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 /* Actually only need first 4 bytes to get ports. */
58 hp = skb_header_pointer(skb, dataoff, 4, &_hdr);
62 tuple->src.u.udp.port = hp->source;
63 tuple->dst.u.udp.port = hp->dest;
67 static bool udplite_invert_tuple(struct nf_conntrack_tuple *tuple,
68 const struct nf_conntrack_tuple *orig)
70 tuple->src.u.udp.port = orig->dst.u.udp.port;
71 tuple->dst.u.udp.port = orig->src.u.udp.port;
75 /* Print out the per-protocol part of the tuple. */
76 static void udplite_print_tuple(struct seq_file *s,
77 const struct nf_conntrack_tuple *tuple)
79 seq_printf(s, "sport=%hu dport=%hu ",
80 ntohs(tuple->src.u.udp.port),
81 ntohs(tuple->dst.u.udp.port));
84 static unsigned int *udplite_get_timeouts(struct net *net)
86 return udplite_pernet(net)->timeouts;
89 /* Returns verdict for packet, and may modify conntracktype */
90 static int udplite_packet(struct nf_conn *ct,
91 const struct sk_buff *skb,
93 enum ip_conntrack_info ctinfo,
96 unsigned int *timeouts)
98 /* If we've seen traffic both ways, this is some kind of UDP
99 stream. Extend timeout. */
100 if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
101 nf_ct_refresh_acct(ct, ctinfo, skb,
102 timeouts[UDPLITE_CT_REPLIED]);
103 /* Also, more likely to be important, and not a probe */
104 if (!test_and_set_bit(IPS_ASSURED_BIT, &ct->status))
105 nf_conntrack_event_cache(IPCT_ASSURED, ct);
107 nf_ct_refresh_acct(ct, ctinfo, skb,
108 timeouts[UDPLITE_CT_UNREPLIED]);
113 /* Called when a new connection for this protocol found. */
114 static bool udplite_new(struct nf_conn *ct, const struct sk_buff *skb,
115 unsigned int dataoff, unsigned int *timeouts)
120 static int udplite_error(struct net *net, struct nf_conn *tmpl,
122 unsigned int dataoff,
123 enum ip_conntrack_info *ctinfo,
125 unsigned int hooknum)
127 unsigned int udplen = skb->len - dataoff;
128 const struct udphdr *hdr;
132 /* Header is too small? */
133 hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
135 if (LOG_INVALID(net, IPPROTO_UDPLITE))
136 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
137 "nf_ct_udplite: short packet ");
141 cscov = ntohs(hdr->len);
144 else if (cscov < sizeof(*hdr) || cscov > udplen) {
145 if (LOG_INVALID(net, IPPROTO_UDPLITE))
146 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
147 "nf_ct_udplite: invalid checksum coverage ");
151 /* UDPLITE mandates checksums */
153 if (LOG_INVALID(net, IPPROTO_UDPLITE))
154 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
155 "nf_ct_udplite: checksum missing ");
159 /* Checksum invalid? Ignore. */
160 if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
161 nf_checksum_partial(skb, hooknum, dataoff, cscov, IPPROTO_UDP,
163 if (LOG_INVALID(net, IPPROTO_UDPLITE))
164 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
165 "nf_ct_udplite: bad UDPLite checksum ");
172 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
174 #include <linux/netfilter/nfnetlink.h>
175 #include <linux/netfilter/nfnetlink_cttimeout.h>
177 static int udplite_timeout_nlattr_to_obj(struct nlattr *tb[],
178 struct net *net, void *data)
180 unsigned int *timeouts = data;
181 struct udplite_net *un = udplite_pernet(net);
183 /* set default timeouts for UDPlite. */
184 timeouts[UDPLITE_CT_UNREPLIED] = un->timeouts[UDPLITE_CT_UNREPLIED];
185 timeouts[UDPLITE_CT_REPLIED] = un->timeouts[UDPLITE_CT_REPLIED];
187 if (tb[CTA_TIMEOUT_UDPLITE_UNREPLIED]) {
188 timeouts[UDPLITE_CT_UNREPLIED] =
189 ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDPLITE_UNREPLIED])) * HZ;
191 if (tb[CTA_TIMEOUT_UDPLITE_REPLIED]) {
192 timeouts[UDPLITE_CT_REPLIED] =
193 ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDPLITE_REPLIED])) * HZ;
199 udplite_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
201 const unsigned int *timeouts = data;
203 if (nla_put_be32(skb, CTA_TIMEOUT_UDPLITE_UNREPLIED,
204 htonl(timeouts[UDPLITE_CT_UNREPLIED] / HZ)) ||
205 nla_put_be32(skb, CTA_TIMEOUT_UDPLITE_REPLIED,
206 htonl(timeouts[UDPLITE_CT_REPLIED] / HZ)))
207 goto nla_put_failure;
214 static const struct nla_policy
215 udplite_timeout_nla_policy[CTA_TIMEOUT_UDPLITE_MAX+1] = {
216 [CTA_TIMEOUT_UDPLITE_UNREPLIED] = { .type = NLA_U32 },
217 [CTA_TIMEOUT_UDPLITE_REPLIED] = { .type = NLA_U32 },
219 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
222 static struct ctl_table udplite_sysctl_table[] = {
224 .procname = "nf_conntrack_udplite_timeout",
225 .maxlen = sizeof(unsigned int),
