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9fb9cbb1 YK |
1 | /* (C) 1999-2001 Paul `Rusty' Russell |
2 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
9fb9cbb1 YK |
7 | */ |
8 | ||
9fb9cbb1 | 9 | #include <linux/types.h> |
9fb9cbb1 | 10 | #include <linux/timer.h> |
9fb9cbb1 YK |
11 | #include <linux/module.h> |
12 | #include <linux/in.h> | |
13 | #include <linux/tcp.h> | |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/skbuff.h> | |
16 | #include <linux/ipv6.h> | |
17 | #include <net/ip6_checksum.h> | |
534f81a5 | 18 | #include <asm/unaligned.h> |
9fb9cbb1 YK |
19 | |
20 | #include <net/tcp.h> | |
21 | ||
22 | #include <linux/netfilter.h> | |
23 | #include <linux/netfilter_ipv4.h> | |
24 | #include <linux/netfilter_ipv6.h> | |
25 | #include <net/netfilter/nf_conntrack.h> | |
605dcad6 | 26 | #include <net/netfilter/nf_conntrack_l4proto.h> |
f6180121 | 27 | #include <net/netfilter/nf_conntrack_ecache.h> |
f01ffbd6 | 28 | #include <net/netfilter/nf_log.h> |
9d2493f8 CP |
29 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> |
30 | #include <net/netfilter/ipv6/nf_conntrack_ipv6.h> | |
9fb9cbb1 | 31 | |
601e68e1 YH |
32 | /* "Be conservative in what you do, |
33 | be liberal in what you accept from others." | |
9fb9cbb1 | 34 | If it's non-zero, we mark only out of window RST segments as INVALID. */ |
3aef0fd9 | 35 | static int nf_ct_tcp_be_liberal __read_mostly = 0; |
9fb9cbb1 | 36 | |
a09113c2 | 37 | /* If it is set to zero, we disable picking up already established |
9fb9cbb1 | 38 | connections. */ |
3aef0fd9 | 39 | static int nf_ct_tcp_loose __read_mostly = 1; |
9fb9cbb1 | 40 | |
601e68e1 YH |
41 | /* Max number of the retransmitted packets without receiving an (acceptable) |
42 | ACK from the destination. If this number is reached, a shorter timer | |
9fb9cbb1 | 43 | will be started. */ |
3aef0fd9 | 44 | static int nf_ct_tcp_max_retrans __read_mostly = 3; |
9fb9cbb1 YK |
45 | |
46 | /* FIXME: Examine ipfilter's timeouts and conntrack transitions more | |
47 | closely. They're more complex. --RR */ | |
48 | ||
82f568fc | 49 | static const char *const tcp_conntrack_names[] = { |
9fb9cbb1 YK |
50 | "NONE", |
51 | "SYN_SENT", | |
52 | "SYN_RECV", | |
53 | "ESTABLISHED", | |
54 | "FIN_WAIT", | |
55 | "CLOSE_WAIT", | |
56 | "LAST_ACK", | |
57 | "TIME_WAIT", | |
58 | "CLOSE", | |
874ab923 | 59 | "SYN_SENT2", |
9fb9cbb1 | 60 | }; |
601e68e1 | 61 | |
9fb9cbb1 YK |
62 | #define SECS * HZ |
63 | #define MINS * 60 SECS | |
64 | #define HOURS * 60 MINS | |
65 | #define DAYS * 24 HOURS | |
66 | ||
33ee4464 | 67 | static unsigned int tcp_timeouts[TCP_CONNTRACK_TIMEOUT_MAX] __read_mostly = { |
2d646286 PM |
68 | [TCP_CONNTRACK_SYN_SENT] = 2 MINS, |
69 | [TCP_CONNTRACK_SYN_RECV] = 60 SECS, | |
70 | [TCP_CONNTRACK_ESTABLISHED] = 5 DAYS, | |
71 | [TCP_CONNTRACK_FIN_WAIT] = 2 MINS, | |
72 | [TCP_CONNTRACK_CLOSE_WAIT] = 60 SECS, | |
73 | [TCP_CONNTRACK_LAST_ACK] = 30 SECS, | |
74 | [TCP_CONNTRACK_TIME_WAIT] = 2 MINS, | |
75 | [TCP_CONNTRACK_CLOSE] = 10 SECS, | |
874ab923 | 76 | [TCP_CONNTRACK_SYN_SENT2] = 2 MINS, |
33ee4464 PNA |
77 | /* RFC1122 says the R2 limit should be at least 100 seconds. |
78 | Linux uses 15 packets as limit, which corresponds | |
79 | to ~13-30min depending on RTO. */ | |
80 | [TCP_CONNTRACK_RETRANS] = 5 MINS, | |
81 | [TCP_CONNTRACK_UNACK] = 5 MINS, | |
2d646286 | 82 | }; |
601e68e1 | 83 | |
9fb9cbb1 YK |
84 | #define sNO TCP_CONNTRACK_NONE |
85 | #define sSS TCP_CONNTRACK_SYN_SENT | |
86 | #define sSR TCP_CONNTRACK_SYN_RECV | |
87 | #define sES TCP_CONNTRACK_ESTABLISHED | |
88 | #define sFW TCP_CONNTRACK_FIN_WAIT | |
89 | #define sCW TCP_CONNTRACK_CLOSE_WAIT | |
90 | #define sLA TCP_CONNTRACK_LAST_ACK | |
91 | #define sTW TCP_CONNTRACK_TIME_WAIT | |
92 | #define sCL TCP_CONNTRACK_CLOSE | |
874ab923 | 93 | #define sS2 TCP_CONNTRACK_SYN_SENT2 |
9fb9cbb1 YK |
94 | #define sIV TCP_CONNTRACK_MAX |
95 | #define sIG TCP_CONNTRACK_IGNORE | |
96 | ||
97 | /* What TCP flags are set from RST/SYN/FIN/ACK. */ | |
98 | enum tcp_bit_set { | |
99 | TCP_SYN_SET, | |
100 | TCP_SYNACK_SET, | |
101 | TCP_FIN_SET, | |
102 | TCP_ACK_SET, | |
103 | TCP_RST_SET, | |
104 | TCP_NONE_SET, | |
105 | }; | |
601e68e1 | 106 | |
9fb9cbb1 YK |
107 | /* |
108 | * The TCP state transition table needs a few words... | |
109 | * | |
110 | * We are the man in the middle. All the packets go through us | |
111 | * but might get lost in transit to the destination. | |
601e68e1 | 112 | * It is assumed that the destinations can't receive segments |
9fb9cbb1 YK |
113 | * we haven't seen. |
114 | * | |
115 | * The checked segment is in window, but our windows are *not* | |
116 | * equivalent with the ones of the sender/receiver. We always | |
117 | * try to guess the state of the current sender. | |
118 | * | |
119 | * The meaning of the states are: | |
120 | * | |
121 | * NONE: initial state | |
601e68e1 | 122 | * SYN_SENT: SYN-only packet seen |
874ab923 | 123 | * SYN_SENT2: SYN-only packet seen from reply dir, simultaneous open |
9fb9cbb1 YK |
124 | * SYN_RECV: SYN-ACK packet seen |
125 | * ESTABLISHED: ACK packet seen | |
126 | * FIN_WAIT: FIN packet seen | |
601e68e1 | 127 | * CLOSE_WAIT: ACK seen (after FIN) |
9fb9cbb1 YK |
128 | * LAST_ACK: FIN seen (after FIN) |
129 | * TIME_WAIT: last ACK seen | |
b2155e7f | 130 | * CLOSE: closed connection (RST) |
9fb9cbb1 | 131 | * |
9fb9cbb1 | 132 | * Packets marked as IGNORED (sIG): |
601e68e1 YH |
133 | * if they may be either invalid or valid |
134 | * and the receiver may send back a connection | |
9fb9cbb1 YK |
135 | * closing RST or a SYN/ACK. |
136 | * | |
137 | * Packets marked as INVALID (sIV): | |
874ab923 | 138 | * if we regard them as truly invalid packets |
9fb9cbb1 | 139 | */ |
a5e73c29 | 140 | static const u8 tcp_conntracks[2][6][TCP_CONNTRACK_MAX] = { |
9fb9cbb1 YK |
141 | { |
142 | /* ORIGINAL */ | |
874ab923 JK |
143 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */ |
144 | /*syn*/ { sSS, sSS, sIG, sIG, sIG, sIG, sIG, sSS, sSS, sS2 }, | |
9fb9cbb1 YK |
145 | /* |
146 | * sNO -> sSS Initialize a new connection | |
147 | * sSS -> sSS Retransmitted SYN | |
874ab923 JK |
148 | * sS2 -> sS2 Late retransmitted SYN |
149 | * sSR -> sIG | |
9fb9cbb1 | 150 | * sES -> sIG Error: SYNs in window outside the SYN_SENT state |
601e68e1 | 151 | * are errors. Receiver will reply with RST |
9fb9cbb1 YK |
152 | * and close the connection. |
153 | * Or we are not in sync and hold a dead connection. | |
154 | * sFW -> sIG | |
155 | * sCW -> sIG | |
156 | * sLA -> sIG | |
157 | * sTW -> sSS Reopened connection (RFC 1122). | |
158 | * sCL -> sSS | |
159 | */ | |
874ab923 JK |
160 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */ |
161 | /*synack*/ { sIV, sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIG, sSR }, | |
9fb9cbb1 | 162 | /* |
874ab923 JK |
163 | * sNO -> sIV Too late and no reason to do anything |
164 | * sSS -> sIV Client can't send SYN and then SYN/ACK | |
165 | * sS2 -> sSR SYN/ACK sent to SYN2 in simultaneous open | |
166 | * sSR -> sIG | |
167 | * sES -> sIG Error: SYNs in window outside the SYN_SENT state | |
168 | * are errors. Receiver will reply with RST | |
169 | * and close the connection. | |
170 | * Or we are not in sync and hold a dead connection. | |
171 | * sFW -> sIG | |
172 | * sCW -> sIG | |
173 | * sLA -> sIG | |
174 | * sTW -> sIG | |
175 | * sCL -> sIG | |
9fb9cbb1 | 176 | */ |
874ab923 | 177 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */ |
9fb9cbb1 YK |
178 | /*fin*/ { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV }, |
179 | /* | |
180 | * sNO -> sIV Too late and no reason to do anything... | |
181 | * sSS -> sIV Client migth not send FIN in this state: | |
182 | * we enforce waiting for a SYN/ACK reply first. | |
874ab923 | 183 | * sS2 -> sIV |
9fb9cbb1 YK |
184 | * sSR -> sFW Close started. |
185 | * sES -> sFW | |
186 | * sFW -> sLA FIN seen in both directions, waiting for | |
601e68e1 | 187 | * the last ACK. |
9fb9cbb1 YK |
188 | * Migth be a retransmitted FIN as well... |
189 | * sCW -> sLA | |
190 | * sLA -> sLA Retransmitted FIN. Remain in the same state. | |
191 | * sTW -> sTW | |
192 | * sCL -> sCL | |
193 | */ | |
874ab923 | 194 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */ |
9fb9cbb1 YK |
195 | /*ack*/ { sES, sIV, sES, sES, sCW, sCW, sTW, sTW, sCL, sIV }, |
196 | /* | |
197 | * sNO -> sES Assumed. | |
198 | * sSS -> sIV ACK is invalid: we haven't seen a SYN/ACK yet. | |
874ab923 | 199 | * sS2 -> sIV |
9fb9cbb1 YK |
200 | * sSR -> sES Established state is reached. |
201 | * sES -> sES :-) | |
202 | * sFW -> sCW Normal close request answered by ACK. | |
203 | * sCW -> sCW | |
204 | * sLA -> sTW Last ACK detected. | |
205 | * sTW -> sTW Retransmitted last ACK. Remain in the same state. | |
206 | * sCL -> sCL | |
207 | */ | |
874ab923 JK |
