1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C)2003,2004 USAGI/WIDE Project
6 * Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
9 #include <linux/types.h>
10 #include <linux/timer.h>
11 #include <linux/module.h>
12 #include <linux/netfilter.h>
13 #include <linux/in6.h>
14 #include <linux/icmpv6.h>
15 #include <linux/ipv6.h>
17 #include <net/ip6_checksum.h>
18 #include <linux/seq_file.h>
19 #include <linux/netfilter_ipv6.h>
20 #include <net/netfilter/nf_conntrack_tuple.h>
21 #include <net/netfilter/nf_conntrack_l4proto.h>
22 #include <net/netfilter/nf_conntrack_core.h>
23 #include <net/netfilter/nf_conntrack_timeout.h>
24 #include <net/netfilter/nf_conntrack_zones.h>
25 #include <net/netfilter/nf_log.h>
27 #include "nf_internals.h"
29 static const unsigned int nf_ct_icmpv6_timeout
= 30*HZ
;
31 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 bool nf_conntrack_invert_icmpv6_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 static unsigned int *icmpv6_get_timeouts(struct net
*net
)
83 return &nf_icmpv6_pernet(net
)->timeout
;
86 /* Returns verdict for packet, or -1 for invalid. */
87 int nf_conntrack_icmpv6_packet(struct nf_conn
*ct
,
89 enum ip_conntrack_info ctinfo
,
90 const struct nf_hook_state
*state
)
92 unsigned int *timeout
= nf_ct_timeout_lookup(ct
);
93 static const u8 valid_new
[] = {
94 [ICMPV6_ECHO_REQUEST
- 128] = 1,
95 [ICMPV6_NI_QUERY
- 128] = 1
98 if (state
->pf
!= NFPROTO_IPV6
)
101 if (!nf_ct_is_confirmed(ct
)) {
102 int type
= ct
->tuplehash
[0].tuple
.dst
.u
.icmp
.type
- 128;
104 if (type
< 0 || type
>= sizeof(valid_new
) || !valid_new
[type
]) {
105 /* Can't create a new ICMPv6 `conn' with this. */
106 pr_debug("icmpv6: can't create new conn with type %u\n",
108 nf_ct_dump_tuple_ipv6(&ct
->tuplehash
[0].tuple
);
114 timeout
= icmpv6_get_timeouts(nf_ct_net(ct
));
116 /* Do not immediately delete the connection after the first
117 successful reply to avoid excessive conntrackd traffic
118 and also to handle correctly ICMP echo reply duplicates. */
119 nf_ct_refresh_acct(ct
, ctinfo
, skb
, *timeout
);
125 static void icmpv6_error_log(const struct sk_buff
*skb
,
126 const struct nf_hook_state
*state
,
129 nf_l4proto_log_invalid(skb
, state
->net
, state
->pf
,
130 IPPROTO_ICMPV6
, "%s", msg
);
133 int nf_conntrack_icmpv6_error(struct nf_conn
*tmpl
,
135 unsigned int dataoff
,
136 const struct nf_hook_state
*state
)
138 union nf_inet_addr outer_daddr
;
139 const struct icmp6hdr
*icmp6h
;
143 icmp6h
= skb_header_pointer(skb
, dataoff
, sizeof(_ih
), &_ih
);
144 if (icmp6h
== NULL
) {
145 icmpv6_error_log(skb
, state
, "short packet");
149 if (state
->hook
== NF_INET_PRE_ROUTING
&&
150 state
->net
->ct
.sysctl_checksum
&&
151 nf_ip6_checksum(skb
, state
->hook
, dataoff
, IPPROTO_ICMPV6
)) {
152 icmpv6_error_log(skb
, state
, "ICMPv6 checksum failed");
156 type
= icmp6h
->icmp6_type
- 130;
157 if (type
>= 0 && type
< sizeof(noct_valid_new
) &&
158 noct_valid_new
[type
]) {
159 nf_ct_set(skb
, NULL
, IP_CT_UNTRACKED
);
163 /* is not error message ? */
164 if (icmp6h
->icmp6_type
>= 128)
167 memcpy(&outer_daddr
.ip6
, &ipv6_hdr(skb
)->daddr
,
168 sizeof(outer_daddr
.ip6
));
169 dataoff
+= sizeof(*icmp6h
);
170 return nf_conntrack_inet_error(tmpl
, skb
, dataoff
, state
,
171 IPPROTO_ICMPV6
, &outer_daddr
);
174 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
176 #include <linux/netfilter/nfnetlink.h>
