1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2014 Patrick McHardy <kaber@trash.net>
6 #include <linux/kernel.h>
7 #include <linux/init.h>
8 #include <linux/module.h>
9 #include <linux/netlink.h>
10 #include <linux/netfilter.h>
11 #include <linux/netfilter/nf_tables.h>
12 #include <net/netfilter/nf_tables.h>
13 #include <net/netfilter/nft_reject.h>
14 #include <net/netfilter/ipv4/nf_reject.h>
15 #include <net/netfilter/ipv6/nf_reject.h>
17 static void nft_reject_inet_eval(const struct nft_expr
*expr
,
18 struct nft_regs
*regs
,
19 const struct nft_pktinfo
*pkt
)
21 struct nft_reject
*priv
= nft_expr_priv(expr
);
23 switch (nft_pf(pkt
)) {
26 case NFT_REJECT_ICMP_UNREACH
:
27 nf_send_unreach(pkt
->skb
, priv
->icmp_code
,
30 case NFT_REJECT_TCP_RST
:
31 nf_send_reset(nft_net(pkt
), pkt
->xt
.state
->sk
,
32 pkt
->skb
, nft_hook(pkt
));
34 case NFT_REJECT_ICMPX_UNREACH
:
35 nf_send_unreach(pkt
->skb
,
36 nft_reject_icmp_code(priv
->icmp_code
),
43 case NFT_REJECT_ICMP_UNREACH
:
44 nf_send_unreach6(nft_net(pkt
), pkt
->skb
,
45 priv
->icmp_code
, nft_hook(pkt
));
47 case NFT_REJECT_TCP_RST
:
48 nf_send_reset6(nft_net(pkt
), pkt
->xt
.state
->sk
,
49 pkt
->skb
, nft_hook(pkt
));
51 case NFT_REJECT_ICMPX_UNREACH
:
52 nf_send_unreach6(nft_net(pkt
), pkt
->skb
,
53 nft_reject_icmpv6_code(priv
->icmp_code
),
60 regs
->verdict
.code
= NF_DROP
;
63 static int nft_reject_inet_validate(const struct nft_ctx
*ctx
,
64 const struct nft_expr
*expr
,
65 const struct nft_data
**data
)
67 return nft_chain_validate_hooks(ctx
->chain
,
68 (1 << NF_INET_LOCAL_IN
) |
69 (1 << NF_INET_FORWARD
) |
70 (1 << NF_INET_LOCAL_OUT
) |
71 (1 << NF_INET_PRE_ROUTING
) |
72 (1 << NF_INET_INGRESS
));
75 static struct nft_expr_type nft_reject_inet_type
;
76 static const struct nft_expr_ops nft_reject_inet_ops
= {
77 .type
= &nft_reject_inet_type
,
78 .size
= NFT_EXPR_SIZE(sizeof(struct nft_reject
)),
79 .eval
= nft_reject_inet_eval
,
80 .init
= nft_reject_init
,
81 .dump
= nft_reject_dump
,
82 .validate
= nft_reject_inet_validate
,
85 static struct nft_expr_type nft_reject_inet_type __read_mostly
= {
86 .family
= NFPROTO_INET
,
88 .ops
= &nft_reject_inet_ops
,
89 .policy
= nft_reject_policy
,
90 .maxattr
= NFTA_REJECT_MAX
,
94 static int __init
nft_reject_inet_module_init(void)
96 return nft_register_expr(&nft_reject_inet_type
);
99 static void __exit
nft_reject_inet_module_exit(void)
101 nft_unregister_expr(&nft_reject_inet_type
);
104 module_init(nft_reject_inet_module_init
);
105 module_exit(nft_reject_inet_module_exit
);
107 MODULE_LICENSE("GPL");
108 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
109 MODULE_ALIAS_NFT_AF_EXPR(1, "reject");
110 MODULE_DESCRIPTION("Netfilter nftables reject inet support");