208 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */ |
209 | /*rst*/ { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL }, | |
9fb9cbb1 YK |
210 | /*none*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV } |
211 | }, | |
212 | { | |
213 | /* REPLY */ | |
874ab923 JK |
214 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */ |
215 | /*syn*/ { sIV, sS2, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sS2 }, | |
9fb9cbb1 YK |
216 | /* |
217 | * sNO -> sIV Never reached. | |
874ab923 JK |
218 | * sSS -> sS2 Simultaneous open |
219 | * sS2 -> sS2 Retransmitted simultaneous SYN | |
220 | * sSR -> sIV Invalid SYN packets sent by the server | |
221 | * sES -> sIV | |
9fb9cbb1 YK |
222 | * sFW -> sIV |
223 | * sCW -> sIV | |
224 | * sLA -> sIV | |
225 | * sTW -> sIV Reopened connection, but server may not do it. | |
226 | * sCL -> sIV | |
227 | */ | |
874ab923 | 228 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */ |
8a80c79a | 229 | /*synack*/ { sIV, sSR, sIG, sIG, sIG, sIG, sIG, sIG, sIG, sSR }, |
9fb9cbb1 YK |
230 | /* |
231 | * sSS -> sSR Standard open. | |
874ab923 | 232 | * sS2 -> sSR Simultaneous open |
8a80c79a | 233 | * sSR -> sIG Retransmitted SYN/ACK, ignore it. |
9fb9cbb1 YK |
234 | * sES -> sIG Late retransmitted SYN/ACK? |
235 | * sFW -> sIG Might be SYN/ACK answering ignored SYN | |
236 | * sCW -> sIG | |
237 | * sLA -> sIG | |
238 | * sTW -> sIG | |
239 | * sCL -> sIG | |
240 | */ | |
874ab923 | 241 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */ |
9fb9cbb1 YK |
242 | /*fin*/ { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV }, |
243 | /* | |
244 | * sSS -> sIV Server might not send FIN in this state. | |
874ab923 | 245 | * sS2 -> sIV |
9fb9cbb1 YK |
246 | * sSR -> sFW Close started. |
247 | * sES -> sFW | |
248 | * sFW -> sLA FIN seen in both directions. | |
249 | * sCW -> sLA | |
250 | * sLA -> sLA Retransmitted FIN. | |
251 | * sTW -> sTW | |
252 | * sCL -> sCL | |
253 | */ | |
874ab923 JK |
254 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */ |
255 | /*ack*/ { sIV, sIG, sSR, sES, sCW, sCW, sTW, sTW, sCL, sIG }, | |
9fb9cbb1 | 256 | /* |
73f30602 | 257 | * sSS -> sIG Might be a half-open connection. |
874ab923 | 258 | * sS2 -> sIG |
9fb9cbb1 YK |
259 | * sSR -> sSR Might answer late resent SYN. |
260 | * sES -> sES :-) | |
261 | * sFW -> sCW Normal close request answered by ACK. | |
262 | * sCW -> sCW | |
263 | * sLA -> sTW Last ACK detected. | |
264 | * sTW -> sTW Retransmitted last ACK. | |
265 | * sCL -> sCL | |
266 | */ | |
874ab923 JK |
267 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */ |
268 | /*rst*/ { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL }, | |
9fb9cbb1 | 269 | /*none*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV } |
601e68e1 | 270 | } |
9fb9cbb1 YK |
271 | }; |
272 | ||
09f263cd JE |
273 | static bool tcp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff, |
274 | struct nf_conntrack_tuple *tuple) | |
9fb9cbb1 | 275 | { |
82f568fc JE |
276 | const struct tcphdr *hp; |
277 | struct tcphdr _hdr; | |
9fb9cbb1 YK |
278 | |
279 | /* Actually only need first 8 bytes. */ | |
280 | hp = skb_header_pointer(skb, dataoff, 8, &_hdr); | |
281 | if (hp == NULL) | |
09f263cd | 282 | return false; |
9fb9cbb1 YK |
283 | |
284 | tuple->src.u.tcp.port = hp->source; | |
285 | tuple->dst.u.tcp.port = hp->dest; | |
286 | ||
09f263cd | 287 | return true; |
9fb9cbb1 YK |
288 | } |
289 | ||
09f263cd JE |
290 | static bool tcp_invert_tuple(struct nf_conntrack_tuple *tuple, |
291 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 YK |
292 | { |
293 | tuple->src.u.tcp.port = orig->dst.u.tcp.port; | |
294 | tuple->dst.u.tcp.port = orig->src.u.tcp.port; | |
09f263cd | 295 | return true; |
9fb9cbb1 YK |
296 | } |
297 | ||
298 | /* Print out the per-protocol part of the tuple. */ | |
299 | static int tcp_print_tuple(struct seq_file *s, | |
300 | const struct nf_conntrack_tuple *tuple) | |
301 | { | |
302 | return seq_printf(s, "sport=%hu dport=%hu ", | |
303 | ntohs(tuple->src.u.tcp.port), | |
304 | ntohs(tuple->dst.u.tcp.port)); | |
305 | } | |
306 | ||
307 | /* Print out the private part of the conntrack. */ | |
440f0d58 | 308 | static int tcp_print_conntrack(struct seq_file *s, struct nf_conn *ct) |
9fb9cbb1 YK |
309 | { |
310 | enum tcp_conntrack state; | |
311 | ||
440f0d58 | 312 | spin_lock_bh(&ct->lock); |
c88130bc | 313 | state = ct->proto.tcp.state; |
440f0d58 | 314 | spin_unlock_bh(&ct->lock); |
9fb9cbb1 YK |
315 | |
316 | return seq_printf(s, "%s ", tcp_conntrack_names[state]); | |
317 | } | |
318 | ||
319 | static unsigned int get_conntrack_index(const struct tcphdr *tcph) | |
320 | { | |
321 | if (tcph->rst) return TCP_RST_SET; | |
322 | else if (tcph->syn) return (tcph->ack ? TCP_SYNACK_SET : TCP_SYN_SET); | |
323 | else if (tcph->fin) return TCP_FIN_SET; | |
324 | else if (tcph->ack) return TCP_ACK_SET; | |
325 | else return TCP_NONE_SET; | |
326 | } | |
327 | ||
328 | /* TCP connection tracking based on 'Real Stateful TCP Packet Filtering | |
329 | in IP Filter' by Guido van Rooij. | |
601e68e1 | 330 | |
631dd1a8 JM |
331 | http://www.sane.nl/events/sane2000/papers.html |
332 | http://www.darkart.com/mirrors/www.obfuscation.org/ipf/ | |
601e68e1 | 333 | |
9fb9cbb1 YK |
334 | The boundaries and the conditions are changed according to RFC793: |
335 | the packet must intersect the window (i.e. segments may be | |
336 | after the right or before the left edge) and thus receivers may ACK | |
337 | segments after the right edge of the window. | |
338 | ||
601e68e1 | 339 | td_maxend = max(sack + max(win,1)) seen in reply packets |
9fb9cbb1 YK |
340 | td_maxwin = max(max(win, 1)) + (sack - ack) seen in sent packets |
341 | td_maxwin += seq + len - sender.td_maxend | |
342 | if seq + len > sender.td_maxend | |
343 | td_end = max(seq + len) seen in sent packets | |
601e68e1 | 344 | |
9fb9cbb1 YK |
345 | I. Upper bound for valid data: seq <= sender.td_maxend |
346 | II. Lower bound for valid data: seq + len >= sender.td_end - receiver.td_maxwin | |
84ebe1cd JK |
347 | III. Upper bound for valid (s)ack: sack <= receiver.td_end |
348 | IV. Lower bound for valid (s)ack: sack >= receiver.td_end - MAXACKWINDOW | |
9fb9cbb1 | 349 | |
84ebe1cd JK |
350 | where sack is the highest right edge of sack block found in the packet |
351 | or ack in the case of packet without SACK option. | |
9fb9cbb1 | 352 | |
84ebe1cd | 353 | The upper bound limit for a valid (s)ack is not ignored - |
601e68e1 | 354 | we doesn't have to deal with fragments. |
9fb9cbb1 YK |
355 | */ |
356 | ||
357 | static inline __u32 segment_seq_plus_len(__u32 seq, | |
358 | size_t len, | |
359 | unsigned int dataoff, | |
82f568fc | 360 | const struct tcphdr *tcph) |
9fb9cbb1 YK |
361 | { |
362 | /* XXX Should I use payload length field in IP/IPv6 header ? | |
363 | * - YK */ | |
364 | return (seq + len - dataoff - tcph->doff*4 | |
365 | + (tcph->syn ? 1 : 0) + (tcph->fin ? 1 : 0)); | |
366 | } | |
601e68e1 | 367 | |
9fb9cbb1 YK |
368 | /* Fixme: what about big packets? */ |
369 | #define MAXACKWINCONST 66000 | |
370 | #define MAXACKWINDOW(sender) \ | |
371 | ((sender)->td_maxwin > MAXACKWINCONST ? (sender)->td_maxwin \ | |
372 | : MAXACKWINCONST) | |
601e68e1 | 373 | |
9fb9cbb1 YK |
374 | /* |
375 | * Simplified tcp_parse_options routine from tcp_input.c | |
376 | */ | |
377 | static void tcp_options(const struct sk_buff *skb, | |
378 | unsigned int dataoff, | |
82f568fc | 379 | const struct tcphdr *tcph, |
9fb9cbb1 YK |
380 | struct ip_ct_tcp_state *state) |
381 | { | |
382 | unsigned char buff[(15 * 4) - sizeof(struct tcphdr)]; | |
82f568fc | 383 | const unsigned char *ptr; |
9fb9cbb1 YK |
384 | int length = (tcph->doff*4) - sizeof(struct tcphdr); |
385 | ||
386 | if (!length) | |
387 | return; | |
388 | ||
389 | ptr = skb_header_pointer(skb, dataoff + sizeof(struct tcphdr), | |
390 | length, buff); | |
391 | BUG_ON(ptr == NULL); | |
392 | ||
601e68e1 | 393 | state->td_scale = |
9fb9cbb1 YK |
394 | state->flags = 0; |
395 | ||
396 | while (length > 0) { | |
397 | int opcode=*ptr++; | |
398 | int opsize; | |
399 | ||
400 | switch (opcode) { | |
401 | case TCPOPT_EOL: | |
402 | return; | |
403 | case TCPOPT_NOP: /* Ref: RFC 793 section 3.1 */ | |
404 | length--; | |
405 | continue; | |
406 | default: | |
407 | opsize=*ptr++; | |
408 | if (opsize < 2) /* "silly options" */ | |
409 | return; | |
410 | if (opsize > length) | |
4a5cc84a | 411 | return; /* don't parse partial options */ |
9fb9cbb1 | 412 | |
601e68e1 | 413 | if (opcode == TCPOPT_SACK_PERM |
9fb9cbb1 YK |
414 | && opsize == TCPOLEN_SACK_PERM) |
415 | state->flags |= IP_CT_TCP_FLAG_SACK_PERM; | |
416 | else if (opcode == TCPOPT_WINDOW | |
417 | && opsize == TCPOLEN_WINDOW) { | |
418 | state->td_scale = *(u_int8_t *)ptr; | |
419 | ||
420 | if (state->td_scale > 14) { | |
