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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. */ |
933a41e7 | 70 | static unsigned int nf_ct_tcp_timeout_max_retrans __read_mostly = 5 MINS; |
601e68e1 | 71 | |
2d646286 PM |
72 | static unsigned int tcp_timeouts[TCP_CONNTRACK_MAX] __read_mostly = { |
73 | [TCP_CONNTRACK_SYN_SENT] = 2 MINS, | |
74 | [TCP_CONNTRACK_SYN_RECV] = 60 SECS, | |
75 | [TCP_CONNTRACK_ESTABLISHED] = 5 DAYS, | |
76 | [TCP_CONNTRACK_FIN_WAIT] = 2 MINS, | |
77 | [TCP_CONNTRACK_CLOSE_WAIT] = 60 SECS, | |
78 | [TCP_CONNTRACK_LAST_ACK] = 30 SECS, | |
79 | [TCP_CONNTRACK_TIME_WAIT] = 2 MINS, | |
80 | [TCP_CONNTRACK_CLOSE] = 10 SECS, | |
81 | }; | |
601e68e1 | 82 | |
9fb9cbb1 YK |
83 | #define sNO TCP_CONNTRACK_NONE |
84 | #define sSS TCP_CONNTRACK_SYN_SENT | |
85 | #define sSR TCP_CONNTRACK_SYN_RECV | |
86 | #define sES TCP_CONNTRACK_ESTABLISHED | |
87 | #define sFW TCP_CONNTRACK_FIN_WAIT | |
88 | #define sCW TCP_CONNTRACK_CLOSE_WAIT | |
89 | #define sLA TCP_CONNTRACK_LAST_ACK | |
90 | #define sTW TCP_CONNTRACK_TIME_WAIT | |
91 | #define sCL TCP_CONNTRACK_CLOSE | |
92 | #define sLI TCP_CONNTRACK_LISTEN | |
93 | #define sIV TCP_CONNTRACK_MAX | |
94 | #define sIG TCP_CONNTRACK_IGNORE | |
95 | ||
96 | /* What TCP flags are set from RST/SYN/FIN/ACK. */ | |
97 | enum tcp_bit_set { | |
98 | TCP_SYN_SET, | |
99 | TCP_SYNACK_SET, | |
100 | TCP_FIN_SET, | |
101 | TCP_ACK_SET, | |
102 | TCP_RST_SET, | |
103 | TCP_NONE_SET, | |
104 | }; | |
601e68e1 | 105 | |
9fb9cbb1 YK |
106 | /* |
107 | * The TCP state transition table needs a few words... | |
108 | * | |
109 | * We are the man in the middle. All the packets go through us | |
110 | * but might get lost in transit to the destination. | |
601e68e1 | 111 | * It is assumed that the destinations can't receive segments |
9fb9cbb1 YK |
112 | * we haven't seen. |
113 | * | |
114 | * The checked segment is in window, but our windows are *not* | |
115 | * equivalent with the ones of the sender/receiver. We always | |
116 | * try to guess the state of the current sender. | |
117 | * | |
118 | * The meaning of the states are: | |
119 | * | |
120 | * NONE: initial state | |
601e68e1 | 121 | * SYN_SENT: SYN-only packet seen |
9fb9cbb1 YK |
122 | * SYN_RECV: SYN-ACK packet seen |
123 | * ESTABLISHED: ACK packet seen | |
124 | * FIN_WAIT: FIN packet seen | |
601e68e1 | 125 | * CLOSE_WAIT: ACK seen (after FIN) |
9fb9cbb1 YK |
126 | * LAST_ACK: FIN seen (after FIN) |
127 | * TIME_WAIT: last ACK seen | |
128 | * CLOSE: closed connection | |
129 | * | |
130 | * LISTEN state is not used. | |
131 | * | |
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): | |
138 | * if they are invalid | |
139 | * or we do not support the request (simultaneous open) | |
140 | */ | |
a5e73c29 | 141 | static const u8 tcp_conntracks[2][6][TCP_CONNTRACK_MAX] = { |
9fb9cbb1 YK |
142 | { |
143 | /* ORIGINAL */ | |
144 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
145 | /*syn*/ { sSS, sSS, sIG, sIG, sIG, sIG, sIG, sSS, sSS, sIV }, | |
146 | /* | |
147 | * sNO -> sSS Initialize a new connection | |
148 | * sSS -> sSS Retransmitted SYN | |
149 | * sSR -> sIG Late retransmitted SYN? | |
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 | */ | |
160 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
161 | /*synack*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV }, | |
162 | /* | |
163 | * A SYN/ACK from the client is always invalid: | |
601e68e1 | 164 | * - either it tries to set up a simultaneous open, which is |
9fb9cbb1 YK |
165 | * not supported; |
166 | * - or the firewall has just been inserted between the two hosts | |
601e68e1 | 167 | * during the session set-up. The SYN will be retransmitted |
9fb9cbb1 YK |
168 | * by the true client (or it'll time out). |
169 | */ | |
170 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
171 | /*fin*/ { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV }, | |
172 | /* | |
173 | * sNO -> sIV Too late and no reason to do anything... | |
174 | * sSS -> sIV Client migth not send FIN in this state: | |
175 | * we enforce waiting for a SYN/ACK reply first. | |
176 | * sSR -> sFW Close started. | |
177 | * sES -> sFW | |
178 | * sFW -> sLA FIN seen in both directions, waiting for | |
601e68e1 | 179 | * the last ACK. |
9fb9cbb1 YK |
180 | * Migth be a retransmitted FIN as well... |
181 | * sCW -> sLA | |
182 | * sLA -> sLA Retransmitted FIN. Remain in the same state. | |
183 | * sTW -> sTW | |
184 | * sCL -> sCL | |
185 | */ | |
186 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
187 | /*ack*/ { sES, sIV, sES, sES, sCW, sCW, sTW, sTW, sCL, sIV }, | |
188 | /* | |
189 | * sNO -> sES Assumed. | |
190 | * sSS -> sIV ACK is invalid: we haven't seen a SYN/ACK yet. | |
191 | * sSR -> sES Established state is reached. | |
192 | * sES -> sES :-) | |
193 | * sFW -> sCW Normal close request answered by ACK. | |
194 | * sCW -> sCW | |
195 | * sLA -> sTW Last ACK detected. | |
196 | * sTW -> sTW Retransmitted last ACK. Remain in the same state. | |
197 | * sCL -> sCL | |
198 | */ | |
199 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
200 | /*rst*/ { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV }, | |
201 | /*none*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV } | |
202 | }, | |
203 | { | |
204 | /* REPLY */ | |
205 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
206 | /*syn*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV }, | |
207 | /* | |
208 | * sNO -> sIV Never reached. | |
209 | * sSS -> sIV Simultaneous open, not supported | |
210 | * sSR -> sIV Simultaneous open, not supported. | |
211 | * sES -> sIV Server may not initiate a connection. | |
212 | * sFW -> sIV | |
213 | * sCW -> sIV | |
214 | * sLA -> sIV | |
215 | * sTW -> sIV Reopened connection, but server may not do it. | |
216 | * sCL -> sIV | |
217 | */ | |
218 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
219 | /*synack*/ { sIV, sSR, sSR, sIG, sIG, sIG, sIG, sIG, sIG, sIV }, | |
220 | /* | |
221 | * sSS -> sSR Standard open. | |
222 | * sSR -> sSR Retransmitted SYN/ACK. | |
223 | * sES -> sIG Late retransmitted SYN/ACK? | |
224 | * sFW -> sIG Might be SYN/ACK answering ignored SYN | |
225 | * sCW -> sIG | |
226 | * sLA -> sIG | |
227 | * sTW -> sIG | |
228 | * sCL -> sIG | |
229 | */ | |
230 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
231 | /*fin*/ { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV }, | |
232 | /* | |
