Commit | Line | Data |
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9fb9cbb1 YK |
1 | /* (C) 1999-2001 Paul `Rusty' Russell |
2 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
9fb9cbb1 YK |
7 | */ |
8 | ||
9fb9cbb1 | 9 | #include <linux/types.h> |
9fb9cbb1 | 10 | #include <linux/timer.h> |
9fb9cbb1 YK |
11 | #include <linux/module.h> |
12 | #include <linux/in.h> | |
13 | #include <linux/tcp.h> | |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/skbuff.h> | |
16 | #include <linux/ipv6.h> | |
17 | #include <net/ip6_checksum.h> | |
534f81a5 | 18 | #include <asm/unaligned.h> |
9fb9cbb1 YK |
19 | |
20 | #include <net/tcp.h> | |
21 | ||
22 | #include <linux/netfilter.h> | |
23 | #include <linux/netfilter_ipv4.h> | |
24 | #include <linux/netfilter_ipv6.h> | |
25 | #include <net/netfilter/nf_conntrack.h> | |
605dcad6 | 26 | #include <net/netfilter/nf_conntrack_l4proto.h> |
f6180121 | 27 | #include <net/netfilter/nf_conntrack_ecache.h> |
f01ffbd6 | 28 | #include <net/netfilter/nf_log.h> |
9d2493f8 CP |
29 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> |
30 | #include <net/netfilter/ipv6/nf_conntrack_ipv6.h> | |
9fb9cbb1 | 31 | |
c88130bc | 32 | /* Protects ct->proto.tcp */ |
9fb9cbb1 YK |
33 | static DEFINE_RWLOCK(tcp_lock); |
34 | ||
601e68e1 YH |
35 | /* "Be conservative in what you do, |
36 | be liberal in what you accept from others." | |
9fb9cbb1 | 37 | If it's non-zero, we mark only out of window RST segments as INVALID. */ |
3aef0fd9 | 38 | static int nf_ct_tcp_be_liberal __read_mostly = 0; |
9fb9cbb1 | 39 | |
a09113c2 | 40 | /* If it is set to zero, we disable picking up already established |
9fb9cbb1 | 41 | connections. */ |
3aef0fd9 | 42 | static int nf_ct_tcp_loose __read_mostly = 1; |
9fb9cbb1 | 43 | |
601e68e1 YH |
44 | /* Max number of the retransmitted packets without receiving an (acceptable) |
45 | ACK from the destination. If this number is reached, a shorter timer | |
9fb9cbb1 | 46 | will be started. */ |
3aef0fd9 | 47 | static int nf_ct_tcp_max_retrans __read_mostly = 3; |
9fb9cbb1 YK |
48 | |
49 | /* FIXME: Examine ipfilter's timeouts and conntrack transitions more | |
50 | closely. They're more complex. --RR */ | |
51 | ||
82f568fc | 52 | static const char *const tcp_conntrack_names[] = { |
9fb9cbb1 YK |
53 | "NONE", |
54 | "SYN_SENT", | |
55 | "SYN_RECV", | |
56 | "ESTABLISHED", | |
57 | "FIN_WAIT", | |
58 | "CLOSE_WAIT", | |
59 | "LAST_ACK", | |
60 | "TIME_WAIT", | |
61 | "CLOSE", | |
62 | "LISTEN" | |
63 | }; | |
601e68e1 | 64 | |
9fb9cbb1 YK |
65 | #define SECS * HZ |
66 | #define MINS * 60 SECS | |
67 | #define HOURS * 60 MINS | |
68 | #define DAYS * 24 HOURS | |
69 | ||
9fb9cbb1 | 70 | /* RFC1122 says the R2 limit should be at least 100 seconds. |
601e68e1 | 71 | Linux uses 15 packets as limit, which corresponds |
9fb9cbb1 | 72 | to ~13-30min depending on RTO. */ |
ae375044 PM |
73 | static unsigned int nf_ct_tcp_timeout_max_retrans __read_mostly = 5 MINS; |
74 | static unsigned int nf_ct_tcp_timeout_unacknowledged __read_mostly = 5 MINS; | |
601e68e1 | 75 | |
2d646286 PM |
76 | static unsigned int tcp_timeouts[TCP_CONNTRACK_MAX] __read_mostly = { |
77 | [TCP_CONNTRACK_SYN_SENT] = 2 MINS, | |
78 | [TCP_CONNTRACK_SYN_RECV] = 60 SECS, | |
79 | [TCP_CONNTRACK_ESTABLISHED] = 5 DAYS, | |
80 | [TCP_CONNTRACK_FIN_WAIT] = 2 MINS, | |
81 | [TCP_CONNTRACK_CLOSE_WAIT] = 60 SECS, | |
82 | [TCP_CONNTRACK_LAST_ACK] = 30 SECS, | |
83 | [TCP_CONNTRACK_TIME_WAIT] = 2 MINS, | |
84 | [TCP_CONNTRACK_CLOSE] = 10 SECS, | |
85 | }; | |
601e68e1 | 86 | |
9fb9cbb1 YK |
87 | #define sNO TCP_CONNTRACK_NONE |
88 | #define sSS TCP_CONNTRACK_SYN_SENT | |
89 | #define sSR TCP_CONNTRACK_SYN_RECV | |
90 | #define sES TCP_CONNTRACK_ESTABLISHED | |
91 | #define sFW TCP_CONNTRACK_FIN_WAIT | |
92 | #define sCW TCP_CONNTRACK_CLOSE_WAIT | |
93 | #define sLA TCP_CONNTRACK_LAST_ACK | |
94 | #define sTW TCP_CONNTRACK_TIME_WAIT | |
95 | #define sCL TCP_CONNTRACK_CLOSE | |
96 | #define sLI TCP_CONNTRACK_LISTEN | |
97 | #define sIV TCP_CONNTRACK_MAX | |
98 | #define sIG TCP_CONNTRACK_IGNORE | |
99 | ||
100 | /* What TCP flags are set from RST/SYN/FIN/ACK. */ | |
101 | enum tcp_bit_set { | |
102 | TCP_SYN_SET, | |
103 | TCP_SYNACK_SET, | |
104 | TCP_FIN_SET, | |
105 | TCP_ACK_SET, | |
106 | TCP_RST_SET, | |
107 | TCP_NONE_SET, | |
108 | }; | |
601e68e1 | 109 | |
9fb9cbb1 YK |
110 | /* |
111 | * The TCP state transition table needs a few words... | |
112 | * | |
113 | * We are the man in the middle. All the packets go through us | |
114 | * but might get lost in transit to the destination. | |
601e68e1 | 115 | * It is assumed that the destinations can't receive segments |
9fb9cbb1 YK |
116 | * we haven't seen. |
117 | * | |
118 | * The checked segment is in window, but our windows are *not* | |
119 | * equivalent with the ones of the sender/receiver. We always | |
120 | * try to guess the state of the current sender. | |
121 | * | |
122 | * The meaning of the states are: | |
123 | * | |
124 | * NONE: initial state | |
601e68e1 | 125 | * SYN_SENT: SYN-only packet seen |
9fb9cbb1 YK |
126 | * SYN_RECV: SYN-ACK packet seen |
127 | * ESTABLISHED: ACK packet seen | |
128 | * FIN_WAIT: FIN packet seen | |
601e68e1 | 129 | * CLOSE_WAIT: ACK seen (after FIN) |
9fb9cbb1 YK |
130 | * LAST_ACK: FIN seen (after FIN) |
131 | * TIME_WAIT: last ACK seen | |
b2155e7f | 132 | * CLOSE: closed connection (RST) |
9fb9cbb1 YK |
133 | * |
134 | * LISTEN state is not used. | |
135 | * | |
136 | * Packets marked as IGNORED (sIG): | |
601e68e1 YH |
137 | * if they may be either invalid or valid |
138 | * and the receiver may send back a connection | |
9fb9cbb1 YK |
139 | * closing RST or a SYN/ACK. |
140 | * | |
141 | * Packets marked as INVALID (sIV): | |
142 | * if they are invalid | |
143 | * or we do not support the request (simultaneous open) | |
144 | */ | |
a5e73c29 | 145 | static const u8 tcp_conntracks[2][6][TCP_CONNTRACK_MAX] = { |
9fb9cbb1 YK |
146 | { |
147 | /* ORIGINAL */ | |
148 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
149 | /*syn*/ { sSS, sSS, sIG, sIG, sIG, sIG, sIG, sSS, sSS, sIV }, | |
150 | /* | |
151 | * sNO -> sSS Initialize a new connection | |
152 | * sSS -> sSS Retransmitted SYN | |
153 | * sSR -> sIG Late retransmitted SYN? | |
154 | * sES -> sIG Error: SYNs in window outside the SYN_SENT state | |
601e68e1 | 155 | * are errors. Receiver will reply with RST |
9fb9cbb1 YK |
156 | * and close the connection. |
157 | * Or we are not in sync and hold a dead connection. | |
158 | * sFW -> sIG | |
159 | * sCW -> sIG | |
160 | * sLA -> sIG | |
161 | * sTW -> sSS Reopened connection (RFC 1122). | |
162 | * sCL -> sSS | |
163 | */ | |
164 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
165 | /*synack*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV }, | |
166 | /* | |
167 | * A SYN/ACK from the client is always invalid: | |
601e68e1 | 168 | * - either it tries to set up a simultaneous open, which is |
9fb9cbb1 YK |
169 | * not supported; |
170 | * - or the firewall has just been inserted between the two hosts | |
601e68e1 | 171 | * during the session set-up. The SYN will be retransmitted |
9fb9cbb1 YK |
172 | * by the true client (or it'll time out). |
173 | */ | |
174 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
175 | /*fin*/ { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV }, | |
176 | /* | |
177 | * sNO -> sIV Too late and no reason to do anything... | |
178 | * sSS -> sIV Client migth not send FIN in this state: | |
179 | * we enforce waiting for a SYN/ACK reply first. | |
180 | * sSR -> sFW Close started. | |
181 | * sES -> sFW | |
182 | * sFW -> sLA FIN seen in both directions, waiting for | |
601e68e1 | 183 | * the last ACK. |
9fb9cbb1 YK |
184 | * Migth be a retransmitted FIN as well... |
185 | * sCW -> sLA | |
