@@ -6,7 +6,7 @@
struct nf_conn;
#ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
-struct nf_conn *nfqnl_ct_get(struct sk_buff *entskb, size_t *size,
+struct nf_conn *nfqnl_ct_get(const 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,
@@ -20,7 +20,7 @@ int nfqnl_attach_expect(struct nf_conn *ct, const struct nlattr *attr,
u32 portid, u32 report);
#else
inline struct nf_conn *
-nfqnl_ct_get(struct sk_buff *entskb, size_t *size, enum ip_conntrack_info *ctinfo)
+nfqnl_ct_get(const struct sk_buff *entskb, size_t *size, enum ip_conntrack_info *ctinfo)
{
return NULL;
}
@@ -51,6 +51,8 @@ enum nfulnl_attr_type {
NFULA_HWTYPE, /* hardware type */
NFULA_HWHEADER, /* hardware header */
NFULA_HWLEN, /* hardware header length */
+ NFULA_CT, /* nf_conntrack_netlink.h */
+ NFULA_CT_INFO, /* enum ip_conntrack_info */
__NFULA_MAX
};
@@ -93,5 +95,6 @@ enum nfulnl_attr_config {
#define NFULNL_CFG_F_SEQ 0x0001
#define NFULNL_CFG_F_SEQ_GLOBAL 0x0002
+#define NFULNL_CFG_F_CONNTRACK 0x0004
#endif /* _NFNETLINK_LOG_H */
@@ -363,12 +363,13 @@ config NF_CT_NETLINK_HELPER
If unsure, say `N'.
config NETFILTER_NETLINK_QUEUE_CT
- bool "NFQUEUE integration with Connection Tracking"
+ bool "NFQUEUE/NFLOG integration with Connection Tracking"
default n
- depends on NETFILTER_NETLINK_QUEUE
+ depends on NETFILTER_NETLINK_QUEUE || NETFILTER_NETLINK_LOG
help
- If this option is enabled, NFQUEUE can include Connection Tracking
- information together with the packet is the enqueued via NFNETLINK.
+ If this option is enabled, NFQUEUE and/or NFLOG can include
+ Connection Tracking information together with the packet is
+ enqueued, logged via NFNETLINK.
config NF_NAT
tristate
@@ -13,6 +13,8 @@ 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-$(CONFIG_NETFILTER_NETLINK_QUEUE) += nfnetlink_queue.o
+nfnetlink_log-y := nfnetlink_log_core.o
+nfnetlink_log-$(CONFIG_NETFILTER_NETLINK_QUEUE_CT) += nfnetlink_queue_ct.o
obj-$(CONFIG_NETFILTER_NETLINK_LOG) += nfnetlink_log.o
# connection tracking
deleted file mode 100644
@@ -1,1123 +0,0 @@
-/*
- * This is a module which is used for logging packets to userspace via
- * nfetlink.
- *
- * (C) 2005 by Harald Welte <laforge@netfilter.org>
- * (C) 2006-2012 Patrick McHardy <kaber@trash.net>
- *
- * Based on the old ipv4-only ipt_ULOG.c:
- * (C) 2000-2004 by Harald Welte <laforge@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.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/skbuff.h>
-#include <linux/if_arp.h>
-#include <linux/init.h>
-#include <linux/ip.h>
-#include <linux/ipv6.h>
-#include <linux/netdevice.h>
-#include <linux/netfilter.h>
-#include <linux/netfilter_bridge.h>
-#include <net/netlink.h>
-#include <linux/netfilter/nfnetlink.h>
-#include <linux/netfilter/nfnetlink_log.h>
-#include <linux/spinlock.h>
-#include <linux/sysctl.h>
-#include <linux/proc_fs.h>
-#include <linux/security.h>
-#include <linux/list.h>
-#include <linux/slab.h>
-#include <net/sock.h>
-#include <net/netfilter/nf_log.h>
-#include <net/netns/generic.h>
-#include <net/netfilter/nfnetlink_log.h>
-
-#include <linux/atomic.h>
-
-#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
-#include "../bridge/br_private.h"
-#endif
-
-#define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE
-#define NFULNL_TIMEOUT_DEFAULT 100 /* every second */
-#define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */
-/* max packet size is limited by 16-bit struct nfattr nfa_len field */
-#define NFULNL_COPY_RANGE_MAX (0xFFFF - NLA_HDRLEN)
-
-#define PRINTR(x, args...) do { if (net_ratelimit()) \
- printk(x, ## args); } while (0);
-
-struct nfulnl_instance {
- struct hlist_node hlist; /* global list of instances */
- spinlock_t lock;
- atomic_t use; /* use count */
-
- unsigned int qlen; /* number of nlmsgs in skb */
- struct sk_buff *skb; /* pre-allocatd skb */
- struct timer_list timer;
- struct net *net;
- struct user_namespace *peer_user_ns; /* User namespace of the peer process */
- u32 peer_portid; /* PORTID of the peer process */
-
- /* configurable parameters */
- unsigned int flushtimeout; /* timeout until queue flush */
- unsigned int nlbufsiz; /* netlink buffer allocation size */
- unsigned int qthreshold; /* threshold of the queue */
- u_int32_t copy_range;
- u_int32_t seq; /* instance-local sequential counter */
- u_int16_t group_num; /* number of this queue */
- u_int16_t flags;
- u_int8_t copy_mode;
- struct rcu_head rcu;
-};
-
-#define INSTANCE_BUCKETS 16
-
-static int nfnl_log_net_id __read_mostly;
-
-struct nfnl_log_net {
- spinlock_t instances_lock;
- struct hlist_head instance_table[INSTANCE_BUCKETS];
- atomic_t global_seq;
-};
-
-static struct nfnl_log_net *nfnl_log_pernet(struct net *net)
-{
- return net_generic(net, nfnl_log_net_id);
-}
-
-static inline u_int8_t instance_hashfn(u_int16_t group_num)
-{
- return ((group_num & 0xff) % INSTANCE_BUCKETS);
-}
-
-static struct nfulnl_instance *
-__instance_lookup(struct nfnl_log_net *log, u_int16_t group_num)
-{
- struct hlist_head *head;
- struct nfulnl_instance *inst;
-
- head = &log->instance_table[instance_hashfn(group_num)];
- hlist_for_each_entry_rcu(inst, head, hlist) {
- if (inst->group_num == group_num)
- return inst;
- }
- return NULL;
-}
-
-static inline void
-instance_get(struct nfulnl_instance *inst)
-{
- atomic_inc(&inst->use);
-}
-
-static struct nfulnl_instance *
-instance_lookup_get(struct nfnl_log_net *log, u_int16_t group_num)
-{
- struct nfulnl_instance *inst;
-
- rcu_read_lock_bh();
- inst = __instance_lookup(log, group_num);
- if (inst && !atomic_inc_not_zero(&inst->use))
- inst = NULL;
- rcu_read_unlock_bh();
-
- return inst;
-}
-
-static void nfulnl_instance_free_rcu(struct rcu_head *head)
-{
- struct nfulnl_instance *inst =
- container_of(head, struct nfulnl_instance, rcu);
-
- put_net(inst->net);
- kfree(inst);
- module_put(THIS_MODULE);
-}
-
-static void
-instance_put(struct nfulnl_instance *inst)
-{
- if (inst && atomic_dec_and_test(&inst->use))
- call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu);
-}
-
-static void nfulnl_timer(unsigned long data);
-
-static struct nfulnl_instance *
-instance_create(struct net *net, u_int16_t group_num,
- u32 portid, struct user_namespace *user_ns)
-{
- struct nfulnl_instance *inst;
- struct nfnl_log_net *log = nfnl_log_pernet(net);
- int err;
-
- spin_lock_bh(&log->instances_lock);
- if (__instance_lookup(log, group_num)) {
- err = -EEXIST;
- goto out_unlock;
- }
-
- inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
- if (!inst) {
- err = -ENOMEM;
- goto out_unlock;
- }
-
- if (!try_module_get(THIS_MODULE)) {
- kfree(inst);
- err = -EAGAIN;
- goto out_unlock;
- }
-
- INIT_HLIST_NODE(&inst->hlist);
- spin_lock_init(&inst->lock);
- /* needs to be two, since we _put() after creation */
- atomic_set(&inst->use, 2);
-
- setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst);
-
- inst->net = get_net(net);
- inst->peer_user_ns = user_ns;
- inst->peer_portid = portid;
- inst->group_num = group_num;
-
- inst->qthreshold = NFULNL_QTHRESH_DEFAULT;
- inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT;
- inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT;
- inst->copy_mode = NFULNL_COPY_PACKET;
- inst->copy_range = NFULNL_COPY_RANGE_MAX;
-
- hlist_add_head_rcu(&inst->hlist,
- &log->instance_table[instance_hashfn(group_num)]);
-
-
- spin_unlock_bh(&log->instances_lock);
-
- return inst;
-
-out_unlock:
