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- /*
- * Copyright (c) 2014 Patrick McHardy <kaber@trash.net>
- *
- * 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/nft_reject.h>
- #include <net/netfilter/ipv4/nf_reject.h>
- #include <net/netfilter/ipv6/nf_reject.h>
- static void nft_reject_inet_eval(const struct nft_expr *expr,
- struct nft_regs *regs,
- const struct nft_pktinfo *pkt)
- {
- struct nft_reject *priv = nft_expr_priv(expr);
- switch (pkt->pf) {
- case NFPROTO_IPV4:
- switch (priv->type) {
- case NFT_REJECT_ICMP_UNREACH:
- nf_send_unreach(pkt->skb, priv->icmp_code,
- pkt->hook);
- break;
- case NFT_REJECT_TCP_RST:
- nf_send_reset(pkt->net, pkt->skb, pkt->hook);
- break;
- case NFT_REJECT_ICMPX_UNREACH:
- nf_send_unreach(pkt->skb,
- nft_reject_icmp_code(priv->icmp_code),
- pkt->hook);
- break;
- }
- break;
- case NFPROTO_IPV6:
- switch (priv->type) {
- case NFT_REJECT_ICMP_UNREACH:
- nf_send_unreach6(pkt->net, pkt->skb, priv->icmp_code,
- pkt->hook);
- break;
- case NFT_REJECT_TCP_RST:
- nf_send_reset6(pkt->net, pkt->skb, pkt->hook);
- break;
- case NFT_REJECT_ICMPX_UNREACH:
- nf_send_unreach6(pkt->net, pkt->skb,
- nft_reject_icmpv6_code(priv->icmp_code),
- pkt->hook);
- break;
- }
- break;
- }
- regs->verdict.code = NF_DROP;
- }
- static int nft_reject_inet_init(const struct nft_ctx *ctx,
- const struct nft_expr *expr,
- const struct nlattr * const tb[])
- {
- struct nft_reject *priv = nft_expr_priv(expr);
- int icmp_code;
- if (tb[NFTA_REJECT_TYPE] == NULL)
- return -EINVAL;
- priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
- switch (priv->type) {
- case NFT_REJECT_ICMP_UNREACH:
- case NFT_REJECT_ICMPX_UNREACH:
- if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
- return -EINVAL;
- icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
- if (priv->type == NFT_REJECT_ICMPX_UNREACH &&
- icmp_code > NFT_REJECT_ICMPX_MAX)
- return -EINVAL;
- priv->icmp_code = icmp_code;
- break;
- case NFT_REJECT_TCP_RST:
- break;
- default:
- return -EINVAL;
- }
- return 0;
- }
- static int nft_reject_inet_dump(struct sk_buff *skb,
- const struct nft_expr *expr)
- {
- const struct nft_reject *priv = nft_expr_priv(expr);
- if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
- goto nla_put_failure;
- switch (priv->type) {
- case NFT_REJECT_ICMP_UNREACH:
- case NFT_REJECT_ICMPX_UNREACH:
- if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
- goto nla_put_failure;
- break;
- default:
- break;
- }
- return 0;
- nla_put_failure:
- return -1;
- }
- 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_inet_init,
- .dump = nft_reject_inet_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 <kaber@trash.net>");
- MODULE_ALIAS_NFT_AF_EXPR(1, "reject");
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