186 | * sLA -> sLA Retransmitted FIN. Remain in the same state. | |
187 | * sTW -> sTW | |
188 | * sCL -> sCL | |
189 | */ | |
190 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
191 | /*ack*/ { sES, sIV, sES, sES, sCW, sCW, sTW, sTW, sCL, sIV }, | |
192 | /* | |
193 | * sNO -> sES Assumed. | |
194 | * sSS -> sIV ACK is invalid: we haven't seen a SYN/ACK yet. | |
195 | * sSR -> sES Established state is reached. | |
196 | * sES -> sES :-) | |
197 | * sFW -> sCW Normal close request answered by ACK. | |
198 | * sCW -> sCW | |
199 | * sLA -> sTW Last ACK detected. | |
200 | * sTW -> sTW Retransmitted last ACK. Remain in the same state. | |
201 | * sCL -> sCL | |
202 | */ | |
203 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
204 | /*rst*/ { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV }, | |
205 | /*none*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV } | |
206 | }, | |
207 | { | |
208 | /* REPLY */ | |
209 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
210 | /*syn*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV }, | |
211 | /* | |
212 | * sNO -> sIV Never reached. | |
213 | * sSS -> sIV Simultaneous open, not supported | |
214 | * sSR -> sIV Simultaneous open, not supported. | |
215 | * sES -> sIV Server may not initiate a connection. | |
216 | * sFW -> sIV | |
217 | * sCW -> sIV | |
218 | * sLA -> sIV | |
219 | * sTW -> sIV Reopened connection, but server may not do it. | |
220 | * sCL -> sIV | |
221 | */ | |
222 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
223 | /*synack*/ { sIV, sSR, sSR, sIG, sIG, sIG, sIG, sIG, sIG, sIV }, | |
224 | /* | |
225 | * sSS -> sSR Standard open. | |
226 | * sSR -> sSR Retransmitted SYN/ACK. | |
227 | * sES -> sIG Late retransmitted SYN/ACK? | |
228 | * sFW -> sIG Might be SYN/ACK answering ignored SYN | |
229 | * sCW -> sIG | |
230 | * sLA -> sIG | |
231 | * sTW -> sIG | |
232 | * sCL -> sIG | |
233 | */ | |
234 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
235 | /*fin*/ { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV }, | |
236 | /* | |
237 | * sSS -> sIV Server might not send FIN in this state. | |
238 | * sSR -> sFW Close started. | |
239 | * sES -> sFW | |
240 | * sFW -> sLA FIN seen in both directions. | |
241 | * sCW -> sLA | |
242 | * sLA -> sLA Retransmitted FIN. | |
243 | * sTW -> sTW | |
244 | * sCL -> sCL | |
245 | */ | |
246 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
73f30602 | 247 | /*ack*/ { sIV, sIG, sSR, sES, sCW, sCW, sTW, sTW, sCL, sIV }, |
9fb9cbb1 | 248 | /* |
73f30602 | 249 | * sSS -> sIG Might be a half-open connection. |
9fb9cbb1 YK |
250 | * sSR -> sSR Might answer late resent SYN. |
251 | * sES -> sES :-) | |
252 | * sFW -> sCW Normal close request answered by ACK. | |
253 | * sCW -> sCW | |
254 | * sLA -> sTW Last ACK detected. | |
255 | * sTW -> sTW Retransmitted last ACK. | |
256 | * sCL -> sCL | |
257 | */ | |
258 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ | |
259 | /*rst*/ { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV }, | |
260 | /*none*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV } | |
601e68e1 | 261 | } |
9fb9cbb1 YK |
262 | }; |
263 | ||
09f263cd JE |
264 | static bool tcp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff, |
265 | struct nf_conntrack_tuple *tuple) | |
9fb9cbb1 | 266 | { |
82f568fc JE |
267 | const struct tcphdr *hp; |
268 | struct tcphdr _hdr; | |
9fb9cbb1 YK |
269 | |
270 | /* Actually only need first 8 bytes. */ | |
271 | hp = skb_header_pointer(skb, dataoff, 8, &_hdr); | |
272 | if (hp == NULL) | |
09f263cd | 273 | return false; |
9fb9cbb1 YK |
274 | |
275 | tuple->src.u.tcp.port = hp->source; | |
276 | tuple->dst.u.tcp.port = hp->dest; | |
277 | ||
09f263cd | 278 | return true; |
9fb9cbb1 YK |
279 | } |
280 | ||
09f263cd JE |
281 | static bool tcp_invert_tuple(struct nf_conntrack_tuple *tuple, |
282 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 YK |
283 | { |
284 | tuple->src.u.tcp.port = orig->dst.u.tcp.port; | |
285 | tuple->dst.u.tcp.port = orig->src.u.tcp.port; | |
09f263cd | 286 | return true; |
9fb9cbb1 YK |
287 | } |
288 | ||
289 | /* Print out the per-protocol part of the tuple. */ | |
290 | static int tcp_print_tuple(struct seq_file *s, | |
291 | const struct nf_conntrack_tuple *tuple) | |
292 | { | |
293 | return seq_printf(s, "sport=%hu dport=%hu ", | |
294 | ntohs(tuple->src.u.tcp.port), | |
295 | ntohs(tuple->dst.u.tcp.port)); | |
296 | } | |
297 | ||
298 | /* Print out the private part of the conntrack. */ | |
c88130bc | 299 | static int tcp_print_conntrack(struct seq_file *s, const struct nf_conn *ct) |
9fb9cbb1 YK |
300 | { |
301 | enum tcp_conntrack state; | |
302 | ||
303 | read_lock_bh(&tcp_lock); | |
c88130bc | 304 | state = ct->proto.tcp.state; |
9fb9cbb1 YK |
305 | read_unlock_bh(&tcp_lock); |
306 | ||
307 | return seq_printf(s, "%s ", tcp_conntrack_names[state]); | |
308 | } | |
309 | ||
310 | static unsigned int get_conntrack_index(const struct tcphdr *tcph) | |
311 | { | |
312 | if (tcph->rst) return TCP_RST_SET; | |
313 | else if (tcph->syn) return (tcph->ack ? TCP_SYNACK_SET : TCP_SYN_SET); | |
314 | else if (tcph->fin) return TCP_FIN_SET; | |
315 | else if (tcph->ack) return TCP_ACK_SET; | |
316 | else return TCP_NONE_SET; | |
317 | } | |
318 | ||
319 | /* TCP connection tracking based on 'Real Stateful TCP Packet Filtering | |
320 | in IP Filter' by Guido van Rooij. | |
601e68e1 | 321 | |
9fb9cbb1 YK |
322 | http://www.nluug.nl/events/sane2000/papers.html |
323 | http://www.iae.nl/users/guido/papers/tcp_filtering.ps.gz | |
601e68e1 | 324 | |
9fb9cbb1 YK |
325 | The boundaries and the conditions are changed according to RFC793: |
326 | the packet must intersect the window (i.e. segments may be | |
327 | after the right or before the left edge) and thus receivers may ACK | |
328 | segments after the right edge of the window. | |
329 | ||
601e68e1 | 330 | td_maxend = max(sack + max(win,1)) seen in reply packets |
9fb9cbb1 YK |
331 | td_maxwin = max(max(win, 1)) + (sack - ack) seen in sent packets |
332 | td_maxwin += seq + len - sender.td_maxend | |
333 | if seq + len > sender.td_maxend | |
334 | td_end = max(seq + len) seen in sent packets | |
601e68e1 | 335 | |
9fb9cbb1 YK |
336 | I. Upper bound for valid data: seq <= sender.td_maxend |
337 | II. Lower bound for valid data: seq + len >= sender.td_end - receiver.td_maxwin | |
84ebe1cd JK |
338 | III. Upper bound for valid (s)ack: sack <= receiver.td_end |
339 | IV. Lower bound for valid (s)ack: sack >= receiver.td_end - MAXACKWINDOW | |
9fb9cbb1 | 340 | |
84ebe1cd JK |
341 | where sack is the highest right edge of sack block found in the packet |
342 | or ack in the case of packet without SACK option. | |
9fb9cbb1 | 343 | |
84ebe1cd | 344 | The upper bound limit for a valid (s)ack is not ignored - |
601e68e1 | 345 | we doesn't have to deal with fragments. |
9fb9cbb1 YK |
346 | */ |
347 | ||
348 | static inline __u32 segment_seq_plus_len(__u32 seq, | |
349 | size_t len, | |
350 | unsigned int dataoff, | |
82f568fc | 351 | const struct tcphdr *tcph) |
9fb9cbb1 YK |
352 | { |
353 | /* XXX Should I use payload length field in IP/IPv6 header ? | |
354 | * - YK */ | |
355 | return (seq + len - dataoff - tcph->doff*4 | |
356 | + (tcph->syn ? 1 : 0) + (tcph->fin ? 1 : 0)); | |
357 | } | |
601e68e1 | 358 | |
9fb9cbb1 YK |
359 | /* Fixme: what about big packets? */ |
360 | #define MAXACKWINCONST 66000 | |
361 | #define MAXACKWINDOW(sender) \ | |
362 | ((sender)->td_maxwin > MAXACKWINCONST ? (sender)->td_maxwin \ | |
363 | : MAXACKWINCONST) | |
601e68e1 | 364 | |
9fb9cbb1 YK |
365 | /* |
366 | * Simplified tcp_parse_options routine from tcp_input.c | |
367 | */ | |
368 | static void tcp_options(const struct sk_buff *skb, | |
369 | unsigned int dataoff, | |
82f568fc | 370 | const struct tcphdr *tcph, |
