]>
Commit | Line | Data |
---|---|---|
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> |
9fb9cbb1 | 27 | |
9fb9cbb1 YK |
28 | /* Protects conntrack->proto.tcp */ |
29 | static DEFINE_RWLOCK(tcp_lock); | |
30 | ||
601e68e1 YH |
31 | /* "Be conservative in what you do, |
32 | be liberal in what you accept from others." | |
9fb9cbb1 | 33 | If it's non-zero, we mark only out of window RST segments as INVALID. */ |
3aef0fd9 | 34 | static int nf_ct_tcp_be_liberal __read_mostly = 0; |
9fb9cbb1 | 35 | |
a09113c2 | 36 | /* If it is set to zero, we disable picking up already established |
9fb9cbb1 | 37 | connections. */ |
3aef0fd9 | 38 | static int nf_ct_tcp_loose __read_mostly = 1; |
9fb9cbb1 | 39 | |
601e68e1 YH |
40 | /* Max number of the retransmitted packets without receiving an (acceptable) |
41 | ACK from the destination. If this number is reached, a shorter timer | |
9fb9cbb1 | 42 | will be started. */ |
3aef0fd9 | 43 | static int nf_ct_tcp_max_retrans __read_mostly = 3; |
9fb9cbb1 YK |
44 | |
45 | /* FIXME: Examine ipfilter's timeouts and conntrack transitions more | |
46 | closely. They're more complex. --RR */ | |
47 | ||
48 | static const char *tcp_conntrack_names[] = { | |
49 | "NONE", | |
50 | "SYN_SENT", | |
51 | "SYN_RECV", | |
52 | "ESTABLISHED", | |
53 | "FIN_WAIT", | |
54 | "CLOSE_WAIT", | |
55 | "LAST_ACK", | |
56 | "TIME_WAIT", | |
57 | "CLOSE", | |
58 | "LISTEN" | |
59 | }; | |
601e68e1 | 60 | |
9fb9cbb1 YK |
61 | #define SECS * HZ |
62 | #define MINS * 60 SECS | |
63 | #define HOURS * 60 MINS | |
64 | #define DAYS * 24 HOURS | |
65 | ||
933a41e7 PM |
66 | static unsigned int nf_ct_tcp_timeout_syn_sent __read_mostly = 2 MINS; |
67 | static unsigned int nf_ct_tcp_timeout_syn_recv __read_mostly = 60 SECS; | |
68 | static unsigned int nf_ct_tcp_timeout_established __read_mostly = 5 DAYS; | |
69 | static unsigned int nf_ct_tcp_timeout_fin_wait __read_mostly = 2 MINS; | |
70 | static unsigned int nf_ct_tcp_timeout_close_wait __read_mostly = 60 SECS; | |
71 | static unsigned int nf_ct_tcp_timeout_last_ack __read_mostly = 30 SECS; | |
72 | static unsigned int nf_ct_tcp_timeout_time_wait __read_mostly = 2 MINS; | |
73 | static unsigned int nf_ct_tcp_timeout_close __read_mostly = 10 SECS; | |
9fb9cbb1 YK |
74 | |
75 | /* RFC1122 says the R2 limit should be at least 100 seconds. | |
601e68e1 | 76 | Linux uses 15 packets as limit, which corresponds |
9fb9cbb1 | 77 | to ~13-30min depending on RTO. */ |
933a41e7 | 78 | static unsigned int nf_ct_tcp_timeout_max_retrans __read_mostly = 5 MINS; |
601e68e1 | 79 | |
933a41e7 PM |
80 | static unsigned int * tcp_timeouts[] = { |
81 | NULL, /* TCP_CONNTRACK_NONE */ | |
9fb9cbb1 YK |
82 | &nf_ct_tcp_timeout_syn_sent, /* TCP_CONNTRACK_SYN_SENT, */ |
83 | &nf_ct_tcp_timeout_syn_recv, /* TCP_CONNTRACK_SYN_RECV, */ | |
84 | &nf_ct_tcp_timeout_established, /* TCP_CONNTRACK_ESTABLISHED, */ | |
85 | &nf_ct_tcp_timeout_fin_wait, /* TCP_CONNTRACK_FIN_WAIT, */ | |
86 | &nf_ct_tcp_timeout_close_wait, /* TCP_CONNTRACK_CLOSE_WAIT, */ | |
87 | &nf_ct_tcp_timeout_last_ack, /* TCP_CONNTRACK_LAST_ACK, */ | |
88 | &nf_ct_tcp_timeout_time_wait, /* TCP_CONNTRACK_TIME_WAIT, */ | |
89 | &nf_ct_tcp_timeout_close, /* TCP_CONNTRACK_CLOSE, */ | |
90 | NULL, /* TCP_CONNTRACK_LISTEN */ | |
91 | }; | |
601e68e1 | 92 | |
9fb9cbb1 YK |
93 | #define sNO TCP_CONNTRACK_NONE |
94 | #define sSS TCP_CONNTRACK_SYN_SENT | |
95 | #define sSR TCP_CONNTRACK_SYN_RECV | |
96 | #define sES TCP_CONNTRACK_ESTABLISHED | |
97 | #define sFW TCP_CONNTRACK_FIN_WAIT | |
98 | #define sCW TCP_CONNTRACK_CLOSE_WAIT | |
99 | #define sLA TCP_CONNTRACK_LAST_ACK | |
100 | #define sTW TCP_CONNTRACK_TIME_WAIT | |
101 | #define sCL TCP_CONNTRACK_CLOSE | |
102 | #define sLI TCP_CONNTRACK_LISTEN | |
103 | #define sIV TCP_CONNTRACK_MAX | |
104 | #define sIG TCP_CONNTRACK_IGNORE | |
105 | ||
106 | /* What TCP flags are set from RST/SYN/FIN/ACK. */ | |
107 | enum tcp_bit_set { | |
108 | TCP_SYN_SET, | |
109 | TCP_SYNACK_SET, | |
110 | TCP_FIN_SET, | |
111 | TCP_ACK_SET, | |
112 | TCP_RST_SET, | |
113 | TCP_NONE_SET, | |
114 | }; | |
601e68e1 | 115 | |
9fb9cbb1 YK |
116 | /* |
117 | * The TCP state transition table needs a few words... | |
118 | * | |
119 | * We are the man in the middle. All the packets go through us | |
120 | * but might get lost in transit to the destination. | |
601e68e1 | 121 | * It is assumed that the destinations can't receive segments |
9fb9cbb1 YK |
122 | * we haven't seen. |
123 | * | |
124 | * The checked segment is in window, but our windows are *not* | |
125 | * equivalent with the ones of the sender/receiver. We always | |
126 | * try to guess the state of the current sender. | |
127 | * | |
128 | * The meaning of the states are: | |
129 | * | |
130 | * NONE: initial state | |
601e68e1 | 131 | * SYN_SENT: SYN-only packet seen |
9fb9cbb1 YK |
132 | * SYN_RECV: SYN-ACK packet seen |
133 | * ESTABLISHED: ACK packet seen | |
134 | * FIN_WAIT: FIN packet seen | |
601e68e1 | 135 | * CLOSE_WAIT: ACK seen (after FIN) |
9fb9cbb1 YK |
136 | * LAST_ACK: FIN seen (after FIN) |
137 | * TIME_WAIT: last ACK seen | |
138 | * CLOSE: closed connection | |
139 | * | |
140 | * LISTEN state is not used. | |
141 | * | |
142 | * Packets marked as IGNORED (sIG): | |
601e68e1 YH |
143 | * if they may be either invalid or valid |
144 | * and the receiver may send back a connection | |
9fb9cbb1 YK |
145 | * closing RST or a SYN/ACK. |
146 | * | |
147 | * Packets marked as INVALID (sIV): | |
148 | * if they are invalid | |
149 | * or we do not support the request (simultaneous open) | |
150 | */ | |
151 | static enum tcp_conntrack tcp_conntracks[2][6][TCP_CONNTRACK_MAX] = { | |
152 | { | |
153 | /* ORIGINAL */ | |
154 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
155 | /*syn*/ { sSS, sSS, sIG, sIG, sIG, sIG, sIG, sSS, sSS, sIV }, | |
156 | /* | |
157 | * sNO -> sSS Initialize a new connection | |
158 | * sSS -> sSS Retransmitted SYN | |
159 | * sSR -> sIG Late retransmitted SYN? | |
160 | * sES -> sIG Error: SYNs in window outside the SYN_SENT state | |
601e68e1 | 161 | * are errors. Receiver will reply with RST |
9fb9cbb1 YK |
162 | * and close the connection. |
163 | * Or we are not in sync and hold a dead connection. | |
164 | * sFW -> sIG | |
165 | * sCW -> sIG | |
166 | * sLA -> sIG | |
167 | * sTW -> sSS Reopened connection (RFC 1122). | |
168 | * sCL -> sSS | |
169 | */ | |
170 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
171 | /*synack*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV }, | |
172 | /* | |
173 | * A SYN/ACK from the client is always invalid: | |
601e68e1 | 174 | * - either it tries to set up a simultaneous open, which is |
9fb9cbb1 YK |
175 | * not supported; |
176 | * - or the firewall has just been inserted between the two hosts | |
601e68e1 | 177 | * during the session set-up. The SYN will be retransmitted |
9fb9cbb1 YK |
178 | * by the true client (or it'll time out). |
179 | */ | |
180 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
181 | /*fin*/ { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV }, | |
182 | /* | |
183 | * sNO -> sIV Too late and no reason to do anything... | |
