aboutsummaryrefslogtreecommitdiffstats
path: root/net/ipv4/ipvs/ip_vs_proto_tcp.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/ipv4/ipvs/ip_vs_proto_tcp.c
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/ipv4/ipvs/ip_vs_proto_tcp.c')
-rw-r--r--net/ipv4/ipvs/ip_vs_proto_tcp.c640
1 files changed, 640 insertions, 0 deletions
diff --git a/net/ipv4/ipvs/ip_vs_proto_tcp.c b/net/ipv4/ipvs/ip_vs_proto_tcp.c
new file mode 100644
index 00000000000..e65de675da7
--- /dev/null
+++ b/net/ipv4/ipvs/ip_vs_proto_tcp.c
@@ -0,0 +1,640 @@
1/*
2 * ip_vs_proto_tcp.c: TCP load balancing support for IPVS
3 *
4 * Version: $Id: ip_vs_proto_tcp.c,v 1.3 2002/11/30 01:50:35 wensong Exp $
5 *
6 * Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
7 * Julian Anastasov <ja@ssi.bg>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 *
14 * Changes:
15 *
16 */
17
18#include <linux/kernel.h>
19#include <linux/ip.h>
20#include <linux/tcp.h> /* for tcphdr */
21#include <net/ip.h>
22#include <net/tcp.h> /* for csum_tcpudp_magic */
23#include <linux/netfilter_ipv4.h>
24
25#include <net/ip_vs.h>
26
27
28static struct ip_vs_conn *
29tcp_conn_in_get(const struct sk_buff *skb, struct ip_vs_protocol *pp,
30 const struct iphdr *iph, unsigned int proto_off, int inverse)
31{
32 __u16 _ports[2], *pptr;
33
34 pptr = skb_header_pointer(skb, proto_off, sizeof(_ports), _ports);
35 if (pptr == NULL)
36 return NULL;
37
38 if (likely(!inverse)) {
39 return ip_vs_conn_in_get(iph->protocol,
40 iph->saddr, pptr[0],
41 iph->daddr, pptr[1]);
42 } else {
43 return ip_vs_conn_in_get(iph->protocol,
44 iph->daddr, pptr[1],
45 iph->saddr, pptr[0]);
46 }
47}
48
49static struct ip_vs_conn *
50tcp_conn_out_get(const struct sk_buff *skb, struct ip_vs_protocol *pp,
51 const struct iphdr *iph, unsigned int proto_off, int inverse)
52{
53 __u16 _ports[2], *pptr;
54
55 pptr = skb_header_pointer(skb, proto_off, sizeof(_ports), _ports);
56 if (pptr == NULL)
57 return NULL;
58
59 if (likely(!inverse)) {
60 return ip_vs_conn_out_get(iph->protocol,
61 iph->saddr, pptr[0],
62 iph->daddr, pptr[1]);
63 } else {
64 return ip_vs_conn_out_get(iph->protocol,
65 iph->daddr, pptr[1],
66 iph->saddr, pptr[0]);
67 }
68}
69
70
71static int
72tcp_conn_schedule(struct sk_buff *skb,
73 struct ip_vs_protocol *pp,
74 int *verdict, struct ip_vs_conn **cpp)
75{
76 struct ip_vs_service *svc;
77 struct tcphdr _tcph, *th;
78
79 th = skb_header_pointer(skb, skb->nh.iph->ihl*4,
80 sizeof(_tcph), &_tcph);
81 if (th == NULL) {
82 *verdict = NF_DROP;
83 return 0;
84 }
85
86 if (th->syn &&
87 (svc = ip_vs_service_get(skb->nfmark, skb->nh.iph->protocol,
88 skb->nh.iph->daddr, th->dest))) {
89 if (ip_vs_todrop()) {
90 /*
91 * It seems that we are very loaded.
92 * We have to drop this packet :(
93 */
94 ip_vs_service_put(svc);
95 *verdict = NF_DROP;
96 return 0;
97 }
98
99 /*
100 * Let the virtual server select a real server for the
101 * incoming connection, and create a connection entry.