- spin_unlock_bh(&log->instances_lock);
- return ERR_PTR(err);
-}
-
-static void __nfulnl_flush(struct nfulnl_instance *inst);
-
-/* called with BH disabled */
-static void
-__instance_destroy(struct nfulnl_instance *inst)
-{
- /* first pull it out of the global list */
- hlist_del_rcu(&inst->hlist);
-
- /* then flush all pending packets from skb */
-
- spin_lock(&inst->lock);
-
- /* lockless readers wont be able to use us */
- inst->copy_mode = NFULNL_COPY_DISABLED;
-
- if (inst->skb)
- __nfulnl_flush(inst);
- spin_unlock(&inst->lock);
-
- /* and finally put the refcount */
- instance_put(inst);
-}
-
-static inline void
-instance_destroy(struct nfnl_log_net *log,
- struct nfulnl_instance *inst)
-{
- spin_lock_bh(&log->instances_lock);
- __instance_destroy(inst);
- spin_unlock_bh(&log->instances_lock);
-}
-
-static int
-nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode,
- unsigned int range)
-{
- int status = 0;
-
- spin_lock_bh(&inst->lock);
-
- switch (mode) {
- case NFULNL_COPY_NONE:
- case NFULNL_COPY_META:
- inst->copy_mode = mode;
- inst->copy_range = 0;
- break;
-
- case NFULNL_COPY_PACKET:
- inst->copy_mode = mode;
- if (range == 0)
- range = NFULNL_COPY_RANGE_MAX;
- inst->copy_range = min_t(unsigned int,
- range, NFULNL_COPY_RANGE_MAX);
- break;
-
- default:
- status = -EINVAL;
- break;
- }
-
- spin_unlock_bh(&inst->lock);
-
- return status;
-}
-
-static int
-nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz)
-{
- int status;
-
- spin_lock_bh(&inst->lock);
- if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT)
- status = -ERANGE;
- else if (nlbufsiz > 131072)
- status = -ERANGE;
- else {
- inst->nlbufsiz = nlbufsiz;
- status = 0;
- }
- spin_unlock_bh(&inst->lock);
-
- return status;
-}
-
-static int
-nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout)
-{
- spin_lock_bh(&inst->lock);
- inst->flushtimeout = timeout;
- spin_unlock_bh(&inst->lock);
-
- return 0;
-}
-
-static int
-nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh)
-{
- spin_lock_bh(&inst->lock);
- inst->qthreshold = qthresh;
- spin_unlock_bh(&inst->lock);
-
- return 0;
-}
-
-static int
-nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags)
-{
- spin_lock_bh(&inst->lock);
- inst->flags = flags;
- spin_unlock_bh(&inst->lock);
-
- return 0;
-}
-
-static struct sk_buff *
-nfulnl_alloc_skb(struct net *net, u32 peer_portid, unsigned int inst_size,
- unsigned int pkt_size)
-{
- struct sk_buff *skb;
- unsigned int n;
-
- /* alloc skb which should be big enough for a whole multipart
- * message. WARNING: has to be <= 128k due to slab restrictions */
-
- n = max(inst_size, pkt_size);
- skb = nfnetlink_alloc_skb(net, n, peer_portid, GFP_ATOMIC);
- if (!skb) {
- if (n > pkt_size) {
- /* try to allocate only as much as we need for current
- * packet */
-
- skb = nfnetlink_alloc_skb(net, pkt_size,
- peer_portid, GFP_ATOMIC);
- }
- }
-
- return skb;
-}
-
-static void
-__nfulnl_send(struct nfulnl_instance *inst)
-{
- if (inst->qlen > 1) {
- struct nlmsghdr *nlh = nlmsg_put(inst->skb, 0, 0,
- NLMSG_DONE,
- sizeof(struct nfgenmsg),
- 0);
- if (WARN_ONCE(!nlh, "bad nlskb size: %u, tailroom %d\n",
- inst->skb->len, skb_tailroom(inst->skb))) {
- kfree_skb(inst->skb);
- goto out;
- }
- }
- nfnetlink_unicast(inst->skb, inst->net, inst->peer_portid,
- MSG_DONTWAIT);
-out:
- inst->qlen = 0;
- inst->skb = NULL;
-}
-
-static void
-__nfulnl_flush(struct nfulnl_instance *inst)
-{
- /* timer holds a reference */
- if (del_timer(&inst->timer))
- instance_put(inst);
- if (inst->skb)
- __nfulnl_send(inst);
-}
-
-static void
-nfulnl_timer(unsigned long data)
-{
- struct nfulnl_instance *inst = (struct nfulnl_instance *)data;
-
- spin_lock_bh(&inst->lock);
- if (inst->skb)
- __nfulnl_send(inst);
- spin_unlock_bh(&inst->lock);
- instance_put(inst);
-}
-
-/* This is an inline function, we don't really care about a long
- * list of arguments */
-static inline int
-__build_packet_message(struct nfnl_log_net *log,
- struct nfulnl_instance *inst,
- const struct sk_buff *skb,
- unsigned int data_len,
- u_int8_t pf,
- unsigned int hooknum,
- const struct net_device *indev,
- const struct net_device *outdev,
- const char *prefix, unsigned int plen)
-{
- struct nfulnl_msg_packet_hdr pmsg;
- struct nlmsghdr *nlh;
- struct nfgenmsg *nfmsg;
- sk_buff_data_t old_tail = inst->skb->tail;
- struct sock *sk;
- const unsigned char *hwhdrp;
-
- nlh = nlmsg_put(inst->skb, 0, 0,
- NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET,
- sizeof(struct nfgenmsg), 0);
- if (!nlh)
- return -1;
- nfmsg = nlmsg_data(nlh);
- nfmsg->nfgen_family = pf;
- nfmsg->version = NFNETLINK_V0;
- nfmsg->res_id = htons(inst->group_num);
-
- memset(&pmsg, 0, sizeof(pmsg));
- pmsg.hw_protocol = skb->protocol;
- pmsg.hook = hooknum;
-
- if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg))
- goto nla_put_failure;
-
- if (prefix &&
- nla_put(inst->skb, NFULA_PREFIX, plen, prefix))
- goto nla_put_failure;
-
- if (indev) {
-#if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
- if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,
- htonl(indev->ifindex)))
- goto nla_put_failure;
-#else
- if (pf == PF_BRIDGE) {
- /* Case 1: outdev is physical input device, we need to
- * look for bridge group (when called from
- * netfilter_bridge) */
- if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV,
- htonl(indev->ifindex)) ||
- /* this is the bridge group "brX" */
- /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */
- nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,
- htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
- goto nla_put_failure;
- } else {
- struct net_device *physindev;
-
- /* Case 2: indev is bridge group, we need to look for
- * physical device (when called from ipv4) */
- if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,
- htonl(indev->ifindex)))
- goto nla_put_failure;
-
- physindev = nf_bridge_get_physindev(skb);
- if (physindev &&
- nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV,
- htonl(physindev->ifindex)))
- goto nla_put_failure;
- }
-#endif
- }
-
- if (outdev) {
-#if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
- if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
- htonl(outdev->ifindex)))
- goto nla_put_failure;
-#else
- if (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(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
- htonl(outdev->ifindex)) ||
- /* this is the bridge group "brX" */
- /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */
- nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
- htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
- goto nla_put_failure;
- } else {
- struct net_device *physoutdev;
-
- /* Case 2: indev is a bridge group, we need to look
- * for physical device (when called from ipv4) */
- if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
- htonl(outdev->ifindex)))
- goto nla_put_failure;
-
- physoutdev = nf_bridge_get_physoutdev(skb);
- if (physoutdev &&
- nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
- htonl(physoutdev->ifindex)))
- goto nla_put_failure;
- }
-#endif
- }
-
- if (skb->mark &&
- nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark)))
- goto nla_put_failure;
-
- if (indev && skb->dev &&
- skb->mac_header != skb->network_header) {
- struct nfulnl_msg_packet_hw phw;
- int len;
-
- memset(&phw, 0, sizeof(phw));
- len = dev_parse_header(skb, phw.hw_addr);
- if (len > 0) {