184 | * sSS -> sIV Client migth not send FIN in this state: | |
185 | * we enforce waiting for a SYN/ACK reply first. | |
186 | * sSR -> sFW Close started. | |
187 | * sES -> sFW | |
188 | * sFW -> sLA FIN seen in both directions, waiting for | |
601e68e1 | 189 | * the last ACK. |
9fb9cbb1 YK |
190 | * Migth be a retransmitted FIN as well... |
191 | * sCW -> sLA | |
192 | * sLA -> sLA Retransmitted FIN. Remain in the same state. | |
193 | * sTW -> sTW | |
194 | * sCL -> sCL | |
195 | */ | |
196 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
197 | /*ack*/ { sES, sIV, sES, sES, sCW, sCW, sTW, sTW, sCL, sIV }, | |
198 | /* | |
199 | * sNO -> sES Assumed. | |
200 | * sSS -> sIV ACK is invalid: we haven't seen a SYN/ACK yet. | |
201 | * sSR -> sES Established state is reached. | |
202 | * sES -> sES :-) | |
203 | * sFW -> sCW Normal close request answered by ACK. | |
204 | * sCW -> sCW | |
205 | * sLA -> sTW Last ACK detected. | |
206 | * sTW -> sTW Retransmitted last ACK. Remain in the same state. | |
207 | * sCL -> sCL | |
208 | */ | |
209 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
210 | /*rst*/ { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV }, | |
211 | /*none*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV } | |
212 | }, | |
213 | { | |
214 | /* REPLY */ | |
215 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
216 | /*syn*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV }, | |
217 | /* | |
218 | * sNO -> sIV Never reached. | |
219 | * sSS -> sIV Simultaneous open, not supported | |
220 | * sSR -> sIV Simultaneous open, not supported. | |
221 | * sES -> sIV Server may not initiate a connection. | |
222 | * sFW -> sIV | |
223 | * sCW -> sIV | |
224 | * sLA -> sIV | |
225 | * sTW -> sIV Reopened connection, but server may not do it. | |
226 | * sCL -> sIV | |
227 | */ | |
228 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
229 | /*synack*/ { sIV, sSR, sSR, sIG, sIG, sIG, sIG, sIG, sIG, sIV }, | |
230 | /* | |
231 | * sSS -> sSR Standard open. | |
232 | * sSR -> sSR Retransmitted SYN/ACK. | |
233 | * sES -> sIG Late retransmitted SYN/ACK? | |
234 | * sFW -> sIG Might be SYN/ACK answering ignored SYN | |
235 | * sCW -> sIG | |
236 | * sLA -> sIG | |
237 | * sTW -> sIG | |
238 | * sCL -> sIG | |
239 | */ | |
240 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
241 | /*fin*/ { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV }, | |
242 | /* | |
243 | * sSS -> sIV Server might not send FIN in this state. | |
244 | * sSR -> sFW Close started. | |
245 | * sES -> sFW | |
246 | * sFW -> sLA FIN seen in both directions. | |
247 | * sCW -> sLA | |
248 | * sLA -> sLA Retransmitted FIN. | |
249 | * sTW -> sTW | |
250 | * sCL -> sCL | |
251 | */ | |
252 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
73f30602 | 253 | /*ack*/ { sIV, sIG, sSR, sES, sCW, sCW, sTW, sTW, sCL, sIV }, |
9fb9cbb1 | 254 | /* |
73f30602 | 255 | * sSS -> sIG Might be a half-open connection. |
9fb9cbb1 YK |
256 | * sSR -> sSR Might answer late resent SYN. |
257 | * sES -> sES :-) | |
258 | * sFW -> sCW Normal close request answered by ACK. | |
259 | * sCW -> sCW | |
260 | * sLA -> sTW Last ACK detected. | |
261 | * sTW -> sTW Retransmitted last ACK. | |
262 | * sCL -> sCL | |
263 | */ | |
264 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
265 | /*rst*/ { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV }, | |
266 | /*none*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV } | |
601e68e1 | 267 | } |
9fb9cbb1 YK |
268 | }; |
269 | ||
270 | static int tcp_pkt_to_tuple(const struct sk_buff *skb, | |
271 | unsigned int dataoff, | |
272 | struct nf_conntrack_tuple *tuple) | |
273 | { | |
274 | struct tcphdr _hdr, *hp; | |
275 | ||
276 | /* Actually only need first 8 bytes. */ | |
277 | hp = skb_header_pointer(skb, dataoff, 8, &_hdr); | |
278 | if (hp == NULL) | |
279 | return 0; | |
280 | ||
281 | tuple->src.u.tcp.port = hp->source; | |
282 | tuple->dst.u.tcp.port = hp->dest; | |
283 | ||
284 | return 1; | |
285 | } | |
286 | ||
287 | static int tcp_invert_tuple(struct nf_conntrack_tuple *tuple, | |
288 | const struct nf_conntrack_tuple *orig) | |
289 | { | |
290 | tuple->src.u.tcp.port = orig->dst.u.tcp.port; | |
291 | tuple->dst.u.tcp.port = orig->src.u.tcp.port; | |
292 | return 1; | |
293 | } | |
294 | ||
295 | /* Print out the per-protocol part of the tuple. */ | |
296 | static int tcp_print_tuple(struct seq_file *s, | |
297 | const struct nf_conntrack_tuple *tuple) | |
298 | { | |
299 | return seq_printf(s, "sport=%hu dport=%hu ", | |
300 | ntohs(tuple->src.u.tcp.port), | |
301 | ntohs(tuple->dst.u.tcp.port)); | |
302 | } | |
303 | ||
304 | /* Print out the private part of the conntrack. */ | |
305 | static int tcp_print_conntrack(struct seq_file *s, | |
306 | const struct nf_conn *conntrack) | |
307 | { | |
308 | enum tcp_conntrack state; | |
309 | ||
310 | read_lock_bh(&tcp_lock); | |
311 | state = conntrack->proto.tcp.state; | |
312 | read_unlock_bh(&tcp_lock); | |
313 | ||
314 | return seq_printf(s, "%s ", tcp_conntrack_names[state]); | |
315 | } | |
316 | ||
317 | static unsigned int get_conntrack_index(const struct tcphdr *tcph) | |
318 | { | |
319 | if (tcph->rst) return TCP_RST_SET; | |
320 | else if (tcph->syn) return (tcph->ack ? TCP_SYNACK_SET : TCP_SYN_SET); | |
321 | else if (tcph->fin) return TCP_FIN_SET; | |
322 | else if (tcph->ack) return TCP_ACK_SET; | |
323 | else return TCP_NONE_SET; | |
324 | } | |
325 | ||
326 | /* TCP connection tracking based on 'Real Stateful TCP Packet Filtering | |
327 | in IP Filter' by Guido van Rooij. | |
601e68e1 | 328 | |
9fb9cbb1 YK |
329 | http://www.nluug.nl/events/sane2000/papers.html |
330 | http://www.iae.nl/users/guido/papers/tcp_filtering.ps.gz | |
601e68e1 | 331 | |
9fb9cbb1 YK |
332 | The boundaries and the conditions are changed according to RFC793: |
333 | the packet must intersect the window (i.e. segments may be | |
334 | after the right or before the left edge) and thus receivers may ACK | |
335 | segments after the right edge of the window. | |
336 | ||
601e68e1 | 337 | td_maxend = max(sack + max(win,1)) seen in reply packets |
9fb9cbb1 YK |
338 | td_maxwin = max(max(win, 1)) + (sack - ack) seen in sent packets |
339 | td_maxwin += seq + len - sender.td_maxend | |
340 | if seq + len > sender.td_maxend | |
341 | td_end = max(seq + len) seen in sent packets | |
601e68e1 | 342 | |
9fb9cbb1 YK |
343 | I. Upper bound for valid data: seq <= sender.td_maxend |
344 | II. Lower bound for valid data: seq + len >= sender.td_end - receiver.td_maxwin | |
345 | III. Upper bound for valid ack: sack <= receiver.td_end | |
346 | IV. Lower bound for valid ack: ack >= receiver.td_end - MAXACKWINDOW | |
347 | ||
348 | where sack is the highest right edge of sack block found in the packet. | |
349 | ||
601e68e1 YH |
350 | The upper bound limit for a valid ack is not ignored - |
351 | we doesn't have to deal with fragments. | |
9fb9cbb1 YK |
352 | */ |
353 | ||
354 | static inline __u32 segment_seq_plus_len(__u32 seq, | |
355 | size_t len, | |
356 | unsigned int dataoff, | |
357 | struct tcphdr *tcph) | |
358 | { | |
359 | /* XXX Should I use payload length field in IP/IPv6 header ? | |
