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 int udplite_net_id __read_mostly;
40 struct nf_proto_net pn;
41 unsigned int timeouts[UDPLITE_CT_MAX];
44 static inline struct udplite_net *udplite_pernet(struct net *net)
46 return net_generic(net, udplite_net_id);
49 static bool udplite_pkt_to_tuple(const struct sk_buff *skb,
52 struct nf_conntrack_tuple *tuple)
54 const struct udphdr *hp;
57 hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
61 tuple->src.u.udp.port = hp->source;
62 tuple->dst.u.udp.port = hp->dest;
66 static bool udplite_invert_tuple(struct nf_conntrack_tuple *tuple,
67 const struct nf_conntrack_tuple *orig)
69 tuple->src.u.udp.port = orig->dst.u.udp.port;
70 tuple->dst.u.udp.port = orig->src.u.udp.port;
74 /* Print out the per-protocol part of the tuple. */
75 static void udplite_print_tuple(struct seq_file *s,
76 const struct nf_conntrack_tuple *tuple)
78 seq_printf(s, "sport=%hu dport=%hu ",
79 ntohs(tuple->src.u.udp.port),
80 ntohs(tuple->dst.u.udp.port));
83 static unsigned int *udplite_get_timeouts(struct net *net)
85 return udplite_pernet(net)->timeouts;
88 /* Returns verdict for packet, and may modify conntracktype */
89 static int udplite_packet(struct nf_conn *ct,
90 const struct sk_buff *skb,
92 enum ip_conntrack_info ctinfo,
95 unsigned int *timeouts)
97 /* If we've seen traffic both ways, this is some kind of UDP
98 stream. Extend timeout. */
99 if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
100 nf_ct_refresh_acct(ct, ctinfo, skb,
101 timeouts[UDPLITE_CT_REPLIED]);
102 /* Also, more likely to be important, and not a probe */
103 if (!test_and_set_bit(IPS_ASSURED_BIT, &ct->status))
104 nf_conntrack_event_cache(IPCT_ASSURED, ct);
106 nf_ct_refresh_acct(ct, ctinfo, skb,
107 timeouts[UDPLITE_CT_UNREPLIED]);
112 /* Called when a new connection for this protocol found. */
113 static bool udplite_new(struct nf_conn *ct, const struct sk_buff *skb,
114 unsigned int dataoff, unsigned int *timeouts)
119 static int udplite_error(struct net *net, struct nf_conn *tmpl,
121 unsigned int dataoff,
122 enum ip_conntrack_info *ctinfo,
124 unsigned int hooknum)
126 unsigned int udplen = skb->len - dataoff;
127 const struct udphdr *hdr;
131 /* Header is too small? */
132 hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
134 if (LOG_INVALID(net, IPPROTO_UDPLITE))
135 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
136 "nf_ct_udplite: short packet ");
140 cscov = ntohs(hdr->len);
143 else if (cscov < sizeof(*hdr) || cscov > udplen) {
144 if (LOG_INVALID(net, IPPROTO_UDPLITE))
145 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
146 "nf_ct_udplite: invalid checksum coverage ");
150 /* UDPLITE mandates checksums */
152 if (LOG_INVALID(net, IPPROTO_UDPLITE))
153 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
154 "nf_ct_udplite: checksum missing ");
158 /* Checksum invalid? Ignore. */
159 if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
160 nf_checksum_partial(skb, hooknum, dataoff, cscov, IPPROTO_UDP,
162 if (LOG_INVALID(net, IPPROTO_UDPLITE))
163 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
164 "nf_ct_udplite: bad UDPLite checksum ");
171 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
173 #include <linux/netfilter/nfnetlink.h>
174 #include <linux/netfilter/nfnetlink_cttimeout.h>
176 static int udplite_timeout_nlattr_to_obj(struct nlattr *tb[],
177 struct net *net, void *data)
179 unsigned int *timeouts = data;
180 struct udplite_net *un = udplite_pernet(net);
182 /* set default timeouts for UDPlite. */
183 timeouts[UDPLITE_CT_UNREPLIED] = un->timeouts[UDPLITE_CT_UNREPLIED];
184 timeouts[UDPLITE_CT_REPLIED] = un->timeouts[UDPLITE_CT_REPLIED];
186 if (tb[CTA_TIMEOUT_UDPLITE_UNREPLIED]) {
187 timeouts[UDPLITE_CT_UNREPLIED] =
188 ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDPLITE_UNREPLIED])) * HZ;
190 if (tb[CTA_TIMEOUT_UDPLITE_REPLIED]) {
191 timeouts[UDPLITE_CT_REPLIED] =
192 ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDPLITE_REPLIED])) * HZ;
198 udplite_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
200 const unsigned int *timeouts = data;
202 if (nla_put_be32(skb, CTA_TIMEOUT_UDPLITE_UNREPLIED,
203 htonl(timeouts[UDPLITE_CT_UNREPLIED] / HZ)) ||
204 nla_put_be32(skb, CTA_TIMEOUT_UDPLITE_REPLIED,
205 htonl(timeouts[UDPLITE_CT_REPLIED] / HZ)))
206 goto nla_put_failure;
213 static const struct nla_policy
214 udplite_timeout_nla_policy[CTA_TIMEOUT_UDPLITE_MAX+1] = {
215 [CTA_TIMEOUT_UDPLITE_UNREPLIED] = { .type = NLA_U32 },
216 [CTA_TIMEOUT_UDPLITE_REPLIED] = { .type = NLA_U32 },
218 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
