2 * Copyright (c) 2014 Pablo Neira Ayuso <pablo@netfilter.org>
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_bridge_eval(const struct nft_expr
*expr
,
21 struct nft_data data
[NFT_REG_MAX
+ 1],
22 const struct nft_pktinfo
*pkt
)
24 struct nft_reject
*priv
= nft_expr_priv(expr
);
25 struct net
*net
= dev_net((pkt
->in
!= NULL
) ? pkt
->in
: pkt
->out
);
27 switch (eth_hdr(pkt
->skb
)->h_proto
) {
30 case NFT_REJECT_ICMP_UNREACH
:
31 nf_send_unreach(pkt
->skb
, priv
->icmp_code
);
33 case NFT_REJECT_TCP_RST
:
34 nf_send_reset(pkt
->skb
, pkt
->ops
->hooknum
);
36 case NFT_REJECT_ICMPX_UNREACH
:
37 nf_send_unreach(pkt
->skb
,
38 nft_reject_icmp_code(priv
->icmp_code
));
42 case htons(ETH_P_IPV6
):
44 case NFT_REJECT_ICMP_UNREACH
:
45 nf_send_unreach6(net
, pkt
->skb
, priv
->icmp_code
,
48 case NFT_REJECT_TCP_RST
:
49 nf_send_reset6(net
, pkt
->skb
, pkt
->ops
->hooknum
);
51 case NFT_REJECT_ICMPX_UNREACH
:
52 nf_send_unreach6(net
, pkt
->skb
,
53 nft_reject_icmpv6_code(priv
->icmp_code
),
59 /* No explicit way to reject this protocol, drop it. */
62 data
[NFT_REG_VERDICT
].verdict
= NF_DROP
;
65 static int nft_reject_bridge_init(const struct nft_ctx
*ctx
,
66 const struct nft_expr
*expr
,
67 const struct nlattr
* const tb
[])
69 struct nft_reject
*priv
= nft_expr_priv(expr
);
72 if (tb
[NFTA_REJECT_TYPE
] == NULL
)
75 priv
->type
= ntohl(nla_get_be32(tb
[NFTA_REJECT_TYPE
]));
77 case NFT_REJECT_ICMP_UNREACH
:
78 case NFT_REJECT_ICMPX_UNREACH
:
79 if (tb
[NFTA_REJECT_ICMP_CODE
] == NULL
)
82 icmp_code
= nla_get_u8(tb
[NFTA_REJECT_ICMP_CODE
]);
83 if (priv
->type
== NFT_REJECT_ICMPX_UNREACH
&&
84 icmp_code
> NFT_REJECT_ICMPX_MAX
)
87 priv
->icmp_code
= icmp_code
;
89 case NFT_REJECT_TCP_RST
:
97 static int nft_reject_bridge_dump(struct sk_buff
*skb
,
98 const struct nft_expr
*expr
)
100 const struct nft_reject
*priv
= nft_expr_priv(expr
);
102 if (nla_put_be32(skb
, NFTA_REJECT_TYPE
, htonl(priv
->type
)))
103 goto nla_put_failure
;
105 switch (priv
->type
) {
106 case NFT_REJECT_ICMP_UNREACH
:
107 case NFT_REJECT_ICMPX_UNREACH
:
108 if (nla_put_u8(skb
, NFTA_REJECT_ICMP_CODE
, priv
->icmp_code
))
109 goto nla_put_failure
;
119 static struct nft_expr_type nft_reject_bridge_type
;
120 static const struct nft_expr_ops nft_reject_bridge_ops
= {
121 .type
= &nft_reject_bridge_type
,
122 .size
= NFT_EXPR_SIZE(sizeof(struct nft_reject
)),
123 .eval
= nft_reject_bridge_eval
,
124 .init
= nft_reject_bridge_init
,
125 .dump
= nft_reject_bridge_dump
,
128 static struct nft_expr_type nft_reject_bridge_type __read_mostly
= {
129 .family
= NFPROTO_BRIDGE
,
131 .ops
= &nft_reject_bridge_ops
,
132 .policy
= nft_reject_policy
,
133 .maxattr
= NFTA_REJECT_MAX
,
134 .owner
= THIS_MODULE
,
137 static int __init
nft_reject_bridge_module_init(void)
139 return nft_register_expr(&nft_reject_bridge_type
);
142 static void __exit
nft_reject_bridge_module_exit(void)
144 nft_unregister_expr(&nft_reject_bridge_type
);
147 module_init(nft_reject_bridge_module_init
);
148 module_exit(nft_reject_bridge_module_exit
);
150 MODULE_LICENSE("GPL");
151 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
152 MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE
, "reject");