360 | * - YK */ | |
361 | return (seq + len - dataoff - tcph->doff*4 | |
362 | + (tcph->syn ? 1 : 0) + (tcph->fin ? 1 : 0)); | |
363 | } | |
601e68e1 | 364 | |
9fb9cbb1 YK |
365 | /* Fixme: what about big packets? */ |
366 | #define MAXACKWINCONST 66000 | |
367 | #define MAXACKWINDOW(sender) \ | |
368 | ((sender)->td_maxwin > MAXACKWINCONST ? (sender)->td_maxwin \ | |
369 | : MAXACKWINCONST) | |
601e68e1 | 370 | |
9fb9cbb1 YK |
371 | /* |
372 | * Simplified tcp_parse_options routine from tcp_input.c | |
373 | */ | |
374 | static void tcp_options(const struct sk_buff *skb, | |
375 | unsigned int dataoff, | |
601e68e1 | 376 | struct tcphdr *tcph, |
9fb9cbb1 YK |
377 | struct ip_ct_tcp_state *state) |
378 | { | |
379 | unsigned char buff[(15 * 4) - sizeof(struct tcphdr)]; | |
380 | unsigned char *ptr; | |
381 | int length = (tcph->doff*4) - sizeof(struct tcphdr); | |
382 | ||
383 | if (!length) | |
384 | return; | |
385 | ||
386 | ptr = skb_header_pointer(skb, dataoff + sizeof(struct tcphdr), | |
387 | length, buff); | |
388 | BUG_ON(ptr == NULL); | |
389 | ||
601e68e1 | 390 | state->td_scale = |
9fb9cbb1 YK |
391 | state->flags = 0; |
392 | ||
393 | while (length > 0) { | |
394 | int opcode=*ptr++; | |
395 | int opsize; | |
396 | ||
397 | switch (opcode) { | |
398 | case TCPOPT_EOL: | |
399 | return; | |
400 | case TCPOPT_NOP: /* Ref: RFC 793 section 3.1 */ | |
401 | length--; | |
402 | continue; | |
403 | default: | |
404 | opsize=*ptr++; | |
405 | if (opsize < 2) /* "silly options" */ | |
406 | return; | |
407 | if (opsize > length) | |
408 | break; /* don't parse partial options */ | |
409 | ||
601e68e1 | 410 | if (opcode == TCPOPT_SACK_PERM |
9fb9cbb1 YK |
411 | && opsize == TCPOLEN_SACK_PERM) |
412 | state->flags |= IP_CT_TCP_FLAG_SACK_PERM; | |
413 | else if (opcode == TCPOPT_WINDOW | |
414 | && opsize == TCPOLEN_WINDOW) { | |
415 | state->td_scale = *(u_int8_t *)ptr; | |
416 | ||
417 | if (state->td_scale > 14) { | |
418 | /* See RFC1323 */ | |
419 | state->td_scale = 14; | |
420 | } | |
421 | state->flags |= | |
422 | IP_CT_TCP_FLAG_WINDOW_SCALE; | |
423 | } | |
424 | ptr += opsize - 2; | |
425 | length -= opsize; | |
426 | } | |
427 | } | |
428 | } | |
429 | ||
430 | static void tcp_sack(const struct sk_buff *skb, unsigned int dataoff, | |
431 | struct tcphdr *tcph, __u32 *sack) | |
432 | { | |
601e68e1 | 433 | unsigned char buff[(15 * 4) - sizeof(struct tcphdr)]; |
9fb9cbb1 YK |
434 | unsigned char *ptr; |
435 | int length = (tcph->doff*4) - sizeof(struct tcphdr); | |
436 | __u32 tmp; | |
437 | ||
438 | if (!length) | |
439 | return; | |
440 | ||
441 | ptr = skb_header_pointer(skb, dataoff + sizeof(struct tcphdr), | |
442 | length, buff); | |
443 | BUG_ON(ptr == NULL); | |
444 | ||
445 | /* Fast path for timestamp-only option */ | |
446 | if (length == TCPOLEN_TSTAMP_ALIGNED*4 | |
8f05ce91 YH |
447 | && *(__be32 *)ptr == htonl((TCPOPT_NOP << 24) |
448 | | (TCPOPT_NOP << 16) | |
449 | | (TCPOPT_TIMESTAMP << 8) | |
450 | | TCPOLEN_TIMESTAMP)) | |
9fb9cbb1 YK |
451 | return; |
452 | ||
453 | while (length > 0) { | |
454 | int opcode = *ptr++; | |
455 | int opsize, i; | |
456 | ||
457 | switch (opcode) { | |
458 | case TCPOPT_EOL: | |
459 | return; | |
460 | case TCPOPT_NOP: /* Ref: RFC 793 section 3.1 */ | |
461 | length--; | |
462 | continue; | |
463 | default: | |
464 | opsize = *ptr++; | |
465 | if (opsize < 2) /* "silly options" */ | |
466 | return; | |
467 | if (opsize > length) | |
468 | break; /* don't parse partial options */ | |
469 | ||
601e68e1 YH |
470 | if (opcode == TCPOPT_SACK |
471 | && opsize >= (TCPOLEN_SACK_BASE | |
472 | + TCPOLEN_SACK_PERBLOCK) | |
473 | && !((opsize - TCPOLEN_SACK_BASE) | |
474 | % TCPOLEN_SACK_PERBLOCK)) { | |
475 | for (i = 0; | |
476 | i < (opsize - TCPOLEN_SACK_BASE); | |
477 | i += TCPOLEN_SACK_PERBLOCK) { | |
478 | tmp = ntohl(*((__be32 *)(ptr+i)+1)); | |
9fb9cbb1 YK |
479 | |
480 | if (after(tmp, *sack)) | |
481 | *sack = tmp; | |
482 | } | |
483 | return; | |
484 | } | |
485 | ptr += opsize - 2; | |
486 | length -= opsize; | |
487 | } | |
488 | } | |
489 | } | |
490 | ||
0d53778e PM |
491 | static int tcp_in_window(struct nf_conn *ct, |
492 | struct ip_ct_tcp *state, | |
601e68e1 YH |
493 | enum ip_conntrack_dir dir, |
494 | unsigned int index, | |
495 | const struct sk_buff *skb, | |
9fb9cbb1 | 496 | unsigned int dataoff, |
601e68e1 | 497 | struct tcphdr *tcph, |
9fb9cbb1 YK |
498 | int pf) |
499 | { | |
500 | struct ip_ct_tcp_state *sender = &state->seen[dir]; | |
501 | struct ip_ct_tcp_state *receiver = &state->seen[!dir]; | |
0d53778e | 502 | struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple; |
9fb9cbb1 YK |
503 | __u32 seq, ack, sack, end, win, swin; |
504 | int res; | |
505 | ||
506 | /* | |
507 | * Get the required data from the packet. | |
508 | */ | |
509 | seq = ntohl(tcph->seq); | |
510 | ack = sack = ntohl(tcph->ack_seq); | |
511 | win = ntohs(tcph->window); | |
512 | end = segment_seq_plus_len(seq, skb->len, dataoff, tcph); | |
513 | ||
514 | if (receiver->flags & IP_CT_TCP_FLAG_SACK_PERM) | |
515 | tcp_sack(skb, dataoff, tcph, &sack); | |
516 | ||
0d53778e PM |
517 | pr_debug("tcp_in_window: START\n"); |
518 | pr_debug("tcp_in_window: "); | |
519 | NF_CT_DUMP_TUPLE(tuple); | |
520 | pr_debug("seq=%u ack=%u sack=%u win=%u end=%u\n", | |
521 | seq, ack, sack, win, end); | |
522 | pr_debug("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i " | |
523 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", | |
524 | sender->td_end, sender->td_maxend, sender->td_maxwin, | |
525 | sender->td_scale, | |
526 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, | |
527 | receiver->td_scale); | |
9fb9cbb1 YK |
528 | |
529 | if (sender->td_end == 0) { | |
530 | /* | |
531 | * Initialize sender data. | |
532 | */ | |
533 | if (tcph->syn && tcph->ack) { | |
534 | /* | |
535 | * Outgoing SYN-ACK in reply to a SYN. | |
536 | */ | |
601e68e1 | 537 | sender->td_end = |
9fb9cbb1 YK |
538 | sender->td_maxend = end; |
539 | sender->td_maxwin = (win == 0 ? 1 : win); | |
540 | ||
541 | tcp_options(skb, dataoff, tcph, sender); | |
601e68e1 | 542 | /* |
9fb9cbb1 YK |
543 | * RFC 1323: |
544 | * Both sides must send the Window Scale option | |
545 | * to enable window scaling in either direction. | |
546 | */ | |
547 | if (!(sender->flags & IP_CT_TCP_FLAG_WINDOW_SCALE | |
548 | && receiver->flags & IP_CT_TCP_FLAG_WINDOW_SCALE)) | |
601e68e1 | 549 | sender->td_scale = |
9fb9cbb1 YK |
550 | receiver->td_scale = 0; |
551 | } else { | |
552 | /* | |
553 | * We are in the middle of a connection, | |
554 | * its history is lost for us. | |
555 | * Let's try to use the data from the packet. | |
601e68e1 | 556 | */ |
9fb9cbb1 YK |
557 | sender->td_end = end; |
558 | sender->td_maxwin = (win == 0 ? 1 : win); | |
559 | sender->td_maxend = end + sender->td_maxwin; | |
560 | } | |
561 | } else if (((state->state == TCP_CONNTRACK_SYN_SENT | |
562 | && dir == IP_CT_DIR_ORIGINAL) | |
563 | || (state->state == TCP_CONNTRACK_SYN_RECV | |
564 | && dir == IP_CT_DIR_REPLY)) | |
565 | && after(end, sender->td_end)) { | |
566 | /* | |
567 | * RFC 793: "if a TCP is reinitialized ... then it need | |
