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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> | |
18 | ||
19 | #include <net/tcp.h> | |
20 | ||
21 | #include <linux/netfilter.h> | |
22 | #include <linux/netfilter_ipv4.h> | |
23 | #include <linux/netfilter_ipv6.h> | |
24 | #include <net/netfilter/nf_conntrack.h> | |
605dcad6 | 25 | #include <net/netfilter/nf_conntrack_l4proto.h> |
f6180121 | 26 | #include <net/netfilter/nf_conntrack_ecache.h> |
f01ffbd6 | 27 | #include <net/netfilter/nf_log.h> |
9fb9cbb1 | 28 | |
c88130bc | 29 | /* Protects ct->proto.tcp */ |
9fb9cbb1 YK |
30 | static DEFINE_RWLOCK(tcp_lock); |
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", | |
59 | "LISTEN" | |
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 | ||
9fb9cbb1 | 67 | /* RFC1122 says the R2 limit should be at least 100 seconds. |
601e68e1 | 68 | Linux uses 15 packets as limit, which corresponds |
9fb9cbb1 | 69 | to ~13-30min depending on RTO. */ |
ae375044 PM |
70 | static unsigned int nf_ct_tcp_timeout_max_retrans __read_mostly = 5 MINS; |
71 | static unsigned int nf_ct_tcp_timeout_unacknowledged __read_mostly = 5 MINS; | |
601e68e1 | 72 | |
2d646286 PM |
73 | static unsigned int tcp_timeouts[TCP_CONNTRACK_MAX] __read_mostly = { |
74 | [TCP_CONNTRACK_SYN_SENT] = 2 MINS, | |
75 | [TCP_CONNTRACK_SYN_RECV] = 60 SECS, | |
76 | [TCP_CONNTRACK_ESTABLISHED] = 5 DAYS, | |
77 | [TCP_CONNTRACK_FIN_WAIT] = 2 MINS, | |
78 | [TCP_CONNTRACK_CLOSE_WAIT] = 60 SECS, | |
79 | [TCP_CONNTRACK_LAST_ACK] = 30 SECS, | |
80 | [TCP_CONNTRACK_TIME_WAIT] = 2 MINS, | |
81 | [TCP_CONNTRACK_CLOSE] = 10 SECS, | |
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 | |
93 | #define sLI TCP_CONNTRACK_LISTEN | |
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 |
9fb9cbb1 YK |
123 | * SYN_RECV: SYN-ACK packet seen |
124 | * ESTABLISHED: ACK packet seen | |
125 | * FIN_WAIT: FIN packet seen | |
601e68e1 | 126 | * CLOSE_WAIT: ACK seen (after FIN) |
9fb9cbb1 YK |
127 | * LAST_ACK: FIN seen (after FIN) |
128 | * TIME_WAIT: last ACK seen | |
b2155e7f | 129 | * CLOSE: closed connection (RST) |
9fb9cbb1 YK |
130 | * |
131 | * LISTEN state is not used. | |
132 | * | |
133 | * Packets marked as IGNORED (sIG): | |
601e68e1 YH |
134 | * if they may be either invalid or valid |
135 | * and the receiver may send back a connection | |
9fb9cbb1 YK |
136 | * closing RST or a SYN/ACK. |
137 | * | |
138 | * Packets marked as INVALID (sIV): | |
139 | * if they are invalid | |
140 | * or we do not support the request (simultaneous open) | |
141 | */ | |
a5e73c29 | 142 | static const u8 tcp_conntracks[2][6][TCP_CONNTRACK_MAX] = { |
9fb9cbb1 YK |
143 | { |
144 | /* ORIGINAL */ | |
145 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
146 | /*syn*/ { sSS, sSS, sIG, sIG, sIG, sIG, sIG, sSS, sSS, sIV }, | |
147 | /* | |
148 | * sNO -> sSS Initialize a new connection | |
149 | * sSS -> sSS Retransmitted SYN | |
150 | * sSR -> sIG Late retransmitted SYN? | |
151 | * sES -> sIG Error: SYNs in window outside the SYN_SENT state | |
601e68e1 | 152 | * are errors. Receiver will reply with RST |
9fb9cbb1 YK |
153 | * and close the connection. |
154 | * Or we are not in sync and hold a dead connection. | |
155 | * sFW -> sIG | |
156 | * sCW -> sIG | |
157 | * sLA -> sIG | |
158 | * sTW -> sSS Reopened connection (RFC 1122). | |
159 | * sCL -> sSS | |
160 | */ | |
161 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
162 | /*synack*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV }, | |
163 | /* | |
164 | * A SYN/ACK from the client is always invalid: | |
601e68e1 | 165 | * - either it tries to set up a simultaneous open, which is |
9fb9cbb1 YK |
166 | * not supported; |
167 | * - or the firewall has just been inserted between the two hosts | |
601e68e1 | 168 | * during the session set-up. The SYN will be retransmitted |
9fb9cbb1 YK |
169 | * by the true client (or it'll time out). |
170 | */ | |
171 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
172 | /*fin*/ { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV }, | |
173 | /* | |
174 | * sNO -> sIV Too late and no reason to do anything... | |
175 | * sSS -> sIV Client migth not send FIN in this state: | |
176 | * we enforce waiting for a SYN/ACK reply first. | |
177 | * sSR -> sFW Close started. | |
178 | * sES -> sFW | |
179 | * sFW -> sLA FIN seen in both directions, waiting for | |
601e68e1 | 180 | * the last ACK. |
9fb9cbb1 YK |
181 | * Migth be a retransmitted FIN as well... |
182 | * sCW -> sLA | |
183 | * sLA -> sLA Retransmitted FIN. Remain in the same state. | |
184 | * sTW -> sTW | |
185 | * sCL -> sCL | |
186 | */ | |
187 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
188 | /*ack*/ { sES, sIV, sES, sES, sCW, sCW, sTW, sTW, sCL, sIV }, | |
189 | /* | |
190 | * sNO -> sES Assumed. | |
191 | * sSS -> sIV ACK is invalid: we haven't seen a SYN/ACK yet. | |
192 | * sSR -> sES Established state is reached. | |
193 | * sES -> sES :-) | |
194 | * sFW -> sCW Normal close request answered by ACK. | |
195 | * sCW -> sCW | |
196 | * sLA -> sTW Last ACK detected. | |
197 | * sTW -> sTW Retransmitted last ACK. Remain in the same state. | |
198 | * sCL -> sCL | |
199 | */ | |
200 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
201 | /*rst*/ { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV }, | |
202 | /*none*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV } | |
203 | }, | |
204 | { | |
205 | /* REPLY */ | |
206 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
207 | /*syn*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV }, | |
208 | /* | |
209 | * sNO -> sIV Never reached. | |
210 | * sSS -> sIV Simultaneous open, not supported | |
211 | * sSR -> sIV Simultaneous open, not supported. | |
212 | * sES -> sIV Server may not initiate a connection. | |
213 | * sFW -> sIV | |
214 | * sCW -> sIV | |
215 | * sLA -> sIV | |
216 | * sTW -> sIV Reopened connection, but server may not do it. | |
217 | * sCL -> sIV | |
218 | */ | |
219 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
220 | /*synack*/ { sIV, sSR, sSR, sIG, sIG, sIG, sIG, sIG, sIG, sIV }, | |
221 | /* | |
222 | * sSS -> sSR Standard open. | |
223 | * sSR -> sSR Retransmitted SYN/ACK. | |
224 | * sES -> sIG Late retransmitted SYN/ACK? | |
225 | * sFW -> sIG Might be SYN/ACK answering ignored SYN | |
226 | * sCW -> sIG | |
227 | * sLA -> sIG | |
228 | * sTW -> sIG | |
229 | * sCL -> sIG | |
230 | */ | |
231 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
232 | /*fin*/ { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV }, | |
233 | /* | |
234 | * sSS -> sIV Server might not send FIN in this state. | |
235 | * sSR -> sFW Close started. | |
236 | * sES -> sFW | |
237 | * sFW -> sLA FIN seen in both directions. | |
238 | * sCW -> sLA | |
239 | * sLA -> sLA Retransmitted FIN. | |
240 | * sTW -> sTW | |
241 | * sCL -> sCL | |
242 | */ | |
243 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
73f30602 | 244 | /*ack*/ { sIV, sIG, sSR, sES, sCW, sCW, sTW, sTW, sCL, sIV }, |
9fb9cbb1 | 245 | /* |
73f30602 | 246 | * sSS -> sIG Might be a half-open connection. |
9fb9cbb1 YK |
247 | * sSR -> sSR Might answer late resent SYN. |
248 | * sES -> sES :-) | |
