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1 | /* (C) 1999-2001 Paul `Rusty' Russell |
2 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> |
3 | * (C) 2006-2012 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 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> |
27 | #include <net/netfilter/ipv6/nf_conntrack_ipv6.h> |
28 | |
29 | static unsigned int udp_timeouts[UDP_CT_MAX] = { |
30 | [UDP_CT_UNREPLIED] = 30*HZ, |
31 | [UDP_CT_REPLIED] = 180*HZ, |
32 | }; |
33 | |
34 | static inline struct nf_udp_net *udp_pernet(struct net *net) |
35 | { |
36 | return &net->ct.nf_ct_proto.udp; |
37 | } |
38 | |
39 | static bool udp_pkt_to_tuple(const struct sk_buff *skb, |
40 | unsigned int dataoff, |
41 | struct nf_conntrack_tuple *tuple) |
42 | { |
43 | const struct udphdr *hp; |
44 | struct udphdr _hdr; |
45 | |
46 | /* Actually only need first 8 bytes. */ |
47 | hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr); |
48 | if (hp == NULL) |
49 | return false; |
50 | |
51 | tuple->src.u.udp.port = hp->source; |
52 | tuple->dst.u.udp.port = hp->dest; |
53 | |
54 | return true; |
55 | } |
56 | |
57 | static bool udp_invert_tuple(struct nf_conntrack_tuple *tuple, |
58 | const struct nf_conntrack_tuple *orig) |
59 | { |
60 | tuple->src.u.udp.port = orig->dst.u.udp.port; |
61 | tuple->dst.u.udp.port = orig->src.u.udp.port; |
62 | return true; |
63 | } |
64 | |
65 | /* Print out the per-protocol part of the tuple. */ |
66 | static int udp_print_tuple(struct seq_file *s, |
67 | const struct nf_conntrack_tuple *tuple) |
68 | { |
69 | return seq_printf(s, "sport=%hu dport=%hu ", |
70 | ntohs(tuple->src.u.udp.port), |
71 | ntohs(tuple->dst.u.udp.port)); |
72 | } |
73 | |
74 | static unsigned int *udp_get_timeouts(struct net *net) |
75 | { |
76 | return udp_pernet(net)->timeouts; |
77 | } |
78 | |
79 | /* Returns verdict for packet, and may modify conntracktype */ |
80 | static int udp_packet(struct nf_conn *ct, |
81 | const struct sk_buff *skb, |
82 | unsigned int dataoff, |
83 | enum ip_conntrack_info ctinfo, |
84 | u_int8_t pf, |
85 | unsigned int hooknum, |
86 | unsigned int *timeouts) |
87 | { |
88 | /* If we've seen traffic both ways, this is some kind of UDP |
89 | stream. Extend timeout. */ |
90 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { |
91 | nf_ct_refresh_acct(ct, ctinfo, skb, |
92 | timeouts[UDP_CT_REPLIED]); |
93 | /* Also, more likely to be important, and not a probe */ |
94 | if (!test_and_set_bit(IPS_ASSURED_BIT, &ct->status)) |
95 | nf_conntrack_event_cache(IPCT_ASSURED, ct); |
96 | } else { |
97 | nf_ct_refresh_acct(ct, ctinfo, skb, |
98 | timeouts[UDP_CT_UNREPLIED]); |
99 | } |
100 | return NF_ACCEPT; |
101 | } |
102 | |
103 | /* Called when a new connection for this protocol found. */ |
104 | static bool udp_new(struct nf_conn *ct, const struct sk_buff *skb, |
105 | unsigned int dataoff, unsigned int *timeouts) |
106 | { |
107 | return true; |
108 | } |
109 | |
110 | static int udp_error(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb, |
111 | unsigned int dataoff, enum ip_conntrack_info *ctinfo, |
112 | u_int8_t pf, |
113 | unsigned int hooknum) |
114 | { |
115 | unsigned int udplen = skb->len - dataoff; |
116 | const struct udphdr *hdr; |
117 | struct udphdr _hdr; |
118 | |
119 | /* Header is too small? */ |
120 | hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr); |
121 | if (hdr == NULL) { |
122 | if (LOG_INVALID(net, IPPROTO_UDP)) |
123 | nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, |
124 | "nf_ct_udp: short packet "); |
125 | return -NF_ACCEPT; |
126 | } |
127 | |
128 | /* Truncated/malformed packets */ |
129 | if (ntohs(hdr->len) > udplen || ntohs(hdr->len) < sizeof(*hdr)) { |
130 | if (LOG_INVALID(net, IPPROTO_UDP)) |
131 | nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, |
132 | "nf_ct_udp: truncated/malformed packet "); |
133 | return -NF_ACCEPT; |
134 | } |
135 | |
136 | /* Packet with no checksum */ |
137 | if (!hdr->check) |
138 | return NF_ACCEPT; |