421 | /* See RFC1323 */ | |
422 | state->td_scale = 14; | |
423 | } | |
424 | state->flags |= | |
425 | IP_CT_TCP_FLAG_WINDOW_SCALE; | |
426 | } | |
427 | ptr += opsize - 2; | |
428 | length -= opsize; | |
429 | } | |
430 | } | |
431 | } | |
432 | ||
433 | static void tcp_sack(const struct sk_buff *skb, unsigned int dataoff, | |
82f568fc | 434 | const struct tcphdr *tcph, __u32 *sack) |
9fb9cbb1 | 435 | { |
601e68e1 | 436 | unsigned char buff[(15 * 4) - sizeof(struct tcphdr)]; |
82f568fc | 437 | const unsigned char *ptr; |
9fb9cbb1 YK |
438 | int length = (tcph->doff*4) - sizeof(struct tcphdr); |
439 | __u32 tmp; | |
440 | ||
441 | if (!length) | |
442 | return; | |
443 | ||
444 | ptr = skb_header_pointer(skb, dataoff + sizeof(struct tcphdr), | |
445 | length, buff); | |
446 | BUG_ON(ptr == NULL); | |
447 | ||
448 | /* Fast path for timestamp-only option */ | |
bb9fc373 | 449 | if (length == TCPOLEN_TSTAMP_ALIGNED |
8f05ce91 YH |
450 | && *(__be32 *)ptr == htonl((TCPOPT_NOP << 24) |
451 | | (TCPOPT_NOP << 16) | |
452 | | (TCPOPT_TIMESTAMP << 8) | |
453 | | TCPOLEN_TIMESTAMP)) | |
9fb9cbb1 YK |
454 | return; |
455 | ||
456 | while (length > 0) { | |
457 | int opcode = *ptr++; | |
458 | int opsize, i; | |
459 | ||
460 | switch (opcode) { | |
461 | case TCPOPT_EOL: | |
462 | return; | |
463 | case TCPOPT_NOP: /* Ref: RFC 793 section 3.1 */ | |
464 | length--; | |
465 | continue; | |
466 | default: | |
467 | opsize = *ptr++; | |
468 | if (opsize < 2) /* "silly options" */ | |
469 | return; | |
470 | if (opsize > length) | |
4a5cc84a | 471 | return; /* don't parse partial options */ |
9fb9cbb1 | 472 | |
601e68e1 YH |
473 | if (opcode == TCPOPT_SACK |
474 | && opsize >= (TCPOLEN_SACK_BASE | |
475 | + TCPOLEN_SACK_PERBLOCK) | |
476 | && !((opsize - TCPOLEN_SACK_BASE) | |
477 | % TCPOLEN_SACK_PERBLOCK)) { | |
478 | for (i = 0; | |
479 | i < (opsize - TCPOLEN_SACK_BASE); | |
480 | i += TCPOLEN_SACK_PERBLOCK) { | |
534f81a5 | 481 | tmp = get_unaligned_be32((__be32 *)(ptr+i)+1); |
9fb9cbb1 YK |
482 | |
483 | if (after(tmp, *sack)) | |
484 | *sack = tmp; | |
485 | } | |
486 | return; | |
487 | } | |
488 | ptr += opsize - 2; | |
489 | length -= opsize; | |
490 | } | |
491 | } | |
492 | } | |
493 | ||
f9dd09c7 JK |
494 | #ifdef CONFIG_NF_NAT_NEEDED |
495 | static inline s16 nat_offset(const struct nf_conn *ct, | |
496 | enum ip_conntrack_dir dir, | |
497 | u32 seq) | |
498 | { | |
499 | typeof(nf_ct_nat_offset) get_offset = rcu_dereference(nf_ct_nat_offset); | |
500 | ||
501 | return get_offset != NULL ? get_offset(ct, dir, seq) : 0; | |
502 | } | |
503 | #define NAT_OFFSET(pf, ct, dir, seq) \ | |
504 | (pf == NFPROTO_IPV4 ? nat_offset(ct, dir, seq) : 0) | |
505 | #else | |
506 | #define NAT_OFFSET(pf, ct, dir, seq) 0 | |
507 | #endif | |
508 | ||
09f263cd JE |
509 | static bool tcp_in_window(const struct nf_conn *ct, |
510 | struct ip_ct_tcp *state, | |
511 | enum ip_conntrack_dir dir, | |
512 | unsigned int index, | |
513 | const struct sk_buff *skb, | |
514 | unsigned int dataoff, | |
515 | const struct tcphdr *tcph, | |
76108cea | 516 | u_int8_t pf) |
9fb9cbb1 | 517 | { |
c2a2c7e0 | 518 | struct net *net = nf_ct_net(ct); |
9fb9cbb1 YK |
519 | struct ip_ct_tcp_state *sender = &state->seen[dir]; |
520 | struct ip_ct_tcp_state *receiver = &state->seen[!dir]; | |
82f568fc | 521 | const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple; |
9fb9cbb1 | 522 | __u32 seq, ack, sack, end, win, swin; |
f9dd09c7 | 523 | s16 receiver_offset; |
09f263cd | 524 | bool res; |
9fb9cbb1 YK |
525 | |
526 | /* | |
527 | * Get the required data from the packet. | |
528 | */ | |
529 | seq = ntohl(tcph->seq); | |
530 | ack = sack = ntohl(tcph->ack_seq); | |
531 | win = ntohs(tcph->window); | |
532 | end = segment_seq_plus_len(seq, skb->len, dataoff, tcph); | |
533 | ||
534 | if (receiver->flags & IP_CT_TCP_FLAG_SACK_PERM) | |
535 | tcp_sack(skb, dataoff, tcph, &sack); | |
536 | ||
f9dd09c7 JK |
537 | /* Take into account NAT sequence number mangling */ |
538 | receiver_offset = NAT_OFFSET(pf, ct, !dir, ack - 1); | |
539 | ack -= receiver_offset; | |
540 | sack -= receiver_offset; | |
541 | ||
0d53778e PM |
542 | pr_debug("tcp_in_window: START\n"); |
543 | pr_debug("tcp_in_window: "); | |
3c9fba65 | 544 | nf_ct_dump_tuple(tuple); |
f9dd09c7 JK |
545 | pr_debug("seq=%u ack=%u+(%d) sack=%u+(%d) win=%u end=%u\n", |
546 | seq, ack, receiver_offset, sack, receiver_offset, win, end); | |
0d53778e PM |
547 | pr_debug("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i " |
548 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", | |
549 | sender->td_end, sender->td_maxend, sender->td_maxwin, | |
550 | sender->td_scale, | |
551 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, | |
552 | receiver->td_scale); | |
9fb9cbb1 | 553 | |
874ab923 | 554 | if (sender->td_maxwin == 0) { |
9fb9cbb1 YK |
555 | /* |
556 | * Initialize sender data. | |
557 | */ | |
874ab923 | 558 | if (tcph->syn) { |
9fb9cbb1 | 559 | /* |
874ab923 JK |
560 | * SYN-ACK in reply to a SYN |
561 | * or SYN from reply direction in simultaneous open. | |
9fb9cbb1 | 562 | */ |
601e68e1 | 563 | sender->td_end = |
9fb9cbb1 YK |
564 | sender->td_maxend = end; |
565 | sender->td_maxwin = (win == 0 ? 1 : win); | |
566 | ||
567 | tcp_options(skb, dataoff, tcph, sender); | |
601e68e1 | 568 | /* |
9fb9cbb1 YK |
569 | * RFC 1323: |
570 | * Both sides must send the Window Scale option | |
571 | * to enable window scaling in either direction. | |
572 | */ | |
573 | if (!(sender->flags & IP_CT_TCP_FLAG_WINDOW_SCALE | |
574 | && receiver->flags & IP_CT_TCP_FLAG_WINDOW_SCALE)) | |
601e68e1 | 575 | sender->td_scale = |
9fb9cbb1 | 576 | receiver->td_scale = 0; |
874ab923 JK |
577 | if (!tcph->ack) |
578 | /* Simultaneous open */ | |
579 | return true; | |
9fb9cbb1 YK |
580 | } else { |
581 | /* | |
582 | * We are in the middle of a connection, | |
583 | * its history is lost for us. | |
584 | * Let's try to use the data from the packet. | |
601e68e1 | 585 | */ |
9fb9cbb1 | 586 | sender->td_end = end; |
fac42a9a | 587 | win <<= sender->td_scale; |
9fb9cbb1 YK |
588 | sender->td_maxwin = (win == 0 ? 1 : win); |
589 | sender->td_maxend = end + sender->td_maxwin; | |
fac42a9a PNA |
590 | /* |
591 | * We haven't seen traffic in the other direction yet | |
592 | * but we have to tweak window tracking to pass III | |
593 | * and IV until that happens. | |
594 | */ | |
595 | if (receiver->td_maxwin == 0) | |
596 | receiver->td_end = receiver->td_maxend = sack; | |
9fb9cbb1 YK |
597 | } |
598 | } else if (((state->state == TCP_CONNTRACK_SYN_SENT | |
599 | && dir == IP_CT_DIR_ORIGINAL) | |
600 | || (state->state == TCP_CONNTRACK_SYN_RECV | |
601 | && dir == IP_CT_DIR_REPLY)) | |
602 | && after(end, sender->td_end)) { | |
603 | /* | |
604 | * RFC 793: "if a TCP is reinitialized ... then it need | |
601e68e1 | 605 | * not wait at all; it must only be sure to use sequence |
9fb9cbb1 YK |
606 | * numbers larger than those recently used." |
607 | */ | |
608 | sender->td_end = | |
609 | sender->td_maxend = end; | |
610 | sender->td_maxwin = (win == 0 ? 1 : win); | |
611 | ||
612 | tcp_options(skb, dataoff, tcph, sender); | |
613 | } | |
614 | ||
615 | if (!(tcph->ack)) { | |
616 | /* | |
617 | * If there is no ACK, just pretend it was set and OK. | |
618 | */ | |
619 | ack = sack = receiver->td_end; | |
601e68e1 YH |
620 | } else if (((tcp_flag_word(tcph) & (TCP_FLAG_ACK|TCP_FLAG_RST)) == |
621 | (TCP_FLAG_ACK|TCP_FLAG_RST)) | |
9fb9cbb1 YK |
622 | && (ack == 0)) { |
623 | /* | |
624 | * Broken TCP stacks, that set ACK in RST packets as well | |
625 | * with zero ack value. | |
626 | */ | |
627 | ack = sack = receiver->td_end; | |
628 | } | |
629 | ||
630 | if (seq == end | |
631 | && (!tcph->rst | |
632 | || (seq == 0 && state->state == TCP_CONNTRACK_SYN_SENT))) | |
633 | /* | |
634 | * Packets contains no data: we assume it is valid | |
635 | * and check the ack value only. | |
636 | * However RST segments are always validated by their | |
637 | * SEQ number, except when seq == 0 (reset sent answering | |
638 | * SYN. | |
639 | */ | |
640 | seq = end = sender->td_end; | |
641 | ||
0d53778e | 642 | pr_debug("tcp_in_window: "); |
3c9fba65 | 643 | nf_ct_dump_tuple(tuple); |
f9dd09c7 JK |
644 | pr_debug("seq=%u ack=%u+(%d) sack=%u+(%d) win=%u end=%u\n", |
645 | seq, ack, receiver_offset, sack, receiver_offset, win, end); | |
0d53778e PM |
646 | pr_debug("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i " |
647 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", | |
648 | sender->td_end, sender->td_maxend, sender->td_maxwin, | |
649 | sender->td_scale, | |
650 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, | |
651 | receiver->td_scale); | |
652 | ||
653 | pr_debug("tcp_in_window: I=%i II=%i III=%i IV=%i\n", | |
654 | before(seq, sender->td_maxend + 1), | |