601e68e1 | 568 | * not wait at all; it must only be sure to use sequence |
9fb9cbb1 YK |
569 | * numbers larger than those recently used." |
570 | */ | |
571 | sender->td_end = | |
572 | sender->td_maxend = end; | |
573 | sender->td_maxwin = (win == 0 ? 1 : win); | |
574 | ||
575 | tcp_options(skb, dataoff, tcph, sender); | |
576 | } | |
577 | ||
578 | if (!(tcph->ack)) { | |
579 | /* | |
580 | * If there is no ACK, just pretend it was set and OK. | |
581 | */ | |
582 | ack = sack = receiver->td_end; | |
601e68e1 YH |
583 | } else if (((tcp_flag_word(tcph) & (TCP_FLAG_ACK|TCP_FLAG_RST)) == |
584 | (TCP_FLAG_ACK|TCP_FLAG_RST)) | |
9fb9cbb1 YK |
585 | && (ack == 0)) { |
586 | /* | |
587 | * Broken TCP stacks, that set ACK in RST packets as well | |
588 | * with zero ack value. | |
589 | */ | |
590 | ack = sack = receiver->td_end; | |
591 | } | |
592 | ||
593 | if (seq == end | |
594 | && (!tcph->rst | |
595 | || (seq == 0 && state->state == TCP_CONNTRACK_SYN_SENT))) | |
596 | /* | |
597 | * Packets contains no data: we assume it is valid | |
598 | * and check the ack value only. | |
599 | * However RST segments are always validated by their | |
600 | * SEQ number, except when seq == 0 (reset sent answering | |
601 | * SYN. | |
602 | */ | |
603 | seq = end = sender->td_end; | |
604 | ||
0d53778e PM |
605 | pr_debug("tcp_in_window: "); |
606 | NF_CT_DUMP_TUPLE(tuple); | |
607 | pr_debug("seq=%u ack=%u sack =%u win=%u end=%u\n", | |
608 | seq, ack, sack, win, end); | |
609 | pr_debug("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i " | |
610 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", | |
611 | sender->td_end, sender->td_maxend, sender->td_maxwin, | |
612 | sender->td_scale, | |
613 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, | |
614 | receiver->td_scale); | |
615 | ||
616 | pr_debug("tcp_in_window: I=%i II=%i III=%i IV=%i\n", | |
617 | before(seq, sender->td_maxend + 1), | |
618 | after(end, sender->td_end - receiver->td_maxwin - 1), | |
619 | before(sack, receiver->td_end + 1), | |
620 | after(ack, receiver->td_end - MAXACKWINDOW(sender))); | |
9fb9cbb1 | 621 | |
a09113c2 PM |
622 | if (before(seq, sender->td_maxend + 1) && |
623 | after(end, sender->td_end - receiver->td_maxwin - 1) && | |
624 | before(sack, receiver->td_end + 1) && | |
625 | after(ack, receiver->td_end - MAXACKWINDOW(sender))) { | |
601e68e1 | 626 | /* |
9fb9cbb1 YK |
627 | * Take into account window scaling (RFC 1323). |
628 | */ | |
629 | if (!tcph->syn) | |
630 | win <<= sender->td_scale; | |
631 | ||
632 | /* | |
633 | * Update sender data. | |
634 | */ | |
635 | swin = win + (sack - ack); | |
636 | if (sender->td_maxwin < swin) | |
637 | sender->td_maxwin = swin; | |
638 | if (after(end, sender->td_end)) | |
639 | sender->td_end = end; | |
640 | /* | |
641 | * Update receiver data. | |
642 | */ | |
643 | if (after(end, sender->td_maxend)) | |
644 | receiver->td_maxwin += end - sender->td_maxend; | |
645 | if (after(sack + win, receiver->td_maxend - 1)) { | |
646 | receiver->td_maxend = sack + win; | |
647 | if (win == 0) | |
648 | receiver->td_maxend++; | |
649 | } | |
650 | ||
601e68e1 | 651 | /* |
9fb9cbb1 YK |
652 | * Check retransmissions. |
653 | */ | |
654 | if (index == TCP_ACK_SET) { | |
655 | if (state->last_dir == dir | |
656 | && state->last_seq == seq | |
657 | && state->last_ack == ack | |
c1fe3ca5 GH |
658 | && state->last_end == end |
659 | && state->last_win == win) | |
9fb9cbb1 YK |
660 | state->retrans++; |
661 | else { | |
662 | state->last_dir = dir; | |
663 | state->last_seq = seq; | |
664 | state->last_ack = ack; | |
665 | state->last_end = end; | |
c1fe3ca5 | 666 | state->last_win = win; |
9fb9cbb1 YK |
667 | state->retrans = 0; |
668 | } | |
669 | } | |
9fb9cbb1 YK |
670 | res = 1; |
671 | } else { | |
a09113c2 PM |
672 | res = 0; |
673 | if (sender->flags & IP_CT_TCP_FLAG_BE_LIBERAL || | |
674 | nf_ct_tcp_be_liberal) | |
675 | res = 1; | |
676 | if (!res && LOG_INVALID(IPPROTO_TCP)) | |
9fb9cbb1 YK |
677 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
678 | "nf_ct_tcp: %s ", | |
679 | before(seq, sender->td_maxend + 1) ? | |
680 | after(end, sender->td_end - receiver->td_maxwin - 1) ? | |
681 | before(sack, receiver->td_end + 1) ? | |
682 | after(ack, receiver->td_end - MAXACKWINDOW(sender)) ? "BUG" | |
683 | : "ACK is under the lower bound (possible overly delayed ACK)" | |
684 | : "ACK is over the upper bound (ACKed data not seen yet)" | |
685 | : "SEQ is under the lower bound (already ACKed data retransmitted)" | |
686 | : "SEQ is over the upper bound (over the window of the receiver)"); | |
601e68e1 YH |
687 | } |
688 | ||
0d53778e PM |
689 | pr_debug("tcp_in_window: res=%i sender end=%u maxend=%u maxwin=%u " |
690 | "receiver end=%u maxend=%u maxwin=%u\n", | |
691 | res, sender->td_end, sender->td_maxend, sender->td_maxwin, | |
692 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin); | |
9fb9cbb1 YK |
693 | |
694 | return res; | |
695 | } | |
696 | ||
5b1158e9 | 697 | #ifdef CONFIG_NF_NAT_NEEDED |
9fb9cbb1 YK |
698 | /* Update sender->td_end after NAT successfully mangled the packet */ |
699 | /* Caller must linearize skb at tcp header. */ | |
700 | void nf_conntrack_tcp_update(struct sk_buff *skb, | |
701 | unsigned int dataoff, | |
601e68e1 | 702 | struct nf_conn *conntrack, |
9fb9cbb1 YK |
703 | int dir) |
704 | { | |
705 | struct tcphdr *tcph = (void *)skb->data + dataoff; | |
9fb9cbb1 YK |
706 | struct ip_ct_tcp_state *sender = &conntrack->proto.tcp.seen[dir]; |
707 | struct ip_ct_tcp_state *receiver = &conntrack->proto.tcp.seen[!dir]; | |
0d53778e | 708 | __u32 end; |
9fb9cbb1 YK |
709 | |
710 | end = segment_seq_plus_len(ntohl(tcph->seq), skb->len, dataoff, tcph); | |
711 | ||
712 | write_lock_bh(&tcp_lock); | |
713 | /* | |
714 | * We have to worry for the ack in the reply packet only... | |
715 | */ | |
716 | if (after(end, conntrack->proto.tcp.seen[dir].td_end)) | |
717 | conntrack->proto.tcp.seen[dir].td_end = end; | |
718 | conntrack->proto.tcp.last_end = end; | |
719 | write_unlock_bh(&tcp_lock); | |
0d53778e PM |
720 | pr_debug("tcp_update: sender end=%u maxend=%u maxwin=%u scale=%i " |
721 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", | |
722 | sender->td_end, sender->td_maxend, sender->td_maxwin, | |
723 | sender->td_scale, | |
724 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, | |
725 | receiver->td_scale); | |
9fb9cbb1 | 726 | } |
13b18339 | 727 | EXPORT_SYMBOL_GPL(nf_conntrack_tcp_update); |
9fb9cbb1 YK |
728 | #endif |
729 | ||
730 | #define TH_FIN 0x01 | |
731 | #define TH_SYN 0x02 | |
732 | #define TH_RST 0x04 | |
733 | #define TH_PUSH 0x08 | |
734 | #define TH_ACK 0x10 | |
735 | #define TH_URG 0x20 | |
736 | #define TH_ECE 0x40 | |
737 | #define TH_CWR 0x80 | |
738 | ||
5c8ce7c9 WT |
739 | /* table of valid flag combinations - PUSH, ECE and CWR are always valid */ |
740 | static u8 tcp_valid_flags[(TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG) + 1] = | |
9fb9cbb1 YK |
741 | { |
742 | [TH_SYN] = 1, | |
d3ab4298 | 743 | [TH_SYN|TH_URG] = 1, |
d3ab4298 | 744 | [TH_SYN|TH_ACK] = 1, |
9fb9cbb1 YK |
745 | [TH_RST] = 1, |
746 | [TH_RST|TH_ACK] = 1, | |
9fb9cbb1 | 747 | [TH_FIN|TH_ACK] = 1, |