9fb9cbb1 YK |
371 | struct ip_ct_tcp_state *state) |
372 | { | |
373 | unsigned char buff[(15 * 4) - sizeof(struct tcphdr)]; | |
82f568fc | 374 | const unsigned char *ptr; |
9fb9cbb1 YK |
375 | int length = (tcph->doff*4) - sizeof(struct tcphdr); |
376 | ||
377 | if (!length) | |
378 | return; | |
379 | ||
380 | ptr = skb_header_pointer(skb, dataoff + sizeof(struct tcphdr), | |
381 | length, buff); | |
382 | BUG_ON(ptr == NULL); | |
383 | ||
601e68e1 | 384 | state->td_scale = |
9fb9cbb1 YK |
385 | state->flags = 0; |
386 | ||
387 | while (length > 0) { | |
388 | int opcode=*ptr++; | |
389 | int opsize; | |
390 | ||
391 | switch (opcode) { | |
392 | case TCPOPT_EOL: | |
393 | return; | |
394 | case TCPOPT_NOP: /* Ref: RFC 793 section 3.1 */ | |
395 | length--; | |
396 | continue; | |
397 | default: | |
398 | opsize=*ptr++; | |
399 | if (opsize < 2) /* "silly options" */ | |
400 | return; | |
401 | if (opsize > length) | |
402 | break; /* don't parse partial options */ | |
403 | ||
601e68e1 | 404 | if (opcode == TCPOPT_SACK_PERM |
9fb9cbb1 YK |
405 | && opsize == TCPOLEN_SACK_PERM) |
406 | state->flags |= IP_CT_TCP_FLAG_SACK_PERM; | |
407 | else if (opcode == TCPOPT_WINDOW | |
408 | && opsize == TCPOLEN_WINDOW) { | |
409 | state->td_scale = *(u_int8_t *)ptr; | |
410 | ||
411 | if (state->td_scale > 14) { | |
412 | /* See RFC1323 */ | |
413 | state->td_scale = 14; | |
414 | } | |
415 | state->flags |= | |
416 | IP_CT_TCP_FLAG_WINDOW_SCALE; | |
417 | } | |
418 | ptr += opsize - 2; | |
419 | length -= opsize; | |
420 | } | |
421 | } | |
422 | } | |
423 | ||
424 | static void tcp_sack(const struct sk_buff *skb, unsigned int dataoff, | |
82f568fc | 425 | const struct tcphdr *tcph, __u32 *sack) |
9fb9cbb1 | 426 | { |
601e68e1 | 427 | unsigned char buff[(15 * 4) - sizeof(struct tcphdr)]; |
82f568fc | 428 | const unsigned char *ptr; |
9fb9cbb1 YK |
429 | int length = (tcph->doff*4) - sizeof(struct tcphdr); |
430 | __u32 tmp; | |
431 | ||
432 | if (!length) | |
433 | return; | |
434 | ||
435 | ptr = skb_header_pointer(skb, dataoff + sizeof(struct tcphdr), | |
436 | length, buff); | |
437 | BUG_ON(ptr == NULL); | |
438 | ||
439 | /* Fast path for timestamp-only option */ | |
440 | if (length == TCPOLEN_TSTAMP_ALIGNED*4 | |
8f05ce91 YH |
441 | && *(__be32 *)ptr == htonl((TCPOPT_NOP << 24) |
442 | | (TCPOPT_NOP << 16) | |
443 | | (TCPOPT_TIMESTAMP << 8) | |
444 | | TCPOLEN_TIMESTAMP)) | |
9fb9cbb1 YK |
445 | return; |
446 | ||
447 | while (length > 0) { | |
448 | int opcode = *ptr++; | |
449 | int opsize, i; | |
450 | ||
451 | switch (opcode) { | |
452 | case TCPOPT_EOL: | |
453 | return; | |
454 | case TCPOPT_NOP: /* Ref: RFC 793 section 3.1 */ | |
455 | length--; | |
456 | continue; | |
457 | default: | |
458 | opsize = *ptr++; | |
459 | if (opsize < 2) /* "silly options" */ | |
460 | return; | |
461 | if (opsize > length) | |
462 | break; /* don't parse partial options */ | |
463 | ||
601e68e1 YH |
464 | if (opcode == TCPOPT_SACK |
465 | && opsize >= (TCPOLEN_SACK_BASE | |
466 | + TCPOLEN_SACK_PERBLOCK) | |
467 | && !((opsize - TCPOLEN_SACK_BASE) | |
468 | % TCPOLEN_SACK_PERBLOCK)) { | |
469 | for (i = 0; | |
470 | i < (opsize - TCPOLEN_SACK_BASE); | |
471 | i += TCPOLEN_SACK_PERBLOCK) { | |
534f81a5 | 472 | tmp = get_unaligned_be32((__be32 *)(ptr+i)+1); |
9fb9cbb1 YK |
473 | |
474 | if (after(tmp, *sack)) | |
475 | *sack = tmp; | |
476 | } | |
477 | return; | |
478 | } | |
479 | ptr += opsize - 2; | |
480 | length -= opsize; | |
481 | } | |
482 | } | |
483 | } | |
484 | ||
09f263cd JE |
485 | static bool tcp_in_window(const struct nf_conn *ct, |
486 | struct ip_ct_tcp *state, | |
487 | enum ip_conntrack_dir dir, | |
488 | unsigned int index, | |
489 | const struct sk_buff *skb, | |
490 | unsigned int dataoff, | |
491 | const struct tcphdr *tcph, | |
76108cea | 492 | u_int8_t pf) |
9fb9cbb1 | 493 | { |
c2a2c7e0 | 494 | struct net *net = nf_ct_net(ct); |
9fb9cbb1 YK |
495 | struct ip_ct_tcp_state *sender = &state->seen[dir]; |
496 | struct ip_ct_tcp_state *receiver = &state->seen[!dir]; | |
82f568fc | 497 | const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple; |
9fb9cbb1 | 498 | __u32 seq, ack, sack, end, win, swin; |
09f263cd | 499 | bool res; |
9fb9cbb1 YK |
500 | |
501 | /* | |
502 | * Get the required data from the packet. | |
503 | */ | |
504 | seq = ntohl(tcph->seq); | |
505 | ack = sack = ntohl(tcph->ack_seq); | |
506 | win = ntohs(tcph->window); | |
507 | end = segment_seq_plus_len(seq, skb->len, dataoff, tcph); | |
508 | ||
509 | if (receiver->flags & IP_CT_TCP_FLAG_SACK_PERM) | |
510 | tcp_sack(skb, dataoff, tcph, &sack); | |
511 | ||
0d53778e PM |
512 | pr_debug("tcp_in_window: START\n"); |
513 | pr_debug("tcp_in_window: "); | |
3c9fba65 | 514 | nf_ct_dump_tuple(tuple); |
0d53778e PM |
515 | pr_debug("seq=%u ack=%u sack=%u win=%u end=%u\n", |
516 | seq, ack, sack, win, end); | |
517 | pr_debug("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i " | |
518 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", | |
519 | sender->td_end, sender->td_maxend, sender->td_maxwin, | |
520 | sender->td_scale, | |
521 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, | |
522 | receiver->td_scale); | |
9fb9cbb1 YK |
523 | |
524 | if (sender->td_end == 0) { | |
525 | /* | |
526 | * Initialize sender data. | |
527 | */ | |
528 | if (tcph->syn && tcph->ack) { | |
529 | /* | |
530 | * Outgoing SYN-ACK in reply to a SYN. | |
531 | */ | |
601e68e1 | 532 | sender->td_end = |
9fb9cbb1 YK |
533 | sender->td_maxend = end; |
534 | sender->td_maxwin = (win == 0 ? 1 : win); | |
535 | ||
536 | tcp_options(skb, dataoff, tcph, sender); | |
601e68e1 | 537 | /* |
9fb9cbb1 YK |
538 | * RFC 1323: |
539 | * Both sides must send the Window Scale option | |
540 | * to enable window scaling in either direction. | |
541 | */ | |
542 | if (!(sender->flags & IP_CT_TCP_FLAG_WINDOW_SCALE | |
543 | && receiver->flags & IP_CT_TCP_FLAG_WINDOW_SCALE)) | |
601e68e1 | 544 | sender->td_scale = |
9fb9cbb1 YK |
545 | receiver->td_scale = 0; |
546 | } else { | |
547 | /* | |
548 | * We are in the middle of a connection, | |
549 | * its history is lost for us. | |
550 | * Let's try to use the data from the packet. | |
601e68e1 | 551 | */ |
9fb9cbb1 YK |
552 | sender->td_end = end; |
553 | sender->td_maxwin = (win == 0 ? 1 : win); | |
554 | sender->td_maxend = end + sender->td_maxwin; | |
555 | } | |
556 | } else if (((state->state == TCP_CONNTRACK_SYN_SENT | |
557 | && dir == IP_CT_DIR_ORIGINAL) | |
558 | || (state->state == TCP_CONNTRACK_SYN_RECV | |
559 | && dir == IP_CT_DIR_REPLY)) | |
560 | && after(end, sender->td_end)) { | |
561 | /* | |
562 | * RFC 793: "if a TCP is reinitialized ... then it need | |
601e68e1 | 563 | * not wait at all; it must only be sure to use sequence |
9fb9cbb1 YK |
564 | * numbers larger than those recently used." |
565 | */ | |
566 | sender->td_end = | |
567 | sender->td_maxend = end; | |
568 | sender->td_maxwin = (win == 0 ? 1 : win); | |
569 | ||
570 | tcp_options(skb, dataoff, tcph, sender); | |
571 | } | |
572 | ||
573 | if (!(tcph->ack)) { | |
574 | /* | |
575 | * If there is no ACK, just pretend it was set and OK. | |
576 | */ | |
577 | ack = sack = receiver->td_end; | |
601e68e1 YH |
578 | } else if (((tcp_flag_word(tcph) & (TCP_FLAG_ACK|TCP_FLAG_RST)) == |
579 | (TCP_FLAG_ACK|TCP_FLAG_RST)) | |
9fb9cbb1 YK |
580 | && (ack == 0)) { |
581 | /* | |
582 | * Broken TCP stacks, that set ACK in RST packets as well | |
583 | * with zero ack value. | |
584 | */ | |
585 | ack = sack = receiver->td_end; | |
586 | } | |
587 | ||
588 | if (seq == end | |
589 | && (!tcph->rst | |
590 | || (seq == 0 && state->state == TCP_CONNTRACK_SYN_SENT))) | |
591 | /* | |
592 | * Packets contains no data: we assume it is valid | |
593 | * and check the ack value only. | |