655 | after(end, sender->td_end - receiver->td_maxwin - 1), | |
656 | before(sack, receiver->td_end + 1), | |
84ebe1cd | 657 | after(sack, receiver->td_end - MAXACKWINDOW(sender) - 1)); |
9fb9cbb1 | 658 | |
a09113c2 PM |
659 | if (before(seq, sender->td_maxend + 1) && |
660 | after(end, sender->td_end - receiver->td_maxwin - 1) && | |
661 | before(sack, receiver->td_end + 1) && | |
84ebe1cd | 662 | after(sack, receiver->td_end - MAXACKWINDOW(sender) - 1)) { |
601e68e1 | 663 | /* |
9fb9cbb1 YK |
664 | * Take into account window scaling (RFC 1323). |
665 | */ | |
666 | if (!tcph->syn) | |
667 | win <<= sender->td_scale; | |
668 | ||
669 | /* | |
670 | * Update sender data. | |
671 | */ | |
672 | swin = win + (sack - ack); | |
673 | if (sender->td_maxwin < swin) | |
674 | sender->td_maxwin = swin; | |
ae375044 | 675 | if (after(end, sender->td_end)) { |
9fb9cbb1 | 676 | sender->td_end = end; |
ae375044 PM |
677 | sender->flags |= IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED; |
678 | } | |
bfcaa502 JK |
679 | if (tcph->ack) { |
680 | if (!(sender->flags & IP_CT_TCP_FLAG_MAXACK_SET)) { | |
681 | sender->td_maxack = ack; | |
682 | sender->flags |= IP_CT_TCP_FLAG_MAXACK_SET; | |
683 | } else if (after(ack, sender->td_maxack)) | |
684 | sender->td_maxack = ack; | |
685 | } | |
686 | ||
9fb9cbb1 YK |
687 | /* |
688 | * Update receiver data. | |
689 | */ | |
fac42a9a | 690 | if (receiver->td_maxwin != 0 && after(end, sender->td_maxend)) |
9fb9cbb1 YK |
691 | receiver->td_maxwin += end - sender->td_maxend; |
692 | if (after(sack + win, receiver->td_maxend - 1)) { | |
693 | receiver->td_maxend = sack + win; | |
694 | if (win == 0) | |
695 | receiver->td_maxend++; | |
696 | } | |
ae375044 PM |
697 | if (ack == receiver->td_end) |
698 | receiver->flags &= ~IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED; | |
9fb9cbb1 | 699 | |
601e68e1 | 700 | /* |
9fb9cbb1 YK |
701 | * Check retransmissions. |
702 | */ | |
703 | if (index == TCP_ACK_SET) { | |
704 | if (state->last_dir == dir | |
705 | && state->last_seq == seq | |
706 | && state->last_ack == ack | |
c1fe3ca5 GH |
707 | && state->last_end == end |
708 | && state->last_win == win) | |
9fb9cbb1 YK |
709 | state->retrans++; |
710 | else { | |
711 | state->last_dir = dir; | |
712 | state->last_seq = seq; | |
713 | state->last_ack = ack; | |
714 | state->last_end = end; | |
c1fe3ca5 | 715 | state->last_win = win; |
9fb9cbb1 YK |
716 | state->retrans = 0; |
717 | } | |
718 | } | |
09f263cd | 719 | res = true; |
9fb9cbb1 | 720 | } else { |
09f263cd | 721 | res = false; |
a09113c2 PM |
722 | if (sender->flags & IP_CT_TCP_FLAG_BE_LIBERAL || |
723 | nf_ct_tcp_be_liberal) | |
09f263cd | 724 | res = true; |
c2a2c7e0 | 725 | if (!res && LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 YK |
726 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
727 | "nf_ct_tcp: %s ", | |
728 | before(seq, sender->td_maxend + 1) ? | |
729 | after(end, sender->td_end - receiver->td_maxwin - 1) ? | |
730 | before(sack, receiver->td_end + 1) ? | |
f9dd09c7 | 731 | after(sack, receiver->td_end - MAXACKWINDOW(sender) - 1) ? "BUG" |
9fb9cbb1 YK |
732 | : "ACK is under the lower bound (possible overly delayed ACK)" |
733 | : "ACK is over the upper bound (ACKed data not seen yet)" | |
734 | : "SEQ is under the lower bound (already ACKed data retransmitted)" | |
735 | : "SEQ is over the upper bound (over the window of the receiver)"); | |
601e68e1 YH |
736 | } |
737 | ||
09f263cd | 738 | pr_debug("tcp_in_window: res=%u sender end=%u maxend=%u maxwin=%u " |
0d53778e PM |
739 | "receiver end=%u maxend=%u maxwin=%u\n", |
740 | res, sender->td_end, sender->td_maxend, sender->td_maxwin, | |
741 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin); | |
9fb9cbb1 YK |
742 | |
743 | return res; | |
744 | } | |
745 | ||
5c8ce7c9 | 746 | /* table of valid flag combinations - PUSH, ECE and CWR are always valid */ |
a3433f35 CG |
747 | static const u8 tcp_valid_flags[(TCPHDR_FIN|TCPHDR_SYN|TCPHDR_RST|TCPHDR_ACK| |
748 | TCPHDR_URG) + 1] = | |
9fb9cbb1 | 749 | { |
a3433f35 CG |
750 | [TCPHDR_SYN] = 1, |
751 | [TCPHDR_SYN|TCPHDR_URG] = 1, | |
752 | [TCPHDR_SYN|TCPHDR_ACK] = 1, | |
753 | [TCPHDR_RST] = 1, | |
754 | [TCPHDR_RST|TCPHDR_ACK] = 1, | |
755 | [TCPHDR_FIN|TCPHDR_ACK] = 1, | |
756 | [TCPHDR_FIN|TCPHDR_ACK|TCPHDR_URG] = 1, | |
757 | [TCPHDR_ACK] = 1, | |
758 | [TCPHDR_ACK|TCPHDR_URG] = 1, | |
9fb9cbb1 YK |
759 | }; |
760 | ||
761 | /* Protect conntrack agaist broken packets. Code taken from ipt_unclean.c. */ | |
8fea97ec | 762 | static int tcp_error(struct net *net, struct nf_conn *tmpl, |
74c51a14 | 763 | struct sk_buff *skb, |
9fb9cbb1 YK |
764 | unsigned int dataoff, |
765 | enum ip_conntrack_info *ctinfo, | |
76108cea | 766 | u_int8_t pf, |
96f6bf82 | 767 | unsigned int hooknum) |
9fb9cbb1 | 768 | { |
82f568fc JE |
769 | const struct tcphdr *th; |
770 | struct tcphdr _tcph; | |
9fb9cbb1 YK |
771 | unsigned int tcplen = skb->len - dataoff; |
772 | u_int8_t tcpflags; | |
773 | ||
774 | /* Smaller that minimal TCP header? */ | |
775 | th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph); | |
776 | if (th == NULL) { | |
c2a2c7e0 | 777 | if (LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 YK |
778 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
779 | "nf_ct_tcp: short packet "); | |
780 | return -NF_ACCEPT; | |
601e68e1 YH |
781 | } |
782 | ||
9fb9cbb1 YK |
783 | /* Not whole TCP header or malformed packet */ |
784 | if (th->doff*4 < sizeof(struct tcphdr) || tcplen < th->doff*4) { | |
c2a2c7e0 | 785 | if (LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 YK |
786 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
787 | "nf_ct_tcp: truncated/malformed packet "); | |
788 | return -NF_ACCEPT; | |
789 | } | |
601e68e1 | 790 | |
9fb9cbb1 YK |
791 | /* Checksum invalid? Ignore. |
792 | * We skip checking packets on the outgoing path | |
84fa7933 | 793 | * because the checksum is assumed to be correct. |
9fb9cbb1 YK |
794 | */ |
795 | /* FIXME: Source route IP option packets --RR */ | |
c04d0552 | 796 | if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING && |
96f6bf82 | 797 | nf_checksum(skb, hooknum, dataoff, IPPROTO_TCP, pf)) { |
c2a2c7e0 | 798 | if (LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 YK |
799 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
800 | "nf_ct_tcp: bad TCP checksum "); | |
801 | return -NF_ACCEPT; | |
802 | } | |
803 | ||
804 | /* Check TCP flags. */ | |
a3433f35 | 805 | tcpflags = (tcp_flag_byte(th) & ~(TCPHDR_ECE|TCPHDR_CWR|TCPHDR_PSH)); |
9fb9cbb1 | 806 | if (!tcp_valid_flags[tcpflags]) { |
c2a2c7e0 | 807 | if (LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 YK |
808 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
809 | "nf_ct_tcp: invalid TCP flag combination "); | |
810 | return -NF_ACCEPT; | |
811 | } | |
812 | ||
813 | return NF_ACCEPT; | |
814 | } | |
815 | ||
2c8503f5 PNA |
816 | static unsigned int *tcp_get_timeouts(struct net *net) |
817 | { | |
818 | return tcp_timeouts; | |
819 | } | |
820 | ||
9fb9cbb1 | 821 | /* Returns verdict for packet, or -1 for invalid. */ |
c88130bc | 822 | static int tcp_packet(struct nf_conn *ct, |
9fb9cbb1 YK |
823 | const struct sk_buff *skb, |
824 | unsigned int dataoff, | |
825 | enum ip_conntrack_info ctinfo, | |
76108cea | 826 | u_int8_t pf, |
2c8503f5 PNA |
827 | unsigned int hooknum, |
828 | unsigned int *timeouts) | |
9fb9cbb1 | 829 | { |
c2a2c7e0 | 830 | struct net *net = nf_ct_net(ct); |
0d53778e | 831 | struct nf_conntrack_tuple *tuple; |
9fb9cbb1 YK |
832 | enum tcp_conntrack new_state, old_state; |
833 | enum ip_conntrack_dir dir; | |
82f568fc JE |
834 | const struct tcphdr *th; |
835 | struct tcphdr _tcph; | |
9fb9cbb1 YK |
836 | unsigned long timeout; |
837 | unsigned int index; | |
838 | ||
839 | th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph); | |
840 | BUG_ON(th == NULL); | |
841 | ||
440f0d58 | 842 | spin_lock_bh(&ct->lock); |
c88130bc | 843 | old_state = ct->proto.tcp.state; |
9fb9cbb1 YK |
844 | dir = CTINFO2DIR(ctinfo); |
845 | index = get_conntrack_index(th); | |
846 | new_state = tcp_conntracks[dir][index][old_state]; | |
c88130bc | 847 | tuple = &ct->tuplehash[dir].tuple; |
9fb9cbb1 YK |
848 | |
849 | switch (new_state) { | |
17311393 JK |
850 | case TCP_CONNTRACK_SYN_SENT: |
851 | if (old_state < TCP_CONNTRACK_TIME_WAIT) | |
852 | break; | |
b2155e7f JK |
853 | /* RFC 1122: "When a connection is closed actively, |
854 | * it MUST linger in TIME-WAIT state for a time 2xMSL | |
855 | * (Maximum Segment Lifetime). However, it MAY accept | |
856 | * a new SYN from the remote TCP to reopen the connection | |
857 | * directly from TIME-WAIT state, if..." | |
858 | * We ignore the conditions because we are in the | |
859 | * TIME-WAIT state anyway. | |
860 | * | |