5c8ce7c9 | 748 | [TH_FIN|TH_ACK|TH_URG] = 1, |
9fb9cbb1 | 749 | [TH_ACK] = 1, |
9fb9cbb1 | 750 | [TH_ACK|TH_URG] = 1, |
9fb9cbb1 YK |
751 | }; |
752 | ||
753 | /* Protect conntrack agaist broken packets. Code taken from ipt_unclean.c. */ | |
754 | static int tcp_error(struct sk_buff *skb, | |
755 | unsigned int dataoff, | |
756 | enum ip_conntrack_info *ctinfo, | |
757 | int pf, | |
96f6bf82 | 758 | unsigned int hooknum) |
9fb9cbb1 YK |
759 | { |
760 | struct tcphdr _tcph, *th; | |
761 | unsigned int tcplen = skb->len - dataoff; | |
762 | u_int8_t tcpflags; | |
763 | ||
764 | /* Smaller that minimal TCP header? */ | |
765 | th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph); | |
766 | if (th == NULL) { | |
767 | if (LOG_INVALID(IPPROTO_TCP)) | |
768 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, | |
769 | "nf_ct_tcp: short packet "); | |
770 | return -NF_ACCEPT; | |
601e68e1 YH |
771 | } |
772 | ||
9fb9cbb1 YK |
773 | /* Not whole TCP header or malformed packet */ |
774 | if (th->doff*4 < sizeof(struct tcphdr) || tcplen < th->doff*4) { | |
775 | if (LOG_INVALID(IPPROTO_TCP)) | |
776 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, | |
777 | "nf_ct_tcp: truncated/malformed packet "); | |
778 | return -NF_ACCEPT; | |
779 | } | |
601e68e1 | 780 | |
9fb9cbb1 YK |
781 | /* Checksum invalid? Ignore. |
782 | * We skip checking packets on the outgoing path | |
84fa7933 | 783 | * because the checksum is assumed to be correct. |
9fb9cbb1 YK |
784 | */ |
785 | /* FIXME: Source route IP option packets --RR */ | |
39a27a35 PM |
786 | if (nf_conntrack_checksum && |
787 | ((pf == PF_INET && hooknum == NF_IP_PRE_ROUTING) || | |
788 | (pf == PF_INET6 && hooknum == NF_IP6_PRE_ROUTING)) && | |
96f6bf82 | 789 | nf_checksum(skb, hooknum, dataoff, IPPROTO_TCP, pf)) { |
9fb9cbb1 YK |
790 | if (LOG_INVALID(IPPROTO_TCP)) |
791 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, | |
792 | "nf_ct_tcp: bad TCP checksum "); | |
793 | return -NF_ACCEPT; | |
794 | } | |
795 | ||
796 | /* Check TCP flags. */ | |
5c8ce7c9 | 797 | tcpflags = (((u_int8_t *)th)[13] & ~(TH_ECE|TH_CWR|TH_PUSH)); |
9fb9cbb1 YK |
798 | if (!tcp_valid_flags[tcpflags]) { |
799 | if (LOG_INVALID(IPPROTO_TCP)) | |
800 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, | |
801 | "nf_ct_tcp: invalid TCP flag combination "); | |
802 | return -NF_ACCEPT; | |
803 | } | |
804 | ||
805 | return NF_ACCEPT; | |
806 | } | |
807 | ||
9fb9cbb1 YK |
808 | /* Returns verdict for packet, or -1 for invalid. */ |
809 | static int tcp_packet(struct nf_conn *conntrack, | |
810 | const struct sk_buff *skb, | |
811 | unsigned int dataoff, | |
812 | enum ip_conntrack_info ctinfo, | |
813 | int pf, | |
814 | unsigned int hooknum) | |
815 | { | |
0d53778e | 816 | struct nf_conntrack_tuple *tuple; |
9fb9cbb1 YK |
817 | enum tcp_conntrack new_state, old_state; |
818 | enum ip_conntrack_dir dir; | |
819 | struct tcphdr *th, _tcph; | |
820 | unsigned long timeout; | |
821 | unsigned int index; | |
822 | ||
823 | th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph); | |
824 | BUG_ON(th == NULL); | |
825 | ||
826 | write_lock_bh(&tcp_lock); | |
827 | old_state = conntrack->proto.tcp.state; | |
828 | dir = CTINFO2DIR(ctinfo); | |
829 | index = get_conntrack_index(th); | |
830 | new_state = tcp_conntracks[dir][index][old_state]; | |
0d53778e | 831 | tuple = &conntrack->tuplehash[dir].tuple; |
9fb9cbb1 YK |
832 | |
833 | switch (new_state) { | |
17311393 JK |
834 | case TCP_CONNTRACK_SYN_SENT: |
835 | if (old_state < TCP_CONNTRACK_TIME_WAIT) | |
836 | break; | |
837 | if (conntrack->proto.tcp.seen[!dir].flags & | |
838 | IP_CT_TCP_FLAG_CLOSE_INIT) { | |
839 | /* Attempt to reopen a closed connection. | |
840 | * Delete this connection and look up again. */ | |
841 | write_unlock_bh(&tcp_lock); | |
842 | if (del_timer(&conntrack->timeout)) | |
843 | conntrack->timeout.function((unsigned long) | |
844 | conntrack); | |
845 | return -NF_REPEAT; | |
846 | } | |
847 | /* Fall through */ | |
9fb9cbb1 | 848 | case TCP_CONNTRACK_IGNORE: |
73f30602 JK |
849 | /* Ignored packets: |
850 | * | |
851 | * a) SYN in ORIGINAL | |
852 | * b) SYN/ACK in REPLY | |
601e68e1 | 853 | * c) ACK in reply direction after initial SYN in original. |
73f30602 | 854 | */ |
9fb9cbb1 YK |
855 | if (index == TCP_SYNACK_SET |
856 | && conntrack->proto.tcp.last_index == TCP_SYN_SET | |
857 | && conntrack->proto.tcp.last_dir != dir | |
858 | && ntohl(th->ack_seq) == | |
601e68e1 YH |
859 | conntrack->proto.tcp.last_end) { |
860 | /* This SYN/ACK acknowledges a SYN that we earlier | |
9fb9cbb1 YK |
861 | * ignored as invalid. This means that the client and |
862 | * the server are both in sync, while the firewall is | |
863 | * not. We kill this session and block the SYN/ACK so | |
601e68e1 | 864 | * that the client cannot but retransmit its SYN and |
9fb9cbb1 YK |
865 | * thus initiate a clean new session. |
866 | */ | |
601e68e1 | 867 | write_unlock_bh(&tcp_lock); |
9fb9cbb1 YK |
868 | if (LOG_INVALID(IPPROTO_TCP)) |
869 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, | |
870 | "nf_ct_tcp: killing out of sync session "); | |
601e68e1 YH |
871 | if (del_timer(&conntrack->timeout)) |
872 | conntrack->timeout.function((unsigned long) | |
873 | conntrack); | |
874 | return -NF_DROP; | |
9fb9cbb1 YK |
875 | } |
876 | conntrack->proto.tcp.last_index = index; | |
877 | conntrack->proto.tcp.last_dir = dir; | |
878 | conntrack->proto.tcp.last_seq = ntohl(th->seq); | |
879 | conntrack->proto.tcp.last_end = | |
880 | segment_seq_plus_len(ntohl(th->seq), skb->len, dataoff, th); | |
881 | ||
882 | write_unlock_bh(&tcp_lock); | |
883 | if (LOG_INVALID(IPPROTO_TCP)) | |
884 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, | |
885 | "nf_ct_tcp: invalid packed ignored "); | |
886 | return NF_ACCEPT; | |
887 | case TCP_CONNTRACK_MAX: | |
888 | /* Invalid packet */ | |
0d53778e PM |
889 | pr_debug("nf_ct_tcp: Invalid dir=%i index=%u ostate=%u\n", |
890 | dir, get_conntrack_index(th), old_state); | |
9fb9cbb1 YK |
891 | write_unlock_bh(&tcp_lock); |
892 | if (LOG_INVALID(IPPROTO_TCP)) | |
893 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, | |
894 | "nf_ct_tcp: invalid state "); | |
895 | return -NF_ACCEPT; | |
9fb9cbb1 YK |
896 | case TCP_CONNTRACK_CLOSE: |
897 | if (index == TCP_RST_SET | |
73f30602 | 898 | && ((test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status) |
601e68e1 YH |
899 | && conntrack->proto.tcp.last_index == TCP_SYN_SET) |
900 | || (!test_bit(IPS_ASSURED_BIT, &conntrack->status) | |
901 | && conntrack->proto.tcp.last_index == TCP_ACK_SET)) | |
9fb9cbb1 | 902 | && ntohl(th->ack_seq) == conntrack->proto.tcp.last_end) { |
93b1fae4 | 903 | /* RST sent to invalid SYN or ACK we had let through |
73f30602 JK |
904 | * at a) and c) above: |
905 | * | |
906 | * a) SYN was in window then | |
907 | * c) we hold a half-open connection. | |
908 | * | |
909 | * Delete our connection entry. | |
9fb9cbb1 | 910 | * We skip window checking, because packet might ACK |
73f30602 | 911 | * segments we ignored. */ |
9fb9cbb1 YK |
912 | goto in_window; |
913 | } | |
93b1fae4 | 914 | /* Just fall through */ |
9fb9cbb1 YK |