594 | * However RST segments are always validated by their | |
595 | * SEQ number, except when seq == 0 (reset sent answering | |
596 | * SYN. | |
597 | */ | |
598 | seq = end = sender->td_end; | |
599 | ||
0d53778e | 600 | pr_debug("tcp_in_window: "); |
3c9fba65 | 601 | nf_ct_dump_tuple(tuple); |
0d53778e PM |
602 | pr_debug("seq=%u ack=%u sack =%u win=%u end=%u\n", |
603 | seq, ack, sack, win, end); | |
604 | pr_debug("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i " | |
605 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", | |
606 | sender->td_end, sender->td_maxend, sender->td_maxwin, | |
607 | sender->td_scale, | |
608 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, | |
609 | receiver->td_scale); | |
610 | ||
611 | pr_debug("tcp_in_window: I=%i II=%i III=%i IV=%i\n", | |
612 | before(seq, sender->td_maxend + 1), | |
613 | after(end, sender->td_end - receiver->td_maxwin - 1), | |
614 | before(sack, receiver->td_end + 1), | |
84ebe1cd | 615 | after(sack, receiver->td_end - MAXACKWINDOW(sender) - 1)); |
9fb9cbb1 | 616 | |
a09113c2 PM |
617 | if (before(seq, sender->td_maxend + 1) && |
618 | after(end, sender->td_end - receiver->td_maxwin - 1) && | |
619 | before(sack, receiver->td_end + 1) && | |
84ebe1cd | 620 | after(sack, receiver->td_end - MAXACKWINDOW(sender) - 1)) { |
601e68e1 | 621 | /* |
9fb9cbb1 YK |
622 | * Take into account window scaling (RFC 1323). |
623 | */ | |
624 | if (!tcph->syn) | |
625 | win <<= sender->td_scale; | |
626 | ||
627 | /* | |
628 | * Update sender data. | |
629 | */ | |
630 | swin = win + (sack - ack); | |
631 | if (sender->td_maxwin < swin) | |
632 | sender->td_maxwin = swin; | |
ae375044 | 633 | if (after(end, sender->td_end)) { |
9fb9cbb1 | 634 | sender->td_end = end; |
ae375044 PM |
635 | sender->flags |= IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED; |
636 | } | |
bfcaa502 JK |
637 | if (tcph->ack) { |
638 | if (!(sender->flags & IP_CT_TCP_FLAG_MAXACK_SET)) { | |
639 | sender->td_maxack = ack; | |
640 | sender->flags |= IP_CT_TCP_FLAG_MAXACK_SET; | |
641 | } else if (after(ack, sender->td_maxack)) | |
642 | sender->td_maxack = ack; | |
643 | } | |
644 | ||
9fb9cbb1 YK |
645 | /* |
646 | * Update receiver data. | |
647 | */ | |
648 | if (after(end, sender->td_maxend)) | |
649 | receiver->td_maxwin += end - sender->td_maxend; | |
650 | if (after(sack + win, receiver->td_maxend - 1)) { | |
651 | receiver->td_maxend = sack + win; | |
652 | if (win == 0) | |
653 | receiver->td_maxend++; | |
654 | } | |
ae375044 PM |
655 | if (ack == receiver->td_end) |
656 | receiver->flags &= ~IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED; | |
9fb9cbb1 | 657 | |
601e68e1 | 658 | /* |
9fb9cbb1 YK |
659 | * Check retransmissions. |
660 | */ | |
661 | if (index == TCP_ACK_SET) { | |
662 | if (state->last_dir == dir | |
663 | && state->last_seq == seq | |
664 | && state->last_ack == ack | |
c1fe3ca5 GH |
665 | && state->last_end == end |
666 | && state->last_win == win) | |
9fb9cbb1 YK |
667 | state->retrans++; |
668 | else { | |
669 | state->last_dir = dir; | |
670 | state->last_seq = seq; | |
671 | state->last_ack = ack; | |
672 | state->last_end = end; | |
c1fe3ca5 | 673 | state->last_win = win; |
9fb9cbb1 YK |
674 | state->retrans = 0; |
675 | } | |
676 | } | |
09f263cd | 677 | res = true; |
9fb9cbb1 | 678 | } else { |
09f263cd | 679 | res = false; |
a09113c2 PM |
680 | if (sender->flags & IP_CT_TCP_FLAG_BE_LIBERAL || |
681 | nf_ct_tcp_be_liberal) | |
09f263cd | 682 | res = true; |
c2a2c7e0 | 683 | if (!res && LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 YK |
684 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
685 | "nf_ct_tcp: %s ", | |
686 | before(seq, sender->td_maxend + 1) ? | |
687 | after(end, sender->td_end - receiver->td_maxwin - 1) ? | |
688 | before(sack, receiver->td_end + 1) ? | |
689 | after(ack, receiver->td_end - MAXACKWINDOW(sender)) ? "BUG" | |
690 | : "ACK is under the lower bound (possible overly delayed ACK)" | |
691 | : "ACK is over the upper bound (ACKed data not seen yet)" | |
692 | : "SEQ is under the lower bound (already ACKed data retransmitted)" | |
693 | : "SEQ is over the upper bound (over the window of the receiver)"); | |
601e68e1 YH |
694 | } |
695 | ||
09f263cd | 696 | pr_debug("tcp_in_window: res=%u sender end=%u maxend=%u maxwin=%u " |
0d53778e PM |
697 | "receiver end=%u maxend=%u maxwin=%u\n", |
698 | res, sender->td_end, sender->td_maxend, sender->td_maxwin, | |
699 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin); | |
9fb9cbb1 YK |
700 | |
701 | return res; | |
702 | } | |
703 | ||
5b1158e9 | 704 | #ifdef CONFIG_NF_NAT_NEEDED |
9fb9cbb1 YK |
705 | /* Update sender->td_end after NAT successfully mangled the packet */ |
706 | /* Caller must linearize skb at tcp header. */ | |
82f568fc | 707 | void nf_conntrack_tcp_update(const struct sk_buff *skb, |
9fb9cbb1 | 708 | unsigned int dataoff, |
c88130bc | 709 | struct nf_conn *ct, |
9fb9cbb1 YK |
710 | int dir) |
711 | { | |
82f568fc JE |
712 | const struct tcphdr *tcph = (const void *)skb->data + dataoff; |
713 | const struct ip_ct_tcp_state *sender = &ct->proto.tcp.seen[dir]; | |
714 | const struct ip_ct_tcp_state *receiver = &ct->proto.tcp.seen[!dir]; | |
0d53778e | 715 | __u32 end; |
9fb9cbb1 YK |
716 | |
717 | end = segment_seq_plus_len(ntohl(tcph->seq), skb->len, dataoff, tcph); | |
718 | ||
719 | write_lock_bh(&tcp_lock); | |
720 | /* | |
721 | * We have to worry for the ack in the reply packet only... | |
722 | */ | |
c88130bc PM |
723 | if (after(end, ct->proto.tcp.seen[dir].td_end)) |
724 | ct->proto.tcp.seen[dir].td_end = end; | |
725 | ct->proto.tcp.last_end = end; | |
9fb9cbb1 | 726 | write_unlock_bh(&tcp_lock); |
0d53778e PM |
727 | pr_debug("tcp_update: sender end=%u maxend=%u maxwin=%u scale=%i " |
728 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", | |
729 | sender->td_end, sender->td_maxend, sender->td_maxwin, | |
730 | sender->td_scale, | |
731 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, | |
732 | receiver->td_scale); | |
9fb9cbb1 | 733 | } |
13b18339 | 734 | EXPORT_SYMBOL_GPL(nf_conntrack_tcp_update); |
9fb9cbb1 YK |
735 | #endif |
736 | ||
737 | #define TH_FIN 0x01 | |
738 | #define TH_SYN 0x02 | |
739 | #define TH_RST 0x04 | |
740 | #define TH_PUSH 0x08 | |
741 | #define TH_ACK 0x10 | |
742 | #define TH_URG 0x20 | |
743 | #define TH_ECE 0x40 | |
744 | #define TH_CWR 0x80 | |
745 | ||
5c8ce7c9 | 746 | /* table of valid flag combinations - PUSH, ECE and CWR are always valid */ |
82f568fc | 747 | static const u8 tcp_valid_flags[(TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG) + 1] = |
9fb9cbb1 YK |
748 | { |
749 | [TH_SYN] = 1, | |
d3ab4298 | 750 | [TH_SYN|TH_URG] = 1, |
d3ab4298 | 751 | [TH_SYN|TH_ACK] = 1, |
9fb9cbb1 YK |
752 | [TH_RST] = 1, |
753 | [TH_RST|TH_ACK] = 1, | |
9fb9cbb1 | 754 | [TH_FIN|TH_ACK] = 1, |
5c8ce7c9 | 755 | [TH_FIN|TH_ACK|TH_URG] = 1, |
9fb9cbb1 | 756 | [TH_ACK] = 1, |
9fb9cbb1 | 757 | [TH_ACK|TH_URG] = 1, |
9fb9cbb1 YK |
758 | }; |
759 | ||
760 | /* Protect conntrack agaist broken packets. Code taken from ipt_unclean.c. */ | |
74c51a14 AD |
761 | static int tcp_error(struct net *net, |
762 | struct sk_buff *skb, | |
9fb9cbb1 YK |
763 | unsigned int dataoff, |
764 | enum ip_conntrack_info *ctinfo, | |
76108cea | 765 | u_int8_t pf, |
96f6bf82 | 766 | unsigned int hooknum) |
9fb9cbb1 | 767 | { |
82f568fc JE |
768 | const struct tcphdr *th; |
769 | struct tcphdr _tcph; | |
9fb9cbb1 YK |
770 | unsigned int tcplen = skb->len - dataoff; |
771 | u_int8_t tcpflags; | |
772 | ||
773 | /* Smaller that minimal TCP header? */ | |
774 | th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph); | |
775 | if (th == NULL) { | |
c2a2c7e0 | 776 | if (LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 YK |
