue_net *q = nfnl_queue_pernet(net);
|
|
rcu_read_lock();
|
|
for (i = 0; i < INSTANCE_BUCKETS; i++) {
|
struct nfqnl_instance *inst;
|
struct hlist_head *head = &q->instance_table[i];
|
|
hlist_for_each_entry_rcu(inst, head, hlist)
|
nfqnl_flush(inst, dev_cmp, ifindex);
|
}
|
|
rcu_read_unlock();
|
}
|
|
static int
|
nfqnl_rcv_dev_event(struct notifier_block *this,
|
unsigned long event, void *ptr)
|
{
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
/* Drop any packets associated with the downed device */
|
if (event == NETDEV_DOWN)
|
nfqnl_dev_drop(dev_net(dev), dev->ifindex);
|
return NOTIFY_DONE;
|
}
|
|
static struct notifier_block nfqnl_dev_notifier = {
|
.notifier_call = nfqnl_rcv_dev_event,
|
};
|
|
static void nfqnl_nf_hook_drop(struct net *net)
|
{
|
struct nfnl_queue_net *q = nfnl_queue_pernet(net);
|
int i;
|
|
for (i = 0; i < INSTANCE_BUCKETS; i++) {
|
struct nfqnl_instance *inst;
|
struct hlist_head *head = &q->instance_table[i];
|
|
hlist_for_each_entry_rcu(inst, head, hlist)
|
nfqnl_flush(inst, NULL, 0);
|
}
|
}
|
|
static int
|
nfqnl_rcv_nl_event(struct notifier_block *this,
|
unsigned long event, void *ptr)
|
{
|
struct netlink_notify *n = ptr;
|
struct nfnl_queue_net *q = nfnl_queue_pernet(n->net);
|
|
if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
|
int i;
|
|
/* destroy all instances for this portid */
|
spin_lock(&q->instances_lock);
|
for (i = 0; i < INSTANCE_BUCKETS; i++) {
|
struct hlist_node *t2;
|
struct nfqnl_instance *inst;
|
struct hlist_head *head = &q->instance_table[i];
|
|
hlist_for_each_entry_safe(inst, t2, head, hlist) {
|
if (n->portid == inst->peer_portid)
|
__instance_destroy(inst);
|
}
|
}
|
spin_unlock(&q->instances_lock);
|
}
|
return NOTIFY_DONE;
|
}
|
|
static struct notifier_block nfqnl_rtnl_notifier = {
|
.notifier_call = nfqnl_rcv_nl_event,
|
};
|
|
static const struct nla_policy nfqa_vlan_policy[NFQA_VLAN_MAX + 1] = {
|
[NFQA_VLAN_TCI] = { .type = NLA_U16},
|
[NFQA_VLAN_PROTO] = { .type = NLA_U16},
|
};
|
|
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 },
|
[NFQA_EXP] = { .type = NLA_UNSPEC },
|
[NFQA_VLAN] = { .type = NLA_NESTED },
|
};
|
|
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(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid)
|
{
|
struct nfqnl_instance *queue;
|
|
queue = instance_lookup(q, queue_num);
|
if (!queue)
|
return ERR_PTR(-ENODEV);
|
|
if (queue->peer_portid != nlportid)
|
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 net *net, struct sock *ctnl,
|
struct sk_buff *skb,
|
const struct nlmsghdr *nlh,
|
const struct nlattr * const nfqa[],
|
struct netlink_ext_ack *extack)
|
{
|
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);
|
struct nfnl_queue_net *q = nfnl_queue_pernet(net);
|
|
queue = verdict_instance_lookup(q, queue_num,
|
NETLINK_CB(skb).portid);
|
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]));
|
|
nfqnl_reinject(entry, verdict);
|
}
|
return 0;
|
}
|
|
static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct,
|
const struct nlmsghdr *nlh,
|
const struct nlattr * const nfqa[],
|
struct nf_queue_entry *entry,
|
enum ip_conntrack_info *ctinfo)
|
{
|
struct nf_conn *ct;
|
|
ct = nfnl_ct->get_ct(entry->skb, ctinfo);
|
if (ct == NULL)
|
return NULL;
|
|
if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0)
|
return NULL;
|
|
if (nfqa[NFQA_EXP])
|
nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct,
|
NETLINK_CB(entry->skb).portid,
|
nlmsg_report(nlh));
|
return ct;
|
}
|
|
static int nfqa_parse_bridge(struct nf_queue_entry *entry,
|
const struct nlattr * const nfqa[])
|
{
|
if (nfqa[NFQA_VLAN]) {
|
struct nlattr *tb[NFQA_VLAN_MAX + 1];
|
int err;
|
|
err = nla_parse_nested_deprecated(tb, NFQA_VLAN_MAX,
|
nfqa[NFQA_VLAN],
|
nfqa_vlan_policy, NULL);
|
if (err < 0)
|
return err;
|
|
if (!tb[NFQA_VLAN_TCI] || !tb[NFQA_VLAN_PROTO])
|
return -EINVAL;
|
|
__vlan_hwaccel_put_tag(entry->skb,
|
nla_get_be16(tb[NFQA_VLAN_PROTO]),
|
ntohs(nla_get_be16(tb[NFQA_VLAN_TCI])));
|
}
|
|
if (nfqa[NFQA_L2HDR]) {
|
int mac_header_len = entry->skb->network_header -
|
entry->skb->mac_header;
|
|
if (mac_header_len != nla_len(nfqa[NFQA_L2HDR]))
|
return -EINVAL;
|
else if (mac_header_len > 0)
|
memcpy(skb_mac_header(entry->skb),
|
nla_data(nfqa[NFQA_L2HDR]),
|
mac_header_len);
|
}
|
|
return 0;
|
}
|
|
static int nfqnl_recv_verdict(struct net *net, struct sock *ctnl,
|
struct sk_buff *skb,
|
const struct nlmsghdr *nlh,
|
const struct nlattr * const nfqa[],
|
struct netlink_ext_ack *extack)
|
{
|
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 ctinfo;
|
struct nfnl_ct_hook *nfnl_ct;
|
struct nf_conn *ct = NULL;
|
struct nfnl_queue_net *q = nfnl_queue_pernet(net);
|
int err;
|
|
queue = verdict_instance_lookup(q, queue_num,
|
NETLINK_CB(skb).portid);
|
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 lock already held from nfnl->call_rcu. */
|
nfnl_ct = rcu_dereference(nfnl_ct_hook);
|
|
if (nfqa[NFQA_CT]) {
|
if (nfnl_ct != NULL)
|
ct = nfqnl_ct_parse(nfnl_ct, nlh, nfqa, entry, &ctinfo);
|
}
|
|
if (entry->state.pf == PF_BRIDGE) {
|
err = nfqa_parse_bridge(entry, nfqa);
|
if (err < 0)
|
return err;
|
}
|
|
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 && diff)
|
nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff);
|
}
|
|
if (nfqa[NFQA_MARK])
|
entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
|
|
nfqnl_reinject(entry, verdict);
|
return 0;
|
}
|
|
static int nfqnl_recv_unsupp(struct net *net, struct sock *ctnl,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const nfqa[],
|
struct netlink_ext_ack *extack)
|
{
|
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) },
|
[NFQA_CFG_QUEUE_MAXLEN] = { .type = NLA_U32 },
|
[NFQA_CFG_MASK] = { .type = NLA_U32 },
|
[NFQA_CFG_FLAGS] = { .type = NLA_U32 },
|
};
|
|
static const struct nf_queue_handler nfqh = {
|
.outfn = nfqnl_enqueue_packet,
|
.nf_hook_drop = nfqnl_nf_hook_drop,
|
};
|
|
static int nfqnl_recv_config(struct net *net, struct sock *ctnl,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const nfqa[],
|
struct netlink_ext_ack *extack)
|
{
|
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;
|
struct nfnl_queue_net *q = nfnl_queue_pernet(net);
|
__u32 flags = 0, mask = 0;
|
int ret = 0;
|
|
if (nfqa[NFQA_CFG_CMD]) {
|
cmd = nla_data(nfqa[NFQA_CFG_CMD]);
|
|
/* Obsolete commands without queue context */
|
switch (cmd->command) {
|
case NFQNL_CFG_CMD_PF_BIND: return 0;
|
case NFQNL_CFG_CMD_PF_UNBIND: return 0;
|
}
|
}
|
|
/* Check if we support these flags in first place, dependencies should
|
* be there too not to break atomicity.
|
*/
|
if (nfqa[NFQA_CFG_FLAGS]) {
|
if (!nfqa[NFQA_CFG_MASK]) {
|
/* A mask is needed to specify which flags are being
|
* changed.