233 | * sSS -> sIV Server might not send FIN in this state. | |
234 | * sSR -> sFW Close started. | |
235 | * sES -> sFW | |
236 | * sFW -> sLA FIN seen in both directions. | |
237 | * sCW -> sLA | |
238 | * sLA -> sLA Retransmitted FIN. | |
239 | * sTW -> sTW | |
240 | * sCL -> sCL | |
241 | */ | |
242 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
73f30602 | 243 | /*ack*/ { sIV, sIG, sSR, sES, sCW, sCW, sTW, sTW, sCL, sIV }, |
9fb9cbb1 | 244 | /* |
73f30602 | 245 | * sSS -> sIG Might be a half-open connection. |
9fb9cbb1 YK |
246 | * sSR -> sSR Might answer late resent SYN. |
247 | * sES -> sES :-) | |
248 | * sFW -> sCW Normal close request answered by ACK. | |
249 | * sCW -> sCW | |
250 | * sLA -> sTW Last ACK detected. | |
251 | * sTW -> sTW Retransmitted last ACK. | |
252 | * sCL -> sCL | |
253 | */ | |
254 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
255 | /*rst*/ { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV }, | |
256 | /*none*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV } | |
601e68e1 | 257 | } |
9fb9cbb1 YK |
258 | }; |
259 | ||
260 | static int tcp_pkt_to_tuple(const struct sk_buff *skb, | |
261 | unsigned int dataoff, | |
262 | struct nf_conntrack_tuple *tuple) | |
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) | |
270 | return 0; | |
271 | ||
272 | tuple->src.u.tcp.port = hp->source; | |
273 | tuple->dst.u.tcp.port = hp->dest; | |
274 | ||
275 | return 1; | |
276 | } | |
277 | ||
278 | static int tcp_invert_tuple(struct nf_conntrack_tuple *tuple, | |
279 | const struct nf_conntrack_tuple *orig) | |
280 | { | |
281 | tuple->src.u.tcp.port = orig->dst.u.tcp.port; | |
282 | tuple->dst.u.tcp.port = orig->src.u.tcp.port; | |
283 | return 1; | |
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 | |
335 | III. Upper bound for valid ack: sack <= receiver.td_end | |
336 | IV. Lower bound for valid ack: ack >= receiver.td_end - MAXACKWINDOW | |
337 | ||
338 | where sack is the highest right edge of sack block found in the packet. | |
339 | ||
601e68e1 YH |
340 | The upper bound limit for a valid ack is not ignored - |
341 | we doesn't have to deal with fragments. | |
9fb9cbb1 YK |
342 | */ |
343 | ||
344 | static inline __u32 segment_seq_plus_len(__u32 seq, | |
345 | size_t len, | |
346 | unsigned int dataoff, | |
82f568fc | 347 | const struct tcphdr *tcph) |
9fb9cbb1 YK |
348 | { |
349 | /* XXX Should I use payload length field in IP/IPv6 header ? | |
350 | * - YK */ | |
351 | return (seq + len - dataoff - tcph->doff*4 | |
352 | + (tcph->syn ? 1 : 0) + (tcph->fin ? 1 : 0)); | |
353 | } | |
601e68e1 | 354 | |
9fb9cbb1 YK |
355 | /* Fixme: what about big packets? */ |
356 | #define MAXACKWINCONST 66000 | |
357 | #define MAXACKWINDOW(sender) \ | |
358 | ((sender)->td_maxwin > MAXACKWINCONST ? (sender)->td_maxwin \ | |
359 | : MAXACKWINCONST) | |
601e68e1 | 360 | |
9fb9cbb1 YK |
361 | /* |
362 | * Simplified tcp_parse_options routine from tcp_input.c | |
363 | */ | |
364 | static void tcp_options(const struct sk_buff *skb, | |
365 | unsigned int dataoff, | |
82f568fc | 366 | const struct tcphdr *tcph, |
9fb9cbb1 YK |
367 | struct ip_ct_tcp_state *state) |
368 | { | |
369 | unsigned char buff[(15 * 4) - sizeof(struct tcphdr)]; | |
82f568fc | 370 | const unsigned char *ptr; |
9fb9cbb1 YK |
371 | int length = (tcph->doff*4) - sizeof(struct tcphdr); |
372 | ||
373 | if (!length) | |
374 | return; | |
375 | ||
376 | ptr = skb_header_pointer(skb, dataoff + sizeof(struct tcphdr), | |
377 | length, buff); | |
378 | BUG_ON(ptr == NULL); | |
379 | ||
601e68e1 | 380 | state->td_scale = |
9fb9cbb1 YK |
381 | state->flags = 0; |
382 | ||
383 | while (length > 0) { | |
384 | int opcode=*ptr++; | |
385 | int opsize; | |
386 | ||
387 | switch (opcode) { | |
388 | case TCPOPT_EOL: | |
389 | return; | |
390 | case TCPOPT_NOP: /* Ref: RFC 793 section 3.1 */ | |
391 | length--; | |
392 | continue; | |
393 | default: | |
394 | opsize=*ptr++; | |
395 | if (opsize < 2) /* "silly options" */ | |
396 | return; | |
397 | if (opsize > length) | |
398 | break; /* don't parse partial options */ | |
399 | ||
601e68e1 | 400 | if (opcode == TCPOPT_SACK_PERM |
9fb9cbb1 YK |
401 | && opsize == TCPOLEN_SACK_PERM) |
402 | state->flags |= IP_CT_TCP_FLAG_SACK_PERM; | |
403 | else if (opcode == TCPOPT_WINDOW | |
404 | && opsize == TCPOLEN_WINDOW) { | |
405 | state->td_scale = *(u_int8_t *)ptr; | |
406 | ||
407 | if (state->td_scale > 14) { | |
408 | /* See RFC1323 */ | |
409 | state->td_scale = 14; | |
410 | } | |
411 | state->flags |= | |
412 | IP_CT_TCP_FLAG_WINDOW_SCALE; | |
413 | } | |
414 | ptr += opsize - 2; | |
415 | length -= opsize; | |
416 | } | |
417 | } | |
418 | } | |
419 | ||
420 | static void tcp_sack(const struct sk_buff *skb, unsigned int dataoff, | |
82f568fc | 421 | const struct tcphdr *tcph, __u32 *sack) |
9fb9cbb1 | 422 | { |
601e68e1 | 423 | unsigned char buff[(15 * 4) - sizeof(struct tcphdr)]; |
82f568fc | 424 | const unsigned char *ptr; |
9fb9cbb1 YK |
425 | int length = (tcph->doff*4) - sizeof(struct tcphdr); |
426 | __u32 tmp; | |
427 | ||
428 | if (!length) | |
429 | return; | |
430 | ||
431 | ptr = skb_header_pointer(skb, dataoff + sizeof(struct tcphdr), | |
432 | length, buff); | |
433 | BUG_ON(ptr == NULL); | |
434 | ||
435 | /* Fast path for timestamp-only option */ | |
436 | if (length == TCPOLEN_TSTAMP_ALIGNED*4 | |
8f05ce91 YH |
437 | && *(__be32 *)ptr == htonl((TCPOPT_NOP << 24) |
438 | | (TCPOPT_NOP << 16) | |
439 | | (TCPOPT_TIMESTAMP << 8) | |
440 | | TCPOLEN_TIMESTAMP)) | |
9fb9cbb1 YK |
441 | return; |
442 | ||
443 | while (length > 0) { | |
444 | int opcode = *ptr++; | |
445 | int opsize, i; | |
446 | ||
447 | switch (opcode) { | |
448 | case TCPOPT_EOL: | |
449 | return; | |
450 | case TCPOPT_NOP: /* Ref: RFC 793 section 3.1 */ | |
451 | length--; | |
452 | continue; | |
453 | default: | |
454 | opsize = *ptr++; | |
455 | if (opsize < 2) /* "silly options" */ | |
456 | return; | |
457 | if (opsize > length) | |
458 | break; /* don't parse partial options */ | |
459 | ||
601e68e1 YH |
460 | if (opcode == TCPOPT_SACK |
461 | && opsize >= (TCPOLEN_SACK_BASE | |
462 | + TCPOLEN_SACK_PERBLOCK) | |
463 | && !((opsize - TCPOLEN_SACK_BASE) | |
464 | % TCPOLEN_SACK_PERBLOCK)) { | |
465 | for (i = 0; | |
466 | i < (opsize - TCPOLEN_SACK_BASE); | |
467 | i += TCPOLEN_SACK_PERBLOCK) { | |
468 | tmp = ntohl(*((__be32 *)(ptr+i)+1)); | |
9fb9cbb1 YK |
469 | |
470 | if (after(tmp, *sack)) | |
471 | *sack = tmp; | |
