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/nf_conntrack_zones.h>
27 #include <net/netfilter/ipv6/nf_conntrack_icmpv6.h>
28 #include <net/netfilter/nf_log.h>
30 static unsigned int nf_ct_icmpv6_timeout __read_mostly
= 30*HZ
;
32 static bool icmpv6_pkt_to_tuple(const struct sk_buff
*skb
,
34 struct nf_conntrack_tuple
*tuple
)
36 const struct icmp6hdr
*hp
;
39 hp
= skb_header_pointer(skb
, dataoff
, sizeof(_hdr
), &_hdr
);
42 tuple
->dst
.u
.icmp
.type
= hp
->icmp6_type
;
43 tuple
->src
.u
.icmp
.id
= hp
->icmp6_identifier
;
44 tuple
->dst
.u
.icmp
.code
= hp
->icmp6_code
;
49 /* Add 1; spaces filled with 0. */
50 static const u_int8_t invmap
[] = {
51 [ICMPV6_ECHO_REQUEST
- 128] = ICMPV6_ECHO_REPLY
+ 1,
52 [ICMPV6_ECHO_REPLY
- 128] = ICMPV6_ECHO_REQUEST
+ 1,
53 [ICMPV6_NI_QUERY
- 128] = ICMPV6_NI_REPLY
+ 1,
54 [ICMPV6_NI_REPLY
- 128] = ICMPV6_NI_QUERY
+1
57 static const u_int8_t noct_valid_new
[] = {
58 [ICMPV6_MGM_QUERY
- 130] = 1,
59 [ICMPV6_MGM_REPORT
-130] = 1,
60 [ICMPV6_MGM_REDUCTION
- 130] = 1,
61 [NDISC_ROUTER_SOLICITATION
- 130] = 1,
62 [NDISC_ROUTER_ADVERTISEMENT
- 130] = 1,
63 [NDISC_NEIGHBOUR_SOLICITATION
- 130] = 1,
64 [NDISC_NEIGHBOUR_ADVERTISEMENT
- 130] = 1,
65 [ICMPV6_MLD2_REPORT
- 130] = 1
68 static bool icmpv6_invert_tuple(struct nf_conntrack_tuple
*tuple
,
69 const struct nf_conntrack_tuple
*orig
)
71 int type
= orig
->dst
.u
.icmp
.type
- 128;
72 if (type
< 0 || type
>= sizeof(invmap
) || !invmap
[type
])
75 tuple
->src
.u
.icmp
.id
= orig
->src
.u
.icmp
.id
;
76 tuple
->dst
.u
.icmp
.type
= invmap
[type
] - 1;
77 tuple
->dst
.u
.icmp
.code
= orig
->dst
.u
.icmp
.code
;
81 /* Print out the per-protocol part of the tuple. */
82 static int icmpv6_print_tuple(struct seq_file
*s
,
83 const struct nf_conntrack_tuple
*tuple
)
85 return seq_printf(s
, "type=%u code=%u id=%u ",
86 tuple
->dst
.u
.icmp
.type
,
87 tuple
->dst
.u
.icmp
.code
,
88 ntohs(tuple
->src
.u
.icmp
.id
));
91 static unsigned int *icmpv6_get_timeouts(struct net
*net
)
93 return &nf_ct_icmpv6_timeout
;
96 /* Returns verdict for packet, or -1 for invalid. */
97 static int icmpv6_packet(struct nf_conn
*ct
,
98 const struct sk_buff
*skb
,
100 enum ip_conntrack_info ctinfo
,
102 unsigned int hooknum
,
103 unsigned int *timeout
)
105 /* Do not immediately delete the connection after the first
106 successful reply to avoid excessive conntrackd traffic
107 and also to handle correctly ICMP echo reply duplicates. */
108 nf_ct_refresh_acct(ct
, ctinfo
, skb
, *timeout
);
113 /* Called when a new connection for this protocol found. */
114 static bool icmpv6_new(struct nf_conn
*ct
, const struct sk_buff
*skb
,
115 unsigned int dataoff
, unsigned int *timeouts
)
117 static const u_int8_t valid_new
[] = {
118 [ICMPV6_ECHO_REQUEST
- 128] = 1,
119 [ICMPV6_NI_QUERY
- 128] = 1
121 int type
= ct
->tuplehash
[0].tuple
.dst
.u
.icmp
.type
- 128;
123 if (type
< 0 || type
>= sizeof(valid_new
) || !valid_new
[type
]) {
124 /* Can't create a new ICMPv6 `conn' with this. */
125 pr_debug("icmpv6: can't create new conn with type %u\n",
127 nf_ct_dump_tuple_ipv6(&ct
->tuplehash
[0].tuple
);