249 | * sFW -> sCW Normal close request answered by ACK. | |
250 | * sCW -> sCW | |
251 | * sLA -> sTW Last ACK detected. | |
252 | * sTW -> sTW Retransmitted last ACK. | |
253 | * sCL -> sCL | |
254 | */ | |
255 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
256 | /*rst*/ { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV }, | |
257 | /*none*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV } | |
601e68e1 | 258 | } |
9fb9cbb1 YK |
259 | }; |
260 | ||
09f263cd JE |
261 | static bool tcp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff, |
262 | struct nf_conntrack_tuple *tuple) | |
9fb9cbb1 | 263 | { |
82f568fc JE |
264 | const struct tcphdr *hp; |
265 | struct tcphdr _hdr; | |
9fb9cbb1 YK |
266 | |
267 | /* Actually only need first 8 bytes. */ | |
268 | hp = skb_header_pointer(skb, dataoff, 8, &_hdr); | |
269 | if (hp == NULL) | |
09f263cd | 270 | return false; |
9fb9cbb1 YK |
271 | |
272 | tuple->src.u.tcp.port = hp->source; | |
273 | tuple->dst.u.tcp.port = hp->dest; | |
274 | ||
09f263cd | 275 | return true; |
9fb9cbb1 YK |
276 | } |
277 | ||
09f263cd JE |
278 | static bool tcp_invert_tuple(struct nf_conntrack_tuple *tuple, |
279 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 YK |
280 | { |
281 | tuple->src.u.tcp.port = orig->dst.u.tcp.port; | |
282 | tuple->dst.u.tcp.port = orig->src.u.tcp.port; | |
09f263cd | 283 | return true; |
9fb9cbb1 YK |
284 | } |
285 | ||
286 | /* Print out the per-protocol part of the tuple. */ | |
287 | static int tcp_print_tuple(struct seq_file *s, | |
288 | const struct nf_conntrack_tuple *tuple) | |
289 | { | |
290 | return seq_printf(s, "sport=%hu dport=%hu ", | |
291 | ntohs(tuple->src.u.tcp.port), | |
292 | ntohs(tuple->dst.u.tcp.port)); | |
293 | } | |
294 | ||
295 | /* Print out the private part of the conntrack. */ | |
c88130bc | 296 | static int tcp_print_conntrack(struct seq_file *s, const struct nf_conn *ct) |
9fb9cbb1 YK |
297 | { |
298 | enum tcp_conntrack state; | |
299 | ||
300 | read_lock_bh(&tcp_lock); | |
c88130bc | 301 | state = ct->proto.tcp.state; |
9fb9cbb1 YK |
302 | read_unlock_bh(&tcp_lock); |
303 | ||
304 | return seq_printf(s, "%s ", tcp_conntrack_names[state]); | |
305 | } | |
306 | ||
307 | static unsigned int get_conntrack_index(const struct tcphdr *tcph) | |
308 | { | |
309 | if (tcph->rst) return TCP_RST_SET; | |
310 | else if (tcph->syn) return (tcph->ack ? TCP_SYNACK_SET : TCP_SYN_SET); | |
311 | else if (tcph->fin) return TCP_FIN_SET; | |
312 | else if (tcph->ack) return TCP_ACK_SET; | |
313 | else return TCP_NONE_SET; | |
314 | } | |
315 | ||
316 | /* TCP connection tracking based on 'Real Stateful TCP Packet Filtering | |
317 | in IP Filter' by Guido van Rooij. | |
601e68e1 | 318 | |
9fb9cbb1 YK |
319 | http://www.nluug.nl/events/sane2000/papers.html |
320 | http://www.iae.nl/users/guido/papers/tcp_filtering.ps.gz | |
601e68e1 | 321 | |
9fb9cbb1 YK |
322 | The boundaries and the conditions are changed according to RFC793: |
323 | the packet must intersect the window (i.e. segments may be | |
324 | after the right or before the left edge) and thus receivers may ACK | |
325 | segments after the right edge of the window. | |
326 | ||
601e68e1 | 327 | td_maxend = max(sack + max(win,1)) seen in reply packets |
9fb9cbb1 YK |
328 | td_maxwin = max(max(win, 1)) + (sack - ack) seen in sent packets |
329 | td_maxwin += seq + len - sender.td_maxend | |
330 | if seq + len > sender.td_maxend | |
331 | td_end = max(seq + len) seen in sent packets | |
601e68e1 | 332 | |
9fb9cbb1 YK |
333 | I. Upper bound for valid data: seq <= sender.td_maxend |
334 | II. Lower bound for valid data: seq + len >= sender.td_end - receiver.td_maxwin | |
84ebe1cd JK |
335 | III. Upper bound for valid (s)ack: sack <= receiver.td_end |
336 | IV. Lower bound for valid (s)ack: sack >= receiver.td_end - MAXACKWINDOW | |
9fb9cbb1 | 337 | |
84ebe1cd JK |
338 | where sack is the highest right edge of sack block found in the packet |
339 | or ack in the case of packet without SACK option. | |
9fb9cbb1 | 340 | |
84ebe1cd | 341 | The upper bound limit for a valid (s)ack is not ignored - |
601e68e1 | 342 | we doesn't have to deal with fragments. |
9fb9cbb1 YK |
343 | */ |
344 | ||
345 | static inline __u32 segment_seq_plus_len(__u32 seq, | |
346 | size_t len, | |
347 | unsigned int dataoff, | |
82f568fc | 348 | const struct tcphdr *tcph) |
9fb9cbb1 YK |
349 | { |
350 | /* XXX Should I use payload length field in IP/IPv6 header ? | |
351 | * - YK */ | |
352 | return (seq + len - dataoff - tcph->doff*4 | |
353 | + (tcph->syn ? 1 : 0) + (tcph->fin ? 1 : 0)); | |
354 | } | |
601e68e1 | 355 | |
9fb9cbb1 YK |
356 | /* Fixme: what about big packets? */ |
357 | #define MAXACKWINCONST 66000 | |
358 | #define MAXACKWINDOW(sender) \ | |
359 | ((sender)->td_maxwin > MAXACKWINCONST ? (sender)->td_maxwin \ | |
360 | : MAXACKWINCONST) | |
601e68e1 | 361 | |
9fb9cbb1 YK |
362 | /* |
363 | * Simplified tcp_parse_options routine from tcp_input.c | |
364 | */ | |
365 | static void tcp_options(const struct sk_buff *skb, | |
366 | unsigned int dataoff, | |
82f568fc | 367 | const struct tcphdr *tcph, |
9fb9cbb1 YK |
368 | struct ip_ct_tcp_state *state) |
369 | { | |
370 | unsigned char buff[(15 * 4) - sizeof(struct tcphdr)]; | |
82f568fc | 371 | const unsigned char *ptr; |
9fb9cbb1 YK |
372 | int length = (tcph->doff*4) - sizeof(struct tcphdr); |
373 | ||
374 | if (!length) | |
375 | return; | |
376 | ||
377 | ptr = skb_header_pointer(skb, dataoff + sizeof(struct tcphdr), | |
378 | length, buff); | |
379 | BUG_ON(ptr == NULL); | |
380 | ||
601e68e1 | 381 | state->td_scale = |
9fb9cbb1 YK |
382 | state->flags = 0; |
383 | ||
384 | while (length > 0) { | |
385 | int opcode=*ptr++; | |
386 | int opsize; | |
387 | ||
388 | switch (opcode) { | |
389 | case TCPOPT_EOL: | |
390 | return; | |
391 | case TCPOPT_NOP: /* Ref: RFC 793 section 3.1 */ | |
392 | length--; | |
393 | continue; | |
394 | default: | |
395 | opsize=*ptr++; | |
396 | if (opsize < 2) /* "silly options" */ | |
397 | return; | |
398 | if (opsize > length) | |
399 | break; /* don't parse partial options */ | |
400 | ||
601e68e1 | 401 | if (opcode == TCPOPT_SACK_PERM |
9fb9cbb1 YK |
402 | && opsize == TCPOLEN_SACK_PERM) |
403 | state->flags |= IP_CT_TCP_FLAG_SACK_PERM; | |
404 | else if (opcode == TCPOPT_WINDOW | |
405 | && opsize == TCPOLEN_WINDOW) { | |
406 | state->td_scale = *(u_int8_t *)ptr; | |
407 | ||
408 | if (state->td_scale > 14) { | |
409 | /* See RFC1323 */ | |
410 | state->td_scale = 14; | |
411 | } | |
412 | state->flags |= | |
413 | IP_CT_TCP_FLAG_WINDOW_SCALE; | |
414 | } | |
415 | ptr += opsize - 2; | |
416 | length -= opsize; | |
417 | } | |
418 | } | |
419 | } | |
420 | ||
421 | static void tcp_sack(const struct sk_buff *skb, unsigned int dataoff, | |
82f568fc | 422 | const struct tcphdr *tcph, __u32 *sack) |
9fb9cbb1 | 423 | { |
601e68e1 | 424 | unsigned char buff[(15 * 4) - sizeof(struct tcphdr)]; |
82f568fc | 425 | const unsigned char *ptr; |
9fb9cbb1 YK |
426 | int length = (tcph->doff*4) - sizeof(struct tcphdr); |
427 | __u32 tmp; | |
428 | ||
429 | if (!length) | |
430 | return; | |
431 | ||
432 | ptr = skb_header_pointer(skb, dataoff + sizeof(struct tcphdr), | |