915 | default: |
916 | /* Keep compilers happy. */ | |
917 | break; | |
918 | } | |
919 | ||
0d53778e | 920 | if (!tcp_in_window(conntrack, &conntrack->proto.tcp, dir, index, |
9fb9cbb1 YK |
921 | skb, dataoff, th, pf)) { |
922 | write_unlock_bh(&tcp_lock); | |
923 | return -NF_ACCEPT; | |
924 | } | |
925 | in_window: | |
926 | /* From now on we have got in-window packets */ | |
927 | conntrack->proto.tcp.last_index = index; | |
928 | ||
0d53778e PM |
929 | pr_debug("tcp_conntracks: "); |
930 | NF_CT_DUMP_TUPLE(tuple); | |
931 | pr_debug("syn=%i ack=%i fin=%i rst=%i old=%i new=%i\n", | |
932 | (th->syn ? 1 : 0), (th->ack ? 1 : 0), | |
933 | (th->fin ? 1 : 0), (th->rst ? 1 : 0), | |
934 | old_state, new_state); | |
9fb9cbb1 YK |
935 | |
936 | conntrack->proto.tcp.state = new_state; | |
937 | if (old_state != new_state | |
938 | && (new_state == TCP_CONNTRACK_FIN_WAIT | |
939 | || new_state == TCP_CONNTRACK_CLOSE)) | |
940 | conntrack->proto.tcp.seen[dir].flags |= IP_CT_TCP_FLAG_CLOSE_INIT; | |
941 | timeout = conntrack->proto.tcp.retrans >= nf_ct_tcp_max_retrans | |
942 | && *tcp_timeouts[new_state] > nf_ct_tcp_timeout_max_retrans | |
943 | ? nf_ct_tcp_timeout_max_retrans : *tcp_timeouts[new_state]; | |
944 | write_unlock_bh(&tcp_lock); | |
945 | ||
946 | nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb); | |
947 | if (new_state != old_state) | |
948 | nf_conntrack_event_cache(IPCT_PROTOINFO, skb); | |
949 | ||
950 | if (!test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)) { | |
951 | /* If only reply is a RST, we can consider ourselves not to | |
952 | have an established connection: this is a fairly common | |
953 | problem case, so we can delete the conntrack | |
954 | immediately. --RR */ | |
955 | if (th->rst) { | |
956 | if (del_timer(&conntrack->timeout)) | |
957 | conntrack->timeout.function((unsigned long) | |
958 | conntrack); | |
959 | return NF_ACCEPT; | |
960 | } | |
961 | } else if (!test_bit(IPS_ASSURED_BIT, &conntrack->status) | |
962 | && (old_state == TCP_CONNTRACK_SYN_RECV | |
963 | || old_state == TCP_CONNTRACK_ESTABLISHED) | |
964 | && new_state == TCP_CONNTRACK_ESTABLISHED) { | |
601e68e1 YH |
965 | /* Set ASSURED if we see see valid ack in ESTABLISHED |
966 | after SYN_RECV or a valid answer for a picked up | |
9fb9cbb1 YK |
967 | connection. */ |
968 | set_bit(IPS_ASSURED_BIT, &conntrack->status); | |
969 | nf_conntrack_event_cache(IPCT_STATUS, skb); | |
970 | } | |
971 | nf_ct_refresh_acct(conntrack, ctinfo, skb, timeout); | |
972 | ||
973 | return NF_ACCEPT; | |
974 | } | |
601e68e1 | 975 | |
9fb9cbb1 YK |
976 | /* Called when a new connection for this protocol found. */ |
977 | static int tcp_new(struct nf_conn *conntrack, | |
978 | const struct sk_buff *skb, | |
979 | unsigned int dataoff) | |
980 | { | |
981 | enum tcp_conntrack new_state; | |
982 | struct tcphdr *th, _tcph; | |
9fb9cbb1 YK |
983 | struct ip_ct_tcp_state *sender = &conntrack->proto.tcp.seen[0]; |
984 | struct ip_ct_tcp_state *receiver = &conntrack->proto.tcp.seen[1]; | |
9fb9cbb1 YK |
985 | |
986 | th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph); | |
987 | BUG_ON(th == NULL); | |
988 | ||
989 | /* Don't need lock here: this conntrack not in circulation yet */ | |
990 | new_state | |
991 | = tcp_conntracks[0][get_conntrack_index(th)] | |
992 | [TCP_CONNTRACK_NONE]; | |
993 | ||
994 | /* Invalid: delete conntrack */ | |
995 | if (new_state >= TCP_CONNTRACK_MAX) { | |
0d53778e | 996 | pr_debug("nf_ct_tcp: invalid new deleting.\n"); |
9fb9cbb1 YK |
997 | return 0; |
998 | } | |
999 | ||
1000 | if (new_state == TCP_CONNTRACK_SYN_SENT) { | |
1001 | /* SYN packet */ | |
1002 | conntrack->proto.tcp.seen[0].td_end = | |
1003 | segment_seq_plus_len(ntohl(th->seq), skb->len, | |
1004 | dataoff, th); | |
1005 | conntrack->proto.tcp.seen[0].td_maxwin = ntohs(th->window); | |
1006 | if (conntrack->proto.tcp.seen[0].td_maxwin == 0) | |
1007 | conntrack->proto.tcp.seen[0].td_maxwin = 1; | |
1008 | conntrack->proto.tcp.seen[0].td_maxend = | |
1009 | conntrack->proto.tcp.seen[0].td_end; | |
1010 | ||
1011 | tcp_options(skb, dataoff, th, &conntrack->proto.tcp.seen[0]); | |
1012 | conntrack->proto.tcp.seen[1].flags = 0; | |
9fb9cbb1 YK |
1013 | } else if (nf_ct_tcp_loose == 0) { |
1014 | /* Don't try to pick up connections. */ | |
1015 | return 0; | |
1016 | } else { | |
1017 | /* | |
1018 | * We are in the middle of a connection, | |
1019 | * its history is lost for us. | |
1020 | * Let's try to use the data from the packet. | |
1021 | */ | |
1022 | conntrack->proto.tcp.seen[0].td_end = | |
1023 | segment_seq_plus_len(ntohl(th->seq), skb->len, | |
1024 | dataoff, th); | |
1025 | conntrack->proto.tcp.seen[0].td_maxwin = ntohs(th->window); | |
1026 | if (conntrack->proto.tcp.seen[0].td_maxwin == 0) | |
1027 | conntrack->proto.tcp.seen[0].td_maxwin = 1; | |
1028 | conntrack->proto.tcp.seen[0].td_maxend = | |
601e68e1 | 1029 | conntrack->proto.tcp.seen[0].td_end + |
9fb9cbb1 YK |
1030 | conntrack->proto.tcp.seen[0].td_maxwin; |
1031 | conntrack->proto.tcp.seen[0].td_scale = 0; | |
1032 | ||
a09113c2 PM |
1033 | /* We assume SACK and liberal window checking to handle |
1034 | * window scaling */ | |
9fb9cbb1 | 1035 | conntrack->proto.tcp.seen[0].flags = |
a09113c2 PM |
1036 | conntrack->proto.tcp.seen[1].flags = IP_CT_TCP_FLAG_SACK_PERM | |
1037 | IP_CT_TCP_FLAG_BE_LIBERAL; | |
9fb9cbb1 | 1038 | } |
601e68e1 | 1039 | |
9fb9cbb1 YK |
1040 | conntrack->proto.tcp.seen[1].td_end = 0; |
1041 | conntrack->proto.tcp.seen[1].td_maxend = 0; | |
1042 | conntrack->proto.tcp.seen[1].td_maxwin = 1; | |
601e68e1 | 1043 | conntrack->proto.tcp.seen[1].td_scale = 0; |
9fb9cbb1 YK |
1044 | |
1045 | /* tcp_packet will set them */ | |
1046 | conntrack->proto.tcp.state = TCP_CONNTRACK_NONE; | |
1047 | conntrack->proto.tcp.last_index = TCP_NONE_SET; | |
601e68e1 | 1048 | |
0d53778e PM |
1049 | pr_debug("tcp_new: sender end=%u maxend=%u maxwin=%u scale=%i " |
1050 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", | |
1051 | sender->td_end, sender->td_maxend, sender->td_maxwin, | |
1052 | sender->td_scale, | |
1053 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, | |
1054 | receiver->td_scale); | |
9fb9cbb1 YK |
1055 | return 1; |
1056 | } | |
c1d10adb | 1057 | |
e281db5c | 1058 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
c1d10adb PNA |
1059 | |
1060 | #include <linux/netfilter/nfnetlink.h> | |
1061 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
1062 | ||
fdf70832 | 1063 | static int tcp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, |
c1d10adb PNA |
1064 | const struct nf_conn *ct) |
1065 | { | |
df6fb868 | 1066 | struct nlattr *nest_parms; |
c8e2078c | 1067 | struct nf_ct_tcp_flags tmp = {}; |
601e68e1 | 1068 | |
c1d10adb | 1069 | read_lock_bh(&tcp_lock); |
df6fb868 PM |
1070 | nest_parms = nla_nest_start(skb, CTA_PROTOINFO_TCP | NLA_F_NESTED); |
1071 | if (!nest_parms) | |
1072 | goto nla_put_failure; | |
1073 | ||
1074 | NLA_PUT(skb, CTA_PROTOINFO_TCP_STATE, sizeof(u_int8_t), | |
c1d10adb | 1075 | &ct->proto.tcp.state); |
c8e2078c | 1076 | |
df6fb868 | 1077 | NLA_PUT(skb, CTA_PROTOINFO_TCP_WSCALE_ORIGINAL, sizeof(u_int8_t), |
c8e2078c PNA |