221 static struct ctl_table udplite_sysctl_table[] = {
223 .procname = "nf_conntrack_udplite_timeout",
224 .maxlen = sizeof(unsigned int),
226 .proc_handler = proc_dointvec_jiffies,
229 .procname = "nf_conntrack_udplite_timeout_stream",
230 .maxlen = sizeof(unsigned int),
232 .proc_handler = proc_dointvec_jiffies,
236 #endif /* CONFIG_SYSCTL */
238 static int udplite_kmemdup_sysctl_table(struct nf_proto_net *pn,
239 struct udplite_net *un)
245 pn->ctl_table = kmemdup(udplite_sysctl_table,
246 sizeof(udplite_sysctl_table),
251 pn->ctl_table[0].data = &un->timeouts[UDPLITE_CT_UNREPLIED];
252 pn->ctl_table[1].data = &un->timeouts[UDPLITE_CT_REPLIED];
257 static int udplite_init_net(struct net *net, u_int16_t proto)
259 struct udplite_net *un = udplite_pernet(net);
260 struct nf_proto_net *pn = &un->pn;
265 for (i = 0 ; i < UDPLITE_CT_MAX; i++)
266 un->timeouts[i] = udplite_timeouts[i];
269 return udplite_kmemdup_sysctl_table(pn, un);
272 static struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite4 __read_mostly =
275 .l4proto = IPPROTO_UDPLITE,
277 .pkt_to_tuple = udplite_pkt_to_tuple,
278 .invert_tuple = udplite_invert_tuple,
279 .print_tuple = udplite_print_tuple,
280 .packet = udplite_packet,
281 .get_timeouts = udplite_get_timeouts,
283 .error = udplite_error,
284 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
285 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
286 .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
287 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
288 .nla_policy = nf_ct_port_nla_policy,
290 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
292 .nlattr_to_obj = udplite_timeout_nlattr_to_obj,
293 .obj_to_nlattr = udplite_timeout_obj_to_nlattr,
294 .nlattr_max = CTA_TIMEOUT_UDPLITE_MAX,
295 .obj_size = sizeof(unsigned int) *
296 CTA_TIMEOUT_UDPLITE_MAX,
297 .nla_policy = udplite_timeout_nla_policy,
299 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
300 .net_id = &udplite_net_id,
301 .init_net = udplite_init_net,
304 static struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite6 __read_mostly =
307 .l4proto = IPPROTO_UDPLITE,
309 .pkt_to_tuple = udplite_pkt_to_tuple,
310 .invert_tuple = udplite_invert_tuple,
311 .print_tuple = udplite_print_tuple,
312 .packet = udplite_packet,
313 .get_timeouts = udplite_get_timeouts,
315 .error = udplite_error,
316 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
317 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
318 .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
319 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
320 .nla_policy = nf_ct_port_nla_policy,
322 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
324 .nlattr_to_obj = udplite_timeout_nlattr_to_obj,
325 .obj_to_nlattr = udplite_timeout_obj_to_nlattr,
326 .nlattr_max = CTA_TIMEOUT_UDPLITE_MAX,
327 .obj_size = sizeof(unsigned int) *
328 CTA_TIMEOUT_UDPLITE_MAX,
329 .nla_policy = udplite_timeout_nla_policy,
331 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
332 .net_id = &udplite_net_id,
333 .init_net = udplite_init_net,
336 static int udplite_net_init(struct net *net)
340 ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_udplite4);
342 pr_err("nf_conntrack_udplite4: pernet registration failed.\n");
345 ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_udplite6);
347 pr_err("nf_conntrack_udplite6: pernet registration failed.\n");
348 goto cleanup_udplite4;
353 nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_udplite4);
358 static void udplite_net_exit(struct net *net)
360 nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_udplite6);
361 nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_udplite4);
364 static struct pernet_operations udplite_net_ops = {
365 .init = udplite_net_init,
366 .exit = udplite_net_exit,
367 .id = &udplite_net_id,
368 .size = sizeof(struct udplite_net),
371 static int __init nf_conntrack_proto_udplite_init(void)
375 ret = register_pernet_subsys(&udplite_net_ops);
379 ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_udplite4);
383 ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_udplite6);
389 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udplite4);
391 unregister_pernet_subsys(&udplite_net_ops);
396 static void __exit nf_conntrack_proto_udplite_exit(void)
398 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udplite6);
399 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udplite4);
400 unregister_pernet_subsys(&udplite_net_ops);
403 module_init(nf_conntrack_proto_udplite_init);
404 module_exit(nf_conntrack_proto_udplite_exit);
406 MODULE_LICENSE("GPL");