433 | length, buff); | |
434 | BUG_ON(ptr == NULL); | |
435 | ||
436 | /* Fast path for timestamp-only option */ | |
437 | if (length == TCPOLEN_TSTAMP_ALIGNED*4 | |
8f05ce91 YH |
438 | && *(__be32 *)ptr == htonl((TCPOPT_NOP << 24) |
439 | | (TCPOPT_NOP << 16) | |
440 | | (TCPOPT_TIMESTAMP << 8) | |
441 | | TCPOLEN_TIMESTAMP)) | |
9fb9cbb1 YK |
442 | return; |
443 | ||
444 | while (length > 0) { | |
445 | int opcode = *ptr++; | |
446 | int opsize, i; | |
447 | ||
448 | switch (opcode) { | |
449 | case TCPOPT_EOL: | |
450 | return; | |
451 | case TCPOPT_NOP: /* Ref: RFC 793 section 3.1 */ | |
452 | length--; | |
453 | continue; | |
454 | default: | |
455 | opsize = *ptr++; | |
456 | if (opsize < 2) /* "silly options" */ | |
457 | return; | |
458 | if (opsize > length) | |
459 | break; /* don't parse partial options */ | |
460 | ||
601e68e1 YH |
461 | if (opcode == TCPOPT_SACK |
462 | && opsize >= (TCPOLEN_SACK_BASE | |
463 | + TCPOLEN_SACK_PERBLOCK) | |
464 | && !((opsize - TCPOLEN_SACK_BASE) | |
465 | % TCPOLEN_SACK_PERBLOCK)) { | |
466 | for (i = 0; | |
467 | i < (opsize - TCPOLEN_SACK_BASE); | |
468 | i += TCPOLEN_SACK_PERBLOCK) { | |
469 | tmp = ntohl(*((__be32 *)(ptr+i)+1)); | |
9fb9cbb1 YK |
470 | |
471 | if (after(tmp, *sack)) | |
472 | *sack = tmp; | |
473 | } | |
474 | return; | |
475 | } | |
476 | ptr += opsize - 2; | |
477 | length -= opsize; | |
478 | } | |
479 | } | |
480 | } | |
481 | ||
09f263cd JE |
482 | static bool tcp_in_window(const struct nf_conn *ct, |
483 | struct ip_ct_tcp *state, | |
484 | enum ip_conntrack_dir dir, | |
485 | unsigned int index, | |
486 | const struct sk_buff *skb, | |
487 | unsigned int dataoff, | |
488 | const struct tcphdr *tcph, | |
76108cea | 489 | u_int8_t pf) |
9fb9cbb1 | 490 | { |
c2a2c7e0 | 491 | struct net *net = nf_ct_net(ct); |
9fb9cbb1 YK |
492 | struct ip_ct_tcp_state *sender = &state->seen[dir]; |
493 | struct ip_ct_tcp_state *receiver = &state->seen[!dir]; | |
82f568fc | 494 | const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple; |
9fb9cbb1 | 495 | __u32 seq, ack, sack, end, win, swin; |
09f263cd | 496 | bool res; |
9fb9cbb1 YK |
497 | |
498 | /* | |
499 | * Get the required data from the packet. | |
500 | */ | |
501 | seq = ntohl(tcph->seq); | |
502 | ack = sack = ntohl(tcph->ack_seq); | |
503 | win = ntohs(tcph->window); | |
504 | end = segment_seq_plus_len(seq, skb->len, dataoff, tcph); | |
505 | ||
506 | if (receiver->flags & IP_CT_TCP_FLAG_SACK_PERM) | |
507 | tcp_sack(skb, dataoff, tcph, &sack); | |
508 | ||
0d53778e PM |
509 | pr_debug("tcp_in_window: START\n"); |
510 | pr_debug("tcp_in_window: "); | |
3c9fba65 | 511 | nf_ct_dump_tuple(tuple); |
0d53778e PM |
512 | pr_debug("seq=%u ack=%u sack=%u win=%u end=%u\n", |
513 | seq, ack, sack, win, end); | |
514 | pr_debug("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i " | |
515 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", | |
516 | sender->td_end, sender->td_maxend, sender->td_maxwin, | |
517 | sender->td_scale, | |
518 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, | |
519 | receiver->td_scale); | |
9fb9cbb1 YK |
520 | |
521 | if (sender->td_end == 0) { | |
522 | /* | |
523 | * Initialize sender data. | |
524 | */ | |
525 | if (tcph->syn && tcph->ack) { | |
526 | /* | |
527 | * Outgoing SYN-ACK in reply to a SYN. | |
528 | */ | |
601e68e1 | 529 | sender->td_end = |
9fb9cbb1 YK |
530 | sender->td_maxend = end; |
531 | sender->td_maxwin = (win == 0 ? 1 : win); | |
532 | ||
533 | tcp_options(skb, dataoff, tcph, sender); | |
601e68e1 | 534 | /* |
9fb9cbb1 YK |
535 | * RFC 1323: |
536 | * Both sides must send the Window Scale option | |
537 | * to enable window scaling in either direction. | |
538 | */ | |
539 | if (!(sender->flags & IP_CT_TCP_FLAG_WINDOW_SCALE | |
540 | && receiver->flags & IP_CT_TCP_FLAG_WINDOW_SCALE)) | |
601e68e1 | 541 | sender->td_scale = |
9fb9cbb1 YK |
542 | receiver->td_scale = 0; |
543 | } else { | |
544 | /* | |
545 | * We are in the middle of a connection, | |
546 | * its history is lost for us. | |
547 | * Let's try to use the data from the packet. | |
601e68e1 | 548 | */ |
9fb9cbb1 YK |
549 | sender->td_end = end; |
550 | sender->td_maxwin = (win == 0 ? 1 : win); | |
551 | sender->td_maxend = end + sender->td_maxwin; | |
552 | } | |
553 | } else if (((state->state == TCP_CONNTRACK_SYN_SENT | |
554 | && dir == IP_CT_DIR_ORIGINAL) | |
555 | || (state->state == TCP_CONNTRACK_SYN_RECV | |
556 | && dir == IP_CT_DIR_REPLY)) | |
557 | && after(end, sender->td_end)) { | |
558 | /* | |
559 | * RFC 793: "if a TCP is reinitialized ... then it need | |
601e68e1 | 560 | * not wait at all; it must only be sure to use sequence |
9fb9cbb1 YK |
561 | * numbers larger than those recently used." |
562 | */ | |
563 | sender->td_end = | |
564 | sender->td_maxend = end; | |
565 | sender->td_maxwin = (win == 0 ? 1 : win); | |
566 | ||
567 | tcp_options(skb, dataoff, tcph, sender); | |
568 | } | |
569 | ||
570 | if (!(tcph->ack)) { | |
571 | /* | |
572 | * If there is no ACK, just pretend it was set and OK. | |
573 | */ | |
574 | ack = sack = receiver->td_end; | |
601e68e1 YH |
575 | } else if (((tcp_flag_word(tcph) & (TCP_FLAG_ACK|TCP_FLAG_RST)) == |
576 | (TCP_FLAG_ACK|TCP_FLAG_RST)) | |
9fb9cbb1 YK |
577 | && (ack == 0)) { |
578 | /* | |
579 | * Broken TCP stacks, that set ACK in RST packets as well | |
580 | * with zero ack value. | |
581 | */ | |
582 | ack = sack = receiver->td_end; | |
583 | } | |
584 | ||
585 | if (seq == end | |
586 | && (!tcph->rst | |
587 | || (seq == 0 && state->state == TCP_CONNTRACK_SYN_SENT))) | |
588 | /* | |
589 | * Packets contains no data: we assume it is valid | |
590 | * and check the ack value only. | |
591 | * However RST segments are always validated by their | |
592 | * SEQ number, except when seq == 0 (reset sent answering | |
593 | * SYN. | |
594 | */ | |
595 | seq = end = sender->td_end; | |
596 | ||
0d53778e | 597 | pr_debug("tcp_in_window: "); |
3c9fba65 | 598 | nf_ct_dump_tuple(tuple); |
0d53778e PM |
599 | pr_debug("seq=%u ack=%u sack =%u win=%u end=%u\n", |
600 | seq, ack, sack, win, end); | |
601 | pr_debug("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i " | |
602 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", | |
603 | sender->td_end, sender->td_maxend, sender->td_maxwin, | |
604 | sender->td_scale, | |
605 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, | |
606 | receiver->td_scale); | |
607 | ||
608 | pr_debug("tcp_in_window: I=%i II=%i III=%i IV=%i\n", | |
609 | before(seq, sender->td_maxend + 1), | |
610 | after(end, sender->td_end - receiver->td_maxwin - 1), | |
611 | before(sack, receiver->td_end + 1), | |
84ebe1cd | 612 | after(sack, receiver->td_end - MAXACKWINDOW(sender) - 1)); |
9fb9cbb1 | 613 | |
a09113c2 PM |
614 | if (before(seq, sender->td_maxend + 1) && |
615 | after(end, sender->td_end - receiver->td_maxwin - 1) && | |
616 | before(sack, receiver->td_end + 1) && | |
84ebe1cd | 617 | after(sack, receiver->td_end - MAXACKWINDOW(sender) - 1)) { |
601e68e1 | 618 | /* |
9fb9cbb1 YK |
619 | * Take into account window scaling (RFC 1323). |
620 | */ | |
621 | if (!tcph->syn) | |
622 | win <<= sender->td_scale; | |
623 | ||
624 | /* | |
625 | * Update sender data. | |