- phw.hw_addrlen = htons(len);
- if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw))
- goto nla_put_failure;
- }
- }
-
- if (indev && skb_mac_header_was_set(skb)) {
- if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) ||
- nla_put_be16(inst->skb, NFULA_HWLEN,
- htons(skb->dev->hard_header_len)))
- goto nla_put_failure;
-
- hwhdrp = skb_mac_header(skb);
-
- if (skb->dev->type == ARPHRD_SIT)
- hwhdrp -= ETH_HLEN;
-
- if (hwhdrp >= skb->head &&
- nla_put(inst->skb, NFULA_HWHEADER,
- skb->dev->hard_header_len, hwhdrp))
- goto nla_put_failure;
- }
-
- if (skb->tstamp.tv64) {
- struct nfulnl_msg_packet_timestamp ts;
- struct timeval tv = ktime_to_timeval(skb->tstamp);
- ts.sec = cpu_to_be64(tv.tv_sec);
- ts.usec = cpu_to_be64(tv.tv_usec);
-
- if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts))
- goto nla_put_failure;
- }
-
- /* UID */
- sk = skb->sk;
- if (sk && sk_fullsock(sk)) {
- read_lock_bh(&sk->sk_callback_lock);
- if (sk->sk_socket && sk->sk_socket->file) {
- struct file *file = sk->sk_socket->file;
- const struct cred *cred = file->f_cred;
- struct user_namespace *user_ns = inst->peer_user_ns;
- __be32 uid = htonl(from_kuid_munged(user_ns, cred->fsuid));
- __be32 gid = htonl(from_kgid_munged(user_ns, cred->fsgid));
- read_unlock_bh(&sk->sk_callback_lock);
- if (nla_put_be32(inst->skb, NFULA_UID, uid) ||
- nla_put_be32(inst->skb, NFULA_GID, gid))
- goto nla_put_failure;
- } else
- read_unlock_bh(&sk->sk_callback_lock);
- }
-
- /* local sequence number */
- if ((inst->flags & NFULNL_CFG_F_SEQ) &&
- nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++)))
- goto nla_put_failure;
-
- /* global sequence number */
- if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) &&
- nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL,
- htonl(atomic_inc_return(&log->global_seq))))
- goto nla_put_failure;
-
- if (data_len) {
- struct nlattr *nla;
- int size = nla_attr_size(data_len);
-
- if (skb_tailroom(inst->skb) < nla_total_size(data_len))
- goto nla_put_failure;
-
- nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len));
- nla->nla_type = NFULA_PAYLOAD;
- nla->nla_len = size;
-
- if (skb_copy_bits(skb, 0, nla_data(nla), data_len))
- BUG();
- }
-
- nlh->nlmsg_len = inst->skb->tail - old_tail;
- return 0;
-
-nla_put_failure:
- PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n");
- return -1;
-}
-
-static struct nf_loginfo default_loginfo = {
- .type = NF_LOG_TYPE_ULOG,
- .u = {
- .ulog = {
- .copy_len = 0xffff,
- .group = 0,
- .qthreshold = 1,
- },
- },
-};
-
-/* log handler for internal netfilter logging api */
-void
-nfulnl_log_packet(struct net *net,
- u_int8_t pf,
- unsigned int hooknum,
- const struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- const struct nf_loginfo *li_user,
- const char *prefix)
-{
- unsigned int size, data_len;
- struct nfulnl_instance *inst;
- const struct nf_loginfo *li;
- unsigned int qthreshold;
- unsigned int plen;
- struct nfnl_log_net *log = nfnl_log_pernet(net);
-
- if (li_user && li_user->type == NF_LOG_TYPE_ULOG)
- li = li_user;
- else
- li = &default_loginfo;
-
- inst = instance_lookup_get(log, li->u.ulog.group);
- if (!inst)
- return;
-
- plen = 0;
- if (prefix)
- plen = strlen(prefix) + 1;
-
- /* FIXME: do we want to make the size calculation conditional based on
- * what is actually present? way more branches and checks, but more
- * memory efficient... */
- size = nlmsg_total_size(sizeof(struct nfgenmsg))
- + nla_total_size(sizeof(struct nfulnl_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(u_int32_t)) /* uid */
- + nla_total_size(sizeof(u_int32_t)) /* gid */
- + nla_total_size(plen) /* prefix */
- + nla_total_size(sizeof(struct nfulnl_msg_packet_hw))
- + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp))
- + nla_total_size(sizeof(struct nfgenmsg)); /* NLMSG_DONE */
-
- if (in && skb_mac_header_was_set(skb)) {
- size += nla_total_size(skb->dev->hard_header_len)
- + nla_total_size(sizeof(u_int16_t)) /* hwtype */
- + nla_total_size(sizeof(u_int16_t)); /* hwlen */
- }
-
- spin_lock_bh(&inst->lock);
-
- if (inst->flags & NFULNL_CFG_F_SEQ)
- size += nla_total_size(sizeof(u_int32_t));
- if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL)
- size += nla_total_size(sizeof(u_int32_t));
-
- qthreshold = inst->qthreshold;
- /* per-rule qthreshold overrides per-instance */
- if (li->u.ulog.qthreshold)
- if (qthreshold > li->u.ulog.qthreshold)
- qthreshold = li->u.ulog.qthreshold;
-
-
- switch (inst->copy_mode) {
- case NFULNL_COPY_META:
- case NFULNL_COPY_NONE:
- data_len = 0;
- break;
-
- case NFULNL_COPY_PACKET:
- if (inst->copy_range > skb->len)
- data_len = skb->len;
- else
- data_len = inst->copy_range;
-
- size += nla_total_size(data_len);
- break;
-
- case NFULNL_COPY_DISABLED:
- default:
- goto unlock_and_release;
- }
-
- if (inst->skb && size > skb_tailroom(inst->skb)) {
- /* either the queue len is too high or we don't have
- * enough room in the skb left. flush to userspace. */
- __nfulnl_flush(inst);
- }
-
- if (!inst->skb) {
- inst->skb = nfulnl_alloc_skb(net, inst->peer_portid,
- inst->nlbufsiz, size);
- if (!inst->skb)
- goto alloc_failure;
- }
-
- inst->qlen++;
-
- __build_packet_message(log, inst, skb, data_len, pf,
- hooknum, in, out, prefix, plen);
-
- if (inst->qlen >= qthreshold)
- __nfulnl_flush(inst);
- /* timer_pending always called within inst->lock, so there
- * is no chance of a race here */
- else if (!timer_pending(&inst->timer)) {
- instance_get(inst);
- inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100);
- add_timer(&inst->timer);
- }
-
-unlock_and_release:
- spin_unlock_bh(&inst->lock);
- instance_put(inst);
- return;
-
-alloc_failure:
- /* FIXME: statistics */
- goto unlock_and_release;
-}
-EXPORT_SYMBOL_GPL(nfulnl_log_packet);
-
-static int
-nfulnl_rcv_nl_event(struct notifier_block *this,
- unsigned long event, void *ptr)
-{
- struct netlink_notify *n = ptr;
- struct nfnl_log_net *log = nfnl_log_pernet(n->net);
-
- if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
- int i;
-
- /* destroy all instances for this portid */
- spin_lock_bh(&log->instances_lock);
- for (i = 0; i < INSTANCE_BUCKETS; i++) {
- struct hlist_node *t2;
- struct nfulnl_instance *inst;
- struct hlist_head *head = &log->instance_table[i];
-
- hlist_for_each_entry_safe(inst, t2, head, hlist) {
- if (n->portid == inst->peer_portid)
- __instance_destroy(inst);
- }
- }
- spin_unlock_bh(&log->instances_lock);
- }
- return NOTIFY_DONE;
-}
-
-static struct notifier_block nfulnl_rtnl_notifier = {
- .notifier_call = nfulnl_rcv_nl_event,
-};
-
-static int
-nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- const struct nlattr * const nfqa[])
-{
- return -ENOTSUPP;
-}
-
-static struct nf_logger nfulnl_logger __read_mostly = {
- .name = "nfnetlink_log",
- .type = NF_LOG_TYPE_ULOG,
- .logfn = &nfulnl_log_packet,
- .me = THIS_MODULE,
-};
-
-static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = {
- [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) },
- [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) },
- [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 },
- [NFULA_CFG_QTHRESH] = { .type = NLA_U32 },
- [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 },
- [NFULA_CFG_FLAGS] = { .type = NLA_U16 },
-};
-
-static int
-nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- const struct nlattr * const nfula[])
-{