139 | |
140 | /* Checksum invalid? Ignore. |
141 | * We skip checking packets on the outgoing path |
142 | * because the checksum is assumed to be correct. |
143 | * FIXME: Source route IP option packets --RR */ |
144 | if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING && |
145 | nf_checksum(skb, hooknum, dataoff, IPPROTO_UDP, pf)) { |
146 | if (LOG_INVALID(net, IPPROTO_UDP)) |
147 | nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, |
148 | "nf_ct_udp: bad UDP checksum "); |
149 | return -NF_ACCEPT; |
150 | } |
151 | |
152 | return NF_ACCEPT; |
153 | } |
154 | |
155 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
156 | |
157 | #include <linux/netfilter/nfnetlink.h> |
158 | #include <linux/netfilter/nfnetlink_cttimeout.h> |
159 | |
160 | static int udp_timeout_nlattr_to_obj(struct nlattr *tb[], |
161 | struct net *net, void *data) |
162 | { |
163 | unsigned int *timeouts = data; |
164 | struct nf_udp_net *un = udp_pernet(net); |
165 | |
166 | /* set default timeouts for UDP. */ |
167 | timeouts[UDP_CT_UNREPLIED] = un->timeouts[UDP_CT_UNREPLIED]; |
168 | timeouts[UDP_CT_REPLIED] = un->timeouts[UDP_CT_REPLIED]; |
169 | |
170 | if (tb[CTA_TIMEOUT_UDP_UNREPLIED]) { |
171 | timeouts[UDP_CT_UNREPLIED] = |
172 | ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDP_UNREPLIED])) * HZ; |
173 | } |
174 | if (tb[CTA_TIMEOUT_UDP_REPLIED]) { |
175 | timeouts[UDP_CT_REPLIED] = |
176 | ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDP_REPLIED])) * HZ; |
177 | } |
178 | return 0; |
179 | } |
180 | |
181 | static int |
182 | udp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) |
183 | { |
184 | const unsigned int *timeouts = data; |
185 | |
186 | if (nla_put_be32(skb, CTA_TIMEOUT_UDP_UNREPLIED, |
187 | htonl(timeouts[UDP_CT_UNREPLIED] / HZ)) || |
188 | nla_put_be32(skb, CTA_TIMEOUT_UDP_REPLIED, |
189 | htonl(timeouts[UDP_CT_REPLIED] / HZ))) |
190 | goto nla_put_failure; |
191 | return 0; |
192 | |
193 | nla_put_failure: |
194 | return -ENOSPC; |
195 | } |
196 | |
197 | static const struct nla_policy |
198 | udp_timeout_nla_policy[CTA_TIMEOUT_UDP_MAX+1] = { |
199 | [CTA_TIMEOUT_UDP_UNREPLIED] = { .type = NLA_U32 }, |
200 | [CTA_TIMEOUT_UDP_REPLIED] = { .type = NLA_U32 }, |
201 | }; |
202 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ |
203 | |
204 | #ifdef CONFIG_SYSCTL |
205 | static struct ctl_table udp_sysctl_table[] = { |
206 | { |
207 | .procname = "nf_conntrack_udp_timeout", |
208 | .maxlen = sizeof(unsigned int), |
209 | .mode = 0644, |
210 | .proc_handler = proc_dointvec_jiffies, |
211 | }, |
212 | { |
213 | .procname = "nf_conntrack_udp_timeout_stream", |
214 | .maxlen = sizeof(unsigned int), |
215 | .mode = 0644, |
216 | .proc_handler = proc_dointvec_jiffies, |
217 | }, |
218 | { } |
219 | }; |
220 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
221 | static struct ctl_table udp_compat_sysctl_table[] = { |
222 | { |
223 | .procname = "ip_conntrack_udp_timeout", |
224 | .maxlen = sizeof(unsigned int), |
225 | .mode = 0644, |
226 | .proc_handler = proc_dointvec_jiffies, |
227 | }, |
228 | { |
229 | .procname = "ip_conntrack_udp_timeout_stream", |
230 | .maxlen = sizeof(unsigned int), |
231 | .mode = 0644, |
232 | .proc_handler = proc_dointvec_jiffies, |
233 | }, |
234 | { } |
235 | }; |
236 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ |
237 | #endif /* CONFIG_SYSCTL */ |
238 | |
239 | static int udp_kmemdup_sysctl_table(struct nf_proto_net *pn, |
240 | struct nf_udp_net *un) |
241 | { |
242 | #ifdef CONFIG_SYSCTL |
243 | if (pn->ctl_table) |
244 | return 0; |
245 | pn->ctl_table = kmemdup(udp_sysctl_table, |
246 | sizeof(udp_sysctl_table), |
247 | GFP_KERNEL); |
248 | if (!pn->ctl_table) |
249 | return -ENOMEM; |
250 | pn->ctl_table[0].data = &un->timeouts[UDP_CT_UNREPLIED]; |
251 | pn->ctl_table[1].data = &un->timeouts[UDP_CT_REPLIED]; |
252 | #endif |
253 | return 0; |
254 | } |
255 | |
256 | static int udp_kmemdup_compat_sysctl_table(struct nf_proto_net *pn, |