777 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
778 | "nf_ct_tcp: short packet "); | |
779 | return -NF_ACCEPT; | |
601e68e1 YH |
780 | } |
781 | ||
9fb9cbb1 YK |
782 | /* Not whole TCP header or malformed packet */ |
783 | if (th->doff*4 < sizeof(struct tcphdr) || tcplen < th->doff*4) { | |
c2a2c7e0 | 784 | if (LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 YK |
785 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
786 | "nf_ct_tcp: truncated/malformed packet "); | |
787 | return -NF_ACCEPT; | |
788 | } | |
601e68e1 | 789 | |
9fb9cbb1 YK |
790 | /* Checksum invalid? Ignore. |
791 | * We skip checking packets on the outgoing path | |
84fa7933 | 792 | * because the checksum is assumed to be correct. |
9fb9cbb1 YK |
793 | */ |
794 | /* FIXME: Source route IP option packets --RR */ | |
c04d0552 | 795 | if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING && |
96f6bf82 | 796 | nf_checksum(skb, hooknum, dataoff, IPPROTO_TCP, pf)) { |
c2a2c7e0 | 797 | if (LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 YK |
798 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
799 | "nf_ct_tcp: bad TCP checksum "); | |
800 | return -NF_ACCEPT; | |
801 | } | |
802 | ||
803 | /* Check TCP flags. */ | |
5c8ce7c9 | 804 | tcpflags = (((u_int8_t *)th)[13] & ~(TH_ECE|TH_CWR|TH_PUSH)); |
9fb9cbb1 | 805 | if (!tcp_valid_flags[tcpflags]) { |
c2a2c7e0 | 806 | if (LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 YK |
807 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
808 | "nf_ct_tcp: invalid TCP flag combination "); | |
809 | return -NF_ACCEPT; | |
810 | } | |
811 | ||
812 | return NF_ACCEPT; | |
813 | } | |
814 | ||
9fb9cbb1 | 815 | /* Returns verdict for packet, or -1 for invalid. */ |
c88130bc | 816 | static int tcp_packet(struct nf_conn *ct, |
9fb9cbb1 YK |
817 | const struct sk_buff *skb, |
818 | unsigned int dataoff, | |
819 | enum ip_conntrack_info ctinfo, | |
76108cea | 820 | u_int8_t pf, |
9fb9cbb1 YK |
821 | unsigned int hooknum) |
822 | { | |
c2a2c7e0 | 823 | struct net *net = nf_ct_net(ct); |
0d53778e | 824 | struct nf_conntrack_tuple *tuple; |
9fb9cbb1 YK |
825 | enum tcp_conntrack new_state, old_state; |
826 | enum ip_conntrack_dir dir; | |
82f568fc JE |
827 | const struct tcphdr *th; |
828 | struct tcphdr _tcph; | |
9fb9cbb1 YK |
829 | unsigned long timeout; |
830 | unsigned int index; | |
831 | ||
832 | th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph); | |
833 | BUG_ON(th == NULL); | |
834 | ||
835 | write_lock_bh(&tcp_lock); | |
c88130bc | 836 | old_state = ct->proto.tcp.state; |
9fb9cbb1 YK |
837 | dir = CTINFO2DIR(ctinfo); |
838 | index = get_conntrack_index(th); | |
839 | new_state = tcp_conntracks[dir][index][old_state]; | |
c88130bc | 840 | tuple = &ct->tuplehash[dir].tuple; |
9fb9cbb1 YK |
841 | |
842 | switch (new_state) { | |
17311393 JK |
843 | case TCP_CONNTRACK_SYN_SENT: |
844 | if (old_state < TCP_CONNTRACK_TIME_WAIT) | |
845 | break; | |
b2155e7f JK |
846 | /* RFC 1122: "When a connection is closed actively, |
847 | * it MUST linger in TIME-WAIT state for a time 2xMSL | |
848 | * (Maximum Segment Lifetime). However, it MAY accept | |
849 | * a new SYN from the remote TCP to reopen the connection | |
850 | * directly from TIME-WAIT state, if..." | |
851 | * We ignore the conditions because we are in the | |
852 | * TIME-WAIT state anyway. | |
853 | * | |
854 | * Handle aborted connections: we and the server | |
855 | * think there is an existing connection but the client | |
856 | * aborts it and starts a new one. | |
857 | */ | |
858 | if (((ct->proto.tcp.seen[dir].flags | |
859 | | ct->proto.tcp.seen[!dir].flags) | |
860 | & IP_CT_TCP_FLAG_CLOSE_INIT) | |
c88130bc PM |
861 | || (ct->proto.tcp.last_dir == dir |
862 | && ct->proto.tcp.last_index == TCP_RST_SET)) { | |
bc34b841 JK |
863 | /* Attempt to reopen a closed/aborted connection. |
864 | * Delete this connection and look up again. */ | |
17311393 | 865 | write_unlock_bh(&tcp_lock); |
2aec609f | 866 | |
6b69fe0c PM |
867 | /* Only repeat if we can actually remove the timer. |
868 | * Destruction may already be in progress in process | |
869 | * context and we must give it a chance to terminate. | |
870 | */ | |
2aec609f | 871 | if (nf_ct_kill(ct)) |
6b69fe0c | 872 | return -NF_REPEAT; |
ec8d5409 | 873 | return NF_DROP; |
17311393 JK |
874 | } |
875 | /* Fall through */ | |
9fb9cbb1 | 876 | case TCP_CONNTRACK_IGNORE: |
73f30602 | 877 | /* Ignored packets: |
b2155e7f JK |
878 | * |
879 | * Our connection entry may be out of sync, so ignore | |
880 | * packets which may signal the real connection between | |
881 | * the client and the server. | |
73f30602 JK |
882 | * |
883 | * a) SYN in ORIGINAL | |
884 | * b) SYN/ACK in REPLY | |
601e68e1 | 885 | * c) ACK in reply direction after initial SYN in original. |
b2155e7f JK |
886 | * |
887 | * If the ignored packet is invalid, the receiver will send | |
888 | * a RST we'll catch below. | |
73f30602 | 889 | */ |
9fb9cbb1 | 890 | if (index == TCP_SYNACK_SET |
c88130bc PM |
891 | && ct->proto.tcp.last_index == TCP_SYN_SET |
892 | && ct->proto.tcp.last_dir != dir | |
893 | && ntohl(th->ack_seq) == ct->proto.tcp.last_end) { | |
b2155e7f | 894 | /* b) This SYN/ACK acknowledges a SYN that we earlier |
9fb9cbb1 YK |
895 | * ignored as invalid. This means that the client and |
896 | * the server are both in sync, while the firewall is | |
897 | * not. We kill this session and block the SYN/ACK so | |
601e68e1 | 898 | * that the client cannot but retransmit its SYN and |
9fb9cbb1 YK |
899 | * thus initiate a clean new session. |
900 | */ | |
601e68e1 | 901 | write_unlock_bh(&tcp_lock); |
c2a2c7e0 | 902 | if (LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 YK |
903 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
904 | "nf_ct_tcp: killing out of sync session "); | |
51091764 | 905 | nf_ct_kill(ct); |
ec8d5409 | 906 | return NF_DROP; |
9fb9cbb1 | 907 | } |
c88130bc PM |
908 | ct->proto.tcp.last_index = index; |
909 | ct->proto.tcp.last_dir = dir; | |
910 | ct->proto.tcp.last_seq = ntohl(th->seq); | |
911 | ct->proto.tcp.last_end = | |
9fb9cbb1 YK |
912 | segment_seq_plus_len(ntohl(th->seq), skb->len, dataoff, th); |
913 | ||
914 | write_unlock_bh(&tcp_lock); | |
c2a2c7e0 | 915 | if (LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 | 916 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
b2155e7f | 917 | "nf_ct_tcp: invalid packet ignored "); |
9fb9cbb1 YK |
918 | return NF_ACCEPT; |
919 | case TCP_CONNTRACK_MAX: | |
920 | /* Invalid packet */ | |
0d53778e PM |
921 | pr_debug("nf_ct_tcp: Invalid dir=%i index=%u ostate=%u\n", |
922 | dir, get_conntrack_index(th), old_state); | |
9fb9cbb1 | 923 | write_unlock_bh(&tcp_lock); |
c2a2c7e0 | 924 | if (LOG_INVALID(net, IPPROTO_TCP)) |
9fb9cbb1 YK |
925 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
926 | "nf_ct_tcp: invalid state "); | |
927 | return -NF_ACCEPT; | |
9fb9cbb1 | 928 | case TCP_CONNTRACK_CLOSE: |
bfcaa502 JK |
929 | if (index == TCP_RST_SET |
930 | && (ct->proto.tcp.seen[!dir].flags & IP_CT_TCP_FLAG_MAXACK_SET) | |
931 | && before(ntohl(th->seq), ct->proto.tcp.seen[!dir].td_maxack)) { | |
932 | /* Invalid RST */ | |
933 | write_unlock_bh(&tcp_lock); | |
934 | if (LOG_INVALID(net, IPPROTO_TCP)) | |
935 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, | |
936 | "nf_ct_tcp: invalid RST "); | |
937 | return -NF_ACCEPT; | |
938 | } | |
9fb9cbb1 | 939 | if (index == TCP_RST_SET |
c88130bc PM |
940 | && ((test_bit(IPS_SEEN_REPLY_BIT, &ct->status) |
941 | && ct->proto.tcp.last_index == TCP_SYN_SET) | |
942 | || (!test_bit(IPS_ASSURED_BIT, &ct->status) | |
943 | && ct->proto.tcp.last_index == TCP_ACK_SET)) | |
944 | && ntohl(th->ack_seq) == ct->proto.tcp.last_end) { | |
93b1fae4 | 945 | /* RST sent to invalid SYN or ACK we had let through |