626 | */ | |
627 | swin = win + (sack - ack); | |
628 | if (sender->td_maxwin < swin) | |
629 | sender->td_maxwin = swin; | |
ae375044 | 630 | if (after(end, sender->td_end)) { |
9fb9cbb1 | 631 | sender->td_end = end; |
ae375044 PM |
632 | sender->flags |= IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED; |
633 | } | |
9fb9cbb1 YK |
634 | /* |
635 | * Update receiver data. | |
636 | */ | |
637 | if (after(end, sender->td_maxend)) | |
638 | receiver->td_maxwin += end - sender->td_maxend; | |
639 | if (after(sack + win, receiver->td_maxend - 1)) { | |
640 | receiver->td_maxend = sack + win; | |
641 | if (win == 0) | |
642 | receiver->td_maxend++; | |
643 | } | |
ae375044 PM |
644 | if (ack == receiver->td_end) |
645 | receiver->flags &= ~IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED; | |
9fb9cbb1 | 646 | |
601e68e1 | 647 | /* |
9fb9cbb1 YK |
648 | * Check retransmissions. |
649 | */ | |
650 | if (index == TCP_ACK_SET) { | |
651 | if (state->last_dir == dir | |
652 | && state->last_seq == seq | |
653 | && state->last_ack == ack | |
c1fe3ca5 GH |
654 | && state->last_end == end |
655 | && state->last_win == win) | |
9fb9cbb1 YK |
656 | state->retrans++; |
657 | else { | |
658 | state->last_dir = dir; | |
659 | state->last_seq = seq; | |
660 | state->last_ack = ack; | |
661 | state->last_end = end; | |
c1fe3ca5 | 662 | state->last_win = win; |
9fb9cbb1 YK |
663 | state->retrans = 0; |
664 | } | |
665 | } | |
09f263cd | 666 | res = true; |
9fb9cbb1 | 667 | } else { |
09f263cd | 668 | res = false; |
a09113c2 PM |
669 | if (sender->flags & IP_CT_TCP_FLAG_BE_LIBERAL || |
670 | nf_ct_tcp_be_liberal) | |
09f263cd | 671 | res = true; |
c2a2c7e0 | 672 | if (!res && LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 YK |
673 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
674 | "nf_ct_tcp: %s ", | |
675 | before(seq, sender->td_maxend + 1) ? | |
676 | after(end, sender->td_end - receiver->td_maxwin - 1) ? | |
677 | before(sack, receiver->td_end + 1) ? | |
678 | after(ack, receiver->td_end - MAXACKWINDOW(sender)) ? "BUG" | |
679 | : "ACK is under the lower bound (possible overly delayed ACK)" | |
680 | : "ACK is over the upper bound (ACKed data not seen yet)" | |
681 | : "SEQ is under the lower bound (already ACKed data retransmitted)" | |
682 | : "SEQ is over the upper bound (over the window of the receiver)"); | |
601e68e1 YH |
683 | } |
684 | ||
09f263cd | 685 | pr_debug("tcp_in_window: res=%u sender end=%u maxend=%u maxwin=%u " |
0d53778e PM |
686 | "receiver end=%u maxend=%u maxwin=%u\n", |
687 | res, sender->td_end, sender->td_maxend, sender->td_maxwin, | |
688 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin); | |
9fb9cbb1 YK |
689 | |
690 | return res; | |
691 | } | |
692 | ||
5b1158e9 | 693 | #ifdef CONFIG_NF_NAT_NEEDED |
9fb9cbb1 YK |
694 | /* Update sender->td_end after NAT successfully mangled the packet */ |
695 | /* Caller must linearize skb at tcp header. */ | |
82f568fc | 696 | void nf_conntrack_tcp_update(const struct sk_buff *skb, |
9fb9cbb1 | 697 | unsigned int dataoff, |
c88130bc | 698 | struct nf_conn *ct, |
9fb9cbb1 YK |
699 | int dir) |
700 | { | |
82f568fc JE |
701 | const struct tcphdr *tcph = (const void *)skb->data + dataoff; |
702 | const struct ip_ct_tcp_state *sender = &ct->proto.tcp.seen[dir]; | |
703 | const struct ip_ct_tcp_state *receiver = &ct->proto.tcp.seen[!dir]; | |
0d53778e | 704 | __u32 end; |
9fb9cbb1 YK |
705 | |
706 | end = segment_seq_plus_len(ntohl(tcph->seq), skb->len, dataoff, tcph); | |
707 | ||
708 | write_lock_bh(&tcp_lock); | |
709 | /* | |
710 | * We have to worry for the ack in the reply packet only... | |
711 | */ | |
c88130bc PM |
712 | if (after(end, ct->proto.tcp.seen[dir].td_end)) |
713 | ct->proto.tcp.seen[dir].td_end = end; | |
714 | ct->proto.tcp.last_end = end; | |
9fb9cbb1 | 715 | write_unlock_bh(&tcp_lock); |
0d53778e PM |
716 | pr_debug("tcp_update: sender end=%u maxend=%u maxwin=%u scale=%i " |
717 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", | |
718 | sender->td_end, sender->td_maxend, sender->td_maxwin, | |
719 | sender->td_scale, | |
720 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, | |
721 | receiver->td_scale); | |
9fb9cbb1 | 722 | } |
13b18339 | 723 | EXPORT_SYMBOL_GPL(nf_conntrack_tcp_update); |
9fb9cbb1 YK |
724 | #endif |
725 | ||
726 | #define TH_FIN 0x01 | |
727 | #define TH_SYN 0x02 | |
728 | #define TH_RST 0x04 | |
729 | #define TH_PUSH 0x08 | |
730 | #define TH_ACK 0x10 | |
731 | #define TH_URG 0x20 | |
732 | #define TH_ECE 0x40 | |
733 | #define TH_CWR 0x80 | |
734 | ||
5c8ce7c9 | 735 | /* table of valid flag combinations - PUSH, ECE and CWR are always valid */ |
82f568fc | 736 | static const u8 tcp_valid_flags[(TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG) + 1] = |
9fb9cbb1 YK |
737 | { |
738 | [TH_SYN] = 1, | |
d3ab4298 | 739 | [TH_SYN|TH_URG] = 1, |
d3ab4298 | 740 | [TH_SYN|TH_ACK] = 1, |
9fb9cbb1 YK |
741 | [TH_RST] = 1, |
742 | [TH_RST|TH_ACK] = 1, | |
9fb9cbb1 | 743 | [TH_FIN|TH_ACK] = 1, |
5c8ce7c9 | 744 | [TH_FIN|TH_ACK|TH_URG] = 1, |
9fb9cbb1 | 745 | [TH_ACK] = 1, |
9fb9cbb1 | 746 | [TH_ACK|TH_URG] = 1, |
9fb9cbb1 YK |
747 | }; |
748 | ||
749 | /* Protect conntrack agaist broken packets. Code taken from ipt_unclean.c. */ | |
74c51a14 AD |
750 | static int tcp_error(struct net *net, |
751 | struct sk_buff *skb, | |
9fb9cbb1 YK |
752 | unsigned int dataoff, |
753 | enum ip_conntrack_info *ctinfo, | |
76108cea | 754 | u_int8_t pf, |
96f6bf82 | 755 | unsigned int hooknum) |
9fb9cbb1 | 756 | { |
82f568fc JE |
757 | const struct tcphdr *th; |
758 | struct tcphdr _tcph; | |
9fb9cbb1 YK |
759 | unsigned int tcplen = skb->len - dataoff; |
760 | u_int8_t tcpflags; | |
761 | ||
762 | /* Smaller that minimal TCP header? */ | |
763 | th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph); | |
764 | if (th == NULL) { | |
c2a2c7e0 | 765 | if (LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 YK |
766 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
767 | "nf_ct_tcp: short packet "); | |
768 | return -NF_ACCEPT; | |
601e68e1 YH |
769 | } |
770 | ||
9fb9cbb1 YK |
771 | /* Not whole TCP header or malformed packet */ |
772 | if (th->doff*4 < sizeof(struct tcphdr) || tcplen < th->doff*4) { | |
c2a2c7e0 | 773 | if (LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 YK |
774 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
775 | "nf_ct_tcp: truncated/malformed packet "); | |
776 | return -NF_ACCEPT; | |
777 | } | |
601e68e1 | 778 | |
9fb9cbb1 YK |
779 | /* Checksum invalid? Ignore. |
780 | * We skip checking packets on the outgoing path | |
84fa7933 | 781 | * because the checksum is assumed to be correct. |
9fb9cbb1 YK |
782 | */ |
783 | /* FIXME: Source route IP option packets --RR */ | |
c04d0552 | 784 | if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING && |
96f6bf82 | 785 | nf_checksum(skb, hooknum, dataoff, IPPROTO_TCP, pf)) { |
c2a2c7e0 | 786 | if (LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 YK |
787 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
788 | "nf_ct_tcp: bad TCP checksum "); | |
789 | return -NF_ACCEPT; | |
790 | } | |
791 | ||
792 | /* Check TCP flags. */ | |
