diff options
Diffstat (limited to 'net/netfilter/xt_NFQUEUE.c')
-rw-r--r-- | net/netfilter/xt_NFQUEUE.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/net/netfilter/xt_NFQUEUE.c b/net/netfilter/xt_NFQUEUE.c new file mode 100644 index 000000000..8f1779ff7 --- /dev/null +++ b/net/netfilter/xt_NFQUEUE.c @@ -0,0 +1,160 @@ +/* iptables module for using new netfilter netlink queue + * + * (C) 2005 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. + * + */ + +#include <linux/module.h> +#include <linux/skbuff.h> + +#include <linux/netfilter.h> +#include <linux/netfilter_arp.h> +#include <linux/netfilter/x_tables.h> +#include <linux/netfilter/xt_NFQUEUE.h> + +#include <net/netfilter/nf_queue.h> + +MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); +MODULE_DESCRIPTION("Xtables: packet forwarding to netlink"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("ipt_NFQUEUE"); +MODULE_ALIAS("ip6t_NFQUEUE"); +MODULE_ALIAS("arpt_NFQUEUE"); + +static u32 jhash_initval __read_mostly; + +static unsigned int +nfqueue_tg(struct sk_buff *skb, const struct xt_action_param *par) +{ + const struct xt_NFQ_info *tinfo = par->targinfo; + + return NF_QUEUE_NR(tinfo->queuenum); +} + +static unsigned int +nfqueue_tg_v1(struct sk_buff *skb, const struct xt_action_param *par) +{ + const struct xt_NFQ_info_v1 *info = par->targinfo; + u32 queue = info->queuenum; + + if (info->queues_total > 1) { + queue = nfqueue_hash(skb, queue, info->queues_total, + par->family, jhash_initval); + } + return NF_QUEUE_NR(queue); +} + +static unsigned int +nfqueue_tg_v2(struct sk_buff *skb, const struct xt_action_param *par) +{ + const struct xt_NFQ_info_v2 *info = par->targinfo; + unsigned int ret = nfqueue_tg_v1(skb, par); + + if (info->bypass) + ret |= NF_VERDICT_FLAG_QUEUE_BYPASS; + return ret; +} + +static int nfqueue_tg_check(const struct xt_tgchk_param *par) +{ + const struct xt_NFQ_info_v3 *info = par->targinfo; + u32 maxid; + + init_hashrandom(&jhash_initval); + + if (info->queues_total == 0) { + pr_err("NFQUEUE: number of total queues is 0\n"); + return -EINVAL; + } + maxid = info->queues_total - 1 + info->queuenum; + if (maxid > 0xffff) { + pr_err("NFQUEUE: number of queues (%u) out of range (got %u)\n", + info->queues_total, maxid); + return -ERANGE; + } + if (par->target->revision == 2 && info->flags > 1) + return -EINVAL; + if (par->target->revision == 3 && info->flags & ~NFQ_FLAG_MASK) + return -EINVAL; + + return 0; +} + +static unsigned int +nfqueue_tg_v3(struct sk_buff *skb, const struct xt_action_param *par) +{ + const struct xt_NFQ_info_v3 *info = par->targinfo; + u32 queue = info->queuenum; + int ret; + + if (info->queues_total > 1) { + if (info->flags & NFQ_FLAG_CPU_FANOUT) { + int cpu = smp_processor_id(); + + queue = info->queuenum + cpu % info->queues_total; + } else { + queue = nfqueue_hash(skb, queue, info->queues_total, + par->family, jhash_initval); + } + } + + ret = NF_QUEUE_NR(queue); + if (info->flags & NFQ_FLAG_BYPASS) + ret |= NF_VERDICT_FLAG_QUEUE_BYPASS; + + return ret; +} + +static struct xt_target nfqueue_tg_reg[] __read_mostly = { + { + .name = "NFQUEUE", + .family = NFPROTO_UNSPEC, + .target = nfqueue_tg, + .targetsize = sizeof(struct xt_NFQ_info), + .me = THIS_MODULE, + }, + { + .name = "NFQUEUE", + .revision = 1, + .family = NFPROTO_UNSPEC, + .checkentry = nfqueue_tg_check, + .target = nfqueue_tg_v1, + .targetsize = sizeof(struct xt_NFQ_info_v1), + .me = THIS_MODULE, + }, + { + .name = "NFQUEUE", + .revision = 2, + .family = NFPROTO_UNSPEC, + .checkentry = nfqueue_tg_check, + .target = nfqueue_tg_v2, + .targetsize = sizeof(struct xt_NFQ_info_v2), + .me = THIS_MODULE, + }, + { + .name = "NFQUEUE", + .revision = 3, + .family = NFPROTO_UNSPEC, + .checkentry = nfqueue_tg_check, + .target = nfqueue_tg_v3, + .targetsize = sizeof(struct xt_NFQ_info_v3), + .me = THIS_MODULE, + }, +}; + +static int __init nfqueue_tg_init(void) +{ + return xt_register_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg)); +} + +static void __exit nfqueue_tg_exit(void) +{ + xt_unregister_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg)); +} + +module_init(nfqueue_tg_init); +module_exit(nfqueue_tg_exit); |