2 * Copyright (C)2003,2004 USAGI/WIDE Project
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 * Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
12 #include <linux/types.h>
13 #include <linux/timer.h>
14 #include <linux/module.h>
15 #include <linux/netfilter.h>
16 #include <linux/in6.h>
17 #include <linux/icmpv6.h>
18 #include <linux/ipv6.h>
20 #include <net/ip6_checksum.h>
21 #include <linux/seq_file.h>
22 #include <linux/netfilter_ipv6.h>
23 #include <net/netfilter/nf_conntrack_tuple.h>
24 #include <net/netfilter/nf_conntrack_l4proto.h>
25 #include <net/netfilter/nf_conntrack_core.h>
26 #include <net/netfilter/ipv6/nf_conntrack_icmpv6.h>
27 #include <net/netfilter/nf_log.h>
29 static unsigned int nf_ct_icmpv6_timeout __read_mostly
= 30*HZ
;
31 static bool icmpv6_pkt_to_tuple(const struct sk_buff
*skb
,
33 struct nf_conntrack_tuple
*tuple
)
35 const struct icmp6hdr
*hp
;
38 hp
= skb_header_pointer(skb
, dataoff
, sizeof(_hdr
), &_hdr
);
41 tuple
->dst
.u
.icmp
.type
= hp
->icmp6_type
;
42 tuple
->src
.u
.icmp
.id
= hp
->icmp6_identifier
;
43 tuple
->dst
.u
.icmp
.code
= hp
->icmp6_code
;
48 /* Add 1; spaces filled with 0. */
49 static const u_int8_t invmap
[] = {
50 [ICMPV6_ECHO_REQUEST
- 128] = ICMPV6_ECHO_REPLY
+ 1,
51 [ICMPV6_ECHO_REPLY
- 128] = ICMPV6_ECHO_REQUEST
+ 1,
52 [ICMPV6_NI_QUERY
- 128] = ICMPV6_NI_REPLY
+ 1,
53 [ICMPV6_NI_REPLY
- 128] = ICMPV6_NI_QUERY
+1
56 static const u_int8_t noct_valid_new
[] = {
57 [ICMPV6_MGM_QUERY
- 130] = 1,
58 [ICMPV6_MGM_REPORT
-130] = 1,
59 [ICMPV6_MGM_REDUCTION
- 130] = 1,
60 [NDISC_ROUTER_SOLICITATION
- 130] = 1,
61 [NDISC_ROUTER_ADVERTISEMENT
- 130] = 1,
62 [NDISC_NEIGHBOUR_SOLICITATION
- 130] = 1,
63 [NDISC_NEIGHBOUR_ADVERTISEMENT
- 130] = 1,
64 [ICMPV6_MLD2_REPORT
- 130] = 1
67 static bool icmpv6_invert_tuple(struct nf_conntrack_tuple
*tuple
,
68 const struct nf_conntrack_tuple
*orig
)
70 int type
= orig
->dst
.u
.icmp
.type
- 128;
71 if (type
< 0 || type
>= sizeof(invmap
) || !invmap
[type
])
74 tuple
->src
.u
.icmp
.id
= orig
->src
.u
.icmp
.id
;
75 tuple
->dst
.u
.icmp
.type
= invmap
[type
] - 1;
76 tuple
->dst
.u
.icmp
.code
= orig
->dst
.u
.icmp
.code
;
80 /* Print out the per-protocol part of the tuple. */
81 static int icmpv6_print_tuple(struct seq_file
*s
,
82 const struct nf_conntrack_tuple
*tuple
)
84 return seq_printf(s
, "type=%u code=%u id=%u ",
85 tuple
->dst
.u
.icmp
.type
,
86 tuple
->dst
.u
.icmp
.code
,
87 ntohs(tuple
->src
.u
.icmp
.id
));
90 /* Returns verdict for packet, or -1 for invalid. */
91 static int icmpv6_packet(struct nf_conn
*ct
,
92 const struct sk_buff
*skb
,
94 enum ip_conntrack_info ctinfo
,
98 /* Do not immediately delete the connection after the first
99 successful reply to avoid excessive conntrackd traffic
