diff options
Diffstat (limited to 'net/netfilter')
| -rw-r--r-- | net/netfilter/Kconfig | 16 | ||||
| -rw-r--r-- | net/netfilter/Makefile | 6 | ||||
| -rw-r--r-- | net/netfilter/nf_dup_netdev.c | 40 | ||||
| -rw-r--r-- | net/netfilter/nft_dup_netdev.c | 97 |
4 files changed, 159 insertions, 0 deletions
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig index 4692782..8514cc4 100644 --- a/net/netfilter/Kconfig +++ b/net/netfilter/Kconfig @@ -563,6 +563,22 @@ config NFT_COMPAT x_tables match/target extensions over the nf_tables framework. +if NF_TABLES_NETDEV + +config NF_DUP_NETDEV + tristate "Netfilter packet duplication support" + help + This option enables the generic packet duplication infrastructure + for Netfilter. + +config NFT_DUP_NETDEV + tristate "Netfilter nf_tables netdev packet duplication support" + select NF_DUP_NETDEV + help + This option enables packet duplication for the "netdev" family. + +endif # NF_TABLES_NETDEV + endif # NF_TABLES config NETFILTER_XTABLES diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile index 2293484..5c99133 100644 --- a/net/netfilter/Makefile +++ b/net/netfilter/Makefile @@ -66,6 +66,9 @@ obj-$(CONFIG_NF_NAT_TFTP) += nf_nat_tftp.o # SYNPROXY obj-$(CONFIG_NETFILTER_SYNPROXY) += nf_synproxy_core.o +# generic packet duplication from netdev family +obj-$(CONFIG_NF_DUP_NETDEV) += nf_dup_netdev.o + # nf_tables nf_tables-objs += nf_tables_core.o nf_tables_api.o nf_tables_trace.o nf_tables-objs += nft_immediate.o nft_cmp.o nft_lookup.o nft_dynset.o @@ -90,6 +93,9 @@ obj-$(CONFIG_NFT_LOG) += nft_log.o obj-$(CONFIG_NFT_MASQ) += nft_masq.o obj-$(CONFIG_NFT_REDIR) += nft_redir.o +# nf_tables netdev +obj-$(CONFIG_NFT_DUP_NETDEV) += nft_dup_netdev.o + # generic X tables obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o diff --git a/net/netfilter/nf_dup_netdev.c b/net/netfilter/nf_dup_netdev.c new file mode 100644 index 0000000..8414ee1 --- /dev/null +++ b/net/netfilter/nf_dup_netdev.c @@ -0,0 +1,40 @@ +/* + * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables.h> + +void nf_dup_netdev_egress(const struct nft_pktinfo *pkt, int oif) +{ + struct net_device *dev; + struct sk_buff *skb; + + dev = dev_get_by_index_rcu(pkt->net, oif); + if (dev == NULL) + return; + + skb = skb_clone(pkt->skb, GFP_ATOMIC); + if (skb == NULL) + return; + + if (skb_mac_header_was_set(skb)) + skb_push(skb, skb->mac_len); + + skb->dev = dev; + skb_sender_cpu_clear(skb); + dev_queue_xmit(skb); +} +EXPORT_SYMBOL_GPL(nf_dup_netdev_egress); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); diff --git a/net/netfilter/nft_dup_netdev.c b/net/netfilter/nft_dup_netdev.c new file mode 100644 index 0000000..2cc1e0ef --- /dev/null +++ b/net/netfilter/nft_dup_netdev.c @@ -0,0 +1,97 @@ +/* + * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables.h> +#include <net/netfilter/nf_dup_netdev.h> + +struct nft_dup_netdev { + enum nft_registers sreg_dev:8; +}; + +static void nft_dup_netdev_eval(const struct nft_expr *expr, + struct nft_regs *regs, + const struct nft_pktinfo *pkt) +{ + struct nft_dup_netdev *priv = nft_expr_priv(expr); + int oif = regs->data[priv->sreg_dev]; + + nf_dup_netdev_egress(pkt, oif); +} + +static const struct nla_policy nft_dup_netdev_policy[NFTA_DUP_MAX + 1] = { + [NFTA_DUP_SREG_DEV] = { .type = NLA_U32 }, +}; + +static int nft_dup_netdev_init(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nlattr * const tb[]) +{ + struct nft_dup_netdev *priv = nft_expr_priv(expr); + + if (tb[NFTA_DUP_SREG_DEV] == NULL) + return -EINVAL; + + priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]); + return nft_validate_register_load(priv->sreg_dev, sizeof(int)); +} + +static const struct nft_expr_ops nft_dup_netdev_ingress_ops; + +static int nft_dup_netdev_dump(struct sk_buff *skb, const struct nft_expr *expr) +{ + struct nft_dup_netdev *priv = nft_expr_priv(expr); + + if (nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev)) + goto nla_put_failure; + + return 0; + +nla_put_failure: + return -1; +} + +static struct nft_expr_type nft_dup_netdev_type; +static const struct nft_expr_ops nft_dup_netdev_ops = { + .type = &nft_dup_netdev_type, + .size = NFT_EXPR_SIZE(sizeof(struct nft_dup_netdev)), + .eval = nft_dup_netdev_eval, + .init = nft_dup_netdev_init, + .dump = nft_dup_netdev_dump, +}; + +static struct nft_expr_type nft_dup_netdev_type __read_mostly = { + .family = NFPROTO_NETDEV, + .name = "dup", + .ops = &nft_dup_netdev_ops, + .policy = nft_dup_netdev_policy, + .maxattr = NFTA_DUP_MAX, + .owner = THIS_MODULE, +}; + +static int __init nft_dup_netdev_module_init(void) +{ + return nft_register_expr(&nft_dup_netdev_type); +} + +static void __exit nft_dup_netdev_module_exit(void) +{ + nft_unregister_expr(&nft_dup_netdev_type); +} + +module_init(nft_dup_netdev_module_init); +module_exit(nft_dup_netdev_module_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); +MODULE_ALIAS_NFT_AF_EXPR(5, "dup"); |