1078 | &ct->proto.tcp.seen[0].td_scale); |
1079 | ||
df6fb868 | 1080 | NLA_PUT(skb, CTA_PROTOINFO_TCP_WSCALE_REPLY, sizeof(u_int8_t), |
c8e2078c PNA |
1081 | &ct->proto.tcp.seen[1].td_scale); |
1082 | ||
1083 | tmp.flags = ct->proto.tcp.seen[0].flags; | |
df6fb868 | 1084 | NLA_PUT(skb, CTA_PROTOINFO_TCP_FLAGS_ORIGINAL, |
c8e2078c PNA |
1085 | sizeof(struct nf_ct_tcp_flags), &tmp); |
1086 | ||
1087 | tmp.flags = ct->proto.tcp.seen[1].flags; | |
df6fb868 | 1088 | NLA_PUT(skb, CTA_PROTOINFO_TCP_FLAGS_REPLY, |
c8e2078c | 1089 | sizeof(struct nf_ct_tcp_flags), &tmp); |
c1d10adb PNA |
1090 | read_unlock_bh(&tcp_lock); |
1091 | ||
df6fb868 | 1092 | nla_nest_end(skb, nest_parms); |
c1d10adb PNA |
1093 | |
1094 | return 0; | |
1095 | ||
df6fb868 | 1096 | nla_put_failure: |
c1d10adb PNA |
1097 | read_unlock_bh(&tcp_lock); |
1098 | return -1; | |
1099 | } | |
1100 | ||
f73e924c PM |
1101 | static const struct nla_policy tcp_nla_policy[CTA_PROTOINFO_TCP_MAX+1] = { |
1102 | [CTA_PROTOINFO_TCP_STATE] = { .type = NLA_U8 }, | |
1103 | [CTA_PROTOINFO_TCP_WSCALE_ORIGINAL] = { .type = NLA_U8 }, | |
1104 | [CTA_PROTOINFO_TCP_WSCALE_REPLY] = { .type = NLA_U8 }, | |
1105 | [CTA_PROTOINFO_TCP_FLAGS_ORIGINAL] = { .len = sizeof(struct nf_ct_tcp_flags) }, | |
1106 | [CTA_PROTOINFO_TCP_FLAGS_REPLY] = { .len = sizeof(struct nf_ct_tcp_flags) }, | |
c1d10adb PNA |
1107 | }; |
1108 | ||
fdf70832 | 1109 | static int nlattr_to_tcp(struct nlattr *cda[], struct nf_conn *ct) |
c1d10adb | 1110 | { |
df6fb868 PM |
1111 | struct nlattr *attr = cda[CTA_PROTOINFO_TCP]; |
1112 | struct nlattr *tb[CTA_PROTOINFO_TCP_MAX+1]; | |
f73e924c | 1113 | int err; |
c1d10adb PNA |
1114 | |
1115 | /* updates could not contain anything about the private | |
1116 | * protocol info, in that case skip the parsing */ | |
1117 | if (!attr) | |
1118 | return 0; | |
1119 | ||
f73e924c PM |
1120 | err = nla_parse_nested(tb, CTA_PROTOINFO_TCP_MAX, attr, tcp_nla_policy); |
1121 | if (err < 0) | |
1122 | return err; | |
c1d10adb | 1123 | |
df6fb868 | 1124 | if (!tb[CTA_PROTOINFO_TCP_STATE]) |
c1d10adb PNA |
1125 | return -EINVAL; |
1126 | ||
1127 | write_lock_bh(&tcp_lock); | |
601e68e1 | 1128 | ct->proto.tcp.state = |
df6fb868 | 1129 | *(u_int8_t *)nla_data(tb[CTA_PROTOINFO_TCP_STATE]); |
c8e2078c | 1130 | |
df6fb868 | 1131 | if (tb[CTA_PROTOINFO_TCP_FLAGS_ORIGINAL]) { |
c8e2078c | 1132 | struct nf_ct_tcp_flags *attr = |
df6fb868 | 1133 | nla_data(tb[CTA_PROTOINFO_TCP_FLAGS_ORIGINAL]); |
c8e2078c PNA |
1134 | ct->proto.tcp.seen[0].flags &= ~attr->mask; |
1135 | ct->proto.tcp.seen[0].flags |= attr->flags & attr->mask; | |
1136 | } | |
1137 | ||
df6fb868 | 1138 | if (tb[CTA_PROTOINFO_TCP_FLAGS_REPLY]) { |
c8e2078c | 1139 | struct nf_ct_tcp_flags *attr = |
df6fb868 | 1140 | nla_data(tb[CTA_PROTOINFO_TCP_FLAGS_REPLY]); |
c8e2078c PNA |
1141 | ct->proto.tcp.seen[1].flags &= ~attr->mask; |
1142 | ct->proto.tcp.seen[1].flags |= attr->flags & attr->mask; | |
1143 | } | |
1144 | ||
df6fb868 PM |
1145 | if (tb[CTA_PROTOINFO_TCP_WSCALE_ORIGINAL] && |
1146 | tb[CTA_PROTOINFO_TCP_WSCALE_REPLY] && | |
c8e2078c PNA |
1147 | ct->proto.tcp.seen[0].flags & IP_CT_TCP_FLAG_WINDOW_SCALE && |
1148 | ct->proto.tcp.seen[1].flags & IP_CT_TCP_FLAG_WINDOW_SCALE) { | |
1149 | ct->proto.tcp.seen[0].td_scale = *(u_int8_t *) | |
df6fb868 | 1150 | nla_data(tb[CTA_PROTOINFO_TCP_WSCALE_ORIGINAL]); |
c8e2078c | 1151 | ct->proto.tcp.seen[1].td_scale = *(u_int8_t *) |
df6fb868 | 1152 | nla_data(tb[CTA_PROTOINFO_TCP_WSCALE_REPLY]); |
c8e2078c | 1153 | } |
c1d10adb PNA |
1154 | write_unlock_bh(&tcp_lock); |
1155 | ||
1156 | return 0; | |
1157 | } | |
1158 | #endif | |
933a41e7 PM |
1159 | |
1160 | #ifdef CONFIG_SYSCTL | |
1161 | static unsigned int tcp_sysctl_table_users; | |
1162 | static struct ctl_table_header *tcp_sysctl_header; | |
1163 | static struct ctl_table tcp_sysctl_table[] = { | |
1164 | { | |
1165 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT, | |
1166 | .procname = "nf_conntrack_tcp_timeout_syn_sent", | |
1167 | .data = &nf_ct_tcp_timeout_syn_sent, | |
1168 | .maxlen = sizeof(unsigned int), | |
1169 | .mode = 0644, | |
1170 | .proc_handler = &proc_dointvec_jiffies, | |
1171 | }, | |
1172 | { | |
1173 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV, | |
1174 | .procname = "nf_conntrack_tcp_timeout_syn_recv", | |
1175 | .data = &nf_ct_tcp_timeout_syn_recv, | |
1176 | .maxlen = sizeof(unsigned int), | |
1177 | .mode = 0644, | |
1178 | .proc_handler = &proc_dointvec_jiffies, | |
1179 | }, | |
1180 | { | |
1181 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED, | |
1182 | .procname = "nf_conntrack_tcp_timeout_established", | |
1183 | .data = &nf_ct_tcp_timeout_established, | |
1184 | .maxlen = sizeof(unsigned int), | |
1185 | .mode = 0644, | |
1186 | .proc_handler = &proc_dointvec_jiffies, | |
1187 | }, | |
1188 | { | |
1189 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT, | |
1190 | .procname = "nf_conntrack_tcp_timeout_fin_wait", | |
1191 | .data = &nf_ct_tcp_timeout_fin_wait, | |
1192 | .maxlen = sizeof(unsigned int), | |
1193 | .mode = 0644, | |
1194 | .proc_handler = &proc_dointvec_jiffies, | |
1195 | }, | |
1196 | { | |
1197 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT, | |
1198 | .procname = "nf_conntrack_tcp_timeout_close_wait", | |
1199 | .data = &nf_ct_tcp_timeout_close_wait, | |
1200 | .maxlen = sizeof(unsigned int), | |
1201 | .mode = 0644, | |
1202 | .proc_handler = &proc_dointvec_jiffies, | |
1203 | }, | |
1204 | { | |
1205 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK, | |
1206 | .procname = "nf_conntrack_tcp_timeout_last_ack", | |
1207 | .data = &nf_ct_tcp_timeout_last_ack, | |
1208 | .maxlen = sizeof(unsigned int), | |
1209 | .mode = 0644, | |
1210 | .proc_handler = &proc_dointvec_jiffies, | |
1211 | }, | |
1212 | { | |
1213 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT, | |
1214 | .procname = "nf_conntrack_tcp_timeout_time_wait", | |
1215 | .data = &nf_ct_tcp_timeout_time_wait, | |
1216 | .maxlen = sizeof(unsigned int), | |
1217 | .mode = 0644, | |
1218 | .proc_handler = &proc_dointvec_jiffies, | |
1219 | }, | |
1220 | { | |
1221 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE, | |
1222 | .procname = "nf_conntrack_tcp_timeout_close", | |
1223 | .data = &nf_ct_tcp_timeout_close, | |
1224 | .maxlen = sizeof(unsigned int), | |
1225 | .mode = 0644, | |
1226 | .proc_handler = &proc_dointvec_jiffies, | |
1227 | }, | |
1228 | { | |
1229 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS, | |
1230 | .procname = "nf_conntrack_tcp_timeout_max_retrans", | |
1231 | .data = &nf_ct_tcp_timeout_max_retrans, | |
1232 | .maxlen = sizeof(unsigned int), | |
1233 | .mode = 0644, | |
1234 | .proc_handler = &proc_dointvec_jiffies, | |
1235 | }, | |
1236 | { | |
1237 | .ctl_name = NET_NF_CONNTRACK_TCP_LOOSE, | |
1238 | .procname = "nf_conntrack_tcp_loose", | |
1239 | .data = &nf_ct_tcp_loose, | |
1240 | .maxlen = sizeof(unsigned int), | |
1241 | .mode = 0644, | |
1242 | .proc_handler = &proc_dointvec, | |
1243 | }, | |
1244 | { | |
1245 | .ctl_name = NET_NF_CONNTRACK_TCP_BE_LIBERAL, | |
1246 | .procname = "nf_conntrack_tcp_be_liberal", | |
1247 | .data = &nf_ct_tcp_be_liberal, | |