5c8ce7c9 | 793 | tcpflags = (((u_int8_t *)th)[13] & ~(TH_ECE|TH_CWR|TH_PUSH)); |
9fb9cbb1 | 794 | if (!tcp_valid_flags[tcpflags]) { |
c2a2c7e0 | 795 | if (LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 YK |
796 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
797 | "nf_ct_tcp: invalid TCP flag combination "); | |
798 | return -NF_ACCEPT; | |
799 | } | |
800 | ||
801 | return NF_ACCEPT; | |
802 | } | |
803 | ||
9fb9cbb1 | 804 | /* Returns verdict for packet, or -1 for invalid. */ |
c88130bc | 805 | static int tcp_packet(struct nf_conn *ct, |
9fb9cbb1 YK |
806 | const struct sk_buff *skb, |
807 | unsigned int dataoff, | |
808 | enum ip_conntrack_info ctinfo, | |
76108cea | 809 | u_int8_t pf, |
9fb9cbb1 YK |
810 | unsigned int hooknum) |
811 | { | |
c2a2c7e0 | 812 | struct net *net = nf_ct_net(ct); |
0d53778e | 813 | struct nf_conntrack_tuple *tuple; |
9fb9cbb1 YK |
814 | enum tcp_conntrack new_state, old_state; |
815 | enum ip_conntrack_dir dir; | |
82f568fc JE |
816 | const struct tcphdr *th; |
817 | struct tcphdr _tcph; | |
9fb9cbb1 YK |
818 | unsigned long timeout; |
819 | unsigned int index; | |
820 | ||
821 | th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph); | |
822 | BUG_ON(th == NULL); | |
823 | ||
824 | write_lock_bh(&tcp_lock); | |
c88130bc | 825 | old_state = ct->proto.tcp.state; |
9fb9cbb1 YK |
826 | dir = CTINFO2DIR(ctinfo); |
827 | index = get_conntrack_index(th); | |
828 | new_state = tcp_conntracks[dir][index][old_state]; | |
c88130bc | 829 | tuple = &ct->tuplehash[dir].tuple; |
9fb9cbb1 YK |
830 | |
831 | switch (new_state) { | |
17311393 JK |
832 | case TCP_CONNTRACK_SYN_SENT: |
833 | if (old_state < TCP_CONNTRACK_TIME_WAIT) | |
834 | break; | |
b2155e7f JK |
835 | /* RFC 1122: "When a connection is closed actively, |
836 | * it MUST linger in TIME-WAIT state for a time 2xMSL | |
837 | * (Maximum Segment Lifetime). However, it MAY accept | |
838 | * a new SYN from the remote TCP to reopen the connection | |
839 | * directly from TIME-WAIT state, if..." | |
840 | * We ignore the conditions because we are in the | |
841 | * TIME-WAIT state anyway. | |
842 | * | |
843 | * Handle aborted connections: we and the server | |
844 | * think there is an existing connection but the client | |
845 | * aborts it and starts a new one. | |
846 | */ | |
847 | if (((ct->proto.tcp.seen[dir].flags | |
848 | | ct->proto.tcp.seen[!dir].flags) | |
849 | & IP_CT_TCP_FLAG_CLOSE_INIT) | |
c88130bc PM |
850 | || (ct->proto.tcp.last_dir == dir |
851 | && ct->proto.tcp.last_index == TCP_RST_SET)) { | |
bc34b841 JK |
852 | /* Attempt to reopen a closed/aborted connection. |
853 | * Delete this connection and look up again. */ | |
17311393 | 854 | write_unlock_bh(&tcp_lock); |
2aec609f | 855 | |
6b69fe0c PM |
856 | /* Only repeat if we can actually remove the timer. |
857 | * Destruction may already be in progress in process | |
858 | * context and we must give it a chance to terminate. | |
859 | */ | |
2aec609f | 860 | if (nf_ct_kill(ct)) |
6b69fe0c | 861 | return -NF_REPEAT; |
ec8d5409 | 862 | return NF_DROP; |
17311393 JK |
863 | } |
864 | /* Fall through */ | |
9fb9cbb1 | 865 | case TCP_CONNTRACK_IGNORE: |
73f30602 | 866 | /* Ignored packets: |
b2155e7f JK |
867 | * |
868 | * Our connection entry may be out of sync, so ignore | |
869 | * packets which may signal the real connection between | |
870 | * the client and the server. | |
73f30602 JK |
871 | * |
872 | * a) SYN in ORIGINAL | |
873 | * b) SYN/ACK in REPLY | |
601e68e1 | 874 | * c) ACK in reply direction after initial SYN in original. |
b2155e7f JK |
875 | * |
876 | * If the ignored packet is invalid, the receiver will send | |
877 | * a RST we'll catch below. | |
73f30602 | 878 | */ |
9fb9cbb1 | 879 | if (index == TCP_SYNACK_SET |
c88130bc PM |
880 | && ct->proto.tcp.last_index == TCP_SYN_SET |
881 | && ct->proto.tcp.last_dir != dir | |
882 | && ntohl(th->ack_seq) == ct->proto.tcp.last_end) { | |
b2155e7f | 883 | /* b) This SYN/ACK acknowledges a SYN that we earlier |
9fb9cbb1 YK |
884 | * ignored as invalid. This means that the client and |
885 | * the server are both in sync, while the firewall is | |
886 | * not. We kill this session and block the SYN/ACK so | |
601e68e1 | 887 | * that the client cannot but retransmit its SYN and |
9fb9cbb1 YK |
888 | * thus initiate a clean new session. |
889 | */ | |
601e68e1 | 890 | write_unlock_bh(&tcp_lock); |
c2a2c7e0 | 891 | if (LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 YK |
892 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
893 | "nf_ct_tcp: killing out of sync session "); | |
51091764 | 894 | nf_ct_kill(ct); |
ec8d5409 | 895 | return NF_DROP; |
9fb9cbb1 | 896 | } |
c88130bc PM |
897 | ct->proto.tcp.last_index = index; |
898 | ct->proto.tcp.last_dir = dir; | |
899 | ct->proto.tcp.last_seq = ntohl(th->seq); | |
900 | ct->proto.tcp.last_end = | |
9fb9cbb1 YK |
901 | segment_seq_plus_len(ntohl(th->seq), skb->len, dataoff, th); |
902 | ||
903 | write_unlock_bh(&tcp_lock); | |
c2a2c7e0 | 904 | if (LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 | 905 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
b2155e7f | 906 | "nf_ct_tcp: invalid packet ignored "); |
9fb9cbb1 YK |
907 | return NF_ACCEPT; |
908 | case TCP_CONNTRACK_MAX: | |
909 | /* Invalid packet */ | |
0d53778e PM |
910 | pr_debug("nf_ct_tcp: Invalid dir=%i index=%u ostate=%u\n", |
911 | dir, get_conntrack_index(th), old_state); | |
9fb9cbb1 | 912 | write_unlock_bh(&tcp_lock); |
c2a2c7e0 | 913 | if (LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 YK |
914 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
915 | "nf_ct_tcp: invalid state "); | |
916 | return -NF_ACCEPT; | |
9fb9cbb1 YK |
917 | case TCP_CONNTRACK_CLOSE: |
918 | if (index == TCP_RST_SET | |
c88130bc PM |
919 | && ((test_bit(IPS_SEEN_REPLY_BIT, &ct->status) |
920 | && ct->proto.tcp.last_index == TCP_SYN_SET) | |
921 | || (!test_bit(IPS_ASSURED_BIT, &ct->status) | |
922 | && ct->proto.tcp.last_index == TCP_ACK_SET)) | |
923 | && ntohl(th->ack_seq) == ct->proto.tcp.last_end) { | |
93b1fae4 | 924 | /* RST sent to invalid SYN or ACK we had let through |
73f30602 JK |
925 | * at a) and c) above: |
926 | * | |
927 | * a) SYN was in window then | |
928 | * c) we hold a half-open connection. | |
929 | * | |
930 | * Delete our connection entry. | |
9fb9cbb1 | 931 | * We skip window checking, because packet might ACK |
73f30602 | 932 | * segments we ignored. */ |
9fb9cbb1 YK |
933 | goto in_window; |
934 | } | |
93b1fae4 | 935 | /* Just fall through */ |
9fb9cbb1 YK |
936 | default: |
937 | /* Keep compilers happy. */ | |
938 | break; | |
939 | } | |
940 | ||
c88130bc | 941 | if (!tcp_in_window(ct, &ct->proto.tcp, dir, index, |
9fb9cbb1 YK |
942 | skb, dataoff, th, pf)) { |
943 | write_unlock_bh(&tcp_lock); | |
944 | return -NF_ACCEPT; | |
945 | } | |
946 | in_window: | |
947 | /* From now on we have got in-window packets */ | |
c88130bc PM |
948 | ct->proto.tcp.last_index = index; |
949 | ct->proto.tcp.last_dir = dir; | |
9fb9cbb1 | 950 | |
0d53778e | 951 | pr_debug("tcp_conntracks: "); |
3c9fba65 | 952 | nf_ct_dump_tuple(tuple); |
0d53778e PM |
953 | pr_debug("syn=%i ack=%i fin=%i rst=%i old=%i new=%i\n", |
