1 /* (C) 1999-2001 Paul `Rusty' Russell
2 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
3 * (C) 2007 Patrick McHardy <kaber@trash.net>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
10 #include <linux/types.h>
11 #include <linux/timer.h>
12 #include <linux/module.h>
13 #include <linux/udp.h>
14 #include <linux/seq_file.h>
15 #include <linux/skbuff.h>
16 #include <linux/ipv6.h>
17 #include <net/ip6_checksum.h>
18 #include <net/checksum.h>
20 #include <linux/netfilter.h>
21 #include <linux/netfilter_ipv4.h>
22 #include <linux/netfilter_ipv6.h>
23 #include <net/netfilter/nf_conntrack_l4proto.h>
24 #include <net/netfilter/nf_conntrack_ecache.h>
25 #include <net/netfilter/nf_log.h>
27 enum udplite_conntrack
{
33 static unsigned int udplite_timeouts
[UDPLITE_CT_MAX
] = {
34 [UDPLITE_CT_UNREPLIED
] = 30*HZ
,
35 [UDPLITE_CT_REPLIED
] = 180*HZ
,
38 static bool udplite_pkt_to_tuple(const struct sk_buff
*skb
,
40 struct nf_conntrack_tuple
*tuple
)
42 const struct udphdr
*hp
;
45 hp
= skb_header_pointer(skb
, dataoff
, sizeof(_hdr
), &_hdr
);
49 tuple
->src
.u
.udp
.port
= hp
->source
;
50 tuple
->dst
.u
.udp
.port
= hp
->dest
;
54 static bool udplite_invert_tuple(struct nf_conntrack_tuple
*tuple
,
55 const struct nf_conntrack_tuple
*orig
)
57 tuple
->src
.u
.udp
.port
= orig
->dst
.u
.udp
.port
;
58 tuple
->dst
.u
.udp
.port
= orig
->src
.u
.udp
.port
;
62 /* Print out the per-protocol part of the tuple. */
63 static int udplite_print_tuple(struct seq_file
*s
,
64 const struct nf_conntrack_tuple
*tuple
)
66 return seq_printf(s
, "sport=%hu dport=%hu ",
67 ntohs(tuple
->src
.u
.udp
.port
),
68 ntohs(tuple
->dst
.u
.udp
.port
));
71 static unsigned int *udplite_get_timeouts(struct net
*net
)
73 return udplite_timeouts
;
76 /* Returns verdict for packet, and may modify conntracktype */
77 static int udplite_packet(struct nf_conn
*ct
,
78 const struct sk_buff
*skb
,
80 enum ip_conntrack_info ctinfo
,
83 unsigned int *timeouts
)
85 /* If we've seen traffic both ways, this is some kind of UDP
86 stream. Extend timeout. */
87 if (test_bit(IPS_SEEN_REPLY_BIT
, &ct
->status
)) {
88 nf_ct_refresh_acct(ct
, ctinfo
, skb
,
89 timeouts
[UDPLITE_CT_REPLIED
]);
90 /* Also, more likely to be important, and not a probe */
91 if (!test_and_set_bit(IPS_ASSURED_BIT
, &ct
->status
))
92 nf_conntrack_event_cache(IPCT_ASSURED
, ct
);
94 nf_ct_refresh_acct(ct
, ctinfo
, skb
,
95 timeouts
[UDPLITE_CT_UNREPLIED
]);
100 /* Called when a new connection for this protocol found. */
101 static bool udplite_new(struct nf_conn
*ct
, const struct sk_buff
*skb
,
102 unsigned int dataoff
, unsigned int *timeouts
)
107 static int udplite_error(struct net
*net
, struct nf_conn
*tmpl
,
109 unsigned int dataoff
,
110 enum ip_conntrack_info
*ctinfo
,
112 unsigned int hooknum
)
114 unsigned int udplen
= skb
->len
- dataoff
;
115 const struct udphdr
*hdr
;
119 /* Header is too small? */