1248 | .maxlen = sizeof(unsigned int), | |
1249 | .mode = 0644, | |
1250 | .proc_handler = &proc_dointvec, | |
1251 | }, | |
1252 | { | |
1253 | .ctl_name = NET_NF_CONNTRACK_TCP_MAX_RETRANS, | |
1254 | .procname = "nf_conntrack_tcp_max_retrans", | |
1255 | .data = &nf_ct_tcp_max_retrans, | |
1256 | .maxlen = sizeof(unsigned int), | |
1257 | .mode = 0644, | |
1258 | .proc_handler = &proc_dointvec, | |
1259 | }, | |
1260 | { | |
1261 | .ctl_name = 0 | |
1262 | } | |
1263 | }; | |
a999e683 PM |
1264 | |
1265 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT | |
1266 | static struct ctl_table tcp_compat_sysctl_table[] = { | |
1267 | { | |
1268 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT, | |
1269 | .procname = "ip_conntrack_tcp_timeout_syn_sent", | |
1270 | .data = &nf_ct_tcp_timeout_syn_sent, | |
1271 | .maxlen = sizeof(unsigned int), | |
1272 | .mode = 0644, | |
1273 | .proc_handler = &proc_dointvec_jiffies, | |
1274 | }, | |
1275 | { | |
1276 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV, | |
1277 | .procname = "ip_conntrack_tcp_timeout_syn_recv", | |
1278 | .data = &nf_ct_tcp_timeout_syn_recv, | |
1279 | .maxlen = sizeof(unsigned int), | |
1280 | .mode = 0644, | |
1281 | .proc_handler = &proc_dointvec_jiffies, | |
1282 | }, | |
1283 | { | |
1284 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED, | |
1285 | .procname = "ip_conntrack_tcp_timeout_established", | |
1286 | .data = &nf_ct_tcp_timeout_established, | |
1287 | .maxlen = sizeof(unsigned int), | |
1288 | .mode = 0644, | |
1289 | .proc_handler = &proc_dointvec_jiffies, | |
1290 | }, | |
1291 | { | |
1292 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT, | |
1293 | .procname = "ip_conntrack_tcp_timeout_fin_wait", | |
1294 | .data = &nf_ct_tcp_timeout_fin_wait, | |
1295 | .maxlen = sizeof(unsigned int), | |
1296 | .mode = 0644, | |
1297 | .proc_handler = &proc_dointvec_jiffies, | |
1298 | }, | |
1299 | { | |
1300 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT, | |
1301 | .procname = "ip_conntrack_tcp_timeout_close_wait", | |
1302 | .data = &nf_ct_tcp_timeout_close_wait, | |
1303 | .maxlen = sizeof(unsigned int), | |
1304 | .mode = 0644, | |
1305 | .proc_handler = &proc_dointvec_jiffies, | |
1306 | }, | |
1307 | { | |
1308 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK, | |
1309 | .procname = "ip_conntrack_tcp_timeout_last_ack", | |
1310 | .data = &nf_ct_tcp_timeout_last_ack, | |
1311 | .maxlen = sizeof(unsigned int), | |
1312 | .mode = 0644, | |
1313 | .proc_handler = &proc_dointvec_jiffies, | |
1314 | }, | |
1315 | { | |
1316 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT, | |
1317 | .procname = "ip_conntrack_tcp_timeout_time_wait", | |
1318 | .data = &nf_ct_tcp_timeout_time_wait, | |
1319 | .maxlen = sizeof(unsigned int), | |
1320 | .mode = 0644, | |
1321 | .proc_handler = &proc_dointvec_jiffies, | |
1322 | }, | |
1323 | { | |
1324 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE, | |
1325 | .procname = "ip_conntrack_tcp_timeout_close", | |
1326 | .data = &nf_ct_tcp_timeout_close, | |
1327 | .maxlen = sizeof(unsigned int), | |
1328 | .mode = 0644, | |
1329 | .proc_handler = &proc_dointvec_jiffies, | |
1330 | }, | |
1331 | { | |
1332 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS, | |
1333 | .procname = "ip_conntrack_tcp_timeout_max_retrans", | |
1334 | .data = &nf_ct_tcp_timeout_max_retrans, | |
1335 | .maxlen = sizeof(unsigned int), | |
1336 | .mode = 0644, | |
1337 | .proc_handler = &proc_dointvec_jiffies, | |
1338 | }, | |
1339 | { | |
1340 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_LOOSE, | |
1341 | .procname = "ip_conntrack_tcp_loose", | |
1342 | .data = &nf_ct_tcp_loose, | |
1343 | .maxlen = sizeof(unsigned int), | |
1344 | .mode = 0644, | |
1345 | .proc_handler = &proc_dointvec, | |
1346 | }, | |
1347 | { | |
1348 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL, | |
1349 | .procname = "ip_conntrack_tcp_be_liberal", | |
1350 | .data = &nf_ct_tcp_be_liberal, | |
1351 | .maxlen = sizeof(unsigned int), | |
1352 | .mode = 0644, | |
1353 | .proc_handler = &proc_dointvec, | |
1354 | }, | |
1355 | { | |
1356 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS, | |
1357 | .procname = "ip_conntrack_tcp_max_retrans", | |
1358 | .data = &nf_ct_tcp_max_retrans, | |
1359 | .maxlen = sizeof(unsigned int), | |
1360 | .mode = 0644, | |
1361 | .proc_handler = &proc_dointvec, | |
1362 | }, | |
1363 | { | |
1364 | .ctl_name = 0 | |
1365 | } | |
1366 | }; | |
1367 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ | |
933a41e7 PM |
1368 | #endif /* CONFIG_SYSCTL */ |
1369 | ||
61075af5 | 1370 | struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4 __read_mostly = |
9fb9cbb1 YK |
1371 | { |
1372 | .l3proto = PF_INET, | |
605dcad6 | 1373 | .l4proto = IPPROTO_TCP, |
9fb9cbb1 YK |
1374 | .name = "tcp", |
1375 | .pkt_to_tuple = tcp_pkt_to_tuple, | |
1376 | .invert_tuple = tcp_invert_tuple, | |
1377 | .print_tuple = tcp_print_tuple, | |
1378 | .print_conntrack = tcp_print_conntrack, | |
1379 | .packet = tcp_packet, | |
1380 | .new = tcp_new, | |
96f6bf82 | 1381 | .error = tcp_error, |
e281db5c | 1382 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
fdf70832 PM |
1383 | .to_nlattr = tcp_to_nlattr, |
1384 | .from_nlattr = nlattr_to_tcp, | |
1385 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, | |
1386 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, | |
f73e924c | 1387 | .nla_policy = nf_ct_port_nla_policy, |
c1d10adb | 1388 | #endif |
933a41e7 PM |
1389 | #ifdef CONFIG_SYSCTL |
1390 | .ctl_table_users = &tcp_sysctl_table_users, | |
1391 | .ctl_table_header = &tcp_sysctl_header, | |
1392 | .ctl_table = tcp_sysctl_table, | |
a999e683 PM |
1393 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
1394 | .ctl_compat_table = tcp_compat_sysctl_table, | |
1395 | #endif | |
933a41e7 | 1396 | #endif |
9fb9cbb1 | 1397 | }; |
13b18339 | 1398 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp4); |
9fb9cbb1 | 1399 | |
61075af5 | 1400 | struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6 __read_mostly = |
9fb9cbb1 YK |
1401 | { |
1402 | .l3proto = PF_INET6, | |
605dcad6 | 1403 | .l4proto = IPPROTO_TCP, |
9fb9cbb1 YK |
1404 | .name = "tcp", |
1405 | .pkt_to_tuple = tcp_pkt_to_tuple, | |
1406 | .invert_tuple = tcp_invert_tuple, | |
1407 | .print_tuple = tcp_print_tuple, | |
1408 | .print_conntrack = tcp_print_conntrack, | |
1409 | .packet = tcp_packet, | |
1410 | .new = tcp_new, | |
96f6bf82 | 1411 | .error = tcp_error, |
e281db5c | 1412 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
fdf70832 PM |
1413 | .to_nlattr = tcp_to_nlattr, |
1414 | .from_nlattr = nlattr_to_tcp, | |
1415 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, | |
1416 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, | |
f73e924c | 1417 | .nla_policy = nf_ct_port_nla_policy, |
c1d10adb | 1418 | #endif |
933a41e7 PM |
1419 | #ifdef CONFIG_SYSCTL |
1420 | .ctl_table_users = &tcp_sysctl_table_users, | |
1421 | .ctl_table_header = &tcp_sysctl_header, | |
1422 | .ctl_table = tcp_sysctl_table, | |
1423 | #endif | |
9fb9cbb1 | 1424 | }; |
13b18339 | 1425 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp6); |