954 | (th->syn ? 1 : 0), (th->ack ? 1 : 0), | |
955 | (th->fin ? 1 : 0), (th->rst ? 1 : 0), | |
956 | old_state, new_state); | |
9fb9cbb1 | 957 | |
c88130bc | 958 | ct->proto.tcp.state = new_state; |
9fb9cbb1 | 959 | if (old_state != new_state |
d0c1fd7a | 960 | && new_state == TCP_CONNTRACK_FIN_WAIT) |
c88130bc | 961 | ct->proto.tcp.seen[dir].flags |= IP_CT_TCP_FLAG_CLOSE_INIT; |
ae375044 PM |
962 | |
963 | if (ct->proto.tcp.retrans >= nf_ct_tcp_max_retrans && | |
964 | tcp_timeouts[new_state] > nf_ct_tcp_timeout_max_retrans) | |
965 | timeout = nf_ct_tcp_timeout_max_retrans; | |
966 | else if ((ct->proto.tcp.seen[0].flags | ct->proto.tcp.seen[1].flags) & | |
967 | IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED && | |
968 | tcp_timeouts[new_state] > nf_ct_tcp_timeout_unacknowledged) | |
969 | timeout = nf_ct_tcp_timeout_unacknowledged; | |
970 | else | |
971 | timeout = tcp_timeouts[new_state]; | |
9fb9cbb1 YK |
972 | write_unlock_bh(&tcp_lock); |
973 | ||
a71996fc | 974 | nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, ct); |
9fb9cbb1 | 975 | if (new_state != old_state) |
a71996fc | 976 | nf_conntrack_event_cache(IPCT_PROTOINFO, ct); |
9fb9cbb1 | 977 | |
c88130bc | 978 | if (!test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { |
9fb9cbb1 YK |
979 | /* If only reply is a RST, we can consider ourselves not to |
980 | have an established connection: this is a fairly common | |
981 | problem case, so we can delete the conntrack | |
982 | immediately. --RR */ | |
983 | if (th->rst) { | |
718d4ad9 | 984 | nf_ct_kill_acct(ct, ctinfo, skb); |
9fb9cbb1 YK |
985 | return NF_ACCEPT; |
986 | } | |
c88130bc | 987 | } else if (!test_bit(IPS_ASSURED_BIT, &ct->status) |
9fb9cbb1 YK |
988 | && (old_state == TCP_CONNTRACK_SYN_RECV |
989 | || old_state == TCP_CONNTRACK_ESTABLISHED) | |
990 | && new_state == TCP_CONNTRACK_ESTABLISHED) { | |
601e68e1 YH |
991 | /* Set ASSURED if we see see valid ack in ESTABLISHED |
992 | after SYN_RECV or a valid answer for a picked up | |
9fb9cbb1 | 993 | connection. */ |
c88130bc | 994 | set_bit(IPS_ASSURED_BIT, &ct->status); |
a71996fc | 995 | nf_conntrack_event_cache(IPCT_STATUS, ct); |
9fb9cbb1 | 996 | } |
c88130bc | 997 | nf_ct_refresh_acct(ct, ctinfo, skb, timeout); |
9fb9cbb1 YK |
998 | |
999 | return NF_ACCEPT; | |
1000 | } | |
601e68e1 | 1001 | |
9fb9cbb1 | 1002 | /* Called when a new connection for this protocol found. */ |
09f263cd JE |
1003 | static bool tcp_new(struct nf_conn *ct, const struct sk_buff *skb, |
1004 | unsigned int dataoff) | |
9fb9cbb1 YK |
1005 | { |
1006 | enum tcp_conntrack new_state; | |
82f568fc JE |
1007 | const struct tcphdr *th; |
1008 | struct tcphdr _tcph; | |
1009 | const struct ip_ct_tcp_state *sender = &ct->proto.tcp.seen[0]; | |
1010 | const struct ip_ct_tcp_state *receiver = &ct->proto.tcp.seen[1]; | |
9fb9cbb1 YK |
1011 | |
1012 | th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph); | |
1013 | BUG_ON(th == NULL); | |
1014 | ||
1015 | /* Don't need lock here: this conntrack not in circulation yet */ | |
1016 | new_state | |
1017 | = tcp_conntracks[0][get_conntrack_index(th)] | |
1018 | [TCP_CONNTRACK_NONE]; | |
1019 | ||
1020 | /* Invalid: delete conntrack */ | |
1021 | if (new_state >= TCP_CONNTRACK_MAX) { | |
0d53778e | 1022 | pr_debug("nf_ct_tcp: invalid new deleting.\n"); |
09f263cd | 1023 | return false; |
9fb9cbb1 YK |
1024 | } |
1025 | ||
1026 | if (new_state == TCP_CONNTRACK_SYN_SENT) { | |
1027 | /* SYN packet */ | |
c88130bc | 1028 | ct->proto.tcp.seen[0].td_end = |
9fb9cbb1 YK |
1029 | segment_seq_plus_len(ntohl(th->seq), skb->len, |
1030 | dataoff, th); | |
c88130bc PM |
1031 | ct->proto.tcp.seen[0].td_maxwin = ntohs(th->window); |
1032 | if (ct->proto.tcp.seen[0].td_maxwin == 0) | |
1033 | ct->proto.tcp.seen[0].td_maxwin = 1; | |
1034 | ct->proto.tcp.seen[0].td_maxend = | |
1035 | ct->proto.tcp.seen[0].td_end; | |
1036 | ||
1037 | tcp_options(skb, dataoff, th, &ct->proto.tcp.seen[0]); | |
1038 | ct->proto.tcp.seen[1].flags = 0; | |
9fb9cbb1 YK |
1039 | } else if (nf_ct_tcp_loose == 0) { |
1040 | /* Don't try to pick up connections. */ | |
09f263cd | 1041 | return false; |
9fb9cbb1 YK |
1042 | } else { |
1043 | /* | |
1044 | * We are in the middle of a connection, | |
1045 | * its history is lost for us. | |
1046 | * Let's try to use the data from the packet. | |
1047 | */ | |
c88130bc | 1048 | ct->proto.tcp.seen[0].td_end = |
9fb9cbb1 YK |
1049 | segment_seq_plus_len(ntohl(th->seq), skb->len, |
1050 | dataoff, th); | |
c88130bc PM |
1051 | ct->proto.tcp.seen[0].td_maxwin = ntohs(th->window); |
1052 | if (ct->proto.tcp.seen[0].td_maxwin == 0) | |
1053 | ct->proto.tcp.seen[0].td_maxwin = 1; | |
1054 | ct->proto.tcp.seen[0].td_maxend = | |
1055 | ct->proto.tcp.seen[0].td_end + | |
1056 | ct->proto.tcp.seen[0].td_maxwin; | |
1057 | ct->proto.tcp.seen[0].td_scale = 0; | |
9fb9cbb1 | 1058 | |
a09113c2 PM |
1059 | /* We assume SACK and liberal window checking to handle |
1060 | * window scaling */ | |
c88130bc PM |
1061 | ct->proto.tcp.seen[0].flags = |
1062 | ct->proto.tcp.seen[1].flags = IP_CT_TCP_FLAG_SACK_PERM | | |
1063 | IP_CT_TCP_FLAG_BE_LIBERAL; | |
9fb9cbb1 | 1064 | } |
601e68e1 | 1065 | |
c88130bc PM |
1066 | ct->proto.tcp.seen[1].td_end = 0; |
1067 | ct->proto.tcp.seen[1].td_maxend = 0; | |
1068 | ct->proto.tcp.seen[1].td_maxwin = 1; | |
1069 | ct->proto.tcp.seen[1].td_scale = 0; | |
9fb9cbb1 YK |
1070 | |
1071 | /* tcp_packet will set them */ | |
c88130bc PM |
1072 | ct->proto.tcp.state = TCP_CONNTRACK_NONE; |
1073 | ct->proto.tcp.last_index = TCP_NONE_SET; | |
601e68e1 | 1074 | |
0d53778e PM |
1075 | pr_debug("tcp_new: sender end=%u maxend=%u maxwin=%u scale=%i " |
1076 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", | |
1077 | sender->td_end, sender->td_maxend, sender->td_maxwin, | |
1078 | sender->td_scale, | |
1079 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, | |
1080 | receiver->td_scale); | |
09f263cd | 1081 | return true; |
9fb9cbb1 | 1082 | } |
c1d10adb | 1083 | |
e281db5c | 1084 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
c1d10adb PNA |
1085 | |
1086 | #include <linux/netfilter/nfnetlink.h> | |
1087 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
1088 | ||
fdf70832 | 1089 | static int tcp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, |
c1d10adb PNA |
1090 | const struct nf_conn *ct) |
1091 | { | |
df6fb868 | 1092 | struct nlattr *nest_parms; |
c8e2078c | 1093 | struct nf_ct_tcp_flags tmp = {}; |
601e68e1 | 1094 | |
c1d10adb | 1095 | read_lock_bh(&tcp_lock); |
df6fb868 PM |
1096 | nest_parms = nla_nest_start(skb, CTA_PROTOINFO_TCP | NLA_F_NESTED); |
1097 | if (!nest_parms) | |
1098 | goto nla_put_failure; | |
1099 | ||
77236b6e | 1100 | NLA_PUT_U8(skb, CTA_PROTOINFO_TCP_STATE, ct->proto.tcp.state); |
c8e2078c | 1101 | |
77236b6e PM |
1102 | NLA_PUT_U8(skb, CTA_PROTOINFO_TCP_WSCALE_ORIGINAL, |
1103 | ct->proto.tcp.seen[0].td_scale); | |
c8e2078c | 1104 | |
77236b6e PM |
1105 | NLA_PUT_U8(skb, CTA_PROTOINFO_TCP_WSCALE_REPLY, |
1106 | ct->proto.tcp.seen[1].td_scale); | |
c8e2078c PNA |
1107 | |
1108 | tmp.flags = ct->proto.tcp.seen[0].flags; | |
df6fb868 | 1109 | NLA_PUT(skb, CTA_PROTOINFO_TCP_FLAGS_ORIGINAL, |
c8e2078c PNA |