128 if (LOG_INVALID(nf_ct_net(ct
), IPPROTO_ICMPV6
))
129 nf_log_packet(PF_INET6
, 0, skb
, NULL
, NULL
, NULL
,
130 "nf_ct_icmpv6: invalid new with type %d ",
138 icmpv6_error_message(struct net
*net
, struct nf_conn
*tmpl
,
140 unsigned int icmp6off
,
141 enum ip_conntrack_info
*ctinfo
,
142 unsigned int hooknum
)
144 struct nf_conntrack_tuple intuple
, origtuple
;
145 const struct nf_conntrack_tuple_hash
*h
;
146 const struct nf_conntrack_l4proto
*inproto
;
147 u16 zone
= tmpl
? nf_ct_zone(tmpl
) : NF_CT_DEFAULT_ZONE
;
149 NF_CT_ASSERT(skb
->nfct
== NULL
);
151 /* Are they talking about one of our connections? */
152 if (!nf_ct_get_tuplepr(skb
,
153 skb_network_offset(skb
)
154 + sizeof(struct ipv6hdr
)
155 + sizeof(struct icmp6hdr
),
156 PF_INET6
, &origtuple
)) {
157 pr_debug("icmpv6_error: Can't get tuple\n");
161 /* rcu_read_lock()ed by nf_hook_slow */
162 inproto
= __nf_ct_l4proto_find(PF_INET6
, origtuple
.dst
.protonum
);
164 /* Ordinarily, we'd expect the inverted tupleproto, but it's
165 been preserved inside the ICMP. */
166 if (!nf_ct_invert_tuple(&intuple
, &origtuple
,
167 &nf_conntrack_l3proto_ipv6
, inproto
)) {
168 pr_debug("icmpv6_error: Can't invert tuple\n");
172 *ctinfo
= IP_CT_RELATED
;
174 h
= nf_conntrack_find_get(net
, zone
, &intuple
);
176 pr_debug("icmpv6_error: no match\n");
179 if (NF_CT_DIRECTION(h
) == IP_CT_DIR_REPLY
)
180 *ctinfo
+= IP_CT_IS_REPLY
;
183 /* Update skb to refer to this connection */
184 skb
->nfct
= &nf_ct_tuplehash_to_ctrack(h
)->ct_general
;
185 skb
->nfctinfo
= *ctinfo
;
190 icmpv6_error(struct net
*net
, struct nf_conn
*tmpl
,
191 struct sk_buff
*skb
, unsigned int dataoff
,
192 enum ip_conntrack_info
*ctinfo
, u_int8_t pf
, unsigned int hooknum
)
194 const struct icmp6hdr
*icmp6h
;
198 icmp6h
= skb_header_pointer(skb
, dataoff
, sizeof(_ih
), &_ih
);
199 if (icmp6h
== NULL
) {
200 if (LOG_INVALID(net
, IPPROTO_ICMPV6
))
201 nf_log_packet(PF_INET6
, 0, skb
, NULL
, NULL
, NULL
,
202 "nf_ct_icmpv6: short packet ");
206 if (net
->ct
.sysctl_checksum
&& hooknum
== NF_INET_PRE_ROUTING
&&
207 nf_ip6_checksum(skb
, hooknum
, dataoff
, IPPROTO_ICMPV6
)) {
208 if (LOG_INVALID(net
, IPPROTO_ICMPV6
))
209 nf_log_packet(PF_INET6
, 0, skb
, NULL
, NULL
, NULL
,
210 "nf_ct_icmpv6: ICMPv6 checksum failed ");
214 type
= icmp6h
->icmp6_type
- 130;
215 if (type
>= 0 && type
< sizeof(noct_valid_new
) &&
216 noct_valid_new
[type
]) {
217 skb
->nfct
= &nf_ct_untracked_get()->ct_general
;
218 skb
->nfctinfo
= IP_CT_NEW
;
219 nf_conntrack_get(skb
->nfct
);
223 /* is not error message ? */
224 if (icmp6h
->icmp6_type
>= 128)
227 return icmpv6_error_message(net
, tmpl
, skb
, dataoff
, ctinfo
, hooknum
);
230 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
232 #include <linux/netfilter/nfnetlink.h>
233 #include <linux/netfilter/nfnetlink_conntrack.h>
234 static int icmpv6_tuple_to_nlattr(struct sk_buff
*skb
,
235 const struct nf_conntrack_tuple
*t
)
237 NLA_PUT_BE16(skb
, CTA_PROTO_ICMPV6_ID
, t
->src
.u
.icmp
.id
);
238 NLA_PUT_U8(skb
, CTA_PROTO_ICMPV6_TYPE
, t
->dst
.u
.icmp
.type
);
239 NLA_PUT_U8(skb
, CTA_PROTO_ICMPV6_CODE