472 | } | |
473 | return; | |
474 | } | |
475 | ptr += opsize - 2; | |
476 | length -= opsize; | |
477 | } | |
478 | } | |
479 | } | |
480 | ||
82f568fc | 481 | static int tcp_in_window(const struct nf_conn *ct, |
0d53778e | 482 | struct ip_ct_tcp *state, |
601e68e1 YH |
483 | enum ip_conntrack_dir dir, |
484 | unsigned int index, | |
485 | const struct sk_buff *skb, | |
9fb9cbb1 | 486 | unsigned int dataoff, |
82f568fc | 487 | const struct tcphdr *tcph, |
9fb9cbb1 YK |
488 | int pf) |
489 | { | |
490 | struct ip_ct_tcp_state *sender = &state->seen[dir]; | |
491 | struct ip_ct_tcp_state *receiver = &state->seen[!dir]; | |
82f568fc | 492 | const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple; |
9fb9cbb1 YK |
493 | __u32 seq, ack, sack, end, win, swin; |
494 | int res; | |
495 | ||
496 | /* | |
497 | * Get the required data from the packet. | |
498 | */ | |
499 | seq = ntohl(tcph->seq); | |
500 | ack = sack = ntohl(tcph->ack_seq); | |
501 | win = ntohs(tcph->window); | |
502 | end = segment_seq_plus_len(seq, skb->len, dataoff, tcph); | |
503 | ||
504 | if (receiver->flags & IP_CT_TCP_FLAG_SACK_PERM) | |
505 | tcp_sack(skb, dataoff, tcph, &sack); | |
506 | ||
0d53778e PM |
507 | pr_debug("tcp_in_window: START\n"); |
508 | pr_debug("tcp_in_window: "); | |
509 | NF_CT_DUMP_TUPLE(tuple); | |
510 | pr_debug("seq=%u ack=%u sack=%u win=%u end=%u\n", | |
511 | seq, ack, sack, win, end); | |
512 | pr_debug("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i " | |
513 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", | |
514 | sender->td_end, sender->td_maxend, sender->td_maxwin, | |
515 | sender->td_scale, | |
516 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, | |
517 | receiver->td_scale); | |
9fb9cbb1 YK |
518 | |
519 | if (sender->td_end == 0) { | |
520 | /* | |
521 | * Initialize sender data. | |
522 | */ | |
523 | if (tcph->syn && tcph->ack) { | |
524 | /* | |
525 | * Outgoing SYN-ACK in reply to a SYN. | |
526 | */ | |
601e68e1 | 527 | sender->td_end = |
9fb9cbb1 YK |
528 | sender->td_maxend = end; |
529 | sender->td_maxwin = (win == 0 ? 1 : win); | |
530 | ||
531 | tcp_options(skb, dataoff, tcph, sender); | |
601e68e1 | 532 | /* |
9fb9cbb1 YK |
533 | * RFC 1323: |
534 | * Both sides must send the Window Scale option | |
535 | * to enable window scaling in either direction. | |
536 | */ | |
537 | if (!(sender->flags & IP_CT_TCP_FLAG_WINDOW_SCALE | |
538 | && receiver->flags & IP_CT_TCP_FLAG_WINDOW_SCALE)) | |
601e68e1 | 539 | sender->td_scale = |
9fb9cbb1 YK |
540 | receiver->td_scale = 0; |
541 | } else { | |
542 | /* | |
543 | * We are in the middle of a connection, | |
544 | * its history is lost for us. | |
545 | * Let's try to use the data from the packet. | |
601e68e1 | 546 | */ |
9fb9cbb1 YK |
547 | sender->td_end = end; |
548 | sender->td_maxwin = (win == 0 ? 1 : win); | |
549 | sender->td_maxend = end + sender->td_maxwin; | |
550 | } | |
551 | } else if (((state->state == TCP_CONNTRACK_SYN_SENT | |
552 | && dir == IP_CT_DIR_ORIGINAL) | |
553 | || (state->state == TCP_CONNTRACK_SYN_RECV | |
554 | && dir == IP_CT_DIR_REPLY)) | |
555 | && after(end, sender->td_end)) { | |
556 | /* | |
557 | * RFC 793: "if a TCP is reinitialized ... then it need | |
601e68e1 | 558 | * not wait at all; it must only be sure to use sequence |
9fb9cbb1 YK |
559 | * numbers larger than those recently used." |
560 | */ | |
561 | sender->td_end = | |
562 | sender->td_maxend = end; | |
563 | sender->td_maxwin = (win == 0 ? 1 : win); | |
564 | ||
565 | tcp_options(skb, dataoff, tcph, sender); | |
566 | } | |
567 | ||
568 | if (!(tcph->ack)) { | |
569 | /* | |
570 | * If there is no ACK, just pretend it was set and OK. | |
571 | */ | |
572 | ack = sack = receiver->td_end; | |
601e68e1 YH |
573 | } else if (((tcp_flag_word(tcph) & (TCP_FLAG_ACK|TCP_FLAG_RST)) == |
574 | (TCP_FLAG_ACK|TCP_FLAG_RST)) | |
9fb9cbb1 YK |
575 | && (ack == 0)) { |
576 | /* | |
577 | * Broken TCP stacks, that set ACK in RST packets as well | |
578 | * with zero ack value. | |
579 | */ | |
580 | ack = sack = receiver->td_end; | |
581 | } | |
582 | ||
583 | if (seq == end | |
584 | && (!tcph->rst | |
585 | || (seq == 0 && state->state == TCP_CONNTRACK_SYN_SENT))) | |
586 | /* | |
587 | * Packets contains no data: we assume it is valid | |
588 | * and check the ack value only. | |
589 | * However RST segments are always validated by their | |
590 | * SEQ number, except when seq == 0 (reset sent answering | |
591 | * SYN. | |
592 | */ | |
593 | seq = end = sender->td_end; | |
594 | ||
0d53778e PM |
595 | pr_debug("tcp_in_window: "); |
596 | NF_CT_DUMP_TUPLE(tuple); | |
597 | pr_debug("seq=%u ack=%u sack =%u win=%u end=%u\n", | |
598 | seq, ack, sack, win, end); | |
599 | pr_debug("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i " | |
600 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", | |
601 | sender->td_end, sender->td_maxend, sender->td_maxwin, | |
602 | sender->td_scale, | |
603 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, | |
604 | receiver->td_scale); | |
605 | ||
606 | pr_debug("tcp_in_window: I=%i II=%i III=%i IV=%i\n", | |
607 | before(seq, sender->td_maxend + 1), | |
608 | after(end, sender->td_end - receiver->td_maxwin - 1), | |
609 | before(sack, receiver->td_end + 1), | |
610 | after(ack, receiver->td_end - MAXACKWINDOW(sender))); | |
9fb9cbb1 | 611 | |
a09113c2 PM |
612 | if (before(seq, sender->td_maxend + 1) && |
613 | after(end, sender->td_end - receiver->td_maxwin - 1) && | |
614 | before(sack, receiver->td_end + 1) && | |
615 | after(ack, receiver->td_end - MAXACKWINDOW(sender))) { | |
601e68e1 | 616 | /* |
9fb9cbb1 YK |
617 | * Take into account window scaling (RFC 1323). |
618 | */ | |
619 | if (!tcph->syn) | |
620 | win <<= sender->td_scale; | |
621 | ||
622 | /* | |
623 | * Update sender data. | |
624 | */ | |
625 | swin = win + (sack - ack); | |
626 | if (sender->td_maxwin < swin) | |
627 | sender->td_maxwin = swin; | |
628 | if (after(end, sender->td_end)) | |
629 | sender->td_end = end; | |
630 | /* | |
631 | * Update receiver data. | |
632 | */ | |
633 | if (after(end, sender->td_maxend)) | |
634 | receiver->td_maxwin += end - sender->td_maxend; | |
635 | if (after(sack + win, receiver->td_maxend - 1)) { | |
636 | receiver->td_maxend = sack + win; | |
637 | if (win == 0) | |
638 | receiver->td_maxend++; | |
639 | } | |
640 | ||
601e68e1 | 641 | /* |
9fb9cbb1 YK |
642 | * Check retransmissions. |
643 | */ | |