- struct nfgenmsg *nfmsg = nlmsg_data(nlh);
- u_int16_t group_num = ntohs(nfmsg->res_id);
- struct nfulnl_instance *inst;
- struct nfulnl_msg_config_cmd *cmd = NULL;
- struct net *net = sock_net(ctnl);
- struct nfnl_log_net *log = nfnl_log_pernet(net);
- int ret = 0;
-
- if (nfula[NFULA_CFG_CMD]) {
- u_int8_t pf = nfmsg->nfgen_family;
- cmd = nla_data(nfula[NFULA_CFG_CMD]);
-
- /* Commands without queue context */
- switch (cmd->command) {
- case NFULNL_CFG_CMD_PF_BIND:
- return nf_log_bind_pf(net, pf, &nfulnl_logger);
- case NFULNL_CFG_CMD_PF_UNBIND:
- nf_log_unbind_pf(net, pf);
- return 0;
- }
- }
-
- inst = instance_lookup_get(log, group_num);
- if (inst && inst->peer_portid != NETLINK_CB(skb).portid) {
- ret = -EPERM;
- goto out_put;
- }
-
- if (cmd != NULL) {
- switch (cmd->command) {
- case NFULNL_CFG_CMD_BIND:
- if (inst) {
- ret = -EBUSY;
- goto out_put;
- }
-
- inst = instance_create(net, group_num,
- NETLINK_CB(skb).portid,
- sk_user_ns(NETLINK_CB(skb).sk));
- if (IS_ERR(inst)) {
- ret = PTR_ERR(inst);
- goto out;
- }
- break;
- case NFULNL_CFG_CMD_UNBIND:
- if (!inst) {
- ret = -ENODEV;
- goto out;
- }
-
- instance_destroy(log, inst);
- goto out_put;
- default:
- ret = -ENOTSUPP;
- break;
- }
- }
-
- if (nfula[NFULA_CFG_MODE]) {
- struct nfulnl_msg_config_mode *params;
- params = nla_data(nfula[NFULA_CFG_MODE]);
-
- if (!inst) {
- ret = -ENODEV;
- goto out;
- }
- nfulnl_set_mode(inst, params->copy_mode,
- ntohl(params->copy_range));
- }
-
- if (nfula[NFULA_CFG_TIMEOUT]) {
- __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]);
-
- if (!inst) {
- ret = -ENODEV;
- goto out;
- }
- nfulnl_set_timeout(inst, ntohl(timeout));
- }
-
- if (nfula[NFULA_CFG_NLBUFSIZ]) {
- __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]);
-
- if (!inst) {
- ret = -ENODEV;
- goto out;
- }
- nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz));
- }
-
- if (nfula[NFULA_CFG_QTHRESH]) {
- __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]);
-
- if (!inst) {
- ret = -ENODEV;
- goto out;
- }
- nfulnl_set_qthresh(inst, ntohl(qthresh));
- }
-
- if (nfula[NFULA_CFG_FLAGS]) {
- __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]);
-
- if (!inst) {
- ret = -ENODEV;
- goto out;
- }
- nfulnl_set_flags(inst, ntohs(flags));
- }
-
-out_put:
- instance_put(inst);
-out:
- return ret;
-}
-
-static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = {
- [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp,
- .attr_count = NFULA_MAX, },
- [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config,
- .attr_count = NFULA_CFG_MAX,
- .policy = nfula_cfg_policy },
-};
-
-static const struct nfnetlink_subsystem nfulnl_subsys = {
- .name = "log",
- .subsys_id = NFNL_SUBSYS_ULOG,
- .cb_count = NFULNL_MSG_MAX,
- .cb = nfulnl_cb,
-};
-
-#ifdef CONFIG_PROC_FS
-struct iter_state {
- struct seq_net_private p;
- unsigned int bucket;
-};
-
-static struct hlist_node *get_first(struct net *net, struct iter_state *st)
-{
- struct nfnl_log_net *log;
- if (!st)
- return NULL;
-
- log = nfnl_log_pernet(net);
-
- for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
- struct hlist_head *head = &log->instance_table[st->bucket];
-
- if (!hlist_empty(head))
- return rcu_dereference_bh(hlist_first_rcu(head));
- }
- return NULL;
-}
-
-static struct hlist_node *get_next(struct net *net, struct iter_state *st,
- struct hlist_node *h)
-{
- h = rcu_dereference_bh(hlist_next_rcu(h));
- while (!h) {
- struct nfnl_log_net *log;
- struct hlist_head *head;
-
- if (++st->bucket >= INSTANCE_BUCKETS)
- return NULL;
-
- log = nfnl_log_pernet(net);
- head = &log->instance_table[st->bucket];
- h = rcu_dereference_bh(hlist_first_rcu(head));
- }
- return h;
-}
-
-static struct hlist_node *get_idx(struct net *net, struct iter_state *st,
- loff_t pos)
-{
- struct hlist_node *head;
- head = get_first(net, st);
-
- if (head)
- while (pos && (head = get_next(net, st, head)))
- pos--;
- return pos ? NULL : head;
-}
-
-static void *seq_start(struct seq_file *s, loff_t *pos)
- __acquires(rcu_bh)
-{
- rcu_read_lock_bh();
- return get_idx(seq_file_net(s), s->private, *pos);
-}
-
-static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
-{
- (*pos)++;
- return get_next(seq_file_net(s), s->private, v);
-}
-
-static void seq_stop(struct seq_file *s, void *v)
- __releases(rcu_bh)
-{
- rcu_read_unlock_bh();
-}
-
-static int seq_show(struct seq_file *s, void *v)
-{
- const struct nfulnl_instance *inst = v;
-
- seq_printf(s, "%5u %6u %5u %1u %5u %6u %2u\n",
- inst->group_num,
- inst->peer_portid, inst->qlen,
- inst->copy_mode, inst->copy_range,
- inst->flushtimeout, atomic_read(&inst->use));
-
- return 0;
-}
-
-static const struct seq_operations nful_seq_ops = {
- .start = seq_start,
- .next = seq_next,
- .stop = seq_stop,
- .show = seq_show,
-};
-
-static int nful_open(struct inode *inode, struct file *file)
-{
- return seq_open_net(inode, file, &nful_seq_ops,
- sizeof(struct iter_state));
-}
-
-static const struct file_operations nful_file_ops = {
- .owner = THIS_MODULE,
- .open = nful_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release_net,
-};
-
-#endif /* PROC_FS */
-
-static int __net_init nfnl_log_net_init(struct net *net)
-{
- unsigned int i;
- struct nfnl_log_net *log = nfnl_log_pernet(net);
-
- for (i = 0; i < INSTANCE_BUCKETS; i++)
- INIT_HLIST_HEAD(&log->instance_table[i]);
- spin_lock_init(&log->instances_lock);
-
-#ifdef CONFIG_PROC_FS
- if (!proc_create("nfnetlink_log", 0440,
- net->nf.proc_netfilter, &nful_file_ops))
- return -ENOMEM;
-#endif
- return 0;
-}
-
-static void __net_exit nfnl_log_net_exit(struct net *net)
-{
-#ifdef CONFIG_PROC_FS
- remove_proc_entry("nfnetlink_log", net->nf.proc_netfilter);
-#endif
- nf_log_unset(net, &nfulnl_logger);
-}
-
-static struct pernet_operations nfnl_log_net_ops = {
- .init = nfnl_log_net_init,
- .exit = nfnl_log_net_exit,
- .id = &nfnl_log_net_id,
- .size = sizeof(struct nfnl_log_net),
-};
-
-static int __init nfnetlink_log_init(void)
-{
- int status;
-
- status = register_pernet_subsys(&nfnl_log_net_ops);
- if (status < 0) {
- pr_err("failed to register pernet ops\n");
- goto out;
- }
-
- netlink_register_notifier(&nfulnl_rtnl_notifier);
- status = nfnetlink_subsys_register(&nfulnl_subsys);
- if (status < 0) {
- pr_err("failed to create netlink socket\n");
- goto cleanup_netlink_notifier;
- }
-
- status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger);
- if (status < 0) {
- pr_err("failed to register logger\n");
- goto cleanup_subsys;
- }
-
- return status;
-
-cleanup_subsys:
- nfnetlink_subsys_unregister(&nfulnl_subsys);
-cleanup_netlink_notifier:
- netlink_unregister_notifier(&nfulnl_rtnl_notifier);
- unregister_pernet_subsys(&nfnl_log_net_ops);
-out:
- return status;
-}
-
-static void __exit nfnetlink_log_fini(void)
-{
- nf_log_unregister(&nfulnl_logger);
- nfnetlink_subsys_unregister(&nfulnl_subsys);
- netlink_unregister_notifier(&nfulnl_rtnl_notifier);
- unregister_pernet_subsys(&nfnl_log_net_ops);
-}
-
-MODULE_DESCRIPTION("netfilter userspace logging");
-MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG);
-MODULE_ALIAS_NF_LOGGER(AF_INET, 1);
-MODULE_ALIAS_NF_LOGGER(AF_INET6, 1);
-MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 1);
-
-module_init(nfnetlink_log_init);
-module_exit(nfnetlink_log_fini);
new file mode 100644
@@ -0,0 +1,1135 @@
+/*
+ * This is a module which is used for logging packets to userspace via
+ * nfetlink.