102 */
103 *cpp = ip_vs_schedule(svc, skb);
104 if (!*cpp) {
105 *verdict = ip_vs_leave(svc, skb, pp);
106 return 0;
107 }
108 ip_vs_service_put(svc);
109 }
110 return 1;
111}
112
113
114static inline void
115tcp_fast_csum_update(struct tcphdr *tcph, u32 oldip, u32 newip,
116 u16 oldport, u16 newport)
117{
118 tcph->check =
119 ip_vs_check_diff(~oldip, newip,
120 ip_vs_check_diff(oldport ^ 0xFFFF,
121 newport, tcph->check));
122}
123
124
125static int
126tcp_snat_handler(struct sk_buff **pskb,
127 struct ip_vs_protocol *pp, struct ip_vs_conn *cp)
128{
129 struct tcphdr *tcph;
130 unsigned int tcphoff = (*pskb)->nh.iph->ihl * 4;
131
132 /* csum_check requires unshared skb */
133 if (!ip_vs_make_skb_writable(pskb, tcphoff+sizeof(*tcph)))
134 return 0;
135
136 if (unlikely(cp->app != NULL)) {
137 /* Some checks before mangling */
138 if (pp->csum_check && !pp->csum_check(*pskb, pp))
139 return 0;
140
141 /* Call application helper if needed */
142 if (!ip_vs_app_pkt_out(cp, pskb))
143 return 0;
144 }
145
146 tcph = (void *)(*pskb)->nh.iph + tcphoff;
147 tcph->source = cp->vport;
148
149 /* Adjust TCP checksums */
150 if (!cp->app) {
151 /* Only port and addr are changed, do fast csum update */
152 tcp_fast_csum_update(tcph, cp->daddr, cp->vaddr,
153 cp->dport, cp->vport);
154 if ((*pskb)->ip_summed == CHECKSUM_HW)
155 (*pskb)->ip_summed = CHECKSUM_NONE;
156 } else {
157 /* full checksum calculation */
158 tcph->check = 0;
159 (*pskb)->csum = skb_checksum(*pskb, tcphoff,
160 (*pskb)->len - tcphoff, 0);
161 tcph->check = csum_tcpudp_magic(cp->vaddr, cp->caddr,
162 (*pskb)->len - tcphoff,
163 cp->protocol,
164 (*pskb)->csum);
165 IP_VS_DBG(11, "O-pkt: %s O-csum=%d (+%zd)\n",
166 pp->name, tcph->check,
167 (char*)&(tcph->check) - (char*)tcph);
168 }
169 return 1;
170}
171
172
173static int
174tcp_dnat_handler(struct sk_buff **pskb,
175 struct ip_vs_protocol *pp, struct ip_vs_conn *cp)
176{
177 struct tcphdr *tcph;
178 unsigned int tcphoff = (*pskb)->nh.iph->ihl * 4;
179
180 /* csum_check requires unshared skb */
181 if (!ip_vs_make_skb_writable(pskb, tcphoff+sizeof(*tcph)))
182 return 0;
183
184 if (unlikely(cp->app != NULL)) {
185 /* Some checks before mangling */
186 if (pp->csum_check && !pp->csum_check(*pskb, pp))
187 return 0;
188
189 /*
190 * Attempt ip_vs_app call.
191 * It will fix ip_vs_conn and iph ack_seq stuff
192 */
193 if (!ip_vs_app_pkt_in(cp, pskb))
194 return 0;
195 }
196
197 tcph = (void *)(*pskb)->nh.iph + tcphoff;
198 tcph->dest = cp->dport;
199
200 /*
201 * Adjust TCP checksums
202 */
203 if (!cp->app) {
204 /* Only port and addr are changed, do fast csum update */
205 tcp_fast_csum_update(tcph, cp->vaddr, cp->daddr,
206 cp->vport, cp->dport);
207 if ((*pskb)->ip_summed == CHECKSUM_HW)
208 (*pskb)->ip_summed = CHECKSUM_NONE;
209 } else {
210 /* full checksum calculation */
211 tcph->check = 0;
212 (*pskb)->csum = skb_checksum(*pskb, tcphoff,
213 (*pskb)->len - tcphoff, 0);
214 tcph->check = csum_tcpudp_magic(cp->caddr, cp->daddr,
215 (*pskb)->len - tcphoff,
216 cp->protocol,
217 (*pskb)->csum);
218 (*pskb)->ip_summed = CHECKSUM_UNNECESSARY;
219 }
220 return 1;
221}
222
223
224static int
225tcp_csum_check(struct sk_buff *skb, struct ip_vs_protocol *pp)
226{
227 unsigned int tcphoff = skb->nh.iph->ihl*4;
228
229 switch (skb->ip_summed) {
230 case CHECKSUM_NONE:
231 skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0);
232 case CHECKSUM_HW:
233 if (csum_tcpudp_magic(skb->nh.iph->saddr, skb->nh.iph->daddr,
234 skb->len - tcphoff,
235 skb->nh.iph->protocol, skb->csum)) {
236 IP_VS_DBG_RL_PKT(0, pp, skb, 0,
237 "Failed checksum for");
238 return 0;
239 }
240 break;
241 default:
242 /* CHECKSUM_UNNECESSARY */
243 break;
244 }
245
246 return 1;
247}
248
249
250#define TCP_DIR_INPUT 0
251#define TCP_DIR_OUTPUT 4
252#define TCP_DIR_INPUT_ONLY 8
253
254static int tcp_state_off[IP_VS_DIR_LAST] = {
255 [IP_VS_DIR