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 inline struct nf_icmp_net
*icmpv6_pernet(struct net
*net
)
34 return &net
->ct
.nf_ct_proto
.icmpv6
;
37 static bool icmpv6_pkt_to_tuple(const struct sk_buff
*skb
,
40 struct nf_conntrack_tuple
*tuple
)
42 const struct icmp6hdr
*hp
;
45 hp
= skb_header_pointer(skb
, dataoff
, sizeof(_hdr
), &_hdr
);
48 tuple
->dst
.u
.icmp
.type
= hp
->icmp6_type
;
49 tuple
->src
.u
.icmp
.id
= hp
->icmp6_identifier
;
50 tuple
->dst
.u
.icmp
.code
= hp
->icmp6_code
;
55 /* Add 1; spaces filled with 0. */
56 static const u_int8_t invmap
[] = {
57 [ICMPV6_ECHO_REQUEST
- 128] = ICMPV6_ECHO_REPLY
+ 1,
58 [ICMPV6_ECHO_REPLY
- 128] = ICMPV6_ECHO_REQUEST
+ 1,
59 [ICMPV6_NI_QUERY
- 128] = ICMPV6_NI_REPLY
+ 1,
60 [ICMPV6_NI_REPLY
- 128] = ICMPV6_NI_QUERY
+ 1
63 static const u_int8_t noct_valid_new
[] = {
64 [ICMPV6_MGM_QUERY
- 130] = 1,
65 [ICMPV6_MGM_REPORT
- 130] = 1,
66 [ICMPV6_MGM_REDUCTION
- 130] = 1,
67 [NDISC_ROUTER_SOLICITATION
- 130] = 1,
68 [NDISC_ROUTER_ADVERTISEMENT
- 130] = 1,
69 [NDISC_NEIGHBOUR_SOLICITATION
- 130] = 1,
70 [NDISC_NEIGHBOUR_ADVERTISEMENT
- 130] = 1,
71 [ICMPV6_MLD2_REPORT
- 130] = 1
74 static bool icmpv6_invert_tuple(struct nf_conntrack_tuple
*tuple
,
75 const struct nf_conntrack_tuple
*orig
)
77 int type
= orig
->dst
.u
.icmp
.type
- 128;
78 if (type
< 0 || type
>= sizeof(invmap
) || !invmap
[type
])
81 tuple
->src
.u
.icmp
.id
= orig
->src
.u
.icmp
.id
;
82 tuple
->dst
.u
.icmp
.type
= invmap
[type
] - 1;
83 tuple
->dst
.u
.icmp
.code
= orig
->dst
.u
.icmp
.code
;
87 static unsigned int *icmpv6_get_timeouts(struct net
*net
)
89 return &icmpv6_pernet(net
)->timeout
;
92 /* Returns verdict for packet, or -1 for invalid. */
93 static int icmpv6_packet(struct nf_conn
*ct
,
94 const struct sk_buff
*skb
,
96 enum ip_conntrack_info ctinfo
,
97 unsigned int *timeout
)
99 /* Do not immediately delete the connection after the first
100 successful reply to avoid excessive conntrackd traffic
101 and also to handle correctly ICMP echo reply duplicates. */
102 nf_ct_refresh_acct(ct
, ctinfo
, skb
, *timeout
);
107 /* Called when a new connection for this protocol found. */
108 static bool icmpv6_new(struct nf_conn
*ct
, const struct sk_buff
*skb
,
109 unsigned int dataoff
, unsigned int *timeouts
)
111 static const u_int8_t valid_new
[] = {
112 [ICMPV6_ECHO_REQUEST
- 128] = 1,
113 [ICMPV6_NI_QUERY
- 128] = 1
115 int type
= ct
->tuplehash
[0].tuple
.dst
.u
.icmp
.type
- 128;
117 if (type
< 0 || type
>= sizeof(valid_new
) || !valid_new
[type
]) {
118 /* Can't create a new ICMPv6 `conn' with this. */
119 pr_debug("icmpv6: can't create new conn with type %u\n",
121 nf_ct_dump_tuple_ipv6(&ct
->tuplehash
[0].tuple
);
128 icmpv6_error_message(struct net
*net
, struct nf_conn
*tmpl
,
130 unsigned int icmp6off
)
132 struct nf_conntrack_tuple intuple
, origtuple
;
133 const struct nf_conntrack_tuple_hash
*h
;
134 const struct nf_conntrack_l4proto
*inproto
;
135 enum ip_conntrack_info ctinfo
;
136 struct nf_conntrack_zone tmp
;
138 WARN_ON(skb_nfct(skb
));
140 /* Are they talking about one of our connections? */
