From 05513e9e33dbded8124567466a444d32173eecc6 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Wed, 5 Feb 2014 15:03:39 +0000 Subject: [PATCH] netfilter: nf_tables: add reject module for NFPROTO_INET Add a reject module for NFPROTO_INET. It does nothing but dispatch to the AF-specific modules based on the hook family. Signed-off-by: Patrick McHardy Signed-off-by: Pablo Neira Ayuso --- include/net/netfilter/nft_reject.h | 8 ++++ net/ipv4/netfilter/nft_reject_ipv4.c | 7 ++-- net/ipv6/netfilter/nft_reject_ipv6.c | 7 ++-- net/netfilter/Kconfig | 5 +++ net/netfilter/Makefile | 1 + net/netfilter/nft_reject_inet.c | 63 ++++++++++++++++++++++++++++ 6 files changed, 85 insertions(+), 6 deletions(-) create mode 100644 net/netfilter/nft_reject_inet.c diff --git a/include/net/netfilter/nft_reject.h b/include/net/netfilter/nft_reject.h index ecda75945e77..36b0da2d55bb 100644 --- a/include/net/netfilter/nft_reject.h +++ b/include/net/netfilter/nft_reject.h @@ -14,4 +14,12 @@ int nft_reject_init(const struct nft_ctx *ctx, int nft_reject_dump(struct sk_buff *skb, const struct nft_expr *expr); +void nft_reject_ipv4_eval(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt); + +void nft_reject_ipv6_eval(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt); + #endif diff --git a/net/ipv4/netfilter/nft_reject_ipv4.c b/net/ipv4/netfilter/nft_reject_ipv4.c index e935d8de1182..e79718a382f2 100644 --- a/net/ipv4/netfilter/nft_reject_ipv4.c +++ b/net/ipv4/netfilter/nft_reject_ipv4.c @@ -20,9 +20,9 @@ #include #include -static void nft_reject_ipv4_eval(const struct nft_expr *expr, - struct nft_data data[NFT_REG_MAX + 1], - const struct nft_pktinfo *pkt) +void nft_reject_ipv4_eval(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt) { struct nft_reject *priv = nft_expr_priv(expr); @@ -37,6 +37,7 @@ static void nft_reject_ipv4_eval(const struct nft_expr *expr, data[NFT_REG_VERDICT].verdict = NF_DROP; } +EXPORT_SYMBOL_GPL(nft_reject_ipv4_eval); static struct nft_expr_type nft_reject_ipv4_type; static const struct nft_expr_ops nft_reject_ipv4_ops = { diff --git a/net/ipv6/netfilter/nft_reject_ipv6.c b/net/ipv6/netfilter/nft_reject_ipv6.c index f73285924144..0bc19fa87821 100644 --- a/net/ipv6/netfilter/nft_reject_ipv6.c +++ b/net/ipv6/netfilter/nft_reject_ipv6.c @@ -19,9 +19,9 @@ #include #include -static void nft_reject_ipv6_eval(const struct nft_expr *expr, - struct nft_data data[NFT_REG_MAX + 1], - const struct nft_pktinfo *pkt) +void nft_reject_ipv6_eval(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt) { struct nft_reject *priv = nft_expr_priv(expr); struct net *net = dev_net((pkt->in != NULL) ? pkt->in : pkt->out); @@ -38,6 +38,7 @@ static void nft_reject_ipv6_eval(const struct nft_expr *expr, data[NFT_REG_VERDICT].verdict = NF_DROP; } +EXPORT_SYMBOL_GPL(nft_reject_ipv6_eval); static struct nft_expr_type nft_reject_ipv6_type; static const struct nft_expr_ops nft_reject_ipv6_ops = { diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig index ed8b50e62276..e9410d17619d 100644 --- a/net/netfilter/Kconfig +++ b/net/netfilter/Kconfig @@ -520,6 +520,11 @@ config NFT_REJECT explicitly deny and notify via TCP reset/ICMP informational errors unallowed traffic. +config NFT_REJECT_INET + depends on NF_TABLES_INET + default NFT_REJECT + tristate + config NFT_COMPAT depends on NF_TABLES depends on NETFILTER_XTABLES diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile index ee9c4de5f8ed..bffdad774da7 100644 --- a/net/netfilter/Makefile +++ b/net/netfilter/Makefile @@ -79,6 +79,7 @@ obj-$(CONFIG_NFT_LIMIT) += nft_limit.o obj-$(CONFIG_NFT_NAT) += nft_nat.o obj-$(CONFIG_NFT_QUEUE) += nft_queue.o obj-$(CONFIG_NFT_REJECT) += nft_reject.o +obj-$(CONFIG_NFT_REJECT_INET) += nft_reject_inet.o obj-$(CONFIG_NFT_RBTREE) += nft_rbtree.o obj-$(CONFIG_NFT_HASH) += nft_hash.o obj-$(CONFIG_NFT_COUNTER) += nft_counter.o diff --git a/net/netfilter/nft_reject_inet.c b/net/netfilter/nft_reject_inet.c new file mode 100644 index 000000000000..8a310f239c93 --- /dev/null +++ b/net/netfilter/nft_reject_inet.c @@ -0,0 +1,63 @@ +/* + * Copyright (c) 2014 Patrick McHardy + * + * 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 +#include +#include +#include +#include +#include +#include +#include + +static void nft_reject_inet_eval(const struct nft_expr *expr, + struct nft_data data[NFT_REG_MAX + 1], + const struct nft_pktinfo *pkt) +{ + switch (pkt->ops->pf) { + case NFPROTO_IPV4: + nft_reject_ipv4_eval(expr, data, pkt); + case NFPROTO_IPV6: + nft_reject_ipv6_eval(expr, data, pkt); + } +} + +static struct nft_expr_type nft_reject_inet_type; +static const struct nft_expr_ops nft_reject_inet_ops = { + .type = &nft_reject_inet_type, + .size = NFT_EXPR_SIZE(sizeof(struct nft_reject)), + .eval = nft_reject_inet_eval, + .init = nft_reject_init, + .dump = nft_reject_dump, +}; + +static struct nft_expr_type nft_reject_inet_type __read_mostly = { + .family = NFPROTO_INET, + .name = "reject", + .ops = &nft_reject_inet_ops, + .policy = nft_reject_policy, + .maxattr = NFTA_REJECT_MAX, + .owner = THIS_MODULE, +}; + +static int __init nft_reject_inet_module_init(void) +{ + return nft_register_expr(&nft_reject_inet_type); +} + +static void __exit nft_reject_inet_module_exit(void) +{ + nft_unregister_expr(&nft_reject_inet_type); +} + +module_init(nft_reject_inet_module_init); +module_exit(nft_reject_inet_module_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick McHardy "); +MODULE_ALIAS_NFT_AF_EXPR(1, "reject"); -- 2.20.1