177 #include <linux/netfilter/nfnetlink_conntrack.h>
178 static int icmpv6_tuple_to_nlattr(struct sk_buff
*skb
,
179 const struct nf_conntrack_tuple
*t
)
181 if (nla_put_be16(skb
, CTA_PROTO_ICMPV6_ID
, t
->src
.u
.icmp
.id
) ||
182 nla_put_u8(skb
, CTA_PROTO_ICMPV6_TYPE
, t
->dst
.u
.icmp
.type
) ||
183 nla_put_u8(skb
, CTA_PROTO_ICMPV6_CODE
, t
->dst
.u
.icmp
.code
))
184 goto nla_put_failure
;
191 static const struct nla_policy icmpv6_nla_policy
[CTA_PROTO_MAX
+1] = {
192 [CTA_PROTO_ICMPV6_TYPE
] = { .type
= NLA_U8
},
193 [CTA_PROTO_ICMPV6_CODE
] = { .type
= NLA_U8
},
194 [CTA_PROTO_ICMPV6_ID
] = { .type
= NLA_U16
},
197 static int icmpv6_nlattr_to_tuple(struct nlattr
*tb
[],
198 struct nf_conntrack_tuple
*tuple
,
201 if (flags
& CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE
)) {
202 if (!tb
[CTA_PROTO_ICMPV6_TYPE
])
205 tuple
->dst
.u
.icmp
.type
= nla_get_u8(tb
[CTA_PROTO_ICMPV6_TYPE
]);
206 if (tuple
->dst
.u
.icmp
.type
< 128 ||
207 tuple
->dst
.u
.icmp
.type
- 128 >= sizeof(invmap
) ||
208 !invmap
[tuple
->dst
.u
.icmp
.type
- 128])
212 if (flags
& CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE
)) {
213 if (!tb
[CTA_PROTO_ICMPV6_CODE
])
216 tuple
->dst
.u
.icmp
.code
= nla_get_u8(tb
[CTA_PROTO_ICMPV6_CODE
]);
219 if (flags
& CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID
)) {
220 if (!tb
[CTA_PROTO_ICMPV6_ID
])
223 tuple
->src
.u
.icmp
.id
= nla_get_be16(tb
[CTA_PROTO_ICMPV6_ID
]);
229 static unsigned int icmpv6_nlattr_tuple_size(void)
231 static unsigned int size __read_mostly
;
234 size
= nla_policy_len(icmpv6_nla_policy
, CTA_PROTO_MAX
+ 1);
240 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
242 #include <linux/netfilter/nfnetlink.h>
243 #include <linux/netfilter/nfnetlink_cttimeout.h>
245 static int icmpv6_timeout_nlattr_to_obj(struct nlattr
*tb
[],
246 struct net
*net
, void *data
)
248 unsigned int *timeout
= data
;
249 struct nf_icmp_net
*in
= nf_icmpv6_pernet(net
);
252 timeout
= icmpv6_get_timeouts(net
);
253 if (tb
[CTA_TIMEOUT_ICMPV6_TIMEOUT
]) {
255 ntohl(nla_get_be32(tb
[CTA_TIMEOUT_ICMPV6_TIMEOUT
])) * HZ
;
257 /* Set default ICMPv6 timeout. */
258 *timeout
= in
->timeout
;
264 icmpv6_timeout_obj_to_nlattr(struct sk_buff
*skb
, const void *data
)
266 const unsigned int *timeout
= data
;
268 if (nla_put_be32(skb
, CTA_TIMEOUT_ICMPV6_TIMEOUT
, htonl(*timeout
/ HZ
)))
269 goto nla_put_failure
;
276 static const struct nla_policy
277 icmpv6_timeout_nla_policy
[CTA_TIMEOUT_ICMPV6_MAX
+1] = {
278 [CTA_TIMEOUT_ICMPV6_TIMEOUT
] = { .type
= NLA_U32
},
280 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
282 void nf_conntrack_icmpv6_init_net(struct net
*net
)
284 struct nf_icmp_net
*in
= nf_icmpv6_pernet(net
);
286 in
->timeout
= nf_ct_icmpv6_timeout
;
289 const struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6
=
291 .l4proto
= IPPROTO_ICMPV6
,
292 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
293 .tuple_to_nlattr
= icmpv6_tuple_to_nlattr
,
294 .nlattr_tuple_size
= icmpv6_nlattr_tuple_size
,
295 .nlattr_to_tuple
= icmpv6_nlattr_to_tuple
,
296 .nla_policy
= icmpv6_nla_policy
,
298 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
300 .nlattr_to_obj
= icmpv6_timeout_nlattr_to_obj
,
301 .obj_to_nlattr
= icmpv6_timeout_obj_to_nlattr
,
302 .nlattr_max
= CTA_TIMEOUT_ICMP_MAX
,
303 .obj_size
= sizeof(unsigned int),
304 .nla_policy
= icmpv6_timeout_nla_policy
,
306 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */