2 * Copyright (c) 2014 Patrick McHardy <kaber@trash.net>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/module.h>
12 #include <linux/netlink.h>
13 #include <linux/netfilter.h>
14 #include <linux/netfilter/nf_tables.h>
15 #include <net/netfilter/nf_tables.h>
16 #include <net/netfilter/nft_reject.h>
17 #include <net/netfilter/ipv4/nf_reject.h>
18 #include <net/netfilter/ipv6/nf_reject.h>
20 static void nft_reject_inet_eval(const struct nft_expr
*expr
,
21 struct nft_regs
*regs
,
22 const struct nft_pktinfo
*pkt
)
24 struct nft_reject
*priv
= nft_expr_priv(expr
);
26 switch (nft_pf(pkt
)) {
29 case NFT_REJECT_ICMP_UNREACH
:
30 nf_send_unreach(pkt
->skb
, priv
->icmp_code
,
33 case NFT_REJECT_TCP_RST
:
34 nf_send_reset(nft_net(pkt
), pkt
->skb
, nft_hook(pkt
));
36 case NFT_REJECT_ICMPX_UNREACH
:
37 nf_send_unreach(pkt
->skb
,
38 nft_reject_icmp_code(priv
->icmp_code
),
45 case NFT_REJECT_ICMP_UNREACH
:
46 nf_send_unreach6(nft_net(pkt
), pkt
->skb
,
47 priv
->icmp_code
, nft_hook(pkt
));
49 case NFT_REJECT_TCP_RST
:
50 nf_send_reset6(nft_net(pkt
), pkt
->skb
, nft_hook(pkt
));
52 case NFT_REJECT_ICMPX_UNREACH
:
53 nf_send_unreach6(nft_net(pkt
), pkt
->skb
,
54 nft_reject_icmpv6_code(priv
->icmp_code
),
61 regs
->verdict
.code
= NF_DROP
;
64 static int nft_reject_inet_init(const struct nft_ctx
*ctx
,
65 const struct nft_expr
*expr
,
66 const struct nlattr
* const tb
[])
68 struct nft_reject
*priv
= nft_expr_priv(expr
);
71 err
= nft_reject_validate(ctx
, expr
, NULL
);
75 if (tb
[NFTA_REJECT_TYPE
] == NULL
)
78 priv
->type
= ntohl(nla_get_be32(tb
[NFTA_REJECT_TYPE
]));
80 case NFT_REJECT_ICMP_UNREACH
:
81 case NFT_REJECT_ICMPX_UNREACH
:
82 if (tb
[NFTA_REJECT_ICMP_CODE
] == NULL
)
85 icmp_code
= nla_get_u8(tb
[NFTA_REJECT_ICMP_CODE
]);
86 if (priv
->type
== NFT_REJECT_ICMPX_UNREACH
&&
87 icmp_code
> NFT_REJECT_ICMPX_MAX
)
90 priv
->icmp_code
= icmp_code
;
92 case NFT_REJECT_TCP_RST
:
100 static int nft_reject_inet_dump(struct sk_buff
*skb
,
101 const struct nft_expr
*expr
)
103 const struct nft_reject
*priv
= nft_expr_priv(expr
);
105 if (nla_put_be32(skb
, NFTA_REJECT_TYPE
, htonl(priv
->type
)))
106 goto nla_put_failure
;
108 switch (priv
->type
) {
109 case NFT_REJECT_ICMP_UNREACH
:
110 case NFT_REJECT_ICMPX_UNREACH
:
111 if (nla_put_u8(skb
, NFTA_REJECT_ICMP_CODE
, priv
->icmp_code
))
112 goto nla_put_failure
;
124 static struct nft_expr_type nft_reject_inet_type
;
125 static const struct nft_expr_ops nft_reject_inet_ops
= {
126 .type
= &nft_reject_inet_type
,
127 .size
= NFT_EXPR_SIZE(sizeof(struct nft_reject
)),
128 .eval
= nft_reject_inet_eval
,
129 .init
= nft_reject_inet_init
,
130 .dump
= nft_reject_inet_dump
,
131 .validate
= nft_reject_validate
,
134 static struct nft_expr_type nft_reject_inet_type __read_mostly
= {
135 .family
= NFPROTO_INET
,
137 .ops
= &nft_reject_inet_ops
,
138 .policy
= nft_reject_policy
,
139 .maxattr
= NFTA_REJECT_MAX
,
140 .owner
= THIS_MODULE
,
143 static int __init
nft_reject_inet_module_init(void)
145 return nft_register_expr(&nft_reject_inet_type
);
148 static void __exit
nft_reject_inet_module_exit(void)
150 nft_unregister_expr(&nft_reject_inet_type
);
153 module_init(nft_reject_inet_module_init
);
154 module_exit(nft_reject_inet_module_exit
);
156 MODULE_LICENSE("GPL");
157 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
158 MODULE_ALIAS_NFT_AF_EXPR(1, "reject");