+ *
+ * (C) 2005 by Harald Welte <laforge@netfilter.org>
+ * (C) 2006-2012 Patrick McHardy <kaber@trash.net>
+ *
+ * Based on the old ipv4-only ipt_ULOG.c:
+ * (C) 2000-2004 by Harald Welte <laforge@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.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/if_arp.h>
+#include <linux/init.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/netdevice.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_bridge.h>
+#include <net/netlink.h>
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nfnetlink_log.h>
+#include <linux/spinlock.h>
+#include <linux/sysctl.h>
+#include <linux/proc_fs.h>
+#include <linux/security.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <net/sock.h>
+#include <net/netfilter/nf_log.h>
+#include <net/netns/generic.h>
+#include <net/netfilter/nfnetlink_log.h>
+#include <net/netfilter/nfnetlink_queue.h>
+
+#include <linux/atomic.h>
+
+#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
+#include "../bridge/br_private.h"
+#endif
+
+#define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE
+#define NFULNL_TIMEOUT_DEFAULT 100 /* every second */
+#define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */
+/* max packet size is limited by 16-bit struct nfattr nfa_len field */
+#define NFULNL_COPY_RANGE_MAX (0xFFFF - NLA_HDRLEN)
+
+#define PRINTR(x, args...) do { if (net_ratelimit()) \
+ printk(x, ## args); } while (0);
+
+struct nfulnl_instance {
+ struct hlist_node hlist; /* global list of instances */
+ spinlock_t lock;
+ atomic_t use; /* use count */
+
+ unsigned int qlen; /* number of nlmsgs in skb */
+ struct sk_buff *skb; /* pre-allocatd skb */
+ struct timer_list timer;
+ struct net *net;
+ struct user_namespace *peer_user_ns; /* User namespace of the peer process */
+ u32 peer_portid; /* PORTID of the peer process */
+
+ /* configurable parameters */
+ unsigned int flushtimeout; /* timeout until queue flush */
+ unsigned int nlbufsiz; /* netlink buffer allocation size */
+ unsigned int qthreshold; /* threshold of the queue */
+ u_int32_t copy_range;
+ u_int32_t seq; /* instance-local sequential counter */
+ u_int16_t group_num; /* number of this queue */
+ u_int16_t flags;
+ u_int8_t copy_mode;
+ struct rcu_head rcu;
+};
+
+#define INSTANCE_BUCKETS 16
+
+static int nfnl_log_net_id __read_mostly;
+
+struct nfnl_log_net {
+ spinlock_t instances_lock;
+ struct hlist_head instance_table[INSTANCE_BUCKETS];
+ atomic_t global_seq;
+};
+
+static struct nfnl_log_net *nfnl_log_pernet(struct net *net)
+{
+ return net_generic(net, nfnl_log_net_id);
+}
+
+static inline u_int8_t instance_hashfn(u_int16_t group_num)
+{
+ return ((group_num & 0xff) % INSTANCE_BUCKETS);
+}
+
+static struct nfulnl_instance *
+__instance_lookup(struct nfnl_log_net *log, u_int16_t group_num)
+{
+ struct hlist_head *head;
+ struct nfulnl_instance *inst;
+
+ head = &log->instance_table[instance_hashfn(group_num)];
+ hlist_for_each_entry_rcu(inst, head, hlist) {
+ if (inst->group_num == group_num)
+ return inst;
+ }
+ return NULL;
+}
+
+static inline void
+instance_get(struct nfulnl_instance *inst)
+{
+ atomic_inc(&inst->use);
+}
+
+static struct nfulnl_instance *
+instance_lookup_get(struct nfnl_log_net *log, u_int16_t group_num)
+{
+ struct nfulnl_instance *inst;
+
+ rcu_read_lock_bh();
+ inst = __instance_lookup(log, group_num);
+ if (inst && !atomic_inc_not_zero(&inst->use))
+ inst = NULL;
+ rcu_read_unlock_bh();
+
+ return inst;
+}
+
+static void nfulnl_instance_free_rcu(struct rcu_head *head)
+{
+ struct nfulnl_instance *inst =
+ container_of(head, struct nfulnl_instance, rcu);
+
+ put_net(inst->net);
+ kfree(inst);
+ module_put(THIS_MODULE);
+}
+
+static void
+instance_put(struct nfulnl_instance *inst)
+{
+ if (inst && atomic_dec_and_test(&inst->use))
+ call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu);
+}
+
+static void nfulnl_timer(unsigned long data);
+
+static struct nfulnl_instance *
+instance_create(struct net *net, u_int16_t group_num,
+ u32 portid, struct user_namespace *user_ns)
+{
+ struct nfulnl_instance *inst;
+ struct nfnl_log_net *log = nfnl_log_pernet(net);
+ int err;
+
+ spin_lock_bh(&log->instances_lock);
+ if (__instance_lookup(log, group_num)) {
+ err = -EEXIST;
+ goto out_unlock;
+ }
+
+ inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
+ if (!inst) {
+ err = -ENOMEM;
+ goto out_unlock;
+ }
+
+ if (!try_module_get(THIS_MODULE)) {
+ kfree(inst);
+ err = -EAGAIN;
+ goto out_unlock;
+ }
+
+ INIT_HLIST_NODE(&inst->hlist);
+ spin_lock_init(&inst->lock);
+ /* needs to be two, since we _put() after creation */
+ atomic_set(&inst->use, 2);
+
+ setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst);
+
+ inst->net = get_net(net);
+ inst->peer_user_ns = user_ns;
+ inst->peer_portid = portid;
+ inst->group_num = group_num;
+
+ inst->qthreshold = NFULNL_QTHRESH_DEFAULT;
+ inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT;
+ inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT;
+ inst->copy_mode = NFULNL_COPY_PACKET;
+ inst->copy_range = NFULNL_COPY_RANGE_MAX;
+
+ hlist_add_head_rcu(&inst->hlist,
+ &log->instance_table[instance_hashfn(group_num)]);
+
+
+ spin_unlock_bh(&log->instances_lock);
+
+ return inst;
+
+out_unlock:
+ spin_unlock_bh(&log->instances_lock);
+ return ERR_PTR(err);
+}
+
+static void __nfulnl_flush(struct nfulnl_instance *inst);
+
+/* called with BH disabled */
+static void
+__instance_destroy(struct nfulnl_instance *inst)
+{
+ /* first pull it out of the global list */
+ hlist_del_rcu(&inst->hlist);
+
+ /* then flush all pending packets from skb */
+
+ spin_lock(&inst->lock);
+
+ /* lockless readers wont be able to use us */
+ inst->copy_mode = NFULNL_COPY_DISABLED;
+
+ if (inst->skb)
+ __nfulnl_flush(inst);
+ spin_unlock(&inst->lock);
+
+ /* and finally put the refcount */
+ instance_put(inst);
+}
+
+static inline void
+instance_destroy(struct nfnl_log_net *log,
+ struct nfulnl_instance *inst)
+{
+ spin_lock_bh(&log->instances_lock);
+ __instance_destroy(inst);
+ spin_unlock_bh(&log->instances_lock);
+}
+
+static int
+nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode,
+ unsigned int range)
+{
+ int status = 0;
+
+ spin_lock_bh(&inst->lock);
+
+ switch (mode) {
+ case NFULNL_COPY_NONE:
+ case NFULNL_COPY_META:
+ inst->copy_mode = mode;
+ inst->copy_range = 0;
+ break;
+
+ case NFULNL_COPY_PACKET:
+ inst->copy_mode = mode;
+ if (range == 0)
+ range = NFULNL_COPY_RANGE_MAX;
+ inst->copy_range = min_t(unsigned int,
+ range, NFULNL_COPY_RANGE_MAX);
+ break;
+
+ default:
+ status = -EINVAL;
+ break;
+ }
+
+ spin_unlock_bh(&inst->lock);
+
+ return status;
+}
+
+static int
+nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz)
+{
+ int status;
+
+ spin_lock_bh(&inst->lock);
+ if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT)
+ status = -ERANGE;
+ else if (nlbufsiz > 131072)
+ status = -ERANGE;
+ else {
+ inst->nlbufsiz = nlbufsiz;
+ status = 0;
+ }
+ spin_unlock_bh(&inst->lock);
+
+ return status;
+}
+
+static int
+nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout)
+{
+ spin_lock_bh(&inst->lock);
+ inst->flushtimeout = timeout;
+ spin_unlock_bh(&inst->lock);
+
+ return 0;
+}
+
+static int
+nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh)
