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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> |
4 | * |
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. |
8 | */ |
9 | |
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> |
19 | |
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> |
26 | |
27 | static unsigned int nf_ct_udplite_timeout __read_mostly = 30*HZ; |
28 | static unsigned int nf_ct_udplite_timeout_stream __read_mostly = 180*HZ; |
29 | |
30 | static bool udplite_pkt_to_tuple(const struct sk_buff *skb, |
31 | unsigned int dataoff, |
32 | struct nf_conntrack_tuple *tuple) |
33 | { |
34 | const struct udphdr *hp; |
35 | struct udphdr _hdr; |
36 | |
37 | hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr); |
38 | if (hp == NULL) |
39 | return false; |
40 | |
41 | tuple->src.u.udp.port = hp->source; |
42 | tuple->dst.u.udp.port = hp->dest; |
43 | return true; |
44 | } |
45 | |
46 | static bool udplite_invert_tuple(struct nf_conntrack_tuple *tuple, |
47 | const struct nf_conntrack_tuple *orig) |
48 | { |
49 | tuple->src.u.udp.port = orig->dst.u.udp.port; |
50 | tuple->dst.u.udp.port = orig->src.u.udp.port; |
51 | return true; |
52 | } |
53 | |
54 | /* Print out the per-protocol part of the tuple. */ |
55 | static int udplite_print_tuple(struct seq_file *s, |
56 | const struct nf_conntrack_tuple *tuple) |
57 | { |
58 | return seq_printf(s, "sport=%hu dport=%hu ", |
59 | ntohs(tuple->src.u.udp.port), |
60 | ntohs(tuple->dst.u.udp.port)); |
61 | } |
62 | |
63 | /* Returns verdict for packet, and may modify conntracktype */ |
64 | static int udplite_packet(struct nf_conn *ct, |
65 | const struct sk_buff *skb, |
66 | unsigned int dataoff, |
67 | enum ip_conntrack_info ctinfo, |
68 | u_int8_t pf, |
69 | unsigned int hooknum) |
70 | { |
71 | /* If we've seen traffic both ways, this is some kind of UDP |
72 | stream. Extend timeout. */ |
73 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { |
74 | nf_ct_refresh_acct(ct, ctinfo, skb, |
75 | nf_ct_udplite_timeout_stream); |
76 | /* Also, more likely to be important, and not a probe */ |
77 | if (!test_and_set_bit(IPS_ASSURED_BIT, &ct->status)) |
78 | nf_conntrack_event_cache(IPCT_ASSURED, ct); |
79 | } else |
80 | nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_udplite_timeout); |
81 | |
82 | return NF_ACCEPT; |
83 | } |
84 | |
85 | /* Called when a new connection for this protocol found. */ |
86 | static bool udplite_new(struct nf_conn *ct, const struct sk_buff *skb, |
87 | unsigned int dataoff) |
88 | { |
89 | return true; |
90 | } |
91 | |
92 | static int udplite_error(struct net *net, struct nf_conn *tmpl, |
93 | struct sk_buff *skb, |
94 | unsigned int dataoff, |
95 | enum ip_conntrack_info *ctinfo, |
96 | u_int8_t pf, |
97 | unsigned int hooknum) |
98 | { |
99 | unsigned int udplen = skb->len - dataoff; |
100 | const struct udphdr *hdr; |
101 | struct udphdr _hdr; |
102 | unsigned int cscov; |
103 | |
104 | /* Header is too small? */ |
105 | hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr); |
106 | if (hdr == NULL) { |
107 | if (LOG_INVALID(net, IPPROTO_UDPLITE)) |
108 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
109 | "nf_ct_udplite: short packet "); |
110 | return -NF_ACCEPT; |
111 | } |
112 | |
113 | cscov = ntohs(hdr->len); |
114 | if (cscov == 0) |
115 | cscov = udplen; |
116 | else if (cscov < sizeof(*hdr) || cscov > udplen) { |
117 | if (LOG_INVALID(net, IPPROTO_UDPLITE)) |
118 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
119 | "nf_ct_udplite: invalid checksum coverage "); |
120 | return -NF_ACCEPT; |
121 | } |
122 | |
123 | /* UDPLITE mandates checksums */ |
124 | if (!hdr->check) { |
125 | if (LOG_INVALID(net, IPPROTO_UDPLITE)) |
126 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
127 | "nf_ct_udplite: checksum missing "); |
128 | return -NF_ACCEPT; |
129 | } |
130 | |
131 | /* Checksum invalid? Ignore. */ |
