diff options
Diffstat (limited to 'net/ipv6/netfilter/ip6t_REJECT.c')
| -rw-r--r-- | net/ipv6/netfilter/ip6t_REJECT.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/net/ipv6/netfilter/ip6t_REJECT.c b/net/ipv6/netfilter/ip6t_REJECT.c new file mode 100644 index 000000000..12331efd4 --- /dev/null +++ b/net/ipv6/netfilter/ip6t_REJECT.c @@ -0,0 +1,119 @@ +/* + * IP6 tables REJECT target module + * Linux INET6 implementation + * + * Copyright (C)2003 USAGI/WIDE Project + * + * Authors: + * Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> + * + * Copyright (c) 2005-2007 Patrick McHardy <kaber@trash.net> + * + * Based on net/ipv4/netfilter/ipt_REJECT.c + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/gfp.h> +#include <linux/module.h> +#include <linux/skbuff.h> +#include <linux/icmpv6.h> +#include <linux/netdevice.h> +#include <net/icmp.h> +#include <net/flow.h> +#include <linux/netfilter/x_tables.h> +#include <linux/netfilter_ipv6/ip6_tables.h> +#include <linux/netfilter_ipv6/ip6t_REJECT.h> + +#include <net/netfilter/ipv6/nf_reject.h> + +MODULE_AUTHOR("Yasuyuki KOZAKAI <yasuyuki.kozakai@toshiba.co.jp>"); +MODULE_DESCRIPTION("Xtables: packet \"rejection\" target for IPv6"); +MODULE_LICENSE("GPL"); + + +static unsigned int +reject_tg6(struct sk_buff *skb, const struct xt_action_param *par) +{ + const struct ip6t_reject_info *reject = par->targinfo; + struct net *net = dev_net((par->in != NULL) ? par->in : par->out); + + pr_debug("%s: medium point\n", __func__); + switch (reject->with) { + case IP6T_ICMP6_NO_ROUTE: + nf_send_unreach6(net, skb, ICMPV6_NOROUTE, par->hooknum); + break; + case IP6T_ICMP6_ADM_PROHIBITED: + nf_send_unreach6(net, skb, ICMPV6_ADM_PROHIBITED, par->hooknum); + break; + case IP6T_ICMP6_NOT_NEIGHBOUR: + nf_send_unreach6(net, skb, ICMPV6_NOT_NEIGHBOUR, par->hooknum); + break; + case IP6T_ICMP6_ADDR_UNREACH: + nf_send_unreach6(net, skb, ICMPV6_ADDR_UNREACH, par->hooknum); + break; + case IP6T_ICMP6_PORT_UNREACH: + nf_send_unreach6(net, skb, ICMPV6_PORT_UNREACH, par->hooknum); + break; + case IP6T_ICMP6_ECHOREPLY: + /* Do nothing */ + break; + case IP6T_TCP_RESET: + nf_send_reset6(net, skb, par->hooknum); + break; + default: + net_info_ratelimited("case %u not handled yet\n", reject->with); + break; + } + + return NF_DROP; +} + +static int reject_tg6_check(const struct xt_tgchk_param *par) +{ + const struct ip6t_reject_info *rejinfo = par->targinfo; + const struct ip6t_entry *e = par->entryinfo; + + if (rejinfo->with == IP6T_ICMP6_ECHOREPLY) { + pr_info("ECHOREPLY is not supported.\n"); + return -EINVAL; + } else if (rejinfo->with == IP6T_TCP_RESET) { + /* Must specify that it's a TCP packet */ + if (!(e->ipv6.flags & IP6T_F_PROTO) || + e->ipv6.proto != IPPROTO_TCP || + (e->ipv6.invflags & XT_INV_PROTO)) { + pr_info("TCP_RESET illegal for non-tcp\n"); + return -EINVAL; + } + } + return 0; +} + +static struct xt_target reject_tg6_reg __read_mostly = { + .name = "REJECT", + .family = NFPROTO_IPV6, + .target = reject_tg6, + .targetsize = sizeof(struct ip6t_reject_info), + .table = "filter", + .hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD) | + (1 << NF_INET_LOCAL_OUT), + .checkentry = reject_tg6_check, + .me = THIS_MODULE +}; + +static int __init reject_tg6_init(void) +{ + return xt_register_target(&reject_tg6_reg); +} + +static void __exit reject_tg6_exit(void) +{ + xt_unregister_target(&reject_tg6_reg); +} + +module_init(reject_tg6_init); +module_exit(reject_tg6_exit); |