100 and also to handle correctly ICMP echo reply duplicates. */
101 nf_ct_refresh_acct(ct
, ctinfo
, skb
, nf_ct_icmpv6_timeout
);
106 /* Called when a new connection for this protocol found. */
107 static bool icmpv6_new(struct nf_conn
*ct
, const struct sk_buff
*skb
,
108 unsigned int dataoff
)
110 static const u_int8_t valid_new
[] = {
111 [ICMPV6_ECHO_REQUEST
- 128] = 1,
112 [ICMPV6_NI_QUERY
- 128] = 1
114 int type
= ct
->tuplehash
[0].tuple
.dst
.u
.icmp
.type
- 128;
116 if (type
< 0 || type
>= sizeof(valid_new
) || !valid_new
[type
]) {
117 /* Can't create a new ICMPv6 `conn' with this. */
118 pr_debug("icmpv6: can't create new conn with type %u\n",
120 nf_ct_dump_tuple_ipv6(&ct
->tuplehash
[0].tuple
);
121 if (LOG_INVALID(nf_ct_net(ct
), IPPROTO_ICMPV6
))
122 nf_log_packet(PF_INET6
, 0, skb
, NULL
, NULL
, NULL
,
123 "nf_ct_icmpv6: invalid new with type %d ",
131 icmpv6_error_message(struct net
*net
,
133 unsigned int icmp6off
,
134 enum ip_conntrack_info
*ctinfo
,
135 unsigned int hooknum
)
137 struct nf_conntrack_tuple intuple
, origtuple
;
138 const struct nf_conntrack_tuple_hash
*h
;
139 const struct nf_conntrack_l4proto
*inproto
;
141 NF_CT_ASSERT(skb
->nfct
== NULL
);
143 /* Are they talking about one of our connections? */
144 if (!nf_ct_get_tuplepr(skb
,
145 skb_network_offset(skb
)
146 + sizeof(struct ipv6hdr
)
147 + sizeof(struct icmp6hdr
),
148 PF_INET6
, &origtuple
)) {
149 pr_debug("icmpv6_error: Can't get tuple\n");
153 /* rcu_read_lock()ed by nf_hook_slow */
154 inproto
= __nf_ct_l4proto_find(PF_INET6
, origtuple
.dst
.protonum
);
156 /* Ordinarily, we'd expect the inverted tupleproto, but it's
157 been preserved inside the ICMP. */
158 if (!nf_ct_invert_tuple(&intuple
, &origtuple
,
159 &nf_conntrack_l3proto_ipv6
, inproto
)) {
160 pr_debug("icmpv6_error: Can't invert tuple\n");
164 *ctinfo
= IP_CT_RELATED
;
166 h
= nf_conntrack_find_get(net
, &intuple
);
168 pr_debug("icmpv6_error: no match\n");
171 if (NF_CT_DIRECTION(h
) == IP_CT_DIR_REPLY
)
172 *ctinfo
+= IP_CT_IS_REPLY
;
175 /* Update skb to refer to this connection */
176 skb
->nfct
= &nf_ct_tuplehash_to_ctrack(h
)->ct_general
;
177 skb
->nfctinfo
= *ctinfo
;
182 icmpv6_error(struct net
*net
, struct sk_buff
*skb
, unsigned int dataoff
,
183 enum ip_conntrack_info
*ctinfo
, u_int8_t pf
, unsigned int hooknum
)
185 const struct icmp6hdr
*icmp6h
;
189 icmp6h
= skb_header_pointer(skb
, dataoff
, sizeof(_ih
), &_ih
);
190 if (icmp6h
== NULL
) {
191 if (LOG_INVALID(net
, IPPROTO_ICMPV6
))
192 nf_log_packet(PF_INET6
, 0, skb
, NULL
, NULL
, NULL
,
193 "nf_ct_icmpv6: short packet ");
197 if (net
->ct
.sysctl_checksum
&& hooknum
== NF_INET_PRE_ROUTING
&&
198 nf_ip6_checksum(skb
, hooknum
, dataoff
, IPPROTO_ICMPV6
)) {
199 if (LOG_INVALID(net
, IPPROTO_ICMPV6
))
200 nf_log_packet(PF_INET6