257 | struct nf_udp_net *un) |
258 | { |
259 | #ifdef CONFIG_SYSCTL |
260 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
261 | pn->ctl_compat_table = kmemdup(udp_compat_sysctl_table, |
262 | sizeof(udp_compat_sysctl_table), |
263 | GFP_KERNEL); |
264 | if (!pn->ctl_compat_table) |
265 | return -ENOMEM; |
266 | |
267 | pn->ctl_compat_table[0].data = &un->timeouts[UDP_CT_UNREPLIED]; |
268 | pn->ctl_compat_table[1].data = &un->timeouts[UDP_CT_REPLIED]; |
269 | #endif |
270 | #endif |
271 | return 0; |
272 | } |
273 | |
274 | static int udp_init_net(struct net *net, u_int16_t proto) |
275 | { |
276 | int ret; |
277 | struct nf_udp_net *un = udp_pernet(net); |
278 | struct nf_proto_net *pn = &un->pn; |
279 | |
280 | if (!pn->users) { |
281 | int i; |
282 | |
283 | for (i = 0; i < UDP_CT_MAX; i++) |
284 | un->timeouts[i] = udp_timeouts[i]; |
285 | } |
286 | |
287 | if (proto == AF_INET) { |
288 | ret = udp_kmemdup_compat_sysctl_table(pn, un); |
289 | if (ret < 0) |
290 | return ret; |
291 | |
292 | ret = udp_kmemdup_sysctl_table(pn, un); |
293 | if (ret < 0) |
294 | nf_ct_kfree_compat_sysctl_table(pn); |
295 | } else |
296 | ret = udp_kmemdup_sysctl_table(pn, un); |
297 | |
298 | return ret; |
299 | } |
300 | |
301 | static struct nf_proto_net *udp_get_net_proto(struct net *net) |
302 | { |
303 | return &net->ct.nf_ct_proto.udp.pn; |
304 | } |
305 | |
306 | struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4 __read_mostly = |
307 | { |
308 | .l3proto = PF_INET, |
309 | .l4proto = IPPROTO_UDP, |
310 | .name = "udp", |
311 | .pkt_to_tuple = udp_pkt_to_tuple, |
312 | .invert_tuple = udp_invert_tuple, |
313 | .print_tuple = udp_print_tuple, |
314 | .packet = udp_packet, |
315 | .get_timeouts = udp_get_timeouts, |
316 | .new = udp_new, |
317 | .error = udp_error, |
318 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
319 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
320 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
321 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
322 | .nla_policy = nf_ct_port_nla_policy, |
323 | #endif |
324 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
325 | .ctnl_timeout = { |
326 | .nlattr_to_obj = udp_timeout_nlattr_to_obj, |
327 | .obj_to_nlattr = udp_timeout_obj_to_nlattr, |
328 | .nlattr_max = CTA_TIMEOUT_UDP_MAX, |
329 | .obj_size = sizeof(unsigned int) * CTA_TIMEOUT_UDP_MAX, |
330 | .nla_policy = udp_timeout_nla_policy, |
331 | }, |
332 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ |
333 | .init_net = udp_init_net, |
334 | .get_net_proto = udp_get_net_proto, |
335 | }; |
336 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp4); |
337 | |
338 | struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6 __read_mostly = |
339 | { |
340 | .l3proto = PF_INET6, |
341 | .l4proto = IPPROTO_UDP, |
342 | .name = "udp", |
343 | .pkt_to_tuple = udp_pkt_to_tuple, |
344 | .invert_tuple = udp_invert_tuple, |
345 | .print_tuple = udp_print_tuple, |
346 | .packet = udp_packet, |
347 | .get_timeouts = udp_get_timeouts, |
348 | .new = udp_new, |
349 | .error = udp_error, |
350 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
351 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
352 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
353 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
354 | .nla_policy = nf_ct_port_nla_policy, |
355 | #endif |
356 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
357 | .ctnl_timeout = { |
358 | .nlattr_to_obj = udp_timeout_nlattr_to_obj, |
359 | .obj_to_nlattr = udp_timeout_obj_to_nlattr, |
360 | .nlattr_max = CTA_TIMEOUT_UDP_MAX, |
361 | .obj_size = sizeof(unsigned int) * CTA_TIMEOUT_UDP_MAX, |
362 | .nla_policy = udp_timeout_nla_policy, |
363 | }, |
364 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ |
365 | .init_net = udp_init_net, |
366 | .get_net_proto = udp_get_net_proto, |
367 | }; |
368 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp6); |
369 |
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