644 | if (index == TCP_ACK_SET) { | |
645 | if (state->last_dir == dir | |
646 | && state->last_seq == seq | |
647 | && state->last_ack == ack | |
c1fe3ca5 GH |
648 | && state->last_end == end |
649 | && state->last_win == win) | |
9fb9cbb1 YK |
650 | state->retrans++; |
651 | else { | |
652 | state->last_dir = dir; | |
653 | state->last_seq = seq; | |
654 | state->last_ack = ack; | |
655 | state->last_end = end; | |
c1fe3ca5 | 656 | state->last_win = win; |
9fb9cbb1 YK |
657 | state->retrans = 0; |
658 | } | |
659 | } | |
9fb9cbb1 YK |
660 | res = 1; |
661 | } else { | |
a09113c2 PM |
662 | res = 0; |
663 | if (sender->flags & IP_CT_TCP_FLAG_BE_LIBERAL || | |
664 | nf_ct_tcp_be_liberal) | |
665 | res = 1; | |
666 | if (!res && LOG_INVALID(IPPROTO_TCP)) | |
9fb9cbb1 YK |
667 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
668 | "nf_ct_tcp: %s ", | |
669 | before(seq, sender->td_maxend + 1) ? | |
670 | after(end, sender->td_end - receiver->td_maxwin - 1) ? | |
671 | before(sack, receiver->td_end + 1) ? | |
672 | after(ack, receiver->td_end - MAXACKWINDOW(sender)) ? "BUG" | |
673 | : "ACK is under the lower bound (possible overly delayed ACK)" | |
674 | : "ACK is over the upper bound (ACKed data not seen yet)" | |
675 | : "SEQ is under the lower bound (already ACKed data retransmitted)" | |
676 | : "SEQ is over the upper bound (over the window of the receiver)"); | |
601e68e1 YH |
677 | } |
678 | ||
0d53778e PM |
679 | pr_debug("tcp_in_window: res=%i sender end=%u maxend=%u maxwin=%u " |
680 | "receiver end=%u maxend=%u maxwin=%u\n", | |
681 | res, sender->td_end, sender->td_maxend, sender->td_maxwin, | |
682 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin); | |
9fb9cbb1 YK |
683 | |
684 | return res; | |
685 | } | |
686 | ||
5b1158e9 | 687 | #ifdef CONFIG_NF_NAT_NEEDED |
9fb9cbb1 YK |
688 | /* Update sender->td_end after NAT successfully mangled the packet */ |
689 | /* Caller must linearize skb at tcp header. */ | |
82f568fc | 690 | void nf_conntrack_tcp_update(const struct sk_buff *skb, |
9fb9cbb1 | 691 | unsigned int dataoff, |
c88130bc | 692 | struct nf_conn *ct, |
9fb9cbb1 YK |
693 | int dir) |
694 | { | |
82f568fc JE |
695 | const struct tcphdr *tcph = (const void *)skb->data + dataoff; |
696 | const struct ip_ct_tcp_state *sender = &ct->proto.tcp.seen[dir]; | |
697 | const struct ip_ct_tcp_state *receiver = &ct->proto.tcp.seen[!dir]; | |
0d53778e | 698 | __u32 end; |
9fb9cbb1 YK |
699 | |
700 | end = segment_seq_plus_len(ntohl(tcph->seq), skb->len, dataoff, tcph); | |
701 | ||
702 | write_lock_bh(&tcp_lock); | |
703 | /* | |
704 | * We have to worry for the ack in the reply packet only... | |
705 | */ | |
c88130bc PM |
706 | if (after(end, ct->proto.tcp.seen[dir].td_end)) |
707 | ct->proto.tcp.seen[dir].td_end = end; | |
708 | ct->proto.tcp.last_end = end; | |
9fb9cbb1 | 709 | write_unlock_bh(&tcp_lock); |
0d53778e PM |
710 | pr_debug("tcp_update: sender end=%u maxend=%u maxwin=%u scale=%i " |
711 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", | |
712 | sender->td_end, sender->td_maxend, sender->td_maxwin, | |
713 | sender->td_scale, | |
714 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, | |
715 | receiver->td_scale); | |
9fb9cbb1 | 716 | } |
13b18339 | 717 | EXPORT_SYMBOL_GPL(nf_conntrack_tcp_update); |
9fb9cbb1 YK |
718 | #endif |
719 | ||
720 | #define TH_FIN 0x01 | |
721 | #define TH_SYN 0x02 | |
722 | #define TH_RST 0x04 | |
723 | #define TH_PUSH 0x08 | |
724 | #define TH_ACK 0x10 | |
725 | #define TH_URG 0x20 | |
726 | #define TH_ECE 0x40 | |
727 | #define TH_CWR 0x80 | |
728 | ||
5c8ce7c9 | 729 | /* table of valid flag combinations - PUSH, ECE and CWR are always valid */ |
82f568fc | 730 | static const u8 tcp_valid_flags[(TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG) + 1] = |
9fb9cbb1 YK |
731 | { |
732 | [TH_SYN] = 1, | |
d3ab4298 | 733 | [TH_SYN|TH_URG] = 1, |
d3ab4298 | 734 | [TH_SYN|TH_ACK] = 1, |
9fb9cbb1 YK |
735 | [TH_RST] = 1, |
736 | [TH_RST|TH_ACK] = 1, | |
9fb9cbb1 | 737 | [TH_FIN|TH_ACK] = 1, |
5c8ce7c9 | 738 | [TH_FIN|TH_ACK|TH_URG] = 1, |
9fb9cbb1 | 739 | [TH_ACK] = 1, |
9fb9cbb1 | 740 | [TH_ACK|TH_URG] = 1, |
9fb9cbb1 YK |
741 | }; |
742 | ||
743 | /* Protect conntrack agaist broken packets. Code taken from ipt_unclean.c. */ | |
744 | static int tcp_error(struct sk_buff *skb, | |
745 | unsigned int dataoff, | |
746 | enum ip_conntrack_info *ctinfo, | |
747 | int pf, | |
96f6bf82 | 748 | unsigned int hooknum) |
9fb9cbb1 | 749 | { |
82f568fc JE |
750 | const struct tcphdr *th; |
751 | struct tcphdr _tcph; | |
9fb9cbb1 YK |
752 | unsigned int tcplen = skb->len - dataoff; |
753 | u_int8_t tcpflags; | |
754 | ||
755 | /* Smaller that minimal TCP header? */ | |
756 | th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph); | |
757 | if (th == NULL) { | |
758 | if (LOG_INVALID(IPPROTO_TCP)) | |
759 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, | |
760 | "nf_ct_tcp: short packet "); | |
761 | return -NF_ACCEPT; | |
601e68e1 YH |
762 | } |
763 | ||
9fb9cbb1 YK |
764 | /* Not whole TCP header or malformed packet */ |
765 | if (th->doff*4 < sizeof(struct tcphdr) || tcplen < th->doff*4) { | |
766 | if (LOG_INVALID(IPPROTO_TCP)) | |
767 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, | |
768 | "nf_ct_tcp: truncated/malformed packet "); | |
769 | return -NF_ACCEPT; | |
770 | } | |
601e68e1 | 771 | |
9fb9cbb1 YK |
772 | /* Checksum invalid? Ignore. |
773 | * We skip checking packets on the outgoing path | |
84fa7933 | 774 | * because the checksum is assumed to be correct. |
9fb9cbb1 YK |
775 | */ |
776 | /* FIXME: Source route IP option packets --RR */ | |
6e23ae2a | 777 | if (nf_conntrack_checksum && hooknum == NF_INET_PRE_ROUTING && |
96f6bf82 | 778 | nf_checksum(skb, hooknum, dataoff, IPPROTO_TCP, pf)) { |
9fb9cbb1 YK |
779 | if (LOG_INVALID(IPPROTO_TCP)) |
780 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, | |
781 | "nf_ct_tcp: bad TCP checksum "); | |
782 | return -NF_ACCEPT; | |
783 | } | |
784 | ||
785 | /* Check TCP flags. */ | |
5c8ce7c9 | 786 | tcpflags = (((u_int8_t *)th)[13] & ~(TH_ECE|TH_CWR|TH_PUSH)); |
9fb9cbb1 YK |
787 | if (!tcp_valid_flags[tcpflags]) { |
788 | if (LOG_INVALID(IPPROTO_TCP)) | |
789 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, | |
790 | "nf_ct_tcp: invalid TCP flag combination "); | |
791 | return -NF_ACCEPT; | |
792 | } | |
793 | ||
794 | return NF_ACCEPT; | |
795 | } | |
796 | ||
9fb9cbb1 | 797 | /* Returns verdict for packet, or -1 for invalid. */ |