120 hdr
= skb_header_pointer(skb
, dataoff
, sizeof(_hdr
), &_hdr
);
122 if (LOG_INVALID(net
, IPPROTO_UDPLITE
))
123 nf_log_packet(pf
, 0, skb
, NULL
, NULL
, NULL
,
124 "nf_ct_udplite: short packet ");
128 cscov
= ntohs(hdr
->len
);
131 else if (cscov
< sizeof(*hdr
) || cscov
> udplen
) {
132 if (LOG_INVALID(net
, IPPROTO_UDPLITE
))
133 nf_log_packet(pf
, 0, skb
, NULL
, NULL
, NULL
,
134 "nf_ct_udplite: invalid checksum coverage ");
138 /* UDPLITE mandates checksums */
140 if (LOG_INVALID(net
, IPPROTO_UDPLITE
))
141 nf_log_packet(pf
, 0, skb
, NULL
, NULL
, NULL
,
142 "nf_ct_udplite: checksum missing ");
146 /* Checksum invalid? Ignore. */
147 if (net
->ct
.sysctl_checksum
&& hooknum
== NF_INET_PRE_ROUTING
&&
148 nf_checksum_partial(skb
, hooknum
, dataoff
, cscov
, IPPROTO_UDP
,
150 if (LOG_INVALID(net
, IPPROTO_UDPLITE
))
151 nf_log_packet(pf
, 0, skb
, NULL
, NULL
, NULL
,
152 "nf_ct_udplite: bad UDPLite checksum ");
159 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
161 #include <linux/netfilter/nfnetlink.h>
162 #include <linux/netfilter/nfnetlink_cttimeout.h>
164 static int udplite_timeout_nlattr_to_obj(struct nlattr
*tb
[], void *data
)
166 unsigned int *timeouts
= data
;
168 /* set default timeouts for UDPlite. */
169 timeouts
[UDPLITE_CT_UNREPLIED
] = udplite_timeouts
[UDPLITE_CT_UNREPLIED
];
170 timeouts
[UDPLITE_CT_REPLIED
] = udplite_timeouts
[UDPLITE_CT_REPLIED
];
172 if (tb
[CTA_TIMEOUT_UDPLITE_UNREPLIED
]) {
173 timeouts
[UDPLITE_CT_UNREPLIED
] =
174 ntohl(nla_get_be32(tb
[CTA_TIMEOUT_UDPLITE_UNREPLIED
])) * HZ
;
176 if (tb
[CTA_TIMEOUT_UDPLITE_REPLIED
]) {
177 timeouts
[UDPLITE_CT_REPLIED
] =
178 ntohl(nla_get_be32(tb
[CTA_TIMEOUT_UDPLITE_REPLIED
])) * HZ
;
184 udplite_timeout_obj_to_nlattr(struct sk_buff
*skb
, const void *data
)
186 const unsigned int *timeouts
= data
;
188 NLA_PUT_BE32(skb
, CTA_TIMEOUT_UDPLITE_UNREPLIED
,
189 htonl(timeouts
[UDPLITE_CT_UNREPLIED
] / HZ
));
190 NLA_PUT_BE32(skb
, CTA_TIMEOUT_UDPLITE_REPLIED
,
191 htonl(timeouts
[UDPLITE_CT_REPLIED
] / HZ
));
198 static const struct nla_policy
199 udplite_timeout_nla_policy
[CTA_TIMEOUT_UDPLITE_MAX
+1] = {
200 [CTA_TIMEOUT_UDPLITE_UNREPLIED
] = { .type
= NLA_U32
},
201 [CTA_TIMEOUT_UDPLITE_REPLIED
] = { .type
= NLA_U32
},
203 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
206 static unsigned int udplite_sysctl_table_users
;
207 static struct ctl_table_header
*udplite_sysctl_header
;
208 static struct ctl_table udplite_sysctl_table
[] = {
210 .procname
= "nf_conntrack_udplite_timeout",
211 .data
= &udplite_timeouts
[UDPLITE_CT_UNREPLIED
],
212 .maxlen
= sizeof(unsigned int),
214 .proc_handler
= proc_dointvec_jiffies
,
217 .procname
= "nf_conntrack_udplite_timeout_stream",
218 .data
= &udplite_timeouts
[UDPLITE_CT_REPLIED
],
219 .maxlen
= sizeof(unsigned int),
221 .proc_handler
= proc_dointvec_jiffies
,
225 #endif /* CONFIG_SYSCTL */