73f30602 JK |
946 | * at a) and c) above: |
947 | * | |
948 | * a) SYN was in window then | |
949 | * c) we hold a half-open connection. | |
950 | * | |
951 | * Delete our connection entry. | |
9fb9cbb1 | 952 | * We skip window checking, because packet might ACK |
73f30602 | 953 | * segments we ignored. */ |
9fb9cbb1 YK |
954 | goto in_window; |
955 | } | |
93b1fae4 | 956 | /* Just fall through */ |
9fb9cbb1 YK |
957 | default: |
958 | /* Keep compilers happy. */ | |
959 | break; | |
960 | } | |
961 | ||
c88130bc | 962 | if (!tcp_in_window(ct, &ct->proto.tcp, dir, index, |
9fb9cbb1 YK |
963 | skb, dataoff, th, pf)) { |
964 | write_unlock_bh(&tcp_lock); | |
965 | return -NF_ACCEPT; | |
966 | } | |
967 | in_window: | |
968 | /* From now on we have got in-window packets */ | |
c88130bc PM |
969 | ct->proto.tcp.last_index = index; |
970 | ct->proto.tcp.last_dir = dir; | |
9fb9cbb1 | 971 | |
0d53778e | 972 | pr_debug("tcp_conntracks: "); |
3c9fba65 | 973 | nf_ct_dump_tuple(tuple); |
0d53778e PM |
974 | pr_debug("syn=%i ack=%i fin=%i rst=%i old=%i new=%i\n", |
975 | (th->syn ? 1 : 0), (th->ack ? 1 : 0), | |
976 | (th->fin ? 1 : 0), (th->rst ? 1 : 0), | |
977 | old_state, new_state); | |
9fb9cbb1 | 978 | |
c88130bc | 979 | ct->proto.tcp.state = new_state; |
9fb9cbb1 | 980 | if (old_state != new_state |
d0c1fd7a | 981 | && new_state == TCP_CONNTRACK_FIN_WAIT) |
c88130bc | 982 | ct->proto.tcp.seen[dir].flags |= IP_CT_TCP_FLAG_CLOSE_INIT; |
ae375044 PM |
983 | |
984 | if (ct->proto.tcp.retrans >= nf_ct_tcp_max_retrans && | |
985 | tcp_timeouts[new_state] > nf_ct_tcp_timeout_max_retrans) | |
986 | timeout = nf_ct_tcp_timeout_max_retrans; | |
987 | else if ((ct->proto.tcp.seen[0].flags | ct->proto.tcp.seen[1].flags) & | |
988 | IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED && | |
989 | tcp_timeouts[new_state] > nf_ct_tcp_timeout_unacknowledged) | |
990 | timeout = nf_ct_tcp_timeout_unacknowledged; | |
991 | else | |
992 | timeout = tcp_timeouts[new_state]; | |
9fb9cbb1 YK |
993 | write_unlock_bh(&tcp_lock); |
994 | ||
a71996fc | 995 | nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, ct); |
9fb9cbb1 | 996 | if (new_state != old_state) |
a71996fc | 997 | nf_conntrack_event_cache(IPCT_PROTOINFO, ct); |
9fb9cbb1 | 998 | |
c88130bc | 999 | if (!test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { |
9fb9cbb1 YK |
1000 | /* If only reply is a RST, we can consider ourselves not to |
1001 | have an established connection: this is a fairly common | |
1002 | problem case, so we can delete the conntrack | |
1003 | immediately. --RR */ | |
1004 | if (th->rst) { | |
718d4ad9 | 1005 | nf_ct_kill_acct(ct, ctinfo, skb); |
9fb9cbb1 YK |
1006 | return NF_ACCEPT; |
1007 | } | |
c88130bc | 1008 | } else if (!test_bit(IPS_ASSURED_BIT, &ct->status) |
9fb9cbb1 YK |
1009 | && (old_state == TCP_CONNTRACK_SYN_RECV |
1010 | || old_state == TCP_CONNTRACK_ESTABLISHED) | |
1011 | && new_state == TCP_CONNTRACK_ESTABLISHED) { | |
601e68e1 YH |
1012 | /* Set ASSURED if we see see valid ack in ESTABLISHED |
1013 | after SYN_RECV or a valid answer for a picked up | |
9fb9cbb1 | 1014 | connection. */ |
c88130bc | 1015 | set_bit(IPS_ASSURED_BIT, &ct->status); |
a71996fc | 1016 | nf_conntrack_event_cache(IPCT_STATUS, ct); |
9fb9cbb1 | 1017 | } |
c88130bc | 1018 | nf_ct_refresh_acct(ct, ctinfo, skb, timeout); |
9fb9cbb1 YK |
1019 | |
1020 | return NF_ACCEPT; | |
1021 | } | |
601e68e1 | 1022 | |
9fb9cbb1 | 1023 | /* Called when a new connection for this protocol found. */ |
09f263cd JE |
1024 | static bool tcp_new(struct nf_conn *ct, const struct sk_buff *skb, |
1025 | unsigned int dataoff) | |
9fb9cbb1 YK |
1026 | { |
1027 | enum tcp_conntrack new_state; | |
82f568fc JE |
1028 | const struct tcphdr *th; |
1029 | struct tcphdr _tcph; | |
1030 | const struct ip_ct_tcp_state *sender = &ct->proto.tcp.seen[0]; | |
1031 | const struct ip_ct_tcp_state *receiver = &ct->proto.tcp.seen[1]; | |
9fb9cbb1 YK |
1032 | |
1033 | th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph); | |
1034 | BUG_ON(th == NULL); | |
1035 | ||
1036 | /* Don't need lock here: this conntrack not in circulation yet */ | |
1037 | new_state | |
1038 | = tcp_conntracks[0][get_conntrack_index(th)] | |
1039 | [TCP_CONNTRACK_NONE]; | |
1040 | ||
1041 | /* Invalid: delete conntrack */ | |
1042 | if (new_state >= TCP_CONNTRACK_MAX) { | |
0d53778e | 1043 | pr_debug("nf_ct_tcp: invalid new deleting.\n"); |
09f263cd | 1044 | return false; |
9fb9cbb1 YK |
1045 | } |
1046 | ||
1047 | if (new_state == TCP_CONNTRACK_SYN_SENT) { | |
1048 | /* SYN packet */ | |
c88130bc | 1049 | ct->proto.tcp.seen[0].td_end = |
9fb9cbb1 YK |
1050 | segment_seq_plus_len(ntohl(th->seq), skb->len, |
1051 | dataoff, th); | |
c88130bc PM |
1052 | ct->proto.tcp.seen[0].td_maxwin = ntohs(th->window); |
1053 | if (ct->proto.tcp.seen[0].td_maxwin == 0) | |
1054 | ct->proto.tcp.seen[0].td_maxwin = 1; | |
1055 | ct->proto.tcp.seen[0].td_maxend = | |
1056 | ct->proto.tcp.seen[0].td_end; | |
1057 | ||
1058 | tcp_options(skb, dataoff, th, &ct->proto.tcp.seen[0]); | |
1059 | ct->proto.tcp.seen[1].flags = 0; | |
9fb9cbb1 YK |
1060 | } else if (nf_ct_tcp_loose == 0) { |
1061 | /* Don't try to pick up connections. */ | |
09f263cd | 1062 | return false; |
9fb9cbb1 YK |
1063 | } else { |
1064 | /* | |
1065 | * We are in the middle of a connection, | |
1066 | * its history is lost for us. | |
1067 | * Let's try to use the data from the packet. | |
1068 | */ | |
c88130bc | 1069 | ct->proto.tcp.seen[0].td_end = |
9fb9cbb1 YK |
1070 | segment_seq_plus_len(ntohl(th->seq), skb->len, |
1071 | dataoff, th); | |
c88130bc PM |
1072 | ct->proto.tcp.seen[0].td_maxwin = ntohs(th->window); |
1073 | if (ct->proto.tcp.seen[0].td_maxwin == 0) | |
1074 | ct->proto.tcp.seen[0].td_maxwin = 1; | |
1075 | ct->proto.tcp.seen[0].td_maxend = | |
1076 | ct->proto.tcp.seen[0].td_end + | |
1077 | ct->proto.tcp.seen[0].td_maxwin; | |
1078 | ct->proto.tcp.seen[0].td_scale = 0; | |
9fb9cbb1 | 1079 | |
a09113c2 PM |
1080 | /* We assume SACK and liberal window checking to handle |
1081 | * window scaling */ | |
c88130bc PM |
1082 | ct->proto.tcp.seen[0].flags = |
1083 | ct->proto.tcp.seen[1].flags = IP_CT_TCP_FLAG_SACK_PERM | | |
1084 | IP_CT_TCP_FLAG_BE_LIBERAL; | |
9fb9cbb1 | 1085 | } |
601e68e1 | 1086 | |
c88130bc PM |
1087 | ct->proto.tcp.seen[1].td_end = 0; |
1088 | ct->proto.tcp.seen[1].td_maxend = 0; | |
1089 | ct->proto.tcp.seen[1].td_maxwin = 1; | |
1090 | ct->proto.tcp.seen[1].td_scale = 0; | |
9fb9cbb1 YK |
1091 | |
1092 | /* tcp_packet will set them */ | |
c88130bc PM |
1093 | ct->proto.tcp.state = TCP_CONNTRACK_NONE; |
1094 | ct->proto.tcp.last_index = TCP_NONE_SET; | |
601e68e1 | 1095 | |
0d53778e PM |
1096 | pr_debug("tcp_new: sender end=%u maxend=%u maxwin=%u scale=%i " |
1097 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", | |
1098 | sender->td_end, sender->td_maxend, sender->td_maxwin, | |
1099 | sender->td_scale, | |
1100 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, | |
1101 | receiver->td_scale); | |
09f263cd | 1102 | return true; |
9fb9cbb1 | 1103 | } |
c1d10adb | 1104 | |
e281db5c | 1105 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
c1d10adb PNA |
1106 | |
1107 | #include <linux/netfilter/nfnetlink.h> | |
1108 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
1109 | ||
fdf70832 | 1110 | static int tcp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, |
c1d10adb PNA |
1111 | const struct nf_conn *ct) |
1112 | { | |
df6fb868 | 1113 | struct nlattr *nest_parms; |
c8e2078c | 1114 | struct nf_ct_tcp_flags tmp = {}; |
601e68e1 | 1115 | |
c1d10adb | 1116 | read_lock_bh(&tcp_lock); |
df6fb868 PM |
1117 | nest_parms = nla_nest_start(skb, CTA_PROTOINFO_TCP | NLA_F_NESTED); |
1118 | if (!nest_parms) | |
1119 | goto nla_put_failure; | |
1120 | ||