c88130bc | 798 | static int tcp_packet(struct nf_conn *ct, |
9fb9cbb1 YK |
799 | const struct sk_buff *skb, |
800 | unsigned int dataoff, | |
801 | enum ip_conntrack_info ctinfo, | |
802 | int pf, | |
803 | unsigned int hooknum) | |
804 | { | |
0d53778e | 805 | struct nf_conntrack_tuple *tuple; |
9fb9cbb1 YK |
806 | enum tcp_conntrack new_state, old_state; |
807 | enum ip_conntrack_dir dir; | |
82f568fc JE |
808 | const struct tcphdr *th; |
809 | struct tcphdr _tcph; | |
9fb9cbb1 YK |
810 | unsigned long timeout; |
811 | unsigned int index; | |
812 | ||
813 | th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph); | |
814 | BUG_ON(th == NULL); | |
815 | ||
816 | write_lock_bh(&tcp_lock); | |
c88130bc | 817 | old_state = ct->proto.tcp.state; |
9fb9cbb1 YK |
818 | dir = CTINFO2DIR(ctinfo); |
819 | index = get_conntrack_index(th); | |
820 | new_state = tcp_conntracks[dir][index][old_state]; | |
c88130bc | 821 | tuple = &ct->tuplehash[dir].tuple; |
9fb9cbb1 YK |
822 | |
823 | switch (new_state) { | |
17311393 JK |
824 | case TCP_CONNTRACK_SYN_SENT: |
825 | if (old_state < TCP_CONNTRACK_TIME_WAIT) | |
826 | break; | |
c88130bc PM |
827 | if ((ct->proto.tcp.seen[!dir].flags & IP_CT_TCP_FLAG_CLOSE_INIT) |
828 | || (ct->proto.tcp.last_dir == dir | |
829 | && ct->proto.tcp.last_index == TCP_RST_SET)) { | |
bc34b841 JK |
830 | /* Attempt to reopen a closed/aborted connection. |
831 | * Delete this connection and look up again. */ | |
17311393 | 832 | write_unlock_bh(&tcp_lock); |
c88130bc PM |
833 | if (del_timer(&ct->timeout)) |
834 | ct->timeout.function((unsigned long)ct); | |
17311393 JK |
835 | return -NF_REPEAT; |
836 | } | |
837 | /* Fall through */ | |
9fb9cbb1 | 838 | case TCP_CONNTRACK_IGNORE: |
73f30602 JK |
839 | /* Ignored packets: |
840 | * | |
841 | * a) SYN in ORIGINAL | |
842 | * b) SYN/ACK in REPLY | |
601e68e1 | 843 | * c) ACK in reply direction after initial SYN in original. |
73f30602 | 844 | */ |
9fb9cbb1 | 845 | if (index == TCP_SYNACK_SET |
c88130bc PM |
846 | && ct->proto.tcp.last_index == TCP_SYN_SET |
847 | && ct->proto.tcp.last_dir != dir | |
848 | && ntohl(th->ack_seq) == ct->proto.tcp.last_end) { | |
601e68e1 | 849 | /* This SYN/ACK acknowledges a SYN that we earlier |
9fb9cbb1 YK |
850 | * ignored as invalid. This means that the client and |
851 | * the server are both in sync, while the firewall is | |
852 | * not. We kill this session and block the SYN/ACK so | |
601e68e1 | 853 | * that the client cannot but retransmit its SYN and |
9fb9cbb1 YK |
854 | * thus initiate a clean new session. |
855 | */ | |
601e68e1 | 856 | write_unlock_bh(&tcp_lock); |
9fb9cbb1 YK |
857 | if (LOG_INVALID(IPPROTO_TCP)) |
858 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, | |
859 | "nf_ct_tcp: killing out of sync session "); | |
c88130bc PM |
860 | if (del_timer(&ct->timeout)) |
861 | ct->timeout.function((unsigned long)ct); | |
601e68e1 | 862 | return -NF_DROP; |
9fb9cbb1 | 863 | } |
c88130bc PM |
864 | ct->proto.tcp.last_index = index; |
865 | ct->proto.tcp.last_dir = dir; | |
866 | ct->proto.tcp.last_seq = ntohl(th->seq); | |
867 | ct->proto.tcp.last_end = | |
9fb9cbb1 YK |
868 | segment_seq_plus_len(ntohl(th->seq), skb->len, dataoff, th); |
869 | ||
870 | write_unlock_bh(&tcp_lock); | |
871 | if (LOG_INVALID(IPPROTO_TCP)) | |
872 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, | |
873 | "nf_ct_tcp: invalid packed ignored "); | |
874 | return NF_ACCEPT; | |
875 | case TCP_CONNTRACK_MAX: | |
876 | /* Invalid packet */ | |
0d53778e PM |
877 | pr_debug("nf_ct_tcp: Invalid dir=%i index=%u ostate=%u\n", |
878 | dir, get_conntrack_index(th), old_state); | |
9fb9cbb1 YK |
879 | write_unlock_bh(&tcp_lock); |
880 | if (LOG_INVALID(IPPROTO_TCP)) | |
881 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, | |
882 | "nf_ct_tcp: invalid state "); | |
883 | return -NF_ACCEPT; | |
9fb9cbb1 YK |
884 | case TCP_CONNTRACK_CLOSE: |
885 | if (index == TCP_RST_SET | |
c88130bc PM |
886 | && ((test_bit(IPS_SEEN_REPLY_BIT, &ct->status) |
887 | && ct->proto.tcp.last_index == TCP_SYN_SET) | |
888 | || (!test_bit(IPS_ASSURED_BIT, &ct->status) | |
889 | && ct->proto.tcp.last_index == TCP_ACK_SET)) | |
890 | && ntohl(th->ack_seq) == ct->proto.tcp.last_end) { | |
93b1fae4 | 891 | /* RST sent to invalid SYN or ACK we had let through |
73f30602 JK |
892 | * at a) and c) above: |
893 | * | |
894 | * a) SYN was in window then | |
895 | * c) we hold a half-open connection. | |
896 | * | |
897 | * Delete our connection entry. | |
9fb9cbb1 | 898 | * We skip window checking, because packet might ACK |
73f30602 | 899 | * segments we ignored. */ |
9fb9cbb1 YK |
900 | goto in_window; |
901 | } | |
93b1fae4 | 902 | /* Just fall through */ |
9fb9cbb1 YK |
903 | default: |
904 | /* Keep compilers happy. */ | |
905 | break; | |
906 | } | |
907 | ||
c88130bc | 908 | if (!tcp_in_window(ct, &ct->proto.tcp, dir, index, |
9fb9cbb1 YK |
909 | skb, dataoff, th, pf)) { |
910 | write_unlock_bh(&tcp_lock); | |
911 | return -NF_ACCEPT; | |
912 | } | |
913 | in_window: | |
914 | /* From now on we have got in-window packets */ | |
c88130bc PM |
915 | ct->proto.tcp.last_index = index; |
916 | ct->proto.tcp.last_dir = dir; | |
9fb9cbb1 | 917 | |
0d53778e PM |
918 | pr_debug("tcp_conntracks: "); |
919 | NF_CT_DUMP_TUPLE(tuple); | |
920 | pr_debug("syn=%i ack=%i fin=%i rst=%i old=%i new=%i\n", | |
921 | (th->syn ? 1 : 0), (th->ack ? 1 : 0), | |
922 | (th->fin ? 1 : 0), (th->rst ? 1 : 0), | |
923 | old_state, new_state); | |
9fb9cbb1 | 924 | |
c88130bc | 925 | ct->proto.tcp.state = new_state; |
9fb9cbb1 YK |
926 | if (old_state != new_state |
927 | && (new_state == TCP_CONNTRACK_FIN_WAIT | |
928 | || new_state == TCP_CONNTRACK_CLOSE)) | |
c88130bc PM |
929 | ct->proto.tcp.seen[dir].flags |= IP_CT_TCP_FLAG_CLOSE_INIT; |
930 | timeout = ct->proto.tcp.retrans >= nf_ct_tcp_max_retrans | |
2d646286 PM |
931 | && tcp_timeouts[new_state] > nf_ct_tcp_timeout_max_retrans |
932 | ? nf_ct_tcp_timeout_max_retrans : tcp_timeouts[new_state]; | |
9fb9cbb1 YK |
933 | write_unlock_bh(&tcp_lock); |
934 | ||
935 | nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb); | |
936 | if (new_state != old_state) | |
937 | nf_conntrack_event_cache(IPCT_PROTOINFO, skb); | |
938 | ||
c88130bc | 939 | if (!test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { |
9fb9cbb1 YK |
940 | /* If only reply is a RST, we can consider ourselves not to |
