From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- net/netfilter/xt_IDLETIMER.c | 542 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 542 insertions(+) create mode 100644 net/netfilter/xt_IDLETIMER.c (limited to 'net/netfilter/xt_IDLETIMER.c') diff --git a/net/netfilter/xt_IDLETIMER.c b/net/netfilter/xt_IDLETIMER.c new file mode 100644 index 000000000..8d36303f3 --- /dev/null +++ b/net/netfilter/xt_IDLETIMER.c @@ -0,0 +1,542 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * linux/net/netfilter/xt_IDLETIMER.c + * + * Netfilter module to trigger a timer when packet matches. + * After timer expires a kevent will be sent. + * + * Copyright (C) 2004, 2010 Nokia Corporation + * Written by Timo Teras + * + * Converted to x_tables and reworked for upstream inclusion + * by Luciano Coelho + * + * Contact: Luciano Coelho + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct idletimer_tg { + struct list_head entry; + struct alarm alarm; + struct timer_list timer; + struct work_struct work; + + struct kobject *kobj; + struct device_attribute attr; + + unsigned int refcnt; + u8 timer_type; +}; + +static LIST_HEAD(idletimer_tg_list); +static DEFINE_MUTEX(list_mutex); + +static struct kobject *idletimer_tg_kobj; + +static +struct idletimer_tg *__idletimer_tg_find_by_label(const char *label) +{ + struct idletimer_tg *entry; + + list_for_each_entry(entry, &idletimer_tg_list, entry) { + if (!strcmp(label, entry->attr.attr.name)) + return entry; + } + + return NULL; +} + +static ssize_t idletimer_tg_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct idletimer_tg *timer; + unsigned long expires = 0; + struct timespec64 ktimespec = {}; + long time_diff = 0; + + mutex_lock(&list_mutex); + + timer = __idletimer_tg_find_by_label(attr->attr.name); + if (timer) { + if (timer->timer_type & XT_IDLETIMER_ALARM) { + ktime_t expires_alarm = alarm_expires_remaining(&timer->alarm); + ktimespec = ktime_to_timespec64(expires_alarm); + time_diff = ktimespec.tv_sec; + } else { + expires = timer->timer.expires; + time_diff = jiffies_to_msecs(expires - jiffies) / 1000; + } + } + + mutex_unlock(&list_mutex); + + if (time_after(expires, jiffies) || ktimespec.tv_sec > 0) + return sysfs_emit(buf, "%ld\n", time_diff); + + return sysfs_emit(buf, "0\n"); +} + +static void idletimer_tg_work(struct work_struct *work) +{ + struct idletimer_tg *timer = container_of(work, struct idletimer_tg, + work); + + sysfs_notify(idletimer_tg_kobj, NULL, timer->attr.attr.name); +} + +static void idletimer_tg_expired(struct timer_list *t) +{ + struct idletimer_tg *timer = from_timer(timer, t, timer); + + pr_debug("timer %s expired\n", timer->attr.attr.name); + + schedule_work(&timer->work); +} + +static enum alarmtimer_restart idletimer_tg_alarmproc(struct alarm *alarm, + ktime_t now) +{ + struct idletimer_tg *timer = alarm->data; + + pr_debug("alarm %s expired\n", timer->attr.attr.name); + schedule_work(&timer->work); + return ALARMTIMER_NORESTART; +} + +static int idletimer_check_sysfs_name(const char *name, unsigned int size) +{ + int ret; + + ret = xt_check_proc_name(name, size); + if (ret < 0) + return ret; + + if (!strcmp(name, "power") || + !strcmp(name, "subsystem") || + !strcmp(name, "uevent")) + return -EINVAL; + + return 0; +} + +static int idletimer_tg_create(struct idletimer_tg_info *info) +{ + int ret; + + info->timer = kzalloc(sizeof(*info->timer), GFP_KERNEL); + if (!info->timer) { + ret = -ENOMEM; + goto out; + } + + ret = idletimer_check_sysfs_name(info->label, sizeof(info->label)); + if (ret < 0) + goto out_free_timer; + + sysfs_attr_init(&info->timer->attr.attr); + info->timer->attr.attr.name = kstrdup(info->label, GFP_KERNEL); + if (!info->timer->attr.attr.name) { + ret = -ENOMEM; + goto out_free_timer; + } + info->timer->attr.attr.mode = 0444; + info->timer->attr.show = idletimer_tg_show; + + ret = sysfs_create_file(idletimer_tg_kobj, &info->timer->attr.attr); + if (ret < 0) { + pr_debug("couldn't add file to sysfs"); + goto out_free_attr; + } + + list_add(&info->timer->entry, &idletimer_tg_list); + + timer_setup(&info->timer->timer, idletimer_tg_expired, 0); + info->timer->refcnt = 1; + + INIT_WORK(&info->timer->work, idletimer_tg_work); + + mod_timer(&info->timer->timer, + msecs_to_jiffies(info->timeout * 1000) + jiffies); + + return 0; + +out_free_attr: + kfree(info->timer->attr.attr.name); +out_free_timer: + kfree(info->timer); +out: + return ret; +} + +static int idletimer_tg_create_v1(struct idletimer_tg_info_v1 *info) +{ + int ret; + + info->timer = kmalloc(sizeof(*info->timer), GFP_KERNEL); + if (!info->timer) { + ret = -ENOMEM; + goto out; + } + + ret = idletimer_check_sysfs_name(info->label, sizeof(info->label)); + if (ret < 0) + goto out_free_timer; + + sysfs_attr_init(&info->timer->attr.attr); + info->timer->attr.attr.name = kstrdup(info->label, GFP_KERNEL); + if (!info->timer->attr.attr.name) { + ret = -ENOMEM; + goto out_free_timer; + } + info->timer->attr.attr.mode = 0444; + info->timer->attr.show = idletimer_tg_show; + + ret = sysfs_create_file(idletimer_tg_kobj, &info->timer->attr.attr); + if (ret < 0) { + pr_debug("couldn't add file to sysfs"); + goto out_free_attr; + } + + /* notify userspace */ + kobject_uevent(idletimer_tg_kobj,KOBJ_ADD); + + list_add(&info->timer->entry, &idletimer_tg_list); + pr_debug("timer type value is %u", info->timer_type); + info->timer->timer_type = info->timer_type; + info->timer->refcnt = 1; + + INIT_WORK(&info->timer->work, idletimer_tg_work); + + if (info->timer->timer_type & XT_IDLETIMER_ALARM) { + ktime_t tout; + alarm_init(&info->timer->alarm, ALARM_BOOTTIME, + idletimer_tg_alarmproc); + info->timer->alarm.data = info->timer; + tout = ktime_set(info->timeout, 0); + alarm_start_relative(&info->timer->alarm, tout); + } else { + timer_setup(&info->timer->timer, idletimer_tg_expired, 0); + mod_timer(&info->timer->timer, + msecs_to_jiffies(info->timeout * 1000) + jiffies); + } + + return 0; + +out_free_attr: + kfree(info->timer->attr.attr.name); +out_free_timer: + kfree(info->timer); +out: + return ret; +} + +/* + * The actual xt_tables plugin. + */ +static unsigned int idletimer_tg_target(struct sk_buff *skb, + const struct xt_action_param *par) +{ + const struct idletimer_tg_info *info = par->targinfo; + + pr_debug("resetting timer %s, timeout period %u\n", + info->label, info->timeout); + + mod_timer(&info->timer->timer, + msecs_to_jiffies(info->timeout * 1000) + jiffies); + + return XT_CONTINUE; +} + +/* + * The actual xt_tables plugin. + */ +static unsigned int idletimer_tg_target_v1(struct sk_buff *skb, + const struct xt_action_param *par) +{ + const struct idletimer_tg_info_v1 *info = par->targinfo; + + pr_debug("resetting timer %s, timeout period %u\n", + info->label, info->timeout); + + if (info->timer->timer_type & XT_IDLETIMER_ALARM) { + ktime_t tout = ktime_set(info->timeout, 0); + alarm_start_relative(&info->timer->alarm, tout); + } else { + mod_timer(&info->timer->timer, + msecs_to_jiffies(info->timeout * 1000) + jiffies); + } + + return XT_CONTINUE; +} + +static int idletimer_tg_helper(struct idletimer_tg_info *info) +{ + if (info->timeout == 0) { + pr_debug("timeout value is zero\n"); + return -EINVAL; + } + if (info->timeout >= INT_MAX / 1000) { + pr_debug("timeout value is too big\n"); + return -EINVAL; + } + if (info->label[0] == '\0' || + strnlen(info->label, + MAX_IDLETIMER_LABEL_SIZE) == MAX_IDLETIMER_LABEL_SIZE) { + pr_debug("label is empty or not nul-terminated\n"); + return -EINVAL; + } + return 0; +} + + +static int idletimer_tg_checkentry(const struct xt_tgchk_param *par) +{ + struct idletimer_tg_info *info = par->targinfo; + int ret; + + pr_debug("checkentry targinfo%s\n", info->label); + + ret = idletimer_tg_helper(info); + if(ret < 0) + { + pr_debug("checkentry helper return invalid\n"); + return -EINVAL; + } + mutex_lock(&list_mutex); + + info->timer = __idletimer_tg_find_by_label(info->label); + if (info->timer) { + info->timer->refcnt++; + mod_timer(&info->timer->timer, + msecs_to_jiffies(info->timeout * 1000) + jiffies); + + pr_debug("increased refcnt of timer %s to %u\n", + info->label, info->timer->refcnt); + } else { + ret = idletimer_tg_create(info); + if (ret < 0) { + pr_debug("failed to create timer\n"); + mutex_unlock(&list_mutex); + return ret; + } + } + + mutex_unlock(&list_mutex); + return 0; +} + +static int idletimer_tg_checkentry_v1(const struct xt_tgchk_param *par) +{ + struct idletimer_tg_info_v1 *info = par->targinfo; + int ret; + + pr_debug("checkentry targinfo%s\n", info->label); + + if (info->send_nl_msg) + return -EOPNOTSUPP; + + ret = idletimer_tg_helper((struct idletimer_tg_info *)info); + if(ret < 0) + { + pr_debug("checkentry helper return invalid\n"); + return -EINVAL; + } + + if (info->timer_type > XT_IDLETIMER_ALARM) { + pr_debug("invalid value for timer type\n"); + return -EINVAL; + } + + mutex_lock(&list_mutex); + + info->timer = __idletimer_tg_find_by_label(info->label); + if (info->timer) { + if (info->timer->timer_type != info->timer_type) { + pr_debug("Adding/Replacing rule with same label and different timer type is not allowed\n"); + mutex_unlock(&list_mutex); + return -EINVAL; + } + + info->timer->refcnt++; + if (info->timer_type & XT_IDLETIMER_ALARM) { + /* calculate remaining expiry time */ + ktime_t tout = alarm_expires_remaining(&info->timer->alarm); + struct timespec64 ktimespec = ktime_to_timespec64(tout); + + if (ktimespec.tv_sec > 0) { + pr_debug("time_expiry_remaining %lld\n", + ktimespec.tv_sec); + alarm_start_relative(&info->timer->alarm, tout); + } + } else { + mod_timer(&info->timer->timer, + msecs_to_jiffies(info->timeout * 1000) + jiffies); + } + pr_debug("increased refcnt of timer %s to %u\n", + info->label, info->timer->refcnt); + } else { + ret = idletimer_tg_create_v1(info); + if (ret < 0) { + pr_debug("failed to create timer\n"); + mutex_unlock(&list_mutex); + return ret; + } + } + + mutex_unlock(&list_mutex); + return 0; +} + +static void idletimer_tg_destroy(const struct xt_tgdtor_param *par) +{ + const struct idletimer_tg_info *info = par->targinfo; + + pr_debug("destroy targinfo %s\n", info->label); + + mutex_lock(&list_mutex); + + if (--info->timer->refcnt == 0) { + pr_debug("deleting timer %s\n", info->label); + + list_del(&info->timer->entry); + timer_shutdown_sync(&info->timer->timer); + cancel_work_sync(&info->timer->work); + sysfs_remove_file(idletimer_tg_kobj, &info->timer->attr.attr); + kfree(info->timer->attr.attr.name); + kfree(info->timer); + } else { + pr_debug("decreased refcnt of timer %s to %u\n", + info->label, info->timer->refcnt); + } + + mutex_unlock(&list_mutex); +} + +static void idletimer_tg_destroy_v1(const struct xt_tgdtor_param *par) +{ + const struct idletimer_tg_info_v1 *info = par->targinfo; + + pr_debug("destroy targinfo %s\n", info->label); + + mutex_lock(&list_mutex); + + if (--info->timer->refcnt == 0) { + pr_debug("deleting timer %s\n", info->label); + + list_del(&info->timer->entry); + if (info->timer->timer_type & XT_IDLETIMER_ALARM) { + alarm_cancel(&info->timer->alarm); + } else { + timer_shutdown_sync(&info->timer->timer); + } + cancel_work_sync(&info->timer->work); + sysfs_remove_file(idletimer_tg_kobj, &info->timer->attr.attr); + kfree(info->timer->attr.attr.name); + kfree(info->timer); + } else { + pr_debug("decreased refcnt of timer %s to %u\n", + info->label, info->timer->refcnt); + } + + mutex_unlock(&list_mutex); +} + + +static struct xt_target idletimer_tg[] __read_mostly = { + { + .name = "IDLETIMER", + .family = NFPROTO_UNSPEC, + .target = idletimer_tg_target, + .targetsize = sizeof(struct idletimer_tg_info), + .usersize = offsetof(struct idletimer_tg_info, timer), + .checkentry = idletimer_tg_checkentry, + .destroy = idletimer_tg_destroy, + .me = THIS_MODULE, + }, + { + .name = "IDLETIMER", + .family = NFPROTO_UNSPEC, + .revision = 1, + .target = idletimer_tg_target_v1, + .targetsize = sizeof(struct idletimer_tg_info_v1), + .usersize = offsetof(struct idletimer_tg_info_v1, timer), + .checkentry = idletimer_tg_checkentry_v1, + .destroy = idletimer_tg_destroy_v1, + .me = THIS_MODULE, + }, + + +}; + +static struct class *idletimer_tg_class; + +static struct device *idletimer_tg_device; + +static int __init idletimer_tg_init(void) +{ + int err; + + idletimer_tg_class = class_create(THIS_MODULE, "xt_idletimer"); + err = PTR_ERR(idletimer_tg_class); + if (IS_ERR(idletimer_tg_class)) { + pr_debug("couldn't register device class\n"); + goto out; + } + + idletimer_tg_device = device_create(idletimer_tg_class, NULL, + MKDEV(0, 0), NULL, "timers"); + err = PTR_ERR(idletimer_tg_device); + if (IS_ERR(idletimer_tg_device)) { + pr_debug("couldn't register system device\n"); + goto out_class; + } + + idletimer_tg_kobj = &idletimer_tg_device->kobj; + + err = xt_register_targets(idletimer_tg, ARRAY_SIZE(idletimer_tg)); + + if (err < 0) { + pr_debug("couldn't register xt target\n"); + goto out_dev; + } + + return 0; +out_dev: + device_destroy(idletimer_tg_class, MKDEV(0, 0)); +out_class: + class_destroy(idletimer_tg_class); +out: + return err; +} + +static void __exit idletimer_tg_exit(void) +{ + xt_unregister_targets(idletimer_tg, ARRAY_SIZE(idletimer_tg)); + + device_destroy(idletimer_tg_class, MKDEV(0, 0)); + class_destroy(idletimer_tg_class); +} + +module_init(idletimer_tg_init); +module_exit(idletimer_tg_exit); + +MODULE_AUTHOR("Timo Teras "); +MODULE_AUTHOR("Luciano Coelho "); +MODULE_DESCRIPTION("Xtables: idle time monitor"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("ipt_IDLETIMER"); +MODULE_ALIAS("ip6t_IDLETIMER"); -- cgit v1.2.3