1110 | sizeof(struct nf_ct_tcp_flags), &tmp); |
1111 | ||
1112 | tmp.flags = ct->proto.tcp.seen[1].flags; | |
df6fb868 | 1113 | NLA_PUT(skb, CTA_PROTOINFO_TCP_FLAGS_REPLY, |
c8e2078c | 1114 | sizeof(struct nf_ct_tcp_flags), &tmp); |
c1d10adb PNA |
1115 | read_unlock_bh(&tcp_lock); |
1116 | ||
df6fb868 | 1117 | nla_nest_end(skb, nest_parms); |
c1d10adb PNA |
1118 | |
1119 | return 0; | |
1120 | ||
df6fb868 | 1121 | nla_put_failure: |
c1d10adb PNA |
1122 | read_unlock_bh(&tcp_lock); |
1123 | return -1; | |
1124 | } | |
1125 | ||
f73e924c PM |
1126 | static const struct nla_policy tcp_nla_policy[CTA_PROTOINFO_TCP_MAX+1] = { |
1127 | [CTA_PROTOINFO_TCP_STATE] = { .type = NLA_U8 }, | |
1128 | [CTA_PROTOINFO_TCP_WSCALE_ORIGINAL] = { .type = NLA_U8 }, | |
1129 | [CTA_PROTOINFO_TCP_WSCALE_REPLY] = { .type = NLA_U8 }, | |
1130 | [CTA_PROTOINFO_TCP_FLAGS_ORIGINAL] = { .len = sizeof(struct nf_ct_tcp_flags) }, | |
1131 | [CTA_PROTOINFO_TCP_FLAGS_REPLY] = { .len = sizeof(struct nf_ct_tcp_flags) }, | |
c1d10adb PNA |
1132 | }; |
1133 | ||
fdf70832 | 1134 | static int nlattr_to_tcp(struct nlattr *cda[], struct nf_conn *ct) |
c1d10adb | 1135 | { |
2f0d2f10 | 1136 | struct nlattr *pattr = cda[CTA_PROTOINFO_TCP]; |
df6fb868 | 1137 | struct nlattr *tb[CTA_PROTOINFO_TCP_MAX+1]; |
f73e924c | 1138 | int err; |
c1d10adb PNA |
1139 | |
1140 | /* updates could not contain anything about the private | |
1141 | * protocol info, in that case skip the parsing */ | |
2f0d2f10 | 1142 | if (!pattr) |
c1d10adb PNA |
1143 | return 0; |
1144 | ||
2f0d2f10 | 1145 | err = nla_parse_nested(tb, CTA_PROTOINFO_TCP_MAX, pattr, tcp_nla_policy); |
f73e924c PM |
1146 | if (err < 0) |
1147 | return err; | |
c1d10adb | 1148 | |
5f7da4d2 PM |
1149 | if (tb[CTA_PROTOINFO_TCP_STATE] && |
1150 | nla_get_u8(tb[CTA_PROTOINFO_TCP_STATE]) >= TCP_CONNTRACK_MAX) | |
c1d10adb PNA |
1151 | return -EINVAL; |
1152 | ||
1153 | write_lock_bh(&tcp_lock); | |
5f7da4d2 PM |
1154 | if (tb[CTA_PROTOINFO_TCP_STATE]) |
1155 | ct->proto.tcp.state = nla_get_u8(tb[CTA_PROTOINFO_TCP_STATE]); | |
c8e2078c | 1156 | |
df6fb868 | 1157 | if (tb[CTA_PROTOINFO_TCP_FLAGS_ORIGINAL]) { |
c8e2078c | 1158 | struct nf_ct_tcp_flags *attr = |
df6fb868 | 1159 | nla_data(tb[CTA_PROTOINFO_TCP_FLAGS_ORIGINAL]); |
c8e2078c PNA |
1160 | ct->proto.tcp.seen[0].flags &= ~attr->mask; |
1161 | ct->proto.tcp.seen[0].flags |= attr->flags & attr->mask; | |
1162 | } | |
1163 | ||
df6fb868 | 1164 | if (tb[CTA_PROTOINFO_TCP_FLAGS_REPLY]) { |
c8e2078c | 1165 | struct nf_ct_tcp_flags *attr = |
df6fb868 | 1166 | nla_data(tb[CTA_PROTOINFO_TCP_FLAGS_REPLY]); |
c8e2078c PNA |
1167 | ct->proto.tcp.seen[1].flags &= ~attr->mask; |
1168 | ct->proto.tcp.seen[1].flags |= attr->flags & attr->mask; | |
1169 | } | |
1170 | ||
df6fb868 PM |
1171 | if (tb[CTA_PROTOINFO_TCP_WSCALE_ORIGINAL] && |
1172 | tb[CTA_PROTOINFO_TCP_WSCALE_REPLY] && | |
c8e2078c PNA |
1173 | ct->proto.tcp.seen[0].flags & IP_CT_TCP_FLAG_WINDOW_SCALE && |
1174 | ct->proto.tcp.seen[1].flags & IP_CT_TCP_FLAG_WINDOW_SCALE) { | |
77236b6e PM |
1175 | ct->proto.tcp.seen[0].td_scale = |
1176 | nla_get_u8(tb[CTA_PROTOINFO_TCP_WSCALE_ORIGINAL]); | |
1177 | ct->proto.tcp.seen[1].td_scale = | |
1178 | nla_get_u8(tb[CTA_PROTOINFO_TCP_WSCALE_REPLY]); | |
c8e2078c | 1179 | } |
c1d10adb PNA |
1180 | write_unlock_bh(&tcp_lock); |
1181 | ||
1182 | return 0; | |
1183 | } | |
1184 | #endif | |
933a41e7 PM |
1185 | |
1186 | #ifdef CONFIG_SYSCTL | |
1187 | static unsigned int tcp_sysctl_table_users; | |
1188 | static struct ctl_table_header *tcp_sysctl_header; | |
1189 | static struct ctl_table tcp_sysctl_table[] = { | |
1190 | { | |
933a41e7 | 1191 | .procname = "nf_conntrack_tcp_timeout_syn_sent", |
2d646286 | 1192 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_SENT], |
933a41e7 PM |
1193 | .maxlen = sizeof(unsigned int), |
1194 | .mode = 0644, | |
6d9f239a | 1195 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1196 | }, |
1197 | { | |
933a41e7 | 1198 | .procname = "nf_conntrack_tcp_timeout_syn_recv", |
2d646286 | 1199 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_RECV], |
933a41e7 PM |
1200 | .maxlen = sizeof(unsigned int), |
1201 | .mode = 0644, | |
6d9f239a | 1202 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1203 | }, |
1204 | { | |
933a41e7 | 1205 | .procname = "nf_conntrack_tcp_timeout_established", |
2d646286 | 1206 | .data = &tcp_timeouts[TCP_CONNTRACK_ESTABLISHED], |
933a41e7 PM |
1207 | .maxlen = sizeof(unsigned int), |
1208 | .mode = 0644, | |
6d9f239a | 1209 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1210 | }, |
1211 | { | |
933a41e7 | 1212 | .procname = "nf_conntrack_tcp_timeout_fin_wait", |
2d646286 | 1213 | .data = &tcp_timeouts[TCP_CONNTRACK_FIN_WAIT], |
933a41e7 PM |
1214 | .maxlen = sizeof(unsigned int), |
1215 | .mode = 0644, | |
6d9f239a | 1216 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1217 | }, |
1218 | { | |
933a41e7 | 1219 | .procname = "nf_conntrack_tcp_timeout_close_wait", |
2d646286 | 1220 | .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE_WAIT], |
933a41e7 PM |
1221 | .maxlen = sizeof(unsigned int), |
1222 | .mode = 0644, | |
6d9f239a | 1223 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1224 | }, |
1225 | { | |
933a41e7 | 1226 | .procname = "nf_conntrack_tcp_timeout_last_ack", |
2d646286 | 1227 | .data = &tcp_timeouts[TCP_CONNTRACK_LAST_ACK], |
933a41e7 PM |
1228 | .maxlen = sizeof(unsigned int), |
1229 | .mode = 0644, | |
6d9f239a | 1230 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1231 | }, |
1232 | { | |
933a41e7 | 1233 | .procname = "nf_conntrack_tcp_timeout_time_wait", |
2d646286 | 1234 | .data = &tcp_timeouts[TCP_CONNTRACK_TIME_WAIT], |
933a41e7 PM |
1235 | .maxlen = sizeof(unsigned int), |
1236 | .mode = 0644, | |
6d9f239a | 1237 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1238 | }, |
1239 | { | |
933a41e7 | 1240 | .procname = "nf_conntrack_tcp_timeout_close", |
2d646286 | 1241 | .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE], |
933a41e7 PM |
1242 | .maxlen = sizeof(unsigned int), |
1243 | .mode = 0644, | |
6d9f239a | 1244 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1245 | }, |
1246 | { | |
933a41e7 PM |
1247 | .procname = "nf_conntrack_tcp_timeout_max_retrans", |
1248 | .data = &nf_ct_tcp_timeout_max_retrans, | |
1249 | .maxlen = sizeof(unsigned int), | |
1250 | .mode = 0644, | |
6d9f239a | 1251 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 | 1252 | }, |
ae375044 PM |
1253 | { |
1254 | .procname = "nf_conntrack_tcp_timeout_unacknowledged", | |
1255 | .data = &nf_ct_tcp_timeout_unacknowledged, | |
1256 | .maxlen = sizeof(unsigned int), | |
1257 | .mode = 0644, | |
6d9f239a | 1258 | .proc_handler = proc_dointvec_jiffies, |
ae375044 | 1259 | }, |
933a41e7 PM |
1260 | { |
1261 | .ctl_name = NET_NF_CONNTRACK_TCP_LOOSE, | |
1262 | .procname = "nf_conntrack_tcp_loose", | |
1263 | .data = &nf_ct_tcp_loose, | |
1264 | .maxlen = sizeof(unsigned int), | |
1265 | .mode = 0644, | |
6d9f239a | 1266 | .proc_handler = proc_dointvec, |
933a41e7 PM |
1267 | }, |
1268 | { | |
1269 | .ctl_name = NET_NF_CONNTRACK_TCP_BE_LIBERAL, | |
1270 | .procname = "nf_conntrack_tcp_be_liberal", | |
1271 | .data = &nf_ct_tcp_be_liberal, | |