141 if (!nf_ct_get_tuplepr(skb
,
142 skb_network_offset(skb
)
143 + sizeof(struct ipv6hdr
)
144 + sizeof(struct icmp6hdr
),
145 PF_INET6
, net
, &origtuple
)) {
146 pr_debug("icmpv6_error: Can't get tuple\n");
150 /* rcu_read_lock()ed by nf_hook_thresh */
151 inproto
= __nf_ct_l4proto_find(PF_INET6
, origtuple
.dst
.protonum
);
153 /* Ordinarily, we'd expect the inverted tupleproto, but it's
154 been preserved inside the ICMP. */
155 if (!nf_ct_invert_tuple(&intuple
, &origtuple
,
156 &nf_conntrack_l3proto_ipv6
, inproto
)) {
157 pr_debug("icmpv6_error: Can't invert tuple\n");
161 ctinfo
= IP_CT_RELATED
;
163 h
= nf_conntrack_find_get(net
, nf_ct_zone_tmpl(tmpl
, skb
, &tmp
),
166 pr_debug("icmpv6_error: no match\n");
169 if (NF_CT_DIRECTION(h
) == IP_CT_DIR_REPLY
)
170 ctinfo
+= IP_CT_IS_REPLY
;
173 /* Update skb to refer to this connection */
174 nf_ct_set(skb
, nf_ct_tuplehash_to_ctrack(h
), ctinfo
);
178 static void icmpv6_error_log(const struct sk_buff
*skb
, struct net
*net
,
179 u8 pf
, const char *msg
)
181 nf_l4proto_log_invalid(skb
, net
, pf
, IPPROTO_ICMPV6
, "%s", msg
);
185 icmpv6_error(struct net
*net
, struct nf_conn
*tmpl
,
186 struct sk_buff
*skb
, unsigned int dataoff
,
187 u8 pf
, unsigned int hooknum
)
189 const struct icmp6hdr
*icmp6h
;
193 icmp6h
= skb_header_pointer(skb
, dataoff
, sizeof(_ih
), &_ih
);
194 if (icmp6h
== NULL
) {
195 icmpv6_error_log(skb
, net
, pf
, "short packet");
199 if (net
->ct
.sysctl_checksum
&& hooknum
== NF_INET_PRE_ROUTING
&&
200 nf_ip6_checksum(skb
, hooknum
, dataoff
, IPPROTO_ICMPV6
)) {
201 icmpv6_error_log(skb
, net
, pf
, "ICMPv6 checksum failed");
205 type
= icmp6h
->icmp6_type
- 130;
206 if (type
>= 0 && type
< sizeof(noct_valid_new
) &&
207 noct_valid_new
[type
]) {
208 nf_ct_set(skb
, NULL
, IP_CT_UNTRACKED
);
212 /* is not error message ? */
213 if (icmp6h
->icmp6_type
>= 128)
216 return icmpv6_error_message(net
, tmpl
, skb
, dataoff
);
219 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
221 #include <linux/netfilter/nfnetlink.h>
222 #include <linux/netfilter/nfnetlink_conntrack.h>
223 static int icmpv6_tuple_to_nlattr(struct sk_buff
*skb
,
224 const struct nf_conntrack_tuple
*t
)
226 if (nla_put_be16(skb
, CTA_PROTO_ICMPV6_ID
, t
->src
.u
.icmp
.id
) ||
227 nla_put_u8(skb
, CTA_PROTO_ICMPV6_TYPE
, t
->dst
.u
.icmp
.type
) ||
228 nla_put_u8(skb
, CTA_PROTO_ICMPV6_CODE
, t
->dst
.u
.icmp
.code
))
229 goto nla_put_failure
;
236 static const struct nla_policy icmpv6_nla_policy
[CTA_PROTO_MAX
+1] = {
237 [CTA_PROTO_ICMPV6_TYPE
] = { .type
= NLA_U8
},
238 [CTA_PROTO_ICMPV6_CODE
] = { .type
= NLA_U8
},
239 [CTA_PROTO_ICMPV6_ID
] = { .type
= NLA_U16
},
242 static int icmpv6_nlattr_to_tuple(struct nlattr
*tb
[],
243 struct nf_conntrack_tuple
*tuple
)
245 if (!tb
[CTA_PROTO_ICMPV6_TYPE
] ||
246 !tb
[CTA_PROTO_ICMPV6_CODE
] ||
247 !tb
[CTA_PROTO_ICMPV6_ID
])
250 tuple
->dst
.u
.icmp
.type
= nla_get_u8(tb
[CTA_PROTO_ICMPV6_TYPE
]);
251 tuple
->dst
.u
.icmp
.code
= nla_get_u8(tb
[CTA_PROTO_ICMPV6_CODE
]);
252 tuple
->src
.u
.icmp
.id