227 static struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite4 __read_mostly
=
230 .l4proto
= IPPROTO_UDPLITE
,
232 .pkt_to_tuple
= udplite_pkt_to_tuple
,
233 .invert_tuple
= udplite_invert_tuple
,
234 .print_tuple
= udplite_print_tuple
,
235 .packet
= udplite_packet
,
236 .get_timeouts
= udplite_get_timeouts
,
238 .error
= udplite_error
,
239 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
240 .tuple_to_nlattr
= nf_ct_port_tuple_to_nlattr
,
241 .nlattr_tuple_size
= nf_ct_port_nlattr_tuple_size
,
242 .nlattr_to_tuple
= nf_ct_port_nlattr_to_tuple
,
243 .nla_policy
= nf_ct_port_nla_policy
,
245 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
247 .nlattr_to_obj
= udplite_timeout_nlattr_to_obj
,
248 .obj_to_nlattr
= udplite_timeout_obj_to_nlattr
,
249 .nlattr_max
= CTA_TIMEOUT_UDPLITE_MAX
,
250 .obj_size
= sizeof(unsigned int) *
251 CTA_TIMEOUT_UDPLITE_MAX
,
252 .nla_policy
= udplite_timeout_nla_policy
,
254 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
256 .ctl_table_users
= &udplite_sysctl_table_users
,
257 .ctl_table_header
= &udplite_sysctl_header
,
258 .ctl_table
= udplite_sysctl_table
,
262 static struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite6 __read_mostly
=
265 .l4proto
= IPPROTO_UDPLITE
,
267 .pkt_to_tuple
= udplite_pkt_to_tuple
,
268 .invert_tuple
= udplite_invert_tuple
,
269 .print_tuple
= udplite_print_tuple
,
270 .packet
= udplite_packet
,
271 .get_timeouts
= udplite_get_timeouts
,
273 .error
= udplite_error
,
274 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
275 .tuple_to_nlattr
= nf_ct_port_tuple_to_nlattr
,
276 .nlattr_tuple_size
= nf_ct_port_nlattr_tuple_size
,
277 .nlattr_to_tuple
= nf_ct_port_nlattr_to_tuple
,
278 .nla_policy
= nf_ct_port_nla_policy
,
280 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
282 .nlattr_to_obj
= udplite_timeout_nlattr_to_obj
,
283 .obj_to_nlattr
= udplite_timeout_obj_to_nlattr
,
284 .nlattr_max
= CTA_TIMEOUT_UDPLITE_MAX
,
285 .obj_size
= sizeof(unsigned int) *
286 CTA_TIMEOUT_UDPLITE_MAX
,
287 .nla_policy
= udplite_timeout_nla_policy
,
289 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
291 .ctl_table_users
= &udplite_sysctl_table_users
,
292 .ctl_table_header
= &udplite_sysctl_header
,
293 .ctl_table
= udplite_sysctl_table
,
297 static int __init
nf_conntrack_proto_udplite_init(void)
301 err
= nf_conntrack_l4proto_register(&nf_conntrack_l4proto_udplite4
);
304 err
= nf_conntrack_l4proto_register(&nf_conntrack_l4proto_udplite6
);
309 nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_udplite4
);
314 static void __exit
nf_conntrack_proto_udplite_exit(void)
316 nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_udplite6
);
317 nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_udplite4
);
320 module_init(nf_conntrack_proto_udplite_init
);
321 module_exit(nf_conntrack_proto_udplite_exit
);
323 MODULE_LICENSE("GPL");