+{
+ spin_lock_bh(&inst->lock);
+ inst->qthreshold = qthresh;
+ spin_unlock_bh(&inst->lock);
+
+ return 0;
+}
+
+static int
+nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags)
+{
+ spin_lock_bh(&inst->lock);
+ inst->flags = flags;
+ spin_unlock_bh(&inst->lock);
+
+ return 0;
+}
+
+static struct sk_buff *
+nfulnl_alloc_skb(struct net *net, u32 peer_portid, unsigned int inst_size,
+ unsigned int pkt_size)
+{
+ struct sk_buff *skb;
+ unsigned int n;
+
+ /* alloc skb which should be big enough for a whole multipart
+ * message. WARNING: has to be <= 128k due to slab restrictions */
+
+ n = max(inst_size, pkt_size);
+ skb = nfnetlink_alloc_skb(net, n, peer_portid, GFP_ATOMIC);
+ if (!skb) {
+ if (n > pkt_size) {
+ /* try to allocate only as much as we need for current
+ * packet */
+
+ skb = nfnetlink_alloc_skb(net, pkt_size,
+ peer_portid, GFP_ATOMIC);
+ }
+ }
+
+ return skb;
+}
+
+static void
+__nfulnl_send(struct nfulnl_instance *inst)
+{
+ if (inst->qlen > 1) {
+ struct nlmsghdr *nlh = nlmsg_put(inst->skb, 0, 0,
+ NLMSG_DONE,
+ sizeof(struct nfgenmsg),
+ 0);
+ if (WARN_ONCE(!nlh, "bad nlskb size: %u, tailroom %d\n",
+ inst->skb->len, skb_tailroom(inst->skb))) {
+ kfree_skb(inst->skb);
+ goto out;
+ }
+ }
+ nfnetlink_unicast(inst->skb, inst->net, inst->peer_portid,
+ MSG_DONTWAIT);
+out:
+ inst->qlen = 0;
+ inst->skb = NULL;
+}
+
+static void
+__nfulnl_flush(struct nfulnl_instance *inst)
+{
+ /* timer holds a reference */
+ if (del_timer(&inst->timer))
+ instance_put(inst);
+ if (inst->skb)
+ __nfulnl_send(inst);
+}
+
+static void
+nfulnl_timer(unsigned long data)
+{
+ struct nfulnl_instance *inst = (struct nfulnl_instance *)data;
+
+ spin_lock_bh(&inst->lock);
+ if (inst->skb)
+ __nfulnl_send(inst);
+ spin_unlock_bh(&inst->lock);
+ instance_put(inst);
+}
+
+/* This is an inline function, we don't really care about a long
+ * list of arguments */
+static inline int
+__build_packet_message(struct nfnl_log_net *log,
+ struct nfulnl_instance *inst,
+ const struct sk_buff *skb,
+ unsigned int data_len,
+ u_int8_t pf,
+ unsigned int hooknum,
+ const struct net_device *indev,
+ const struct net_device *outdev,
+ const char *prefix, unsigned int plen,
+ struct nf_conn *ct, enum ip_conntrack_info ctinfo)
+{
+ struct nfulnl_msg_packet_hdr pmsg;
+ struct nlmsghdr *nlh;
+ struct nfgenmsg *nfmsg;
+ sk_buff_data_t old_tail = inst->skb->tail;
+ struct sock *sk;
+ const unsigned char *hwhdrp;
+
+ nlh = nlmsg_put(inst->skb, 0, 0,
+ NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET,
+ sizeof(struct nfgenmsg), 0);
+ if (!nlh)
+ return -1;
+ nfmsg = nlmsg_data(nlh);
+ nfmsg->nfgen_family = pf;
+ nfmsg->version = NFNETLINK_V0;
+ nfmsg->res_id = htons(inst->group_num);
+
+ memset(&pmsg, 0, sizeof(pmsg));
+ pmsg.hw_protocol = skb->protocol;
+ pmsg.hook = hooknum;
+
+ if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg))
+ goto nla_put_failure;
+
+ if (prefix &&
+ nla_put(inst->skb, NFULA_PREFIX, plen, prefix))
+ goto nla_put_failure;
+
+ if (indev) {
+#if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
+ if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,
+ htonl(indev->ifindex)))
+ goto nla_put_failure;
+#else
+ if (pf == PF_BRIDGE) {
+ /* Case 1: outdev is physical input device, we need to
+ * look for bridge group (when called from
+ * netfilter_bridge) */
+ if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV,
+ htonl(indev->ifindex)) ||
+ /* this is the bridge group "brX" */
+ /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */
+ nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,
+ htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
+ goto nla_put_failure;
+ } else {
+ struct net_device *physindev;
+
+ /* Case 2: indev is bridge group, we need to look for
+ * physical device (when called from ipv4) */
+ if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,
+ htonl(indev->ifindex)))
+ goto nla_put_failure;
+
+ physindev = nf_bridge_get_physindev(skb);
+ if (physindev &&
+ nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV,
+ htonl(physindev->ifindex)))
+ goto nla_put_failure;
+ }
+#endif
+ }
+
+ if (outdev) {
+#if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
+ if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
+ htonl(outdev->ifindex)))
+ goto nla_put_failure;
+#else
+ if (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(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
+ htonl(outdev->ifindex)) ||
+ /* this is the bridge group "brX" */
+ /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */
+ nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
+ htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
+ goto nla_put_failure;
+ } else {
+ struct net_device *physoutdev;
+
+ /* Case 2: indev is a bridge group, we need to look
+ * for physical device (when called from ipv4) */
+ if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
+ htonl(outdev->ifindex)))
+ goto nla_put_failure;
+
+ physoutdev = nf_bridge_get_physoutdev(skb);
+ if (physoutdev &&
+ nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
+ htonl(physoutdev->ifindex)))
+ goto nla_put_failure;
+ }
+#endif
+ }
+
+ if (skb->mark &&
+ nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark)))
+ goto nla_put_failure;
+
+ if (indev && skb->dev &&
+ skb->mac_header != skb->network_header) {
+ struct nfulnl_msg_packet_hw phw;
+ int len;
+
+ memset(&phw, 0, sizeof(phw));
+ len = dev_parse_header(skb, phw.hw_addr);
+ if (len > 0) {
+ phw.hw_addrlen = htons(len);
+ if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw))
+ goto nla_put_failure;
+ }
+ }
+
+ if (indev && skb_mac_header_was_set(skb)) {
+ if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) ||
+ nla_put_be16(inst->skb, NFULA_HWLEN,
+ htons(skb->dev->hard_header_len)))
+ goto nla_put_failure;
+
+ hwhdrp = skb_mac_header(skb);
+
+ if (skb->dev->type == ARPHRD_SIT)
+ hwhdrp -= ETH_HLEN;
+
+ if (hwhdrp >= skb->head &&
+ nla_put(inst->skb, NFULA_HWHEADER,
+ skb->dev->hard_header_len, hwhdrp))
+ goto nla_put_failure;
+ }
+
+ if (skb->tstamp.tv64) {
+ struct nfulnl_msg_packet_timestamp ts;
+ struct timeval tv = ktime_to_timeval(skb->tstamp);
+ ts.sec = cpu_to_be64(tv.tv_sec);
+ ts.usec = cpu_to_be64(tv.tv_usec);
+
+ if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts))
+ goto nla_put_failure;
+ }
+
+ /* UID */
+ sk = skb->sk;
+ if (sk && sk_fullsock(sk)) {
+ read_lock_bh(&sk->sk_callback_lock);
+ if (sk->sk_socket && sk->sk_socket->file) {
+ struct file *file = sk->sk_socket->file;
+ const struct cred *cred = file->f_cred;
+ struct user_namespace *user_ns = inst->peer_user_ns;
+ __be32 uid = htonl(from_kuid_munged(user_ns, cred->fsuid));
+ __be32 gid = htonl(from_kgid_munged(user_ns, cred->fsgid));
+ read_unlock_bh(&sk->sk_callback_lock);
+ if (nla_put_be32(inst->skb, NFULA_UID, uid) ||
+ nla_put_be32(inst->skb, NFULA_GID, gid))
+ goto nla_put_failure;
+ } else
+ read_unlock_bh(&sk->sk_callback_lock);
+ }
+
+ /* local sequence number */
+ if ((inst->flags & NFULNL_CFG_F_SEQ) &&
+ nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++)))
+ goto nla_put_failure;
+
+ /* global sequence number */
+ if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) &&
+ nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL,
+ htonl(atomic_inc_return(&log->global_seq))))
+ goto nla_put_failure;
+
+ /* conntrack */
+ if (ct && nfqnl_ct_put(inst->skb, ct, NFULA_CT,
+ ctinfo, NFULA_CT_INFO) < 0)
+ goto nla_put_failure;
+
+ if (data_len) {
+ struct nlattr *nla;
+ int size = nla_attr_size(data_len);
+
+ if (skb_tailroom(inst->skb) < nla_total_size(data_len))
+ goto nla_put_failure;
+
+ nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len));
+ nla->nla_type = NFULA_PAYLOAD;
+ nla->nla_len = size;
+
+ if (skb_copy_bits(skb, 0, nla_data(nla), data_len))
+ BUG();
+ }
+
+ nlh->nlmsg_len = inst->skb->tail - old_tail;
+ return 0;
+
+nla_put_failure:
+ PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n");
+ return -1;
+}
+
+static struct nf_loginfo default_loginfo = {
+ .type = NF_LOG_TYPE_ULOG,
+ .u = {
+ .ulog = {
+ .copy_len = 0xffff,
+ .group = 0,
+ .qthreshold = 1,
+ },
+ },
+};
+
+/* log handler for internal netfilter logging api */
+void
+nfulnl_log_packet(struct net *net,
+ u_int8_t pf,
+ unsigned int hooknum,
+ const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const struct nf_loginfo *li_user,
+ const char *prefix)
+{
+ size_t size;
+ unsigned int data_len;
+ struct nfulnl_instance *inst;
+ const struct nf_loginfo *li;
+ unsigned int qthreshold;
+ unsigned int plen;
+ struct nfnl_log_net *log = nfnl_log_pernet(net);
+ struct nf_conn *ct = NULL;
+ enum ip_conntrack_info uninitialized_var(ctinfo);
+
+ if (li_user && li_user->type == NF_LOG_TYPE_ULOG)
+ li = li_user;
+ else
+ li = &default_loginfo;
+
+ inst = instance_lookup_get(log, li->u.ulog.group);
+ if (!inst)
+ return;
+
+ plen = 0;
+ if (prefix)
+ plen = strlen(prefix) + 1;
+
+ /* FIXME: do we want to make the size calculation conditional based on
+ * what is actually present? way more branches and checks, but more
+ * memory efficient... */
+ size = nlmsg_total_size(sizeof(struct nfgenmsg))
+ + nla_total_size(sizeof(struct nfulnl_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(u_int32_t)) /* uid */
+ + nla_total_size(sizeof(u_int32_t)) /* gid */
+ + nla_total_size(plen) /* prefix */
+ + nla_total_size(sizeof(struct nfulnl_msg_packet_hw))
+ + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp))
+ + nla_total_size(sizeof(struct nfgenmsg)); /* NLMSG_DONE */
+
+ if (in && skb_mac_header_was_set(skb)) {
+ size += nla_total_size(skb->dev->hard_header_len)
+ + nla_total_size(sizeof(u_int16_t)) /* hwtype */
+ + nla_total_size(sizeof(u_int16_t)); /* hwlen */
+ }
+
+ spin_lock_bh(&inst->lock);
+
+ if (inst->flags & NFULNL_CFG_F_SEQ)
+ size += nla_total_size(sizeof(u_int32_t));
+ if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL)
+ size += nla_total_size(sizeof(u_int32_t));
+ if (inst->flags & NFULNL_CFG_F_CONNTRACK)
+ ct = nfqnl_ct_get(skb, &size, &ctinfo);
+
+ qthreshold = inst->qthreshold;
+ /* per-rule qthreshold overrides per-instance */
+ if (li->u.ulog.qthreshold)
+ if (qthreshold > li->u.ulog.qthreshold)
+ qthreshold = li->u.ulog.qthreshold;
+
+
+ switch (inst->copy_mode) {
+ case NFULNL_COPY_META:
+ case NFULNL_COPY_NONE:
+ data_len = 0;
+ break;
+
+ case NFULNL_COPY_PACKET:
+ if (inst->copy_range > skb->len)
+ data_len = skb->len;
+ else
+ data_len = inst->copy_range;
+
+ size += nla_total_size(data_len);
+ break;
+
+ case NFULNL_COPY_DISABLED:
+ default:
+ goto unlock_and_release;
+ }
+
+ if (inst->skb && size > skb_tailroom(inst->skb)) {
+ /* either the queue len is too high or we don't have
+ * enough room in the skb left. flush to userspace. */
+ __nfulnl_flush(inst);
+ }
+
+ if (!inst->skb) {
+ inst->skb = nfulnl_alloc_skb(net, inst->peer_portid,
+ inst->nlbufsiz, size);
+ if (!inst->skb)
+ goto alloc_failure;
+ }
+
+ inst->qlen++;
+
+ __build_packet_message(log, inst, skb, data_len, pf,
+ hooknum, in, out, prefix, plen, ct, ctinfo);
+
+ if (inst->qlen >= qthreshold)
+ __nfulnl_flush(inst);
+ /* timer_pending always called within inst->lock, so there
+ * is no chance of a race here */
+ else if (!timer_pending(&inst->timer)) {
+ instance_get(inst);
+ inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100);
+ add_timer(&inst->timer);
+ }
+
+unlock_and_release:
+ spin_unlock_bh(&inst->lock);
+ instance_put(inst);
+ return;
+
+alloc_failure:
+ /* FIXME: statistics */
+ goto unlock_and_release;
+}
+EXPORT_SYMBOL_GPL(nfulnl_log_packet);
+
+static int
+nfulnl_rcv_nl_event(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ struct netlink_notify *n = ptr;
+ struct nfnl_log_net *log = nfnl_log_pernet(n->net);
+
+ if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
+ int i;
+
+ /* destroy all instances for this portid */
+ spin_lock_bh(&log->instances_lock);
+ for (i = 0; i < INSTANCE_BUCKETS; i++) {
+ struct hlist_node *t2;
+ struct nfulnl_instance *inst;
+ struct hlist_head *head = &log->instance_table[i];
+
+ hlist_for_each_entry_safe(inst, t2, head, hlist) {
+ if (n->portid == inst->peer_portid)
+ __instance_destroy(inst);
+ }
+ }
+ spin_unlock_bh(&log->instances_lock);
+ }
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block nfulnl_rtnl_notifier = {
+ .notifier_call = nfulnl_rcv_nl_event,
+};
+
+static int
+nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
+ const struct nlmsghdr *nlh,
+ const struct nlattr * const nfqa[])
+{
+ return -ENOTSUPP;
+}
+
+static struct nf_logger nfulnl_logger __read_mostly = {
+ .name = "nfnetlink_log",
+ .type = NF_LOG_TYPE_ULOG,
+ .logfn = &nfulnl_log_packet,
+ .me = THIS_MODULE,
+};
+
+static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = {
+ [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) },
+ [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) },
+ [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 },
+ [NFULA_CFG_QTHRESH] = { .type = NLA_U32 },
+ [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 },
+ [NFULA_CFG_FLAGS] = { .type = NLA_U16 },
+};
+
+static int
+nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
+ const struct nlmsghdr *nlh,
+ const struct nlattr * const nfula[])
+{
+ struct nfgenmsg *nfmsg = nlmsg_data(nlh);
+ u_int16_t group_num = ntohs(nfmsg->res_id);
+ struct nfulnl_instance *inst;
+ struct nfulnl_msg_config_cmd *cmd = NULL;
+ struct net *net = sock_net(ctnl);
+ struct nfnl_log_net *log = nfnl_log_pernet(net);
+ int ret = 0;
+
+ if (nfula[NFULA_CFG_CMD]) {
+ u_int8_t pf = nfmsg->nfgen_family;
+ cmd = nla_data(nfula[NFULA_CFG_CMD]);
+
+ /* Commands without queue context */
+ switch (cmd->command) {
+ case NFULNL_CFG_CMD_PF_BIND:
+ return nf_log_bind_pf(net, pf, &nfulnl_logger);
+ case NFULNL_CFG_CMD_PF_UNBIND:
+ nf_log_unbind_pf(net, pf);
+ return 0;
+ }
+ }
+
+ inst = instance_lookup_get(log, group_num);
+ if (inst && inst->peer_portid != NETLINK_CB(skb).portid) {
+ ret = -EPERM;
+ goto out_put;
+ }
+
+ if (cmd != NULL) {
+ switch (cmd->command) {
+ case NFULNL_CFG_CMD_BIND:
+ if (inst) {
+ ret = -EBUSY;
+ goto out_put;
+ }
+
+ inst = instance_create(net, group_num,
+ NETLINK_CB(skb).portid,
+ sk_user_ns(NETLINK_CB(skb).sk));
+ if (IS_ERR(inst)) {
+ ret = PTR_ERR(inst);
+ goto out;
+ }
+ break;
+ case NFULNL_CFG_CMD_UNBIND:
+ if (!inst) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ instance_destroy(log, inst);
+ goto out_put;
+ default:
+ ret = -ENOTSUPP;
+ break;
+ }
+ }
+
+ if (nfula[NFULA_CFG_MODE]) {
+ struct nfulnl_msg_config_mode *params;
+ params = nla_data(nfula[NFULA_CFG_MODE]);
+
+ if (!inst) {
+ ret = -ENODEV;
+ goto out;
+ }
+ nfulnl_set_mode(inst, params->copy_mode,
+ ntohl(params->copy_range));
+ }
+
+ if (nfula[NFULA_CFG_TIMEOUT]) {
+ __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]);
+
+ if (!inst) {
+ ret = -ENODEV;
+ goto out;
+ }
+ nfulnl_set_timeout(inst, ntohl(timeout));
+ }
+
+ if (nfula[NFULA_CFG_NLBUFSIZ]) {
+ __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]);
+
+ if (!inst) {
+ ret = -ENODEV;
+ goto out;
+ }
+ nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz));
+ }
+
+ if (nfula[NFULA_CFG_QTHRESH]) {
+ __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]);
+
+ if (!inst) {
+ ret = -ENODEV;
+ goto out;
+ }
+ nfulnl_set_qthresh(inst, ntohl(qthresh));
+ }
+
+ if (nfula[NFULA_CFG_FLAGS]) {
+ __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]);
+
+ if (!inst) {
+ ret = -ENODEV;
+ goto out;
+ }
+ nfulnl_set_flags(inst, ntohs(flags));
+ }
+
+out_put:
+ instance_put(inst);
+out:
+ return ret;
+}
+
+static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = {
+ [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp,
+ .attr_count = NFULA_MAX, },
+ [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config,
+ .attr_count = NFULA_CFG_MAX,
+ .policy = nfula_cfg_policy },
+};
+
+static const struct nfnetlink_subsystem nfulnl_subsys = {
+ .name = "log",
+ .subsys_id = NFNL_SUBSYS_ULOG,
+ .cb_count = NFULNL_MSG_MAX,
+ .cb = nfulnl_cb,
+};
+
+#ifdef CONFIG_PROC_FS
+struct iter_state {
+ struct seq_net_private p;
+ unsigned int bucket;
+};
+
+static struct hlist_node *get_first(struct net *net, struct iter_state *st)
+{
+ struct nfnl_log_net *log;
+ if (!st)
+ return NULL;
+
+ log = nfnl_log_pernet(net);
+
+ for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
+ struct hlist_head *head = &log->instance_table[st->bucket];
+
+ if (!hlist_empty(head))
+ return rcu_dereference_bh(hlist_first_rcu(head));
+ }
+ return NULL;
+}
+
+static struct hlist_node *get_next(struct net *net, struct iter_state *st,
+ struct hlist_node *h)
+{
+ h = rcu_dereference_bh(hlist_next_rcu(h));
+ while (!h) {
+ struct nfnl_log_net *log;
+ struct hlist_head *head;
+
+ if (++st->bucket >= INSTANCE_BUCKETS)
+ return NULL;
+
+ log = nfnl_log_pernet(net);
+ head = &log->instance_table[st->bucket];
+ h = rcu_dereference_bh(hlist_first_rcu(head));
+ }
+ return h;
+}
+
+static struct hlist_node *get_idx(struct net *net, struct iter_state *st,
+ loff_t pos)
+{
+ struct hlist_node *head;
+ head = get_first(net, st);
+
+ if (head)
+ while (pos && (head = get_next(net, st, head)))
+ pos--;
+ return pos ? NULL : head;
+}
+
+static void *seq_start(struct seq_file *s, loff_t *pos)
+ __acquires(rcu_bh)
+{
+ rcu_read_lock_bh();
+ return get_idx(seq_file_net(s), s->private, *pos);
+}
+
+static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ (*pos)++;
+ return get_next(seq_file_net(s), s->private, v);
+}
+
+static void seq_stop(struct seq_file *s, void *v)
+ __releases(rcu_bh)
+{
+ rcu_read_unlock_bh();
+}
+
+static int seq_show(struct seq_file *s, void *v)
+{
+ const struct nfulnl_instance *inst = v;
+
+ seq_printf(s, "%5u %6u %5u %1u %5u %6u %2u\n",
+ inst->group_num,
+ inst->peer_portid, inst->qlen,
+ inst->copy_mode, inst->copy_range,
+ inst->flushtimeout, atomic_read(&inst->use));
+
+ return 0;
+}
+
+static const struct seq_operations nful_seq_ops = {
+ .start = seq_start,
+ .next = seq_next,
+ .stop = seq_stop,
+ .show = seq_show,
+};
+
+static int nful_open(struct inode *inode, struct file *file)
+{
+ return seq_open_net(inode, file, &nful_seq_ops,
+ sizeof(struct iter_state));
+}
+
+static const struct file_operations nful_file_ops = {
+ .owner = THIS_MODULE,
+ .open = nful_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_net,
+};
+
+#endif /* PROC_FS */
+
+static int __net_init nfnl_log_net_init(struct net *net)
+{
+ unsigned int i;
+ struct nfnl_log_net *log = nfnl_log_pernet(net);
+
+ for (i = 0; i < INSTANCE_BUCKETS; i++)
+ INIT_HLIST_HEAD(&log->instance_table[i]);
+ spin_lock_init(&log->instances_lock);
+
+#ifdef CONFIG_PROC_FS
+ if (!proc_create("nfnetlink_log", 0440,
+ net->nf.proc_netfilter, &nful_file_ops))
+ return -ENOMEM;
+#endif
+ return 0;
+}
+
+static void __net_exit nfnl_log_net_exit(struct net *net)
+{
+#ifdef CONFIG_PROC_FS
+ remove_proc_entry("nfnetlink_log", net->nf.proc_netfilter);
+#endif
+ nf_log_unset(net, &nfulnl_logger);
+}
+
+static struct pernet_operations nfnl_log_net_ops = {
+ .init = nfnl_log_net_init,
+ .exit = nfnl_log_net_exit,
+ .id = &nfnl_log_net_id,
+ .size = sizeof(struct nfnl_log_net),
+};
+
+static int __init nfnetlink_log_init(void)
+{
+ int status;
+
+ status = register_pernet_subsys(&nfnl_log_net_ops);
+ if (status < 0) {
+ pr_err("failed to register pernet ops\n");
+ goto out;
+ }
+
+ netlink_register_notifier(&nfulnl_rtnl_notifier);
+ status = nfnetlink_subsys_register(&nfulnl_subsys);
+ if (status < 0) {
+ pr_err("failed to create netlink socket\n");
+ goto cleanup_netlink_notifier;
+ }
+
+ status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger);
+ if (status < 0) {
+ pr_err("failed to register logger\n");
+ goto cleanup_subsys;
+ }
+
+ return status;
+
+cleanup_subsys:
+ nfnetlink_subsys_unregister(&nfulnl_subsys);
+cleanup_netlink_notifier:
+ netlink_unregister_notifier(&nfulnl_rtnl_notifier);
+ unregister_pernet_subsys(&nfnl_log_net_ops);
+out:
+ return status;
+}
+
+static void __exit nfnetlink_log_fini(void)
+{
+ nf_log_unregister(&nfulnl_logger);
+ nfnetlink_subsys_unregister(&nfulnl_subsys);
+ netlink_unregister_notifier(&nfulnl_rtnl_notifier);
+ unregister_pernet_subsys(&nfnl_log_net_ops);
+}
+
+MODULE_DESCRIPTION("netfilter userspace logging");
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG);
+MODULE_ALIAS_NF_LOGGER(AF_INET, 1);
+MODULE_ALIAS_NF_LOGGER(AF_INET6, 1);
+MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 1);
+
+module_init(nfnetlink_log_init);
+module_exit(nfnetlink_log_fini);
@@ -14,7 +14,7 @@
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nfnetlink_queue.h>
-struct nf_conn *nfqnl_ct_get(struct sk_buff *entskb, size_t *size,
+struct nf_conn *nfqnl_ct_get(const struct sk_buff *entskb, size_t *size,
enum ip_conntrack_info *ctinfo)
{
struct nfq_ct_hook *nfq_ct;
This patch enables to include the conntrack information together with the packet that is sent to user-space via NFLOG, then a user-space program can acquire NATed information by this NFULA_CT attribute. Including the conntrack information is optional, you can set it via NFULNL_CFG_F_CONNTRACK flag with the NFULA_CFG_FLAGS attribute like NFQUEUE. Signed-off-by: Ken-ichirou MATSUZAWA <chamas@h4.dion.ne.jp> --- include/net/netfilter/nfnetlink_queue.h | 4 +- include/uapi/linux/netfilter/nfnetlink_log.h | 3 + net/netfilter/Kconfig | 9 +- net/netfilter/Makefile | 2 + net/netfilter/nfnetlink_log.c | 1123 ------------------------- net/netfilter/nfnetlink_log_core.c | 1135 ++++++++++++++++++++++++++ net/netfilter/nfnetlink_queue_ct.c | 2 +- 7 files changed, 1148 insertions(+), 1130 deletions(-) delete mode 100644 net/netfilter/nfnetlink_log.c create mode 100644 net/netfilter/nfnetlink_log_core.c