941 | have an established connection: this is a fairly common | |
942 | problem case, so we can delete the conntrack | |
943 | immediately. --RR */ | |
944 | if (th->rst) { | |
c88130bc PM |
945 | if (del_timer(&ct->timeout)) |
946 | ct->timeout.function((unsigned long)ct); | |
9fb9cbb1 YK |
947 | return NF_ACCEPT; |
948 | } | |
c88130bc | 949 | } else if (!test_bit(IPS_ASSURED_BIT, &ct->status) |
9fb9cbb1 YK |
950 | && (old_state == TCP_CONNTRACK_SYN_RECV |
951 | || old_state == TCP_CONNTRACK_ESTABLISHED) | |
952 | && new_state == TCP_CONNTRACK_ESTABLISHED) { | |
601e68e1 YH |
953 | /* Set ASSURED if we see see valid ack in ESTABLISHED |
954 | after SYN_RECV or a valid answer for a picked up | |
9fb9cbb1 | 955 | connection. */ |
c88130bc | 956 | set_bit(IPS_ASSURED_BIT, &ct->status); |
9fb9cbb1 YK |
957 | nf_conntrack_event_cache(IPCT_STATUS, skb); |
958 | } | |
c88130bc | 959 | nf_ct_refresh_acct(ct, ctinfo, skb, timeout); |
9fb9cbb1 YK |
960 | |
961 | return NF_ACCEPT; | |
962 | } | |
601e68e1 | 963 | |
9fb9cbb1 | 964 | /* Called when a new connection for this protocol found. */ |
c88130bc | 965 | static int tcp_new(struct nf_conn *ct, |
9fb9cbb1 YK |
966 | const struct sk_buff *skb, |
967 | unsigned int dataoff) | |
968 | { | |
969 | enum tcp_conntrack new_state; | |
82f568fc JE |
970 | const struct tcphdr *th; |
971 | struct tcphdr _tcph; | |
972 | const struct ip_ct_tcp_state *sender = &ct->proto.tcp.seen[0]; | |
973 | const struct ip_ct_tcp_state *receiver = &ct->proto.tcp.seen[1]; | |
9fb9cbb1 YK |
974 | |
975 | th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph); | |
976 | BUG_ON(th == NULL); | |
977 | ||
978 | /* Don't need lock here: this conntrack not in circulation yet */ | |
979 | new_state | |
980 | = tcp_conntracks[0][get_conntrack_index(th)] | |
981 | [TCP_CONNTRACK_NONE]; | |
982 | ||
983 | /* Invalid: delete conntrack */ | |
984 | if (new_state >= TCP_CONNTRACK_MAX) { | |
0d53778e | 985 | pr_debug("nf_ct_tcp: invalid new deleting.\n"); |
9fb9cbb1 YK |
986 | return 0; |
987 | } | |
988 | ||
989 | if (new_state == TCP_CONNTRACK_SYN_SENT) { | |
990 | /* SYN packet */ | |
c88130bc | 991 | ct->proto.tcp.seen[0].td_end = |
9fb9cbb1 YK |
992 | segment_seq_plus_len(ntohl(th->seq), skb->len, |
993 | dataoff, th); | |
c88130bc PM |
994 | ct->proto.tcp.seen[0].td_maxwin = ntohs(th->window); |
995 | if (ct->proto.tcp.seen[0].td_maxwin == 0) | |
996 | ct->proto.tcp.seen[0].td_maxwin = 1; | |
997 | ct->proto.tcp.seen[0].td_maxend = | |
998 | ct->proto.tcp.seen[0].td_end; | |
999 | ||
1000 | tcp_options(skb, dataoff, th, &ct->proto.tcp.seen[0]); | |
1001 | ct->proto.tcp.seen[1].flags = 0; | |
9fb9cbb1 YK |
1002 | } else if (nf_ct_tcp_loose == 0) { |
1003 | /* Don't try to pick up connections. */ | |
1004 | return 0; | |
1005 | } else { | |
1006 | /* | |
1007 | * We are in the middle of a connection, | |
1008 | * its history is lost for us. | |
1009 | * Let's try to use the data from the packet. | |
1010 | */ | |
c88130bc | 1011 | ct->proto.tcp.seen[0].td_end = |
9fb9cbb1 YK |
1012 | segment_seq_plus_len(ntohl(th->seq), skb->len, |
1013 | dataoff, th); | |
c88130bc PM |
1014 | ct->proto.tcp.seen[0].td_maxwin = ntohs(th->window); |
1015 | if (ct->proto.tcp.seen[0].td_maxwin == 0) | |
1016 | ct->proto.tcp.seen[0].td_maxwin = 1; | |
1017 | ct->proto.tcp.seen[0].td_maxend = | |
1018 | ct->proto.tcp.seen[0].td_end + | |
1019 | ct->proto.tcp.seen[0].td_maxwin; | |
1020 | ct->proto.tcp.seen[0].td_scale = 0; | |
9fb9cbb1 | 1021 | |
a09113c2 PM |
1022 | /* We assume SACK and liberal window checking to handle |
1023 | * window scaling */ | |
c88130bc PM |
1024 | ct->proto.tcp.seen[0].flags = |
1025 | ct->proto.tcp.seen[1].flags = IP_CT_TCP_FLAG_SACK_PERM | | |
1026 | IP_CT_TCP_FLAG_BE_LIBERAL; | |
9fb9cbb1 | 1027 | } |
601e68e1 | 1028 | |
c88130bc PM |
1029 | ct->proto.tcp.seen[1].td_end = 0; |
1030 | ct->proto.tcp.seen[1].td_maxend = 0; | |
1031 | ct->proto.tcp.seen[1].td_maxwin = 1; | |
1032 | ct->proto.tcp.seen[1].td_scale = 0; | |
9fb9cbb1 YK |
1033 | |
1034 | /* tcp_packet will set them */ | |
c88130bc PM |
1035 | ct->proto.tcp.state = TCP_CONNTRACK_NONE; |
1036 | ct->proto.tcp.last_index = TCP_NONE_SET; | |
601e68e1 | 1037 | |
0d53778e PM |
1038 | pr_debug("tcp_new: sender end=%u maxend=%u maxwin=%u scale=%i " |
1039 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", | |
1040 | sender->td_end, sender->td_maxend, sender->td_maxwin, | |
1041 | sender->td_scale, | |
1042 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, | |
1043 | receiver->td_scale); | |
9fb9cbb1 YK |
1044 | return 1; |
1045 | } | |
c1d10adb | 1046 | |
e281db5c | 1047 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
c1d10adb PNA |
1048 | |
1049 | #include <linux/netfilter/nfnetlink.h> | |
1050 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
1051 | ||
fdf70832 | 1052 | static int tcp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, |
c1d10adb PNA |
1053 | const struct nf_conn *ct) |
1054 | { | |
df6fb868 | 1055 | struct nlattr *nest_parms; |
c8e2078c | 1056 | struct nf_ct_tcp_flags tmp = {}; |
601e68e1 | 1057 | |
c1d10adb | 1058 | read_lock_bh(&tcp_lock); |
df6fb868 PM |
1059 | nest_parms = nla_nest_start(skb, CTA_PROTOINFO_TCP | NLA_F_NESTED); |
1060 | if (!nest_parms) | |
1061 | goto nla_put_failure; | |
1062 | ||
77236b6e | 1063 | NLA_PUT_U8(skb, CTA_PROTOINFO_TCP_STATE, ct->proto.tcp.state); |
c8e2078c | 1064 | |
77236b6e PM |
1065 | NLA_PUT_U8(skb, CTA_PROTOINFO_TCP_WSCALE_ORIGINAL, |
1066 | ct->proto.tcp.seen[0].td_scale); | |
c8e2078c | 1067 | |
77236b6e PM |
1068 | NLA_PUT_U8(skb, CTA_PROTOINFO_TCP_WSCALE_REPLY, |
1069 | ct->proto.tcp.seen[1].td_scale); | |
c8e2078c PNA |
1070 | |
1071 | tmp.flags = ct->proto.tcp.seen[0].flags; | |
df6fb868 | 1072 | NLA_PUT(skb, CTA_PROTOINFO_TCP_FLAGS_ORIGINAL, |
c8e2078c PNA |
1073 | sizeof(struct nf_ct_tcp_flags), &tmp); |
1074 | ||
1075 | tmp.flags = ct->proto.tcp.seen[1].flags; | |
df6fb868 | 1076 | NLA_PUT(skb, CTA_PROTOINFO_TCP_FLAGS_REPLY, |
c8e2078c | 1077 | sizeof(struct nf_ct_tcp_flags), &tmp); |
c1d10adb PNA |
1078 | read_unlock_bh(&tcp_lock); |
1079 | ||
df6fb868 | 1080 | nla_nest_end(skb, nest_parms); |
c1d10adb PNA |
1081 | |
1082 | return 0; | |
1083 | ||
df6fb868 | 1084 | nla_put_failure: |
c1d10adb PNA |
1085 | read_unlock_bh(&tcp_lock); |
1086 | return -1; | |
1087 | } | |
1088 | ||
f73e924c PM |
1089 | static const struct nla_policy tcp_nla_policy[CTA_PROTOINFO_TCP_MAX+1] = { |
1090 | [CTA_PROTOINFO_TCP_STATE] = { .type = NLA_U8 }, | |