132 | if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING && |
133 | nf_checksum_partial(skb, hooknum, dataoff, cscov, IPPROTO_UDP, |
134 | pf)) { |
135 | if (LOG_INVALID(net, IPPROTO_UDPLITE)) |
136 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
137 | "nf_ct_udplite: bad UDPLite checksum "); |
138 | return -NF_ACCEPT; |
139 | } |
140 | |
141 | return NF_ACCEPT; |
142 | } |
143 | |
144 | #ifdef CONFIG_SYSCTL |
145 | static unsigned int udplite_sysctl_table_users; |
146 | static struct ctl_table_header *udplite_sysctl_header; |
147 | static struct ctl_table udplite_sysctl_table[] = { |
148 | { |
149 | .procname = "nf_conntrack_udplite_timeout", |
150 | .data = &nf_ct_udplite_timeout, |
151 | .maxlen = sizeof(unsigned int), |
152 | .mode = 0644, |
153 | .proc_handler = proc_dointvec_jiffies, |
154 | }, |
155 | { |
156 | .procname = "nf_conntrack_udplite_timeout_stream", |
157 | .data = &nf_ct_udplite_timeout_stream, |
158 | .maxlen = sizeof(unsigned int), |
159 | .mode = 0644, |
160 | .proc_handler = proc_dointvec_jiffies, |
161 | }, |
162 | { } |
163 | }; |
164 | #endif /* CONFIG_SYSCTL */ |
165 | |
166 | static struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite4 __read_mostly = |
167 | { |
168 | .l3proto = PF_INET, |
169 | .l4proto = IPPROTO_UDPLITE, |
170 | .name = "udplite", |
171 | .pkt_to_tuple = udplite_pkt_to_tuple, |
172 | .invert_tuple = udplite_invert_tuple, |
173 | .print_tuple = udplite_print_tuple, |
174 | .packet = udplite_packet, |
175 | .new = udplite_new, |
176 | .error = udplite_error, |
177 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
178 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
179 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
180 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
181 | .nla_policy = nf_ct_port_nla_policy, |
182 | #endif |
183 | #ifdef CONFIG_SYSCTL |
184 | .ctl_table_users = &udplite_sysctl_table_users, |
185 | .ctl_table_header = &udplite_sysctl_header, |
186 | .ctl_table = udplite_sysctl_table, |
187 | #endif |
188 | }; |
189 | |
190 | static struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite6 __read_mostly = |
191 | { |
192 | .l3proto = PF_INET6, |
193 | .l4proto = IPPROTO_UDPLITE, |
194 | .name = "udplite", |
195 | .pkt_to_tuple = udplite_pkt_to_tuple, |
196 | .invert_tuple = udplite_invert_tuple, |
197 | .print_tuple = udplite_print_tuple, |
198 | .packet = udplite_packet, |
199 | .new = udplite_new, |
200 | .error = udplite_error, |
201 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
202 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
203 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
204 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
205 | .nla_policy = nf_ct_port_nla_policy, |
206 | #endif |
207 | #ifdef CONFIG_SYSCTL |
208 | .ctl_table_users = &udplite_sysctl_table_users, |
209 | .ctl_table_header = &udplite_sysctl_header, |
210 | .ctl_table = udplite_sysctl_table, |
211 | #endif |
212 | }; |
213 | |
214 | static int __init nf_conntrack_proto_udplite_init(void) |
215 | { |
216 | int err; |
217 | |
218 | err = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_udplite4); |
219 | if (err < 0) |
220 | goto err1; |
221 | err = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_udplite6); |
222 | if (err < 0) |
223 | goto err2; |
224 | return 0; |
225 | err2: |
226 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_udplite4); |
227 | err1: |
228 | return err; |
229 | } |
230 | |
231 | static void __exit nf_conntrack_proto_udplite_exit(void) |
232 | { |
233 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_udplite6); |
234 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_udplite4); |
235 | } |
236 | |
237 | module_init(nf_conntrack_proto_udplite_init); |
238 | module_exit(nf_conntrack_proto_udplite_exit); |
239 | |
240 | MODULE_LICENSE("GPL"); |
241 |
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