861 | * Handle aborted connections: we and the server | |
862 | * think there is an existing connection but the client | |
863 | * aborts it and starts a new one. | |
864 | */ | |
865 | if (((ct->proto.tcp.seen[dir].flags | |
866 | | ct->proto.tcp.seen[!dir].flags) | |
867 | & IP_CT_TCP_FLAG_CLOSE_INIT) | |
c88130bc PM |
868 | || (ct->proto.tcp.last_dir == dir |
869 | && ct->proto.tcp.last_index == TCP_RST_SET)) { | |
bc34b841 JK |
870 | /* Attempt to reopen a closed/aborted connection. |
871 | * Delete this connection and look up again. */ | |
440f0d58 | 872 | spin_unlock_bh(&ct->lock); |
2aec609f | 873 | |
6b69fe0c PM |
874 | /* Only repeat if we can actually remove the timer. |
875 | * Destruction may already be in progress in process | |
876 | * context and we must give it a chance to terminate. | |
877 | */ | |
2aec609f | 878 | if (nf_ct_kill(ct)) |
6b69fe0c | 879 | return -NF_REPEAT; |
ec8d5409 | 880 | return NF_DROP; |
17311393 JK |
881 | } |
882 | /* Fall through */ | |
9fb9cbb1 | 883 | case TCP_CONNTRACK_IGNORE: |
73f30602 | 884 | /* Ignored packets: |
b2155e7f JK |
885 | * |
886 | * Our connection entry may be out of sync, so ignore | |
887 | * packets which may signal the real connection between | |
888 | * the client and the server. | |
73f30602 JK |
889 | * |
890 | * a) SYN in ORIGINAL | |
891 | * b) SYN/ACK in REPLY | |
601e68e1 | 892 | * c) ACK in reply direction after initial SYN in original. |
b2155e7f JK |
893 | * |
894 | * If the ignored packet is invalid, the receiver will send | |
895 | * a RST we'll catch below. | |
73f30602 | 896 | */ |
9fb9cbb1 | 897 | if (index == TCP_SYNACK_SET |
c88130bc PM |
898 | && ct->proto.tcp.last_index == TCP_SYN_SET |
899 | && ct->proto.tcp.last_dir != dir | |
900 | && ntohl(th->ack_seq) == ct->proto.tcp.last_end) { | |
b2155e7f | 901 | /* b) This SYN/ACK acknowledges a SYN that we earlier |
9fb9cbb1 YK |
902 | * ignored as invalid. This means that the client and |
903 | * the server are both in sync, while the firewall is | |
c4832c7b PNA |
904 | * not. We get in sync from the previously annotated |
905 | * values. | |
9fb9cbb1 | 906 | */ |
c4832c7b PNA |
907 | old_state = TCP_CONNTRACK_SYN_SENT; |
908 | new_state = TCP_CONNTRACK_SYN_RECV; | |
909 | ct->proto.tcp.seen[ct->proto.tcp.last_dir].td_end = | |
910 | ct->proto.tcp.last_end; | |
911 | ct->proto.tcp.seen[ct->proto.tcp.last_dir].td_maxend = | |
912 | ct->proto.tcp.last_end; | |
913 | ct->proto.tcp.seen[ct->proto.tcp.last_dir].td_maxwin = | |
914 | ct->proto.tcp.last_win == 0 ? | |
915 | 1 : ct->proto.tcp.last_win; | |
916 | ct->proto.tcp.seen[ct->proto.tcp.last_dir].td_scale = | |
917 | ct->proto.tcp.last_wscale; | |
918 | ct->proto.tcp.seen[ct->proto.tcp.last_dir].flags = | |
919 | ct->proto.tcp.last_flags; | |
920 | memset(&ct->proto.tcp.seen[dir], 0, | |
921 | sizeof(struct ip_ct_tcp_state)); | |
922 | break; | |
9fb9cbb1 | 923 | } |
c88130bc PM |
924 | ct->proto.tcp.last_index = index; |
925 | ct->proto.tcp.last_dir = dir; | |
926 | ct->proto.tcp.last_seq = ntohl(th->seq); | |
927 | ct->proto.tcp.last_end = | |
9fb9cbb1 | 928 | segment_seq_plus_len(ntohl(th->seq), skb->len, dataoff, th); |
c4832c7b PNA |
929 | ct->proto.tcp.last_win = ntohs(th->window); |
930 | ||
931 | /* a) This is a SYN in ORIGINAL. The client and the server | |
932 | * may be in sync but we are not. In that case, we annotate | |
933 | * the TCP options and let the packet go through. If it is a | |
934 | * valid SYN packet, the server will reply with a SYN/ACK, and | |
935 | * then we'll get in sync. Otherwise, the server ignores it. */ | |
936 | if (index == TCP_SYN_SET && dir == IP_CT_DIR_ORIGINAL) { | |
937 | struct ip_ct_tcp_state seen = {}; | |
938 | ||
939 | ct->proto.tcp.last_flags = | |
940 | ct->proto.tcp.last_wscale = 0; | |
941 | tcp_options(skb, dataoff, th, &seen); | |
942 | if (seen.flags & IP_CT_TCP_FLAG_WINDOW_SCALE) { | |
943 | ct->proto.tcp.last_flags |= | |
944 | IP_CT_TCP_FLAG_WINDOW_SCALE; | |
945 | ct->proto.tcp.last_wscale = seen.td_scale; | |
946 | } | |
947 | if (seen.flags & IP_CT_TCP_FLAG_SACK_PERM) { | |
948 | ct->proto.tcp.last_flags |= | |
949 | IP_CT_TCP_FLAG_SACK_PERM; | |
950 | } | |
951 | } | |
440f0d58 | 952 | spin_unlock_bh(&ct->lock); |
c2a2c7e0 | 953 | if (LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 | 954 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
b2155e7f | 955 | "nf_ct_tcp: invalid packet ignored "); |
9fb9cbb1 YK |
956 | return NF_ACCEPT; |
957 | case TCP_CONNTRACK_MAX: | |
958 | /* Invalid packet */ | |
0d53778e PM |
959 | pr_debug("nf_ct_tcp: Invalid dir=%i index=%u ostate=%u\n", |
960 | dir, get_conntrack_index(th), old_state); | |
440f0d58 | 961 | spin_unlock_bh(&ct->lock); |
c2a2c7e0 | 962 | if (LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 YK |
963 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
964 | "nf_ct_tcp: invalid state "); | |
965 | return -NF_ACCEPT; | |
9fb9cbb1 | 966 | case TCP_CONNTRACK_CLOSE: |
bfcaa502 JK |
967 | if (index == TCP_RST_SET |
968 | && (ct->proto.tcp.seen[!dir].flags & IP_CT_TCP_FLAG_MAXACK_SET) | |
969 | && before(ntohl(th->seq), ct->proto.tcp.seen[!dir].td_maxack)) { | |
970 | /* Invalid RST */ | |
334a47f6 | 971 | spin_unlock_bh(&ct->lock); |
bfcaa502 JK |
972 | if (LOG_INVALID(net, IPPROTO_TCP)) |
973 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, | |
974 | "nf_ct_tcp: invalid RST "); | |
975 | return -NF_ACCEPT; | |
976 | } | |
9fb9cbb1 | 977 | if (index == TCP_RST_SET |
c88130bc PM |
978 | && ((test_bit(IPS_SEEN_REPLY_BIT, &ct->status) |
979 | && ct->proto.tcp.last_index == TCP_SYN_SET) | |
980 | || (!test_bit(IPS_ASSURED_BIT, &ct->status) | |
981 | && ct->proto.tcp.last_index == TCP_ACK_SET)) | |
982 | && ntohl(th->ack_seq) == ct->proto.tcp.last_end) { | |
93b1fae4 | 983 | /* RST sent to invalid SYN or ACK we had let through |
73f30602 JK |
984 | * at a) and c) above: |
985 | * | |
986 | * a) SYN was in window then | |
987 | * c) we hold a half-open connection. | |
988 | * | |
989 | * Delete our connection entry. | |
9fb9cbb1 | 990 | * We skip window checking, because packet might ACK |
73f30602 | 991 | * segments we ignored. */ |
9fb9cbb1 YK |
992 | goto in_window; |
993 | } | |
93b1fae4 | 994 | /* Just fall through */ |
9fb9cbb1 YK |
995 | default: |
996 | /* Keep compilers happy. */ | |
997 | break; | |
998 | } | |
999 | ||
c88130bc | 1000 | if (!tcp_in_window(ct, &ct->proto.tcp, dir, index, |
9fb9cbb1 | 1001 | skb, dataoff, th, pf)) { |
440f0d58 | 1002 | spin_unlock_bh(&ct->lock); |
9fb9cbb1 YK |
1003 | return -NF_ACCEPT; |
1004 | } | |
1005 | in_window: | |
1006 | /* From now on we have got in-window packets */ | |
c88130bc PM |
1007 | ct->proto.tcp.last_index = index; |
1008 | ct->proto.tcp.last_dir = dir; | |
9fb9cbb1 | 1009 | |
0d53778e | 1010 | pr_debug("tcp_conntracks: "); |
3c9fba65 | 1011 | nf_ct_dump_tuple(tuple); |
0d53778e PM |
1012 | pr_debug("syn=%i ack=%i fin=%i rst=%i old=%i new=%i\n", |
1013 | (th->syn ? 1 : 0), (th->ack ? 1 : 0), | |
1014 | (th->fin ? 1 : 0), (th->rst ? 1 : 0), | |
1015 | old_state, new_state); | |
9fb9cbb1 | 1016 | |
c88130bc | 1017 | ct->proto.tcp.state = new_state; |
9fb9cbb1 | 1018 | if (old_state != new_state |
d0c1fd7a | 1019 | && new_state == TCP_CONNTRACK_FIN_WAIT) |
c88130bc | 1020 | ct->proto.tcp.seen[dir].flags |= IP_CT_TCP_FLAG_CLOSE_INIT; |
ae375044 PM |
1021 | |
1022 | if (ct->proto.tcp.retrans >= nf_ct_tcp_max_retrans && | |
2c8503f5 PNA |
1023 | timeouts[new_state] > timeouts[TCP_CONNTRACK_RETRANS]) |
1024 | timeout = timeouts[TCP_CONNTRACK_RETRANS]; | |
ae375044 PM |
1025 | else if ((ct->proto.tcp.seen[0].flags | ct->proto.tcp.seen[1].flags) & |
1026 | IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED && | |
2c8503f5 PNA |
1027 | timeouts[new_state] > timeouts[TCP_CONNTRACK_UNACK]) |
1028 | timeout = timeouts[TCP_CONNTRACK_UNACK]; | |
ae375044 | 1029 | else |
2c8503f5 | 1030 | timeout = timeouts[new_state]; |
440f0d58 | 1031 | spin_unlock_bh(&ct->lock); |
9fb9cbb1 | 1032 | |
9fb9cbb1 | 1033 | if (new_state != old_state) |
a71996fc | 1034 | nf_conntrack_event_cache(IPCT_PROTOINFO, ct); |
9fb9cbb1 | 1035 | |
c88130bc | 1036 | if (!test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { |
9fb9cbb1 YK |
1037 | /* If only reply is a RST, we can consider ourselves not to |
1038 | have an established connection: this is a fairly common | |
1039 | problem case, so we can delete the conntrack | |
1040 | immediately. --RR */ | |
1041 | if (th->rst) { | |
718d4ad9 | 1042 | nf_ct_kill_acct(ct, ctinfo, skb); |
9fb9cbb1 YK |
1043 | return NF_ACCEPT; |
1044 | } | |
c88130bc | 1045 | } else if (!test_bit(IPS_ASSURED_BIT, &ct->status) |
9fb9cbb1 YK |
1046 | && (old_state == TCP_CONNTRACK_SYN_RECV |
1047 | || old_state == TCP_CONNTRACK_ESTABLISHED) | |
1048 | && new_state == TCP_CONNTRACK_ESTABLISHED) { | |