1091 | [CTA_PROTOINFO_TCP_WSCALE_ORIGINAL] = { .type = NLA_U8 }, | |
1092 | [CTA_PROTOINFO_TCP_WSCALE_REPLY] = { .type = NLA_U8 }, | |
1093 | [CTA_PROTOINFO_TCP_FLAGS_ORIGINAL] = { .len = sizeof(struct nf_ct_tcp_flags) }, | |
1094 | [CTA_PROTOINFO_TCP_FLAGS_REPLY] = { .len = sizeof(struct nf_ct_tcp_flags) }, | |
c1d10adb PNA |
1095 | }; |
1096 | ||
fdf70832 | 1097 | static int nlattr_to_tcp(struct nlattr *cda[], struct nf_conn *ct) |
c1d10adb | 1098 | { |
2f0d2f10 | 1099 | struct nlattr *pattr = cda[CTA_PROTOINFO_TCP]; |
df6fb868 | 1100 | struct nlattr *tb[CTA_PROTOINFO_TCP_MAX+1]; |
f73e924c | 1101 | int err; |
c1d10adb PNA |
1102 | |
1103 | /* updates could not contain anything about the private | |
1104 | * protocol info, in that case skip the parsing */ | |
2f0d2f10 | 1105 | if (!pattr) |
c1d10adb PNA |
1106 | return 0; |
1107 | ||
2f0d2f10 | 1108 | err = nla_parse_nested(tb, CTA_PROTOINFO_TCP_MAX, pattr, tcp_nla_policy); |
f73e924c PM |
1109 | if (err < 0) |
1110 | return err; | |
c1d10adb | 1111 | |
df6fb868 | 1112 | if (!tb[CTA_PROTOINFO_TCP_STATE]) |
c1d10adb PNA |
1113 | return -EINVAL; |
1114 | ||
1115 | write_lock_bh(&tcp_lock); | |
77236b6e | 1116 | ct->proto.tcp.state = nla_get_u8(tb[CTA_PROTOINFO_TCP_STATE]); |
c8e2078c | 1117 | |
df6fb868 | 1118 | if (tb[CTA_PROTOINFO_TCP_FLAGS_ORIGINAL]) { |
c8e2078c | 1119 | struct nf_ct_tcp_flags *attr = |
df6fb868 | 1120 | nla_data(tb[CTA_PROTOINFO_TCP_FLAGS_ORIGINAL]); |
c8e2078c PNA |
1121 | ct->proto.tcp.seen[0].flags &= ~attr->mask; |
1122 | ct->proto.tcp.seen[0].flags |= attr->flags & attr->mask; | |
1123 | } | |
1124 | ||
df6fb868 | 1125 | if (tb[CTA_PROTOINFO_TCP_FLAGS_REPLY]) { |
c8e2078c | 1126 | struct nf_ct_tcp_flags *attr = |
df6fb868 | 1127 | nla_data(tb[CTA_PROTOINFO_TCP_FLAGS_REPLY]); |
c8e2078c PNA |
1128 | ct->proto.tcp.seen[1].flags &= ~attr->mask; |
1129 | ct->proto.tcp.seen[1].flags |= attr->flags & attr->mask; | |
1130 | } | |
1131 | ||
df6fb868 PM |
1132 | if (tb[CTA_PROTOINFO_TCP_WSCALE_ORIGINAL] && |
1133 | tb[CTA_PROTOINFO_TCP_WSCALE_REPLY] && | |
c8e2078c PNA |
1134 | ct->proto.tcp.seen[0].flags & IP_CT_TCP_FLAG_WINDOW_SCALE && |
1135 | ct->proto.tcp.seen[1].flags & IP_CT_TCP_FLAG_WINDOW_SCALE) { | |
77236b6e PM |
1136 | ct->proto.tcp.seen[0].td_scale = |
1137 | nla_get_u8(tb[CTA_PROTOINFO_TCP_WSCALE_ORIGINAL]); | |
1138 | ct->proto.tcp.seen[1].td_scale = | |
1139 | nla_get_u8(tb[CTA_PROTOINFO_TCP_WSCALE_REPLY]); | |
c8e2078c | 1140 | } |
c1d10adb PNA |
1141 | write_unlock_bh(&tcp_lock); |
1142 | ||
1143 | return 0; | |
1144 | } | |
1145 | #endif | |
933a41e7 PM |
1146 | |
1147 | #ifdef CONFIG_SYSCTL | |
1148 | static unsigned int tcp_sysctl_table_users; | |
1149 | static struct ctl_table_header *tcp_sysctl_header; | |
1150 | static struct ctl_table tcp_sysctl_table[] = { | |
1151 | { | |
933a41e7 | 1152 | .procname = "nf_conntrack_tcp_timeout_syn_sent", |
2d646286 | 1153 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_SENT], |
933a41e7 PM |
1154 | .maxlen = sizeof(unsigned int), |
1155 | .mode = 0644, | |
1156 | .proc_handler = &proc_dointvec_jiffies, | |
1157 | }, | |
1158 | { | |
933a41e7 | 1159 | .procname = "nf_conntrack_tcp_timeout_syn_recv", |
2d646286 | 1160 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_RECV], |
933a41e7 PM |
1161 | .maxlen = sizeof(unsigned int), |
1162 | .mode = 0644, | |
1163 | .proc_handler = &proc_dointvec_jiffies, | |
1164 | }, | |
1165 | { | |
933a41e7 | 1166 | .procname = "nf_conntrack_tcp_timeout_established", |
2d646286 | 1167 | .data = &tcp_timeouts[TCP_CONNTRACK_ESTABLISHED], |
933a41e7 PM |
1168 | .maxlen = sizeof(unsigned int), |
1169 | .mode = 0644, | |
1170 | .proc_handler = &proc_dointvec_jiffies, | |
1171 | }, | |
1172 | { | |
933a41e7 | 1173 | .procname = "nf_conntrack_tcp_timeout_fin_wait", |
2d646286 | 1174 | .data = &tcp_timeouts[TCP_CONNTRACK_FIN_WAIT], |
933a41e7 PM |
1175 | .maxlen = sizeof(unsigned int), |
1176 | .mode = 0644, | |
1177 | .proc_handler = &proc_dointvec_jiffies, | |
1178 | }, | |
1179 | { | |
933a41e7 | 1180 | .procname = "nf_conntrack_tcp_timeout_close_wait", |
2d646286 | 1181 | .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE_WAIT], |
933a41e7 PM |
1182 | .maxlen = sizeof(unsigned int), |
1183 | .mode = 0644, | |
1184 | .proc_handler = &proc_dointvec_jiffies, | |
1185 | }, | |
1186 | { | |
933a41e7 | 1187 | .procname = "nf_conntrack_tcp_timeout_last_ack", |
2d646286 | 1188 | .data = &tcp_timeouts[TCP_CONNTRACK_LAST_ACK], |
933a41e7 PM |
1189 | .maxlen = sizeof(unsigned int), |
1190 | .mode = 0644, | |
1191 | .proc_handler = &proc_dointvec_jiffies, | |
1192 | }, | |
1193 | { | |
933a41e7 | 1194 | .procname = "nf_conntrack_tcp_timeout_time_wait", |
2d646286 | 1195 | .data = &tcp_timeouts[TCP_CONNTRACK_TIME_WAIT], |
933a41e7 PM |
1196 | .maxlen = sizeof(unsigned int), |
1197 | .mode = 0644, | |
1198 | .proc_handler = &proc_dointvec_jiffies, | |
1199 | }, | |
1200 | { | |
933a41e7 | 1201 | .procname = "nf_conntrack_tcp_timeout_close", |
2d646286 | 1202 | .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE], |
933a41e7 PM |
1203 | .maxlen = sizeof(unsigned int), |
1204 | .mode = 0644, | |
1205 | .proc_handler = &proc_dointvec_jiffies, | |
1206 | }, | |
1207 | { | |
933a41e7 PM |
1208 | .procname = "nf_conntrack_tcp_timeout_max_retrans", |
1209 | .data = &nf_ct_tcp_timeout_max_retrans, | |
1210 | .maxlen = sizeof(unsigned int), | |
1211 | .mode = 0644, | |
1212 | .proc_handler = &proc_dointvec_jiffies, | |
1213 | }, | |
1214 | { | |
1215 | .ctl_name = NET_NF_CONNTRACK_TCP_LOOSE, | |
1216 | .procname = "nf_conntrack_tcp_loose", | |
1217 | .data = &nf_ct_tcp_loose, | |
1218 | .maxlen = sizeof(unsigned int), | |
1219 | .mode = 0644, | |
1220 | .proc_handler = &proc_dointvec, | |
1221 | }, | |
1222 | { | |
1223 | .ctl_name = NET_NF_CONNTRACK_TCP_BE_LIBERAL, | |
1224 | .procname = "nf_conntrack_tcp_be_liberal", | |
1225 | .data = &nf_ct_tcp_be_liberal, | |
1226 | .maxlen = sizeof(unsigned int), | |
1227 | .mode = 0644, | |
1228 | .proc_handler = &proc_dointvec, | |
1229 | }, | |
1230 | { | |
1231 | .ctl_name = NET_NF_CONNTRACK_TCP_MAX_RETRANS, | |
1232 | .procname = "nf_conntrack_tcp_max_retrans", | |
1233 | .data = &nf_ct_tcp_max_retrans, | |
1234 | .maxlen = sizeof(unsigned int), | |
1235 | .mode = 0644, | |
1236 | .proc_handler = &proc_dointvec, | |
1237 | }, | |
1238 | { | |
1239 | .ctl_name = 0 | |
1240 | } | |
1241 | }; | |
a999e683 PM |
1242 | |