227 .proc_handler = proc_dointvec_jiffies,
230 .procname = "nf_conntrack_udplite_timeout_stream",
231 .maxlen = sizeof(unsigned int),
233 .proc_handler = proc_dointvec_jiffies,
237 #endif /* CONFIG_SYSCTL */
239 static int udplite_kmemdup_sysctl_table(struct nf_proto_net *pn,
240 struct udplite_net *un)
246 pn->ctl_table = kmemdup(udplite_sysctl_table,
247 sizeof(udplite_sysctl_table),
252 pn->ctl_table[0].data = &un->timeouts[UDPLITE_CT_UNREPLIED];
253 pn->ctl_table[1].data = &un->timeouts[UDPLITE_CT_REPLIED];
258 static int udplite_init_net(struct net *net, u_int16_t proto)
260 struct udplite_net *un = udplite_pernet(net);
261 struct nf_proto_net *pn = &un->pn;
266 for (i = 0 ; i < UDPLITE_CT_MAX; i++)
267 un->timeouts[i] = udplite_timeouts[i];
270 return udplite_kmemdup_sysctl_table(pn, un);
273 static struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite4 __read_mostly =
276 .l4proto = IPPROTO_UDPLITE,
279 .pkt_to_tuple = udplite_pkt_to_tuple,
280 .invert_tuple = udplite_invert_tuple,
281 .print_tuple = udplite_print_tuple,
282 .packet = udplite_packet,
283 .get_timeouts = udplite_get_timeouts,
285 .error = udplite_error,
286 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
287 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
288 .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
289 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
290 .nla_policy = nf_ct_port_nla_policy,
292 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
294 .nlattr_to_obj = udplite_timeout_nlattr_to_obj,
295 .obj_to_nlattr = udplite_timeout_obj_to_nlattr,
296 .nlattr_max = CTA_TIMEOUT_UDPLITE_MAX,
297 .obj_size = sizeof(unsigned int) *
298 CTA_TIMEOUT_UDPLITE_MAX,
299 .nla_policy = udplite_timeout_nla_policy,
301 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
302 .net_id = &udplite_net_id,
303 .init_net = udplite_init_net,
306 static struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite6 __read_mostly =
309 .l4proto = IPPROTO_UDPLITE,
312 .pkt_to_tuple = udplite_pkt_to_tuple,
313 .invert_tuple = udplite_invert_tuple,
314 .print_tuple = udplite_print_tuple,
315 .packet = udplite_packet,
316 .get_timeouts = udplite_get_timeouts,
318 .error = udplite_error,
319 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
320 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
321 .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
322 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
323 .nla_policy = nf_ct_port_nla_policy,
325 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
327 .nlattr_to_obj = udplite_timeout_nlattr_to_obj,
328 .obj_to_nlattr = udplite_timeout_obj_to_nlattr,
329 .nlattr_max = CTA_TIMEOUT_UDPLITE_MAX,
330 .obj_size = sizeof(unsigned int) *
331 CTA_TIMEOUT_UDPLITE_MAX,
332 .nla_policy = udplite_timeout_nla_policy,
334 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
335 .net_id = &udplite_net_id,
336 .init_net = udplite_init_net,
339 static int udplite_net_init(struct net *net)
343 ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_udplite4);
345 pr_err("nf_conntrack_udplite4: pernet registration failed.\n");
348 ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_udplite6);
350 pr_err("nf_conntrack_udplite6: pernet registration failed.\n");
351 goto cleanup_udplite4;
356 nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_udplite4);
361 static void udplite_net_exit(struct net *net)
363 nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_udplite6);
364 nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_udplite4);
367 static struct pernet_operations udplite_net_ops = {
368 .init = udplite_net_init,
369 .exit = udplite_net_exit,
370 .id = &udplite_net_id,
371 .size = sizeof(struct udplite_net),
374 static int __init nf_conntrack_proto_udplite_init(void)
378 ret = register_pernet_subsys(&udplite_net_ops);
382 ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_udplite4);
386 ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_udplite6);
392 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udplite4);
394 unregister_pernet_subsys(&udplite_net_ops);
399 static void __exit nf_conntrack_proto_udplite_exit(void)
401 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udplite6);
402 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udplite4);
403 unregister_pernet_subsys(&udplite_net_ops);
406 module_init(nf_conntrack_proto_udplite_init);
407 module_exit(nf_conntrack_proto_udplite_exit);
409 MODULE_LICENSE("GPL");