601e68e1 YH |
1049 | /* Set ASSURED if we see see valid ack in ESTABLISHED |
1050 | after SYN_RECV or a valid answer for a picked up | |
9fb9cbb1 | 1051 | connection. */ |
c88130bc | 1052 | set_bit(IPS_ASSURED_BIT, &ct->status); |
858b3133 | 1053 | nf_conntrack_event_cache(IPCT_ASSURED, ct); |
9fb9cbb1 | 1054 | } |
c88130bc | 1055 | nf_ct_refresh_acct(ct, ctinfo, skb, timeout); |
9fb9cbb1 YK |
1056 | |
1057 | return NF_ACCEPT; | |
1058 | } | |
601e68e1 | 1059 | |
9fb9cbb1 | 1060 | /* Called when a new connection for this protocol found. */ |
09f263cd | 1061 | static bool tcp_new(struct nf_conn *ct, const struct sk_buff *skb, |
2c8503f5 | 1062 | unsigned int dataoff, unsigned int *timeouts) |
9fb9cbb1 YK |
1063 | { |
1064 | enum tcp_conntrack new_state; | |
82f568fc JE |
1065 | const struct tcphdr *th; |
1066 | struct tcphdr _tcph; | |
1067 | const struct ip_ct_tcp_state *sender = &ct->proto.tcp.seen[0]; | |
1068 | const struct ip_ct_tcp_state *receiver = &ct->proto.tcp.seen[1]; | |
9fb9cbb1 YK |
1069 | |
1070 | th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph); | |
1071 | BUG_ON(th == NULL); | |
1072 | ||
1073 | /* Don't need lock here: this conntrack not in circulation yet */ | |
e5fc9e7a | 1074 | new_state = tcp_conntracks[0][get_conntrack_index(th)][TCP_CONNTRACK_NONE]; |
9fb9cbb1 YK |
1075 | |
1076 | /* Invalid: delete conntrack */ | |
1077 | if (new_state >= TCP_CONNTRACK_MAX) { | |
0d53778e | 1078 | pr_debug("nf_ct_tcp: invalid new deleting.\n"); |
09f263cd | 1079 | return false; |
9fb9cbb1 YK |
1080 | } |
1081 | ||
1082 | if (new_state == TCP_CONNTRACK_SYN_SENT) { | |
e5fc9e7a | 1083 | memset(&ct->proto.tcp, 0, sizeof(ct->proto.tcp)); |
9fb9cbb1 | 1084 | /* SYN packet */ |
c88130bc | 1085 | ct->proto.tcp.seen[0].td_end = |
9fb9cbb1 YK |
1086 | segment_seq_plus_len(ntohl(th->seq), skb->len, |
1087 | dataoff, th); | |
c88130bc PM |
1088 | ct->proto.tcp.seen[0].td_maxwin = ntohs(th->window); |
1089 | if (ct->proto.tcp.seen[0].td_maxwin == 0) | |
1090 | ct->proto.tcp.seen[0].td_maxwin = 1; | |
1091 | ct->proto.tcp.seen[0].td_maxend = | |
1092 | ct->proto.tcp.seen[0].td_end; | |
1093 | ||
1094 | tcp_options(skb, dataoff, th, &ct->proto.tcp.seen[0]); | |
9fb9cbb1 YK |
1095 | } else if (nf_ct_tcp_loose == 0) { |
1096 | /* Don't try to pick up connections. */ | |
09f263cd | 1097 | return false; |
9fb9cbb1 | 1098 | } else { |
e5fc9e7a | 1099 | memset(&ct->proto.tcp, 0, sizeof(ct->proto.tcp)); |
9fb9cbb1 YK |
1100 | /* |
1101 | * We are in the middle of a connection, | |
1102 | * its history is lost for us. | |
1103 | * Let's try to use the data from the packet. | |
1104 | */ | |
c88130bc | 1105 | ct->proto.tcp.seen[0].td_end = |
9fb9cbb1 YK |
1106 | segment_seq_plus_len(ntohl(th->seq), skb->len, |
1107 | dataoff, th); | |
c88130bc PM |
1108 | ct->proto.tcp.seen[0].td_maxwin = ntohs(th->window); |
1109 | if (ct->proto.tcp.seen[0].td_maxwin == 0) | |
1110 | ct->proto.tcp.seen[0].td_maxwin = 1; | |
1111 | ct->proto.tcp.seen[0].td_maxend = | |
1112 | ct->proto.tcp.seen[0].td_end + | |
1113 | ct->proto.tcp.seen[0].td_maxwin; | |
9fb9cbb1 | 1114 | |
a09113c2 PM |
1115 | /* We assume SACK and liberal window checking to handle |
1116 | * window scaling */ | |
c88130bc PM |
1117 | ct->proto.tcp.seen[0].flags = |
1118 | ct->proto.tcp.seen[1].flags = IP_CT_TCP_FLAG_SACK_PERM | | |
1119 | IP_CT_TCP_FLAG_BE_LIBERAL; | |
9fb9cbb1 | 1120 | } |
601e68e1 | 1121 | |
9fb9cbb1 | 1122 | /* tcp_packet will set them */ |
c88130bc | 1123 | ct->proto.tcp.last_index = TCP_NONE_SET; |
601e68e1 | 1124 | |
0d53778e PM |
1125 | pr_debug("tcp_new: sender end=%u maxend=%u maxwin=%u scale=%i " |
1126 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", | |
1127 | sender->td_end, sender->td_maxend, sender->td_maxwin, | |
1128 | sender->td_scale, | |
1129 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, | |
1130 | receiver->td_scale); | |
09f263cd | 1131 | return true; |
9fb9cbb1 | 1132 | } |
c1d10adb | 1133 | |
c0cd1156 | 1134 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
c1d10adb PNA |
1135 | |
1136 | #include <linux/netfilter/nfnetlink.h> | |
1137 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
1138 | ||
fdf70832 | 1139 | static int tcp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, |
440f0d58 | 1140 | struct nf_conn *ct) |
c1d10adb | 1141 | { |
df6fb868 | 1142 | struct nlattr *nest_parms; |
c8e2078c | 1143 | struct nf_ct_tcp_flags tmp = {}; |
601e68e1 | 1144 | |
440f0d58 | 1145 | spin_lock_bh(&ct->lock); |
df6fb868 PM |
1146 | nest_parms = nla_nest_start(skb, CTA_PROTOINFO_TCP | NLA_F_NESTED); |
1147 | if (!nest_parms) | |
1148 | goto nla_put_failure; | |
1149 | ||
77236b6e | 1150 | NLA_PUT_U8(skb, CTA_PROTOINFO_TCP_STATE, ct->proto.tcp.state); |
c8e2078c | 1151 | |
77236b6e PM |
1152 | NLA_PUT_U8(skb, CTA_PROTOINFO_TCP_WSCALE_ORIGINAL, |
1153 | ct->proto.tcp.seen[0].td_scale); | |
c8e2078c | 1154 | |
77236b6e PM |
1155 | NLA_PUT_U8(skb, CTA_PROTOINFO_TCP_WSCALE_REPLY, |
1156 | ct->proto.tcp.seen[1].td_scale); | |
c8e2078c PNA |
1157 | |
1158 | tmp.flags = ct->proto.tcp.seen[0].flags; | |
df6fb868 | 1159 | NLA_PUT(skb, CTA_PROTOINFO_TCP_FLAGS_ORIGINAL, |
c8e2078c PNA |
1160 | sizeof(struct nf_ct_tcp_flags), &tmp); |
1161 | ||
1162 | tmp.flags = ct->proto.tcp.seen[1].flags; | |
df6fb868 | 1163 | NLA_PUT(skb, CTA_PROTOINFO_TCP_FLAGS_REPLY, |
c8e2078c | 1164 | sizeof(struct nf_ct_tcp_flags), &tmp); |
440f0d58 | 1165 | spin_unlock_bh(&ct->lock); |
c1d10adb | 1166 | |
df6fb868 | 1167 | nla_nest_end(skb, nest_parms); |
c1d10adb PNA |
1168 | |
1169 | return 0; | |
1170 | ||
df6fb868 | 1171 | nla_put_failure: |
440f0d58 | 1172 | spin_unlock_bh(&ct->lock); |
c1d10adb PNA |
1173 | return -1; |
1174 | } | |
1175 | ||
f73e924c PM |
1176 | static const struct nla_policy tcp_nla_policy[CTA_PROTOINFO_TCP_MAX+1] = { |
1177 | [CTA_PROTOINFO_TCP_STATE] = { .type = NLA_U8 }, | |
1178 | [CTA_PROTOINFO_TCP_WSCALE_ORIGINAL] = { .type = NLA_U8 }, | |
1179 | [CTA_PROTOINFO_TCP_WSCALE_REPLY] = { .type = NLA_U8 }, | |
1180 | [CTA_PROTOINFO_TCP_FLAGS_ORIGINAL] = { .len = sizeof(struct nf_ct_tcp_flags) }, | |
1181 | [CTA_PROTOINFO_TCP_FLAGS_REPLY] = { .len = sizeof(struct nf_ct_tcp_flags) }, | |
c1d10adb PNA |
1182 | }; |
1183 | ||
fdf70832 | 1184 | static int nlattr_to_tcp(struct nlattr *cda[], struct nf_conn *ct) |
c1d10adb | 1185 | { |
2f0d2f10 | 1186 | struct nlattr *pattr = cda[CTA_PROTOINFO_TCP]; |
df6fb868 | 1187 | struct nlattr *tb[CTA_PROTOINFO_TCP_MAX+1]; |
f73e924c | 1188 | int err; |
c1d10adb PNA |
1189 | |
1190 | /* updates could not contain anything about the private | |
1191 | * protocol info, in that case skip the parsing */ | |
2f0d2f10 | 1192 | if (!pattr) |
c1d10adb PNA |
1193 | return 0; |
1194 | ||
2f0d2f10 | 1195 | err = nla_parse_nested(tb, CTA_PROTOINFO_TCP_MAX, pattr, tcp_nla_policy); |
f73e924c PM |
1196 | if (err < 0) |
1197 | return err; | |
c1d10adb | 1198 | |
5f7da4d2 PM |
1199 | if (tb[CTA_PROTOINFO_TCP_STATE] && |
1200 | nla_get_u8(tb[CTA_PROTOINFO_TCP_STATE]) >= TCP_CONNTRACK_MAX) | |
c1d10adb PNA |
1201 | return -EINVAL; |
1202 | ||
440f0d58 | 1203 | spin_lock_bh(&ct->lock); |
5f7da4d2 PM |
1204 | if (tb[CTA_PROTOINFO_TCP_STATE]) |
1205 | ct->proto.tcp.state = nla_get_u8(tb[CTA_PROTOINFO_TCP_STATE]); | |
c8e2078c | 1206 | |
df6fb868 | 1207 | if (tb[CTA_PROTOINFO_TCP_FLAGS_ORIGINAL]) { |
c8e2078c | 1208 | struct nf_ct_tcp_flags *attr = |
df6fb868 | 1209 | nla_data(tb[CTA_PROTOINFO_TCP_FLAGS_ORIGINAL]); |
c8e2078c PNA |
1210 | ct->proto.tcp.seen[0].flags &= ~attr->mask; |
1211 | ct->proto.tcp.seen[0].flags |= attr->flags & attr->mask; | |
1212 | } | |
1213 | ||
df6fb868 | 1214 | if (tb[CTA_PROTOINFO_TCP_FLAGS_REPLY]) { |
c8e2078c | 1215 | struct nf_ct_tcp_flags *attr = |
df6fb868 | 1216 | nla_data(tb[CTA_PROTOINFO_TCP_FLAGS_REPLY]); |
c8e2078c PNA |
1217 | ct->proto.tcp.seen[1].flags &= ~attr->mask; |
1218 | ct->proto.tcp.seen[1].flags |= attr->flags & attr->mask; | |
1219 | } | |
1220 | ||
df6fb868 PM |
1221 | if (tb[CTA_PROTOINFO_TCP_WSCALE_ORIGINAL] && |
1222 | tb[CTA_PROTOINFO_TCP_WSCALE_REPLY] && | |
c8e2078c PNA |
1223 | ct->proto.tcp.seen[0].flags & IP_CT_TCP_FLAG_WINDOW_SCALE && |
1224 | ct->proto.tcp.seen[1].flags & IP_CT_TCP_FLAG_WINDOW_SCALE) { | |
77236b6e PM |
1225 | ct->proto.tcp.seen[0].td_scale = |
1226 | nla_get_u8(tb[CTA_PROTOINFO_TCP_WSCALE_ORIGINAL]); | |
1227 | ct->proto.tcp.seen[1].td_scale = | |
1228 | nla_get_u8(tb[CTA_PROTOINFO_TCP_WSCALE_REPLY]); | |
c8e2078c | 1229 | } |
440f0d58 | 1230 | spin_unlock_bh(&ct->lock); |
c1d10adb PNA |
1231 | |
1232 | return 0; | |
1233 | } | |
a400c30e HE |
1234 | |
1235 | static int tcp_nlattr_size(void) | |
1236 | { | |
1237 | return nla_total_size(0) /* CTA_PROTOINFO_TCP */ | |
1238 | + nla_policy_len(tcp_nla_policy, CTA_PROTOINFO_TCP_MAX + 1); | |
1239 | } | |
1240 | ||