|
*/
|
return -EINVAL;
|
}
|
|
flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
|
mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
|
|
if (flags >= NFQA_CFG_F_MAX)
|
return -EOPNOTSUPP;
|
|
#if !IS_ENABLED(CONFIG_NETWORK_SECMARK)
|
if (flags & mask & NFQA_CFG_F_SECCTX)
|
return -EOPNOTSUPP;
|
#endif
|
if ((flags & mask & NFQA_CFG_F_CONNTRACK) &&
|
!rcu_access_pointer(nfnl_ct_hook)) {
|
#ifdef CONFIG_MODULES
|
nfnl_unlock(NFNL_SUBSYS_QUEUE);
|
request_module("ip_conntrack_netlink");
|
nfnl_lock(NFNL_SUBSYS_QUEUE);
|
if (rcu_access_pointer(nfnl_ct_hook))
|
return -EAGAIN;
|
#endif
|
return -EOPNOTSUPP;
|
}
|
}
|
|
rcu_read_lock();
|
queue = instance_lookup(q, queue_num);
|
if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
|
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(q, queue_num,
|
NETLINK_CB(skb).portid);
|
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(q, queue);
|
goto err_out_unlock;
|
case NFQNL_CFG_CMD_PF_BIND:
|
case NFQNL_CFG_CMD_PF_UNBIND:
|
break;
|
default:
|
ret = -ENOTSUPP;
|
goto err_out_unlock;
|
}
|
}
|
|
if (!queue) {
|
ret = -ENODEV;
|
goto err_out_unlock;
|
}
|
|
if (nfqa[NFQA_CFG_PARAMS]) {
|
struct nfqnl_msg_config_params *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 = 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]) {
|
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 {
|
struct seq_net_private p;
|
unsigned int bucket;
|
};
|
|
static struct hlist_node *get_first(struct seq_file *seq)
|
{
|
struct iter_state *st = seq->private;
|
struct net *net;
|
struct nfnl_queue_net *q;
|
|
if (!st)
|
return NULL;
|
|
net = seq_file_net(seq);
|
q = nfnl_queue_pernet(net);
|
for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
|
if (!hlist_empty(&q->instance_table[st->bucket]))
|
return q->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;
|
struct net *net = seq_file_net(seq);
|
|
h = h->next;
|
while (!h) {
|
struct nfnl_queue_net *q;
|
|
if (++st->bucket >= INSTANCE_BUCKETS)
|
return NULL;
|
|
q = nfnl_queue_pernet(net);
|
h = q->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 *s, loff_t *pos)
|
__acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
|
{
|
spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
|
return get_idx(s, *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(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
|
{
|
spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
|
}
|
|
static int seq_show(struct seq_file *s, void *v)
|
{
|
const struct nfqnl_instance *inst = v;
|
|
seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n",
|
inst->queue_num,
|
inst->peer_portid, inst->queue_total,
|
inst->copy_mode, inst->copy_range,
|
inst->queue_dropped, inst->queue_user_dropped,
|
inst->id_sequence, 1);
|
return 0;
|
}
|
|
static const struct seq_operations nfqnl_seq_ops = {
|
.start = seq_start,
|
.next = seq_next,
|
.stop = seq_stop,
|
.show = seq_show,
|
};
|
#endif /* PROC_FS */
|
|
static int __net_init nfnl_queue_net_init(struct net *net)
|
{
|
unsigned int i;
|
struct nfnl_queue_net *q = nfnl_queue_pernet(net);
|
|
for (i = 0; i < INSTANCE_BUCKETS; i++)
|
INIT_HLIST_HEAD(&q->instance_table[i]);
|
|
spin_lock_init(&q->instances_lock);
|
|
#ifdef CONFIG_PROC_FS
|
if (!proc_create_net("nfnetlink_queue", 0440, net->nf.proc_netfilter,
|
&nfqnl_seq_ops, sizeof(struct iter_state)))
|
return -ENOMEM;
|
#endif
|
nf_register_queue_handler(net, &nfqh);
|
return 0;
|
}
|
|
static void __net_exit nfnl_queue_net_exit(struct net *net)
|
{
|
struct nfnl_queue_net *q = nfnl_queue_pernet(net);
|
unsigned int i;
|
|
nf_unregister_queue_handler(net);
|
#ifdef CONFIG_PROC_FS
|
remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter);
|
#endif
|
for (i = 0; i < INSTANCE_BUCKETS; i++)
|
WARN_ON_ONCE(!hlist_empty(&q->instance_table[i]));
|
}
|
|
static void nfnl_queue_net_exit_batch(struct list_head *net_exit_list)
|
{
|
synchronize_rcu();
|
}
|
|
static struct pernet_operations nfnl_queue_net_ops = {
|
.init = nfnl_queue_net_init,
|
.exit = nfnl_queue_net_exit,
|
.exit_batch = nfnl_queue_net_exit_batch,
|
.id = &nfnl_queue_net_id,
|
.size = sizeof(struct nfnl_queue_net),
|
};
|
|
static int __init nfnetlink_queue_init(void)
|
{
|
int status;
|
|
status = register_pernet_subsys(&nfnl_queue_net_ops);
|
if (status < 0) {
|
pr_err("failed to register pernet ops\n");
|
goto out;
|
}
|
|
netlink_register_notifier(&nfqnl_rtnl_notifier);
|
status = nfnetlink_subsys_register(&nfqnl_subsys);
|
if (status < 0) {
|
pr_err("failed to create netlink socket\n");
|
goto cleanup_netlink_notifier;
|
}
|
|
status = register_netdevice_notifier(&nfqnl_dev_notifier);
|
if (status < 0) {
|
pr_err("failed to register netdevice notifier\n");
|
goto cleanup_netlink_subsys;
|
}
|
|
return status;
|
|
cleanup_netlink_subsys:
|
nfnetlink_subsys_unregister(&nfqnl_subsys);
|
cleanup_netlink_notifier:
|
netlink_unregister_notifier(&nfqnl_rtnl_notifier);
|
unregister_pernet_subsys(&nfnl_queue_net_ops);
|
out:
|
return status;
|
}
|
|
static void __exit nfnetlink_queue_fini(void)
|
{
|
unregister_netdevice_notifier(&nfqnl_dev_notifier);
|
nfnetlink_subsys_unregister(&nfqnl_subsys);
|
netlink_unregister_notifier(&nfqnl_rtnl_notifier);
|
unregister_pernet_subsys(&nfnl_queue_net_ops);
|
|
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);
|