, 0, skb
, NULL
, NULL
, NULL
,
201 "nf_ct_icmpv6: ICMPv6 checksum failed ");
205 type
= icmp6h
->icmp6_type
- 130;
206 if (type
>= 0 && type
< sizeof(noct_valid_new
) &&
207 noct_valid_new
[type
]) {
208 skb
->nfct
= &nf_conntrack_untracked
.ct_general
;
209 skb
->nfctinfo
= IP_CT_NEW
;
210 nf_conntrack_get(skb
->nfct
);
214 /* is not error message ? */
215 if (icmp6h
->icmp6_type
>= 128)
218 return icmpv6_error_message(net
, skb
, dataoff
, ctinfo
, hooknum
);
221 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
223 #include <linux/netfilter/nfnetlink.h>
224 #include <linux/netfilter/nfnetlink_conntrack.h>
225 static int icmpv6_tuple_to_nlattr(struct sk_buff
*skb
,
226 const struct nf_conntrack_tuple
*t
)
228 NLA_PUT_BE16(skb
, CTA_PROTO_ICMPV6_ID
, t
->src
.u
.icmp
.id
);
229 NLA_PUT_U8(skb
, CTA_PROTO_ICMPV6_TYPE
, t
->dst
.u
.icmp
.type
);
230 NLA_PUT_U8(skb
, CTA_PROTO_ICMPV6_CODE
, t
->dst
.u
.icmp
.code
);
238 static const struct nla_policy icmpv6_nla_policy
[CTA_PROTO_MAX
+1] = {
239 [CTA_PROTO_ICMPV6_TYPE
] = { .type
= NLA_U8
},
240 [CTA_PROTO_ICMPV6_CODE
] = { .type
= NLA_U8
},
241 [CTA_PROTO_ICMPV6_ID
] = { .type
= NLA_U16
},
244 static int icmpv6_nlattr_to_tuple(struct nlattr
*tb
[],
245 struct nf_conntrack_tuple
*tuple
)
247 if (!tb
[CTA_PROTO_ICMPV6_TYPE
]
248 || !tb
[CTA_PROTO_ICMPV6_CODE
]
249 || !tb
[CTA_PROTO_ICMPV6_ID
])
252 tuple
->dst
.u
.icmp
.type
= nla_get_u8(tb
[CTA_PROTO_ICMPV6_TYPE
]);
253 tuple
->dst
.u
.icmp
.code
= nla_get_u8(tb
[CTA_PROTO_ICMPV6_CODE
]);
254 tuple
->src
.u
.icmp
.id
= nla_get_be16(tb
[CTA_PROTO_ICMPV6_ID
]);
256 if (tuple
->dst
.u
.icmp
.type
< 128
257 || tuple
->dst
.u
.icmp
.type
- 128 >= sizeof(invmap
)
258 || !invmap
[tuple
->dst
.u
.icmp
.type
- 128])
264 static int icmpv6_nlattr_tuple_size(void)
266 return nla_policy_len(icmpv6_nla_policy
, CTA_PROTO_MAX
+ 1);
271 static struct ctl_table_header
*icmpv6_sysctl_header
;
272 static struct ctl_table icmpv6_sysctl_table
[] = {
274 .procname
= "nf_conntrack_icmpv6_timeout",
275 .data
= &nf_ct_icmpv6_timeout
,
276 .maxlen
= sizeof(unsigned int),
278 .proc_handler
= proc_dointvec_jiffies
,
284 #endif /* CONFIG_SYSCTL */
286 struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 __read_mostly
=
289 .l4proto
= IPPROTO_ICMPV6
,
291 .pkt_to_tuple
= icmpv6_pkt_to_tuple
,
292 .invert_tuple
= icmpv6_invert_tuple
,
293 .print_tuple
= icmpv6_print_tuple
,
294 .packet
= icmpv6_packet
,
296 .error
= icmpv6_error
,
297 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
298 .tuple_to_nlattr
= icmpv6_tuple_to_nlattr
,
299 .nlattr_tuple_size
= icmpv6_nlattr_tuple_size
,
300 .nlattr_to_tuple
= icmpv6_nlattr_to_tuple
,
301 .nla_policy
= icmpv6_nla_policy
,
304 .ctl_table_header
= &icmpv6_sysctl_header
,
305 .ctl_table
= icmpv6_sysctl_table
,