1241 | static int tcp_nlattr_tuple_size(void) | |
1242 | { | |
1243 | return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1); | |
1244 | } | |
c1d10adb | 1245 | #endif |
933a41e7 | 1246 | |
50978462 PNA |
1247 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
1248 | ||
1249 | #include <linux/netfilter/nfnetlink.h> | |
1250 | #include <linux/netfilter/nfnetlink_cttimeout.h> | |
1251 | ||
1252 | static int tcp_timeout_nlattr_to_obj(struct nlattr *tb[], void *data) | |
1253 | { | |
1254 | unsigned int *timeouts = data; | |
1255 | int i; | |
1256 | ||
1257 | /* set default TCP timeouts. */ | |
1258 | for (i=0; i<TCP_CONNTRACK_TIMEOUT_MAX; i++) | |
1259 | timeouts[i] = tcp_timeouts[i]; | |
1260 | ||
1261 | if (tb[CTA_TIMEOUT_TCP_SYN_SENT]) { | |
1262 | timeouts[TCP_CONNTRACK_SYN_SENT] = | |
1263 | ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_SYN_SENT]))*HZ; | |
1264 | } | |
1265 | if (tb[CTA_TIMEOUT_TCP_SYN_RECV]) { | |
1266 | timeouts[TCP_CONNTRACK_SYN_RECV] = | |
1267 | ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_SYN_RECV]))*HZ; | |
1268 | } | |
1269 | if (tb[CTA_TIMEOUT_TCP_ESTABLISHED]) { | |
1270 | timeouts[TCP_CONNTRACK_ESTABLISHED] = | |
1271 | ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_ESTABLISHED]))*HZ; | |
1272 | } | |
1273 | if (tb[CTA_TIMEOUT_TCP_FIN_WAIT]) { | |
1274 | timeouts[TCP_CONNTRACK_FIN_WAIT] = | |
1275 | ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_FIN_WAIT]))*HZ; | |
1276 | } | |
1277 | if (tb[CTA_TIMEOUT_TCP_CLOSE_WAIT]) { | |
1278 | timeouts[TCP_CONNTRACK_CLOSE_WAIT] = | |
1279 | ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_CLOSE_WAIT]))*HZ; | |
1280 | } | |
1281 | if (tb[CTA_TIMEOUT_TCP_LAST_ACK]) { | |
1282 | timeouts[TCP_CONNTRACK_LAST_ACK] = | |
1283 | ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_LAST_ACK]))*HZ; | |
1284 | } | |
1285 | if (tb[CTA_TIMEOUT_TCP_TIME_WAIT]) { | |
1286 | timeouts[TCP_CONNTRACK_TIME_WAIT] = | |
1287 | ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_TIME_WAIT]))*HZ; | |
1288 | } | |
1289 | if (tb[CTA_TIMEOUT_TCP_CLOSE]) { | |
1290 | timeouts[TCP_CONNTRACK_CLOSE] = | |
1291 | ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_CLOSE]))*HZ; | |
1292 | } | |
1293 | if (tb[CTA_TIMEOUT_TCP_SYN_SENT2]) { | |
1294 | timeouts[TCP_CONNTRACK_SYN_SENT2] = | |
1295 | ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_SYN_SENT2]))*HZ; | |
1296 | } | |
1297 | if (tb[CTA_TIMEOUT_TCP_RETRANS]) { | |
1298 | timeouts[TCP_CONNTRACK_RETRANS] = | |
1299 | ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_RETRANS]))*HZ; | |
1300 | } | |
1301 | if (tb[CTA_TIMEOUT_TCP_UNACK]) { | |
1302 | timeouts[TCP_CONNTRACK_UNACK] = | |
1303 | ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_UNACK]))*HZ; | |
1304 | } | |
1305 | return 0; | |
1306 | } | |
1307 | ||
1308 | static int | |
1309 | tcp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) | |
1310 | { | |
1311 | const unsigned int *timeouts = data; | |
1312 | ||
1313 | NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_SYN_SENT, | |
1314 | htonl(timeouts[TCP_CONNTRACK_SYN_SENT] / HZ)); | |
1315 | NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_SYN_RECV, | |
1316 | htonl(timeouts[TCP_CONNTRACK_SYN_RECV] / HZ)); | |
1317 | NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_ESTABLISHED, | |
1318 | htonl(timeouts[TCP_CONNTRACK_ESTABLISHED] / HZ)); | |
1319 | NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_FIN_WAIT, | |
1320 | htonl(timeouts[TCP_CONNTRACK_FIN_WAIT] / HZ)); | |
1321 | NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_CLOSE_WAIT, | |
1322 | htonl(timeouts[TCP_CONNTRACK_CLOSE_WAIT] / HZ)); | |
1323 | NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_LAST_ACK, | |
1324 | htonl(timeouts[TCP_CONNTRACK_LAST_ACK] / HZ)); | |
1325 | NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_TIME_WAIT, | |
1326 | htonl(timeouts[TCP_CONNTRACK_TIME_WAIT] / HZ)); | |
1327 | NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_CLOSE, | |
1328 | htonl(timeouts[TCP_CONNTRACK_CLOSE] / HZ)); | |
1329 | NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_SYN_SENT2, | |
1330 | htonl(timeouts[TCP_CONNTRACK_SYN_SENT2] / HZ)); | |
1331 | NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_RETRANS, | |
1332 | htonl(timeouts[TCP_CONNTRACK_RETRANS] / HZ)); | |
1333 | NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_UNACK, | |
1334 | htonl(timeouts[TCP_CONNTRACK_UNACK] / HZ)); | |
1335 | return 0; | |
1336 | ||
1337 | nla_put_failure: | |
1338 | return -ENOSPC; | |
1339 | } | |
1340 | ||
1341 | static const struct nla_policy tcp_timeout_nla_policy[CTA_TIMEOUT_TCP_MAX+1] = { | |
1342 | [CTA_TIMEOUT_TCP_SYN_SENT] = { .type = NLA_U32 }, | |
1343 | [CTA_TIMEOUT_TCP_SYN_RECV] = { .type = NLA_U32 }, | |
1344 | [CTA_TIMEOUT_TCP_ESTABLISHED] = { .type = NLA_U32 }, | |
1345 | [CTA_TIMEOUT_TCP_FIN_WAIT] = { .type = NLA_U32 }, | |
1346 | [CTA_TIMEOUT_TCP_CLOSE_WAIT] = { .type = NLA_U32 }, | |
1347 | [CTA_TIMEOUT_TCP_LAST_ACK] = { .type = NLA_U32 }, | |
1348 | [CTA_TIMEOUT_TCP_TIME_WAIT] = { .type = NLA_U32 }, | |
1349 | [CTA_TIMEOUT_TCP_CLOSE] = { .type = NLA_U32 }, | |
1350 | [CTA_TIMEOUT_TCP_SYN_SENT2] = { .type = NLA_U32 }, | |
1351 | }; | |
1352 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ | |
1353 | ||
933a41e7 PM |
1354 | #ifdef CONFIG_SYSCTL |
1355 | static unsigned int tcp_sysctl_table_users; | |
1356 | static struct ctl_table_header *tcp_sysctl_header; | |
1357 | static struct ctl_table tcp_sysctl_table[] = { | |
1358 | { | |
933a41e7 | 1359 | .procname = "nf_conntrack_tcp_timeout_syn_sent", |
2d646286 | 1360 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_SENT], |
933a41e7 PM |
1361 | .maxlen = sizeof(unsigned int), |
1362 | .mode = 0644, | |
6d9f239a | 1363 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1364 | }, |
1365 | { | |
933a41e7 | 1366 | .procname = "nf_conntrack_tcp_timeout_syn_recv", |
2d646286 | 1367 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_RECV], |
933a41e7 PM |
1368 | .maxlen = sizeof(unsigned int), |
1369 | .mode = 0644, | |
6d9f239a | 1370 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1371 | }, |
1372 | { | |
933a41e7 | 1373 | .procname = "nf_conntrack_tcp_timeout_established", |
2d646286 | 1374 | .data = &tcp_timeouts[TCP_CONNTRACK_ESTABLISHED], |
933a41e7 PM |
1375 | .maxlen = sizeof(unsigned int), |
1376 | .mode = 0644, | |
6d9f239a | 1377 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1378 | }, |
1379 | { | |
933a41e7 | 1380 | .procname = "nf_conntrack_tcp_timeout_fin_wait", |
2d646286 | 1381 | .data = &tcp_timeouts[TCP_CONNTRACK_FIN_WAIT], |
933a41e7 PM |
1382 | .maxlen = sizeof(unsigned int), |
1383 | .mode = 0644, | |
6d9f239a | 1384 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1385 | }, |
1386 | { | |
933a41e7 | 1387 | .procname = "nf_conntrack_tcp_timeout_close_wait", |
2d646286 | 1388 | .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE_WAIT], |
933a41e7 PM |
1389 | .maxlen = sizeof(unsigned int), |
1390 | .mode = 0644, | |
6d9f239a | 1391 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1392 | }, |
1393 | { | |
933a41e7 | 1394 | .procname = "nf_conntrack_tcp_timeout_last_ack", |
2d646286 | 1395 | .data = &tcp_timeouts[TCP_CONNTRACK_LAST_ACK], |
933a41e7 PM |
1396 | .maxlen = sizeof(unsigned int), |
1397 | .mode = 0644, | |
6d9f239a | 1398 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1399 | }, |
1400 | { | |
933a41e7 | 1401 | .procname = "nf_conntrack_tcp_timeout_time_wait", |
2d646286 | 1402 | .data = &tcp_timeouts[TCP_CONNTRACK_TIME_WAIT], |
933a41e7 PM |
1403 | .maxlen = sizeof(unsigned int), |
1404 | .mode = 0644, | |
6d9f239a | 1405 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1406 | }, |
1407 | { | |
933a41e7 | 1408 | .procname = "nf_conntrack_tcp_timeout_close", |
2d646286 | 1409 | .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE], |
933a41e7 PM |
1410 | .maxlen = sizeof(unsigned int), |
1411 | .mode = 0644, | |
6d9f239a | 1412 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1413 | }, |
1414 | { | |
933a41e7 | 1415 | .procname = "nf_conntrack_tcp_timeout_max_retrans", |
33ee4464 | 1416 | .data = &tcp_timeouts[TCP_CONNTRACK_RETRANS], |
933a41e7 PM |
1417 | .maxlen = sizeof(unsigned int), |
1418 | .mode = 0644, | |
6d9f239a | 1419 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 | 1420 | }, |
ae375044 PM |
1421 | { |
1422 | .procname = "nf_conntrack_tcp_timeout_unacknowledged", | |
33ee4464 | 1423 | .data = &tcp_timeouts[TCP_CONNTRACK_UNACK], |
ae375044 PM |
1424 | .maxlen = sizeof(unsigned int), |
1425 | .mode = 0644, | |
6d9f239a | 1426 | .proc_handler = proc_dointvec_jiffies, |
ae375044 | 1427 | }, |
933a41e7 | 1428 | { |
933a41e7 PM |
1429 | .procname = "nf_conntrack_tcp_loose", |
1430 | .data = &nf_ct_tcp_loose, | |
1431 | .maxlen = sizeof(unsigned int), | |