= nla_get_be16(tb
[CTA_PROTO_ICMPV6_ID
]);
254 if (tuple
->dst
.u
.icmp
.type
< 128 ||
255 tuple
->dst
.u
.icmp
.type
- 128 >= sizeof(invmap
) ||
256 !invmap
[tuple
->dst
.u
.icmp
.type
- 128])
262 static unsigned int icmpv6_nlattr_tuple_size(void)
264 static unsigned int size __read_mostly
;
267 size
= nla_policy_len(icmpv6_nla_policy
, CTA_PROTO_MAX
+ 1);
273 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
275 #include <linux/netfilter/nfnetlink.h>
276 #include <linux/netfilter/nfnetlink_cttimeout.h>
278 static int icmpv6_timeout_nlattr_to_obj(struct nlattr
*tb
[],
279 struct net
*net
, void *data
)
281 unsigned int *timeout
= data
;
282 struct nf_icmp_net
*in
= icmpv6_pernet(net
);
284 if (tb
[CTA_TIMEOUT_ICMPV6_TIMEOUT
]) {
286 ntohl(nla_get_be32(tb
[CTA_TIMEOUT_ICMPV6_TIMEOUT
])) * HZ
;
288 /* Set default ICMPv6 timeout. */
289 *timeout
= in
->timeout
;
295 icmpv6_timeout_obj_to_nlattr(struct sk_buff
*skb
, const void *data
)
297 const unsigned int *timeout
= data
;
299 if (nla_put_be32(skb
, CTA_TIMEOUT_ICMPV6_TIMEOUT
, htonl(*timeout
/ HZ
)))
300 goto nla_put_failure
;
307 static const struct nla_policy
308 icmpv6_timeout_nla_policy
[CTA_TIMEOUT_ICMPV6_MAX
+1] = {
309 [CTA_TIMEOUT_ICMPV6_TIMEOUT
] = { .type
= NLA_U32
},
311 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
314 static struct ctl_table icmpv6_sysctl_table
[] = {
316 .procname
= "nf_conntrack_icmpv6_timeout",
317 .maxlen
= sizeof(unsigned int),
319 .proc_handler
= proc_dointvec_jiffies
,
323 #endif /* CONFIG_SYSCTL */
325 static int icmpv6_kmemdup_sysctl_table(struct nf_proto_net
*pn
,
326 struct nf_icmp_net
*in
)
329 pn
->ctl_table
= kmemdup(icmpv6_sysctl_table
,
330 sizeof(icmpv6_sysctl_table
),
335 pn
->ctl_table
[0].data
= &in
->timeout
;
340 static int icmpv6_init_net(struct net
*net
, u_int16_t proto
)
342 struct nf_icmp_net
*in
= icmpv6_pernet(net
);
343 struct nf_proto_net
*pn
= &in
->pn
;
345 in
->timeout
= nf_ct_icmpv6_timeout
;
347 return icmpv6_kmemdup_sysctl_table(pn
, in
);
350 static struct nf_proto_net
*icmpv6_get_net_proto(struct net
*net
)
352 return &net
->ct
.nf_ct_proto
.icmpv6
.pn
;
355 struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 __read_mostly
=
358 .l4proto
= IPPROTO_ICMPV6
,
359 .pkt_to_tuple
= icmpv6_pkt_to_tuple
,
360 .invert_tuple
= icmpv6_invert_tuple
,
361 .packet
= icmpv6_packet
,
362 .get_timeouts
= icmpv6_get_timeouts
,
364 .error
= icmpv6_error
,
365 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
366 .tuple_to_nlattr
= icmpv6_tuple_to_nlattr
,
367 .nlattr_tuple_size
= icmpv6_nlattr_tuple_size
,
368 .nlattr_to_tuple
= icmpv6_nlattr_to_tuple
,
369 .nla_policy
= icmpv6_nla_policy
,
371 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
373 .nlattr_to_obj
= icmpv6_timeout_nlattr_to_obj
,
374 .obj_to_nlattr
= icmpv6_timeout_obj_to_nlattr
,
375 .nlattr_max
= CTA_TIMEOUT_ICMP_MAX
,
376 .obj_size
= sizeof(unsigned int),
377 .nla_policy
= icmpv6_timeout_nla_policy
,
379 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
380 .init_net
= icmpv6_init_net
,
381 .get_net_proto
= icmpv6_get_net_proto
,