1272 | .maxlen = sizeof(unsigned int), | |
1273 | .mode = 0644, | |
6d9f239a | 1274 | .proc_handler = proc_dointvec, |
933a41e7 PM |
1275 | }, |
1276 | { | |
1277 | .ctl_name = NET_NF_CONNTRACK_TCP_MAX_RETRANS, | |
1278 | .procname = "nf_conntrack_tcp_max_retrans", | |
1279 | .data = &nf_ct_tcp_max_retrans, | |
1280 | .maxlen = sizeof(unsigned int), | |
1281 | .mode = 0644, | |
6d9f239a | 1282 | .proc_handler = proc_dointvec, |
933a41e7 PM |
1283 | }, |
1284 | { | |
1285 | .ctl_name = 0 | |
1286 | } | |
1287 | }; | |
a999e683 PM |
1288 | |
1289 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT | |
1290 | static struct ctl_table tcp_compat_sysctl_table[] = { | |
1291 | { | |
a999e683 | 1292 | .procname = "ip_conntrack_tcp_timeout_syn_sent", |
2d646286 | 1293 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_SENT], |
a999e683 PM |
1294 | .maxlen = sizeof(unsigned int), |
1295 | .mode = 0644, | |
6d9f239a | 1296 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1297 | }, |
1298 | { | |
a999e683 | 1299 | .procname = "ip_conntrack_tcp_timeout_syn_recv", |
2d646286 | 1300 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_RECV], |
a999e683 PM |
1301 | .maxlen = sizeof(unsigned int), |
1302 | .mode = 0644, | |
6d9f239a | 1303 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1304 | }, |
1305 | { | |
a999e683 | 1306 | .procname = "ip_conntrack_tcp_timeout_established", |
2d646286 | 1307 | .data = &tcp_timeouts[TCP_CONNTRACK_ESTABLISHED], |
a999e683 PM |
1308 | .maxlen = sizeof(unsigned int), |
1309 | .mode = 0644, | |
6d9f239a | 1310 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1311 | }, |
1312 | { | |
a999e683 | 1313 | .procname = "ip_conntrack_tcp_timeout_fin_wait", |
2d646286 | 1314 | .data = &tcp_timeouts[TCP_CONNTRACK_FIN_WAIT], |
a999e683 PM |
1315 | .maxlen = sizeof(unsigned int), |
1316 | .mode = 0644, | |
6d9f239a | 1317 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1318 | }, |
1319 | { | |
a999e683 | 1320 | .procname = "ip_conntrack_tcp_timeout_close_wait", |
2d646286 | 1321 | .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE_WAIT], |
a999e683 PM |
1322 | .maxlen = sizeof(unsigned int), |
1323 | .mode = 0644, | |
6d9f239a | 1324 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1325 | }, |
1326 | { | |
a999e683 | 1327 | .procname = "ip_conntrack_tcp_timeout_last_ack", |
2d646286 | 1328 | .data = &tcp_timeouts[TCP_CONNTRACK_LAST_ACK], |
a999e683 PM |
1329 | .maxlen = sizeof(unsigned int), |
1330 | .mode = 0644, | |
6d9f239a | 1331 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1332 | }, |
1333 | { | |
a999e683 | 1334 | .procname = "ip_conntrack_tcp_timeout_time_wait", |
2d646286 | 1335 | .data = &tcp_timeouts[TCP_CONNTRACK_TIME_WAIT], |
a999e683 PM |
1336 | .maxlen = sizeof(unsigned int), |
1337 | .mode = 0644, | |
6d9f239a | 1338 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1339 | }, |
1340 | { | |
a999e683 | 1341 | .procname = "ip_conntrack_tcp_timeout_close", |
2d646286 | 1342 | .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE], |
a999e683 PM |
1343 | .maxlen = sizeof(unsigned int), |
1344 | .mode = 0644, | |
6d9f239a | 1345 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1346 | }, |
1347 | { | |
a999e683 PM |
1348 | .procname = "ip_conntrack_tcp_timeout_max_retrans", |
1349 | .data = &nf_ct_tcp_timeout_max_retrans, | |
1350 | .maxlen = sizeof(unsigned int), | |
1351 | .mode = 0644, | |
6d9f239a | 1352 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1353 | }, |
1354 | { | |
1355 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_LOOSE, | |
1356 | .procname = "ip_conntrack_tcp_loose", | |
1357 | .data = &nf_ct_tcp_loose, | |
1358 | .maxlen = sizeof(unsigned int), | |
1359 | .mode = 0644, | |
6d9f239a | 1360 | .proc_handler = proc_dointvec, |
a999e683 PM |
1361 | }, |
1362 | { | |
1363 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL, | |
1364 | .procname = "ip_conntrack_tcp_be_liberal", | |
1365 | .data = &nf_ct_tcp_be_liberal, | |
1366 | .maxlen = sizeof(unsigned int), | |
1367 | .mode = 0644, | |
6d9f239a | 1368 | .proc_handler = proc_dointvec, |
a999e683 PM |
1369 | }, |
1370 | { | |
1371 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS, | |
1372 | .procname = "ip_conntrack_tcp_max_retrans", | |
1373 | .data = &nf_ct_tcp_max_retrans, | |
1374 | .maxlen = sizeof(unsigned int), | |
1375 | .mode = 0644, | |
6d9f239a | 1376 | .proc_handler = proc_dointvec, |
a999e683 PM |
1377 | }, |
1378 | { | |
1379 | .ctl_name = 0 | |
1380 | } | |
1381 | }; | |
1382 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ | |
933a41e7 PM |
1383 | #endif /* CONFIG_SYSCTL */ |
1384 | ||
61075af5 | 1385 | struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4 __read_mostly = |
9fb9cbb1 YK |
1386 | { |
1387 | .l3proto = PF_INET, | |
605dcad6 | 1388 | .l4proto = IPPROTO_TCP, |
9fb9cbb1 YK |
1389 | .name = "tcp", |
1390 | .pkt_to_tuple = tcp_pkt_to_tuple, | |
1391 | .invert_tuple = tcp_invert_tuple, | |
1392 | .print_tuple = tcp_print_tuple, | |
1393 | .print_conntrack = tcp_print_conntrack, | |
1394 | .packet = tcp_packet, | |
1395 | .new = tcp_new, | |
96f6bf82 | 1396 | .error = tcp_error, |
e281db5c | 1397 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
fdf70832 PM |
1398 | .to_nlattr = tcp_to_nlattr, |
1399 | .from_nlattr = nlattr_to_tcp, | |
1400 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, | |
1401 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, | |
f73e924c | 1402 | .nla_policy = nf_ct_port_nla_policy, |
c1d10adb | 1403 | #endif |
933a41e7 PM |
1404 | #ifdef CONFIG_SYSCTL |
1405 | .ctl_table_users = &tcp_sysctl_table_users, | |
1406 | .ctl_table_header = &tcp_sysctl_header, | |
1407 | .ctl_table = tcp_sysctl_table, | |
a999e683 PM |
1408 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
1409 | .ctl_compat_table = tcp_compat_sysctl_table, | |
1410 | #endif | |
933a41e7 | 1411 | #endif |
9fb9cbb1 | 1412 | }; |
13b18339 | 1413 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp4); |
9fb9cbb1 | 1414 | |
61075af5 | 1415 | struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6 __read_mostly = |
9fb9cbb1 YK |
1416 | { |
1417 | .l3proto = PF_INET6, | |
605dcad6 | 1418 | .l4proto = IPPROTO_TCP, |
9fb9cbb1 YK |
1419 | .name = "tcp", |
1420 | .pkt_to_tuple = tcp_pkt_to_tuple, | |
1421 | .invert_tuple = tcp_invert_tuple, | |
1422 | .print_tuple = tcp_print_tuple, | |
1423 | .print_conntrack = tcp_print_conntrack, | |
1424 | .packet = tcp_packet, | |
1425 | .new = tcp_new, | |
96f6bf82 | 1426 | .error = tcp_error, |
e281db5c | 1427 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
fdf70832 PM |
1428 | .to_nlattr = tcp_to_nlattr, |
1429 | .from_nlattr = nlattr_to_tcp, | |
1430 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, | |
1431 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, | |
f73e924c | 1432 | .nla_policy = nf_ct_port_nla_policy, |
c1d10adb | 1433 | #endif |
933a41e7 PM |
1434 | #ifdef CONFIG_SYSCTL |
1435 | .ctl_table_users = &tcp_sysctl_table_users, | |
1436 | .ctl_table_header = &tcp_sysctl_header, | |
1437 | .ctl_table = tcp_sysctl_table, | |
1438 | #endif | |
9fb9cbb1 | 1439 | }; |
13b18339 | 1440 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp6); |