1432 | .mode = 0644, | |
6d9f239a | 1433 | .proc_handler = proc_dointvec, |
933a41e7 PM |
1434 | }, |
1435 | { | |
933a41e7 PM |
1436 | .procname = "nf_conntrack_tcp_be_liberal", |
1437 | .data = &nf_ct_tcp_be_liberal, | |
1438 | .maxlen = sizeof(unsigned int), | |
1439 | .mode = 0644, | |
6d9f239a | 1440 | .proc_handler = proc_dointvec, |
933a41e7 PM |
1441 | }, |
1442 | { | |
933a41e7 PM |
1443 | .procname = "nf_conntrack_tcp_max_retrans", |
1444 | .data = &nf_ct_tcp_max_retrans, | |
1445 | .maxlen = sizeof(unsigned int), | |
1446 | .mode = 0644, | |
6d9f239a | 1447 | .proc_handler = proc_dointvec, |
933a41e7 | 1448 | }, |
f8572d8f | 1449 | { } |
933a41e7 | 1450 | }; |
a999e683 PM |
1451 | |
1452 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT | |
1453 | static struct ctl_table tcp_compat_sysctl_table[] = { | |
1454 | { | |
a999e683 | 1455 | .procname = "ip_conntrack_tcp_timeout_syn_sent", |
2d646286 | 1456 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_SENT], |
a999e683 PM |
1457 | .maxlen = sizeof(unsigned int), |
1458 | .mode = 0644, | |
6d9f239a | 1459 | .proc_handler = proc_dointvec_jiffies, |
a999e683 | 1460 | }, |
874ab923 JK |
1461 | { |
1462 | .procname = "ip_conntrack_tcp_timeout_syn_sent2", | |
1463 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_SENT2], | |
1464 | .maxlen = sizeof(unsigned int), | |
1465 | .mode = 0644, | |
1466 | .proc_handler = proc_dointvec_jiffies, | |
1467 | }, | |
a999e683 | 1468 | { |
a999e683 | 1469 | .procname = "ip_conntrack_tcp_timeout_syn_recv", |
2d646286 | 1470 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_RECV], |
a999e683 PM |
1471 | .maxlen = sizeof(unsigned int), |
1472 | .mode = 0644, | |
6d9f239a | 1473 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1474 | }, |
1475 | { | |
a999e683 | 1476 | .procname = "ip_conntrack_tcp_timeout_established", |
2d646286 | 1477 | .data = &tcp_timeouts[TCP_CONNTRACK_ESTABLISHED], |
a999e683 PM |
1478 | .maxlen = sizeof(unsigned int), |
1479 | .mode = 0644, | |
6d9f239a | 1480 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1481 | }, |
1482 | { | |
a999e683 | 1483 | .procname = "ip_conntrack_tcp_timeout_fin_wait", |
2d646286 | 1484 | .data = &tcp_timeouts[TCP_CONNTRACK_FIN_WAIT], |
a999e683 PM |
1485 | .maxlen = sizeof(unsigned int), |
1486 | .mode = 0644, | |
6d9f239a | 1487 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1488 | }, |
1489 | { | |
a999e683 | 1490 | .procname = "ip_conntrack_tcp_timeout_close_wait", |
2d646286 | 1491 | .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE_WAIT], |
a999e683 PM |
1492 | .maxlen = sizeof(unsigned int), |
1493 | .mode = 0644, | |
6d9f239a | 1494 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1495 | }, |
1496 | { | |
a999e683 | 1497 | .procname = "ip_conntrack_tcp_timeout_last_ack", |
2d646286 | 1498 | .data = &tcp_timeouts[TCP_CONNTRACK_LAST_ACK], |
a999e683 PM |
1499 | .maxlen = sizeof(unsigned int), |
1500 | .mode = 0644, | |
6d9f239a | 1501 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1502 | }, |
1503 | { | |
a999e683 | 1504 | .procname = "ip_conntrack_tcp_timeout_time_wait", |
2d646286 | 1505 | .data = &tcp_timeouts[TCP_CONNTRACK_TIME_WAIT], |
a999e683 PM |
1506 | .maxlen = sizeof(unsigned int), |
1507 | .mode = 0644, | |
6d9f239a | 1508 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1509 | }, |
1510 | { | |
a999e683 | 1511 | .procname = "ip_conntrack_tcp_timeout_close", |
2d646286 | 1512 | .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE], |
a999e683 PM |
1513 | .maxlen = sizeof(unsigned int), |
1514 | .mode = 0644, | |
6d9f239a | 1515 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1516 | }, |
1517 | { | |
a999e683 | 1518 | .procname = "ip_conntrack_tcp_timeout_max_retrans", |
33ee4464 | 1519 | .data = &tcp_timeouts[TCP_CONNTRACK_RETRANS], |
a999e683 PM |
1520 | .maxlen = sizeof(unsigned int), |
1521 | .mode = 0644, | |
6d9f239a | 1522 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1523 | }, |
1524 | { | |
a999e683 PM |
1525 | .procname = "ip_conntrack_tcp_loose", |
1526 | .data = &nf_ct_tcp_loose, | |
1527 | .maxlen = sizeof(unsigned int), | |
1528 | .mode = 0644, | |
6d9f239a | 1529 | .proc_handler = proc_dointvec, |
a999e683 PM |
1530 | }, |
1531 | { | |
a999e683 PM |
1532 | .procname = "ip_conntrack_tcp_be_liberal", |
1533 | .data = &nf_ct_tcp_be_liberal, | |
1534 | .maxlen = sizeof(unsigned int), | |
1535 | .mode = 0644, | |
6d9f239a | 1536 | .proc_handler = proc_dointvec, |
a999e683 PM |
1537 | }, |
1538 | { | |
a999e683 PM |
1539 | .procname = "ip_conntrack_tcp_max_retrans", |
1540 | .data = &nf_ct_tcp_max_retrans, | |
1541 | .maxlen = sizeof(unsigned int), | |
1542 | .mode = 0644, | |
6d9f239a | 1543 | .proc_handler = proc_dointvec, |
a999e683 | 1544 | }, |
f8572d8f | 1545 | { } |
a999e683 PM |
1546 | }; |
1547 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ | |
933a41e7 PM |
1548 | #endif /* CONFIG_SYSCTL */ |
1549 | ||
61075af5 | 1550 | struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4 __read_mostly = |
9fb9cbb1 YK |
1551 | { |
1552 | .l3proto = PF_INET, | |
605dcad6 | 1553 | .l4proto = IPPROTO_TCP, |
9fb9cbb1 YK |
1554 | .name = "tcp", |
1555 | .pkt_to_tuple = tcp_pkt_to_tuple, | |
1556 | .invert_tuple = tcp_invert_tuple, | |
1557 | .print_tuple = tcp_print_tuple, | |
1558 | .print_conntrack = tcp_print_conntrack, | |
1559 | .packet = tcp_packet, | |
2c8503f5 | 1560 | .get_timeouts = tcp_get_timeouts, |
9fb9cbb1 | 1561 | .new = tcp_new, |
96f6bf82 | 1562 | .error = tcp_error, |
c0cd1156 | 1563 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
fdf70832 | 1564 | .to_nlattr = tcp_to_nlattr, |
a400c30e | 1565 | .nlattr_size = tcp_nlattr_size, |
fdf70832 PM |
1566 | .from_nlattr = nlattr_to_tcp, |
1567 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, | |
1568 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, | |
a400c30e | 1569 | .nlattr_tuple_size = tcp_nlattr_tuple_size, |
f73e924c | 1570 | .nla_policy = nf_ct_port_nla_policy, |
c1d10adb | 1571 | #endif |
50978462 PNA |
1572 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
1573 | .ctnl_timeout = { | |
1574 | .nlattr_to_obj = tcp_timeout_nlattr_to_obj, | |
1575 | .obj_to_nlattr = tcp_timeout_obj_to_nlattr, | |
1576 | .nlattr_max = CTA_TIMEOUT_TCP_MAX, | |
1577 | .obj_size = sizeof(unsigned int) * | |
1578 | TCP_CONNTRACK_TIMEOUT_MAX, | |
1579 | .nla_policy = tcp_timeout_nla_policy, | |
1580 | }, | |
1581 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ | |
933a41e7 PM |
1582 | #ifdef CONFIG_SYSCTL |
1583 | .ctl_table_users = &tcp_sysctl_table_users, | |
1584 | .ctl_table_header = &tcp_sysctl_header, | |
1585 | .ctl_table = tcp_sysctl_table, | |
a999e683 PM |
1586 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
1587 | .ctl_compat_table = tcp_compat_sysctl_table, | |
1588 | #endif | |
933a41e7 | 1589 | #endif |
9fb9cbb1 | 1590 | }; |
13b18339 | 1591 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp4); |
9fb9cbb1 | 1592 | |
61075af5 | 1593 | struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6 __read_mostly = |
9fb9cbb1 YK |
1594 | { |
1595 | .l3proto = PF_INET6, | |
605dcad6 | 1596 | .l4proto = IPPROTO_TCP, |
9fb9cbb1 YK |
1597 | .name = "tcp", |
1598 | .pkt_to_tuple = tcp_pkt_to_tuple, | |
1599 | .invert_tuple = tcp_invert_tuple, | |
1600 | .print_tuple = tcp_print_tuple, | |
1601 | .print_conntrack = tcp_print_conntrack, | |
1602 | .packet = tcp_packet, | |
2c8503f5 | 1603 | .get_timeouts = tcp_get_timeouts, |
9fb9cbb1 | 1604 | .new = tcp_new, |
96f6bf82 | 1605 | .error = tcp_error, |
c0cd1156 | 1606 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
fdf70832 | 1607 | .to_nlattr = tcp_to_nlattr, |
a400c30e | 1608 | .nlattr_size = tcp_nlattr_size, |
fdf70832 PM |
1609 | .from_nlattr = nlattr_to_tcp, |
1610 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, | |
1611 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, | |
a400c30e | 1612 | .nlattr_tuple_size = tcp_nlattr_tuple_size, |
f73e924c | 1613 | .nla_policy = nf_ct_port_nla_policy, |
c1d10adb | 1614 | #endif |
50978462 PNA |
1615 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
1616 | .ctnl_timeout = { | |
1617 | .nlattr_to_obj = tcp_timeout_nlattr_to_obj, | |
1618 | .obj_to_nlattr = tcp_timeout_obj_to_nlattr, | |
1619 | .nlattr_max = CTA_TIMEOUT_TCP_MAX, | |
1620 | .obj_size = sizeof(unsigned int) * | |
1621 | TCP_CONNTRACK_TIMEOUT_MAX, | |
1622 | .nla_policy = tcp_timeout_nla_policy, | |
1623 | }, | |
1624 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ | |
933a41e7 PM |
1625 | #ifdef CONFIG_SYSCTL |
1626 | .ctl_table_users = &tcp_sysctl_table_users, | |
1627 | .ctl_table_header = &tcp_sysctl_header, | |
1628 | .ctl_table = tcp_sysctl_table, | |
1629 | #endif | |
9fb9cbb1 | 1630 | }; |
13b18339 | 1631 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp6); |