77236b6e | 1121 | NLA_PUT_U8(skb, CTA_PROTOINFO_TCP_STATE, ct->proto.tcp.state); |
c8e2078c | 1122 | |
77236b6e PM |
1123 | NLA_PUT_U8(skb, CTA_PROTOINFO_TCP_WSCALE_ORIGINAL, |
1124 | ct->proto.tcp.seen[0].td_scale); | |
c8e2078c | 1125 | |
77236b6e PM |
1126 | NLA_PUT_U8(skb, CTA_PROTOINFO_TCP_WSCALE_REPLY, |
1127 | ct->proto.tcp.seen[1].td_scale); | |
c8e2078c PNA |
1128 | |
1129 | tmp.flags = ct->proto.tcp.seen[0].flags; | |
df6fb868 | 1130 | NLA_PUT(skb, CTA_PROTOINFO_TCP_FLAGS_ORIGINAL, |
c8e2078c PNA |
1131 | sizeof(struct nf_ct_tcp_flags), &tmp); |
1132 | ||
1133 | tmp.flags = ct->proto.tcp.seen[1].flags; | |
df6fb868 | 1134 | NLA_PUT(skb, CTA_PROTOINFO_TCP_FLAGS_REPLY, |
c8e2078c | 1135 | sizeof(struct nf_ct_tcp_flags), &tmp); |
c1d10adb PNA |
1136 | read_unlock_bh(&tcp_lock); |
1137 | ||
df6fb868 | 1138 | nla_nest_end(skb, nest_parms); |
c1d10adb PNA |
1139 | |
1140 | return 0; | |
1141 | ||
df6fb868 | 1142 | nla_put_failure: |
c1d10adb PNA |
1143 | read_unlock_bh(&tcp_lock); |
1144 | return -1; | |
1145 | } | |
1146 | ||
f73e924c PM |
1147 | static const struct nla_policy tcp_nla_policy[CTA_PROTOINFO_TCP_MAX+1] = { |
1148 | [CTA_PROTOINFO_TCP_STATE] = { .type = NLA_U8 }, | |
1149 | [CTA_PROTOINFO_TCP_WSCALE_ORIGINAL] = { .type = NLA_U8 }, | |
1150 | [CTA_PROTOINFO_TCP_WSCALE_REPLY] = { .type = NLA_U8 }, | |
1151 | [CTA_PROTOINFO_TCP_FLAGS_ORIGINAL] = { .len = sizeof(struct nf_ct_tcp_flags) }, | |
1152 | [CTA_PROTOINFO_TCP_FLAGS_REPLY] = { .len = sizeof(struct nf_ct_tcp_flags) }, | |
c1d10adb PNA |
1153 | }; |
1154 | ||
fdf70832 | 1155 | static int nlattr_to_tcp(struct nlattr *cda[], struct nf_conn *ct) |
c1d10adb | 1156 | { |
2f0d2f10 | 1157 | struct nlattr *pattr = cda[CTA_PROTOINFO_TCP]; |
df6fb868 | 1158 | struct nlattr *tb[CTA_PROTOINFO_TCP_MAX+1]; |
f73e924c | 1159 | int err; |
c1d10adb PNA |
1160 | |
1161 | /* updates could not contain anything about the private | |
1162 | * protocol info, in that case skip the parsing */ | |
2f0d2f10 | 1163 | if (!pattr) |
c1d10adb PNA |
1164 | return 0; |
1165 | ||
2f0d2f10 | 1166 | err = nla_parse_nested(tb, CTA_PROTOINFO_TCP_MAX, pattr, tcp_nla_policy); |
f73e924c PM |
1167 | if (err < 0) |
1168 | return err; | |
c1d10adb | 1169 | |
5f7da4d2 PM |
1170 | if (tb[CTA_PROTOINFO_TCP_STATE] && |
1171 | nla_get_u8(tb[CTA_PROTOINFO_TCP_STATE]) >= TCP_CONNTRACK_MAX) | |
c1d10adb PNA |
1172 | return -EINVAL; |
1173 | ||
1174 | write_lock_bh(&tcp_lock); | |
5f7da4d2 PM |
1175 | if (tb[CTA_PROTOINFO_TCP_STATE]) |
1176 | ct->proto.tcp.state = nla_get_u8(tb[CTA_PROTOINFO_TCP_STATE]); | |
c8e2078c | 1177 | |
df6fb868 | 1178 | if (tb[CTA_PROTOINFO_TCP_FLAGS_ORIGINAL]) { |
c8e2078c | 1179 | struct nf_ct_tcp_flags *attr = |
df6fb868 | 1180 | nla_data(tb[CTA_PROTOINFO_TCP_FLAGS_ORIGINAL]); |
c8e2078c PNA |
1181 | ct->proto.tcp.seen[0].flags &= ~attr->mask; |
1182 | ct->proto.tcp.seen[0].flags |= attr->flags & attr->mask; | |
1183 | } | |
1184 | ||
df6fb868 | 1185 | if (tb[CTA_PROTOINFO_TCP_FLAGS_REPLY]) { |
c8e2078c | 1186 | struct nf_ct_tcp_flags *attr = |
df6fb868 | 1187 | nla_data(tb[CTA_PROTOINFO_TCP_FLAGS_REPLY]); |
c8e2078c PNA |
1188 | ct->proto.tcp.seen[1].flags &= ~attr->mask; |
1189 | ct->proto.tcp.seen[1].flags |= attr->flags & attr->mask; | |
1190 | } | |
1191 | ||
df6fb868 PM |
1192 | if (tb[CTA_PROTOINFO_TCP_WSCALE_ORIGINAL] && |
1193 | tb[CTA_PROTOINFO_TCP_WSCALE_REPLY] && | |
c8e2078c PNA |
1194 | ct->proto.tcp.seen[0].flags & IP_CT_TCP_FLAG_WINDOW_SCALE && |
1195 | ct->proto.tcp.seen[1].flags & IP_CT_TCP_FLAG_WINDOW_SCALE) { | |
77236b6e PM |
1196 | ct->proto.tcp.seen[0].td_scale = |
1197 | nla_get_u8(tb[CTA_PROTOINFO_TCP_WSCALE_ORIGINAL]); | |
1198 | ct->proto.tcp.seen[1].td_scale = | |
1199 | nla_get_u8(tb[CTA_PROTOINFO_TCP_WSCALE_REPLY]); | |
c8e2078c | 1200 | } |
c1d10adb PNA |
1201 | write_unlock_bh(&tcp_lock); |
1202 | ||
1203 | return 0; | |
1204 | } | |
a400c30e HE |
1205 | |
1206 | static int tcp_nlattr_size(void) | |
1207 | { | |
1208 | return nla_total_size(0) /* CTA_PROTOINFO_TCP */ | |
1209 | + nla_policy_len(tcp_nla_policy, CTA_PROTOINFO_TCP_MAX + 1); | |
1210 | } | |
1211 | ||
1212 | static int tcp_nlattr_tuple_size(void) | |
1213 | { | |
1214 | return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1); | |
1215 | } | |
c1d10adb | 1216 | #endif |
933a41e7 PM |
1217 | |
1218 | #ifdef CONFIG_SYSCTL | |
1219 | static unsigned int tcp_sysctl_table_users; | |
1220 | static struct ctl_table_header *tcp_sysctl_header; | |
1221 | static struct ctl_table tcp_sysctl_table[] = { | |
1222 | { | |
933a41e7 | 1223 | .procname = "nf_conntrack_tcp_timeout_syn_sent", |
2d646286 | 1224 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_SENT], |
933a41e7 PM |
1225 | .maxlen = sizeof(unsigned int), |
1226 | .mode = 0644, | |
6d9f239a | 1227 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1228 | }, |
1229 | { | |
933a41e7 | 1230 | .procname = "nf_conntrack_tcp_timeout_syn_recv", |
2d646286 | 1231 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_RECV], |
933a41e7 PM |
1232 | .maxlen = sizeof(unsigned int), |
1233 | .mode = 0644, | |
6d9f239a | 1234 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1235 | }, |
1236 | { | |
933a41e7 | 1237 | .procname = "nf_conntrack_tcp_timeout_established", |
2d646286 | 1238 | .data = &tcp_timeouts[TCP_CONNTRACK_ESTABLISHED], |
933a41e7 PM |
1239 | .maxlen = sizeof(unsigned int), |
1240 | .mode = 0644, | |
6d9f239a | 1241 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1242 | }, |
1243 | { | |
933a41e7 | 1244 | .procname = "nf_conntrack_tcp_timeout_fin_wait", |
2d646286 | 1245 | .data = &tcp_timeouts[TCP_CONNTRACK_FIN_WAIT], |
933a41e7 PM |
1246 | .maxlen = sizeof(unsigned int), |
1247 | .mode = 0644, | |
6d9f239a | 1248 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1249 | }, |
1250 | { | |
933a41e7 | 1251 | .procname = "nf_conntrack_tcp_timeout_close_wait", |
2d646286 | 1252 | .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE_WAIT], |
933a41e7 PM |
1253 | .maxlen = sizeof(unsigned int), |
1254 | .mode = 0644, | |
6d9f239a | 1255 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1256 | }, |
1257 | { | |
933a41e7 | 1258 | .procname = "nf_conntrack_tcp_timeout_last_ack", |
2d646286 | 1259 | .data = &tcp_timeouts[TCP_CONNTRACK_LAST_ACK], |
933a41e7 PM |
1260 | .maxlen = sizeof(unsigned int), |
1261 | .mode = 0644, | |
6d9f239a | 1262 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1263 | }, |
1264 | { | |
933a41e7 | 1265 | .procname = "nf_conntrack_tcp_timeout_time_wait", |
2d646286 | 1266 | .data = &tcp_timeouts[TCP_CONNTRACK_TIME_WAIT], |
933a41e7 PM |
1267 | .maxlen = sizeof(unsigned int), |
1268 | .mode = 0644, | |
6d9f239a | 1269 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1270 | }, |
1271 | { | |
933a41e7 | 1272 | .procname = "nf_conntrack_tcp_timeout_close", |
2d646286 | 1273 | .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE], |
933a41e7 PM |
1274 | .maxlen = sizeof(unsigned int), |
1275 | .mode = 0644, | |
6d9f239a | 1276 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 PM |
1277 | }, |
1278 | { | |
933a41e7 PM |
1279 | .procname = "nf_conntrack_tcp_timeout_max_retrans", |
1280 | .data = &nf_ct_tcp_timeout_max_retrans, | |
1281 | .maxlen = sizeof(unsigned int), | |
1282 | .mode = 0644, | |
6d9f239a | 1283 | .proc_handler = proc_dointvec_jiffies, |
933a41e7 | 1284 | }, |
ae375044 PM |
1285 | { |
1286 | .procname = "nf_conntrack_tcp_timeout_unacknowledged", | |
1287 | .data = &nf_ct_tcp_timeout_unacknowledged, | |
1288 | .maxlen = sizeof(unsigned int), | |
1289 | .mode = 0644, | |
6d9f239a | 1290 | .proc_handler = proc_dointvec_jiffies, |
ae375044 | 1291 | }, |
933a41e7 PM |
1292 | { |
1293 | .ctl_name = NET_NF_CONNTRACK_TCP_LOOSE, | |
1294 | .procname = "nf_conntrack_tcp_loose", | |