1243 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT | |
1244 | static struct ctl_table tcp_compat_sysctl_table[] = { | |
1245 | { | |
a999e683 | 1246 | .procname = "ip_conntrack_tcp_timeout_syn_sent", |
2d646286 | 1247 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_SENT], |
a999e683 PM |
1248 | .maxlen = sizeof(unsigned int), |
1249 | .mode = 0644, | |
1250 | .proc_handler = &proc_dointvec_jiffies, | |
1251 | }, | |
1252 | { | |
a999e683 | 1253 | .procname = "ip_conntrack_tcp_timeout_syn_recv", |
2d646286 | 1254 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_RECV], |
a999e683 PM |
1255 | .maxlen = sizeof(unsigned int), |
1256 | .mode = 0644, | |
1257 | .proc_handler = &proc_dointvec_jiffies, | |
1258 | }, | |
1259 | { | |
a999e683 | 1260 | .procname = "ip_conntrack_tcp_timeout_established", |
2d646286 | 1261 | .data = &tcp_timeouts[TCP_CONNTRACK_ESTABLISHED], |
a999e683 PM |
1262 | .maxlen = sizeof(unsigned int), |
1263 | .mode = 0644, | |
1264 | .proc_handler = &proc_dointvec_jiffies, | |
1265 | }, | |
1266 | { | |
a999e683 | 1267 | .procname = "ip_conntrack_tcp_timeout_fin_wait", |
2d646286 | 1268 | .data = &tcp_timeouts[TCP_CONNTRACK_FIN_WAIT], |
a999e683 PM |
1269 | .maxlen = sizeof(unsigned int), |
1270 | .mode = 0644, | |
1271 | .proc_handler = &proc_dointvec_jiffies, | |
1272 | }, | |
1273 | { | |
a999e683 | 1274 | .procname = "ip_conntrack_tcp_timeout_close_wait", |
2d646286 | 1275 | .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE_WAIT], |
a999e683 PM |
1276 | .maxlen = sizeof(unsigned int), |
1277 | .mode = 0644, | |
1278 | .proc_handler = &proc_dointvec_jiffies, | |
1279 | }, | |
1280 | { | |
a999e683 | 1281 | .procname = "ip_conntrack_tcp_timeout_last_ack", |
2d646286 | 1282 | .data = &tcp_timeouts[TCP_CONNTRACK_LAST_ACK], |
a999e683 PM |
1283 | .maxlen = sizeof(unsigned int), |
1284 | .mode = 0644, | |
1285 | .proc_handler = &proc_dointvec_jiffies, | |
1286 | }, | |
1287 | { | |
a999e683 | 1288 | .procname = "ip_conntrack_tcp_timeout_time_wait", |
2d646286 | 1289 | .data = &tcp_timeouts[TCP_CONNTRACK_TIME_WAIT], |
a999e683 PM |
1290 | .maxlen = sizeof(unsigned int), |
1291 | .mode = 0644, | |
1292 | .proc_handler = &proc_dointvec_jiffies, | |
1293 | }, | |
1294 | { | |
a999e683 | 1295 | .procname = "ip_conntrack_tcp_timeout_close", |
2d646286 | 1296 | .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE], |
a999e683 PM |
1297 | .maxlen = sizeof(unsigned int), |
1298 | .mode = 0644, | |
1299 | .proc_handler = &proc_dointvec_jiffies, | |
1300 | }, | |
1301 | { | |
a999e683 PM |
1302 | .procname = "ip_conntrack_tcp_timeout_max_retrans", |
1303 | .data = &nf_ct_tcp_timeout_max_retrans, | |
1304 | .maxlen = sizeof(unsigned int), | |
1305 | .mode = 0644, | |
1306 | .proc_handler = &proc_dointvec_jiffies, | |
1307 | }, | |
1308 | { | |
1309 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_LOOSE, | |
1310 | .procname = "ip_conntrack_tcp_loose", | |
1311 | .data = &nf_ct_tcp_loose, | |
1312 | .maxlen = sizeof(unsigned int), | |
1313 | .mode = 0644, | |
1314 | .proc_handler = &proc_dointvec, | |
1315 | }, | |
1316 | { | |
1317 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL, | |
1318 | .procname = "ip_conntrack_tcp_be_liberal", | |
1319 | .data = &nf_ct_tcp_be_liberal, | |
1320 | .maxlen = sizeof(unsigned int), | |
1321 | .mode = 0644, | |
1322 | .proc_handler = &proc_dointvec, | |
1323 | }, | |
1324 | { | |
1325 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS, | |
1326 | .procname = "ip_conntrack_tcp_max_retrans", | |
1327 | .data = &nf_ct_tcp_max_retrans, | |
1328 | .maxlen = sizeof(unsigned int), | |
1329 | .mode = 0644, | |
1330 | .proc_handler = &proc_dointvec, | |
1331 | }, | |
1332 | { | |
1333 | .ctl_name = 0 | |
1334 | } | |
1335 | }; | |
1336 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ | |
933a41e7 PM |
1337 | #endif /* CONFIG_SYSCTL */ |
1338 | ||
61075af5 | 1339 | struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4 __read_mostly = |
9fb9cbb1 YK |
1340 | { |
1341 | .l3proto = PF_INET, | |
605dcad6 | 1342 | .l4proto = IPPROTO_TCP, |
9fb9cbb1 YK |
1343 | .name = "tcp", |
1344 | .pkt_to_tuple = tcp_pkt_to_tuple, | |
1345 | .invert_tuple = tcp_invert_tuple, | |
1346 | .print_tuple = tcp_print_tuple, | |
1347 | .print_conntrack = tcp_print_conntrack, | |
1348 | .packet = tcp_packet, | |
1349 | .new = tcp_new, | |
96f6bf82 | 1350 | .error = tcp_error, |
e281db5c | 1351 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
fdf70832 PM |
1352 | .to_nlattr = tcp_to_nlattr, |
1353 | .from_nlattr = nlattr_to_tcp, | |
1354 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, | |
1355 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, | |
f73e924c | 1356 | .nla_policy = nf_ct_port_nla_policy, |
c1d10adb | 1357 | #endif |
933a41e7 PM |
1358 | #ifdef CONFIG_SYSCTL |
1359 | .ctl_table_users = &tcp_sysctl_table_users, | |
1360 | .ctl_table_header = &tcp_sysctl_header, | |
1361 | .ctl_table = tcp_sysctl_table, | |
a999e683 PM |
1362 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
1363 | .ctl_compat_table = tcp_compat_sysctl_table, | |
1364 | #endif | |
933a41e7 | 1365 | #endif |
9fb9cbb1 | 1366 | }; |
13b18339 | 1367 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp4); |
9fb9cbb1 | 1368 | |
61075af5 | 1369 | struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6 __read_mostly = |
9fb9cbb1 YK |
1370 | { |
1371 | .l3proto = PF_INET6, | |
605dcad6 | 1372 | .l4proto = IPPROTO_TCP, |
9fb9cbb1 YK |
1373 | .name = "tcp", |
1374 | .pkt_to_tuple = tcp_pkt_to_tuple, | |
1375 | .invert_tuple = tcp_invert_tuple, | |
1376 | .print_tuple = tcp_print_tuple, | |
1377 | .print_conntrack = tcp_print_conntrack, | |
1378 | .packet = tcp_packet, | |
1379 | .new = tcp_new, | |
96f6bf82 | 1380 | .error = tcp_error, |
e281db5c | 1381 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
fdf70832 PM |
1382 | .to_nlattr = tcp_to_nlattr, |
1383 | .from_nlattr = nlattr_to_tcp, | |
1384 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, | |
1385 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, | |
f73e924c | 1386 | .nla_policy = nf_ct_port_nla_policy, |
c1d10adb | 1387 | #endif |
933a41e7 PM |
1388 | #ifdef CONFIG_SYSCTL |
1389 | .ctl_table_users = &tcp_sysctl_table_users, | |
1390 | .ctl_table_header = &tcp_sysctl_header, | |
1391 | .ctl_table = tcp_sysctl_table, | |
1392 | #endif | |
9fb9cbb1 | 1393 | }; |
13b18339 | 1394 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp6); |