, t
->dst
.u
.icmp
.code
);
247 static const struct nla_policy icmpv6_nla_policy
[CTA_PROTO_MAX
+1] = {
248 [CTA_PROTO_ICMPV6_TYPE
] = { .type
= NLA_U8
},
249 [CTA_PROTO_ICMPV6_CODE
] = { .type
= NLA_U8
},
250 [CTA_PROTO_ICMPV6_ID
] = { .type
= NLA_U16
},
253 static int icmpv6_nlattr_to_tuple(struct nlattr
*tb
[],
254 struct nf_conntrack_tuple
*tuple
)
256 if (!tb
[CTA_PROTO_ICMPV6_TYPE
] ||
257 !tb
[CTA_PROTO_ICMPV6_CODE
] ||
258 !tb
[CTA_PROTO_ICMPV6_ID
])
261 tuple
->dst
.u
.icmp
.type
= nla_get_u8(tb
[CTA_PROTO_ICMPV6_TYPE
]);
262 tuple
->dst
.u
.icmp
.code
= nla_get_u8(tb
[CTA_PROTO_ICMPV6_CODE
]);
263 tuple
->src
.u
.icmp
.id
= nla_get_be16(tb
[CTA_PROTO_ICMPV6_ID
]);
265 if (tuple
->dst
.u
.icmp
.type
< 128 ||
266 tuple
->dst
.u
.icmp
.type
- 128 >= sizeof(invmap
) ||
267 !invmap
[tuple
->dst
.u
.icmp
.type
- 128])
273 static int icmpv6_nlattr_tuple_size(void)
275 return nla_policy_len(icmpv6_nla_policy
, CTA_PROTO_MAX
+ 1);
279 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
281 #include <linux/netfilter/nfnetlink.h>
282 #include <linux/netfilter/nfnetlink_cttimeout.h>
284 static int icmpv6_timeout_nlattr_to_obj(struct nlattr
*tb
[], void *data
)
286 unsigned int *timeout
= data
;
288 if (tb
[CTA_TIMEOUT_ICMPV6_TIMEOUT
]) {
290 ntohl(nla_get_be32(tb
[CTA_TIMEOUT_ICMPV6_TIMEOUT
])) * HZ
;
292 /* Set default ICMPv6 timeout. */
293 *timeout
= nf_ct_icmpv6_timeout
;
299 icmpv6_timeout_obj_to_nlattr(struct sk_buff
*skb
, const void *data
)
301 const unsigned int *timeout
= data
;
303 NLA_PUT_BE32(skb
, CTA_TIMEOUT_ICMPV6_TIMEOUT
, htonl(*timeout
/ HZ
));
311 static const struct nla_policy
312 icmpv6_timeout_nla_policy
[CTA_TIMEOUT_ICMPV6_MAX
+1] = {
313 [CTA_TIMEOUT_ICMPV6_TIMEOUT
] = { .type
= NLA_U32
},
315 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
318 static struct ctl_table_header
*icmpv6_sysctl_header
;
319 static struct ctl_table icmpv6_sysctl_table
[] = {
321 .procname
= "nf_conntrack_icmpv6_timeout",
322 .data
= &nf_ct_icmpv6_timeout
,
323 .maxlen
= sizeof(unsigned int),
325 .proc_handler
= proc_dointvec_jiffies
,
329 #endif /* CONFIG_SYSCTL */
331 struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 __read_mostly
=
334 .l4proto
= IPPROTO_ICMPV6
,
336 .pkt_to_tuple
= icmpv6_pkt_to_tuple
,
337 .invert_tuple
= icmpv6_invert_tuple
,
338 .print_tuple
= icmpv6_print_tuple
,
339 .packet
= icmpv6_packet
,
340 .get_timeouts
= icmpv6_get_timeouts
,
342 .error
= icmpv6_error
,
343 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
344 .tuple_to_nlattr
= icmpv6_tuple_to_nlattr
,
345 .nlattr_tuple_size
= icmpv6_nlattr_tuple_size
,
346 .nlattr_to_tuple
= icmpv6_nlattr_to_tuple
,
347 .nla_policy
= icmpv6_nla_policy
,
349 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
351 .nlattr_to_obj
= icmpv6_timeout_nlattr_to_obj
,
352 .obj_to_nlattr
= icmpv6_timeout_obj_to_nlattr
,
353 .nlattr_max
= CTA_TIMEOUT_ICMP_MAX
,
354 .obj_size
= sizeof(unsigned int),
355 .nla_policy
= icmpv6_timeout_nla_policy
,
357 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
359 .ctl_table_header
= &icmpv6_sysctl_header
,
360 .ctl_table
= icmpv6_sysctl_table
,