1295 | .data = &nf_ct_tcp_loose, | |
1296 | .maxlen = sizeof(unsigned int), | |
1297 | .mode = 0644, | |
6d9f239a | 1298 | .proc_handler = proc_dointvec, |
933a41e7 PM |
1299 | }, |
1300 | { | |
1301 | .ctl_name = NET_NF_CONNTRACK_TCP_BE_LIBERAL, | |
1302 | .procname = "nf_conntrack_tcp_be_liberal", | |
1303 | .data = &nf_ct_tcp_be_liberal, | |
1304 | .maxlen = sizeof(unsigned int), | |
1305 | .mode = 0644, | |
6d9f239a | 1306 | .proc_handler = proc_dointvec, |
933a41e7 PM |
1307 | }, |
1308 | { | |
1309 | .ctl_name = NET_NF_CONNTRACK_TCP_MAX_RETRANS, | |
1310 | .procname = "nf_conntrack_tcp_max_retrans", | |
1311 | .data = &nf_ct_tcp_max_retrans, | |
1312 | .maxlen = sizeof(unsigned int), | |
1313 | .mode = 0644, | |
6d9f239a | 1314 | .proc_handler = proc_dointvec, |
933a41e7 PM |
1315 | }, |
1316 | { | |
1317 | .ctl_name = 0 | |
1318 | } | |
1319 | }; | |
a999e683 PM |
1320 | |
1321 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT | |
1322 | static struct ctl_table tcp_compat_sysctl_table[] = { | |
1323 | { | |
a999e683 | 1324 | .procname = "ip_conntrack_tcp_timeout_syn_sent", |
2d646286 | 1325 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_SENT], |
a999e683 PM |
1326 | .maxlen = sizeof(unsigned int), |
1327 | .mode = 0644, | |
6d9f239a | 1328 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1329 | }, |
1330 | { | |
a999e683 | 1331 | .procname = "ip_conntrack_tcp_timeout_syn_recv", |
2d646286 | 1332 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_RECV], |
a999e683 PM |
1333 | .maxlen = sizeof(unsigned int), |
1334 | .mode = 0644, | |
6d9f239a | 1335 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1336 | }, |
1337 | { | |
a999e683 | 1338 | .procname = "ip_conntrack_tcp_timeout_established", |
2d646286 | 1339 | .data = &tcp_timeouts[TCP_CONNTRACK_ESTABLISHED], |
a999e683 PM |
1340 | .maxlen = sizeof(unsigned int), |
1341 | .mode = 0644, | |
6d9f239a | 1342 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1343 | }, |
1344 | { | |
a999e683 | 1345 | .procname = "ip_conntrack_tcp_timeout_fin_wait", |
2d646286 | 1346 | .data = &tcp_timeouts[TCP_CONNTRACK_FIN_WAIT], |
a999e683 PM |
1347 | .maxlen = sizeof(unsigned int), |
1348 | .mode = 0644, | |
6d9f239a | 1349 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1350 | }, |
1351 | { | |
a999e683 | 1352 | .procname = "ip_conntrack_tcp_timeout_close_wait", |
2d646286 | 1353 | .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE_WAIT], |
a999e683 PM |
1354 | .maxlen = sizeof(unsigned int), |
1355 | .mode = 0644, | |
6d9f239a | 1356 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1357 | }, |
1358 | { | |
a999e683 | 1359 | .procname = "ip_conntrack_tcp_timeout_last_ack", |
2d646286 | 1360 | .data = &tcp_timeouts[TCP_CONNTRACK_LAST_ACK], |
a999e683 PM |
1361 | .maxlen = sizeof(unsigned int), |
1362 | .mode = 0644, | |
6d9f239a | 1363 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1364 | }, |
1365 | { | |
a999e683 | 1366 | .procname = "ip_conntrack_tcp_timeout_time_wait", |
2d646286 | 1367 | .data = &tcp_timeouts[TCP_CONNTRACK_TIME_WAIT], |
a999e683 PM |
1368 | .maxlen = sizeof(unsigned int), |
1369 | .mode = 0644, | |
6d9f239a | 1370 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1371 | }, |
1372 | { | |
a999e683 | 1373 | .procname = "ip_conntrack_tcp_timeout_close", |
2d646286 | 1374 | .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE], |
a999e683 PM |
1375 | .maxlen = sizeof(unsigned int), |
1376 | .mode = 0644, | |
6d9f239a | 1377 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1378 | }, |
1379 | { | |
a999e683 PM |
1380 | .procname = "ip_conntrack_tcp_timeout_max_retrans", |
1381 | .data = &nf_ct_tcp_timeout_max_retrans, | |
1382 | .maxlen = sizeof(unsigned int), | |
1383 | .mode = 0644, | |
6d9f239a | 1384 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
1385 | }, |
1386 | { | |
1387 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_LOOSE, | |
1388 | .procname = "ip_conntrack_tcp_loose", | |
1389 | .data = &nf_ct_tcp_loose, | |
1390 | .maxlen = sizeof(unsigned int), | |
1391 | .mode = 0644, | |
6d9f239a | 1392 | .proc_handler = proc_dointvec, |
a999e683 PM |
1393 | }, |
1394 | { | |
1395 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL, | |
1396 | .procname = "ip_conntrack_tcp_be_liberal", | |
1397 | .data = &nf_ct_tcp_be_liberal, | |
1398 | .maxlen = sizeof(unsigned int), | |
1399 | .mode = 0644, | |
6d9f239a | 1400 | .proc_handler = proc_dointvec, |
a999e683 PM |
1401 | }, |
1402 | { | |
1403 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS, | |
1404 | .procname = "ip_conntrack_tcp_max_retrans", | |
1405 | .data = &nf_ct_tcp_max_retrans, | |
1406 | .maxlen = sizeof(unsigned int), | |
1407 | .mode = 0644, | |
6d9f239a | 1408 | .proc_handler = proc_dointvec, |
a999e683 PM |
1409 | }, |
1410 | { | |
1411 | .ctl_name = 0 | |
1412 | } | |
1413 | }; | |
1414 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ | |
933a41e7 PM |
1415 | #endif /* CONFIG_SYSCTL */ |
1416 | ||
61075af5 | 1417 | struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4 __read_mostly = |
9fb9cbb1 YK |
1418 | { |
1419 | .l3proto = PF_INET, | |
605dcad6 | 1420 | .l4proto = IPPROTO_TCP, |
9fb9cbb1 YK |
1421 | .name = "tcp", |
1422 | .pkt_to_tuple = tcp_pkt_to_tuple, | |
1423 | .invert_tuple = tcp_invert_tuple, | |
1424 | .print_tuple = tcp_print_tuple, | |
1425 | .print_conntrack = tcp_print_conntrack, | |
1426 | .packet = tcp_packet, | |
1427 | .new = tcp_new, | |
96f6bf82 | 1428 | .error = tcp_error, |
e281db5c | 1429 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
fdf70832 | 1430 | .to_nlattr = tcp_to_nlattr, |
a400c30e | 1431 | .nlattr_size = tcp_nlattr_size, |
fdf70832 PM |
1432 | .from_nlattr = nlattr_to_tcp, |
1433 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, | |
1434 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, | |
a400c30e | 1435 | .nlattr_tuple_size = tcp_nlattr_tuple_size, |
f73e924c | 1436 | .nla_policy = nf_ct_port_nla_policy, |
c1d10adb | 1437 | #endif |
933a41e7 PM |
1438 | #ifdef CONFIG_SYSCTL |
1439 | .ctl_table_users = &tcp_sysctl_table_users, | |
1440 | .ctl_table_header = &tcp_sysctl_header, | |
1441 | .ctl_table = tcp_sysctl_table, | |
a999e683 PM |
1442 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
1443 | .ctl_compat_table = tcp_compat_sysctl_table, | |
1444 | #endif | |
933a41e7 | 1445 | #endif |
9fb9cbb1 | 1446 | }; |
13b18339 | 1447 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp4); |
9fb9cbb1 | 1448 | |
61075af5 | 1449 | struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6 __read_mostly = |
9fb9cbb1 YK |
1450 | { |
1451 | .l3proto = PF_INET6, | |
605dcad6 | 1452 | .l4proto = IPPROTO_TCP, |
9fb9cbb1 YK |
1453 | .name = "tcp", |
1454 | .pkt_to_tuple = tcp_pkt_to_tuple, | |
1455 | .invert_tuple = tcp_invert_tuple, | |
1456 | .print_tuple = tcp_print_tuple, | |
1457 | .print_conntrack = tcp_print_conntrack, | |
1458 | .packet = tcp_packet, | |
1459 | .new = tcp_new, | |
96f6bf82 | 1460 | .error = tcp_error, |
e281db5c | 1461 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
fdf70832 | 1462 | .to_nlattr = tcp_to_nlattr, |
a400c30e | 1463 | .nlattr_size = tcp_nlattr_size, |
fdf70832 PM |
1464 | .from_nlattr = nlattr_to_tcp, |
1465 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, | |
1466 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, | |
a400c30e | 1467 | .nlattr_tuple_size = tcp_nlattr_tuple_size, |
f73e924c | 1468 | .nla_policy = nf_ct_port_nla_policy, |
c1d10adb | 1469 | #endif |
933a41e7 PM |
1470 | #ifdef CONFIG_SYSCTL |
1471 | .ctl_table_users = &tcp_sysctl_table_users, | |
1472 | .ctl_table_header = &tcp_sysctl_header, | |
1473 | .ctl_table = tcp_sysctl_table, | |
1474 | #endif | |
9fb9cbb1 | 1475 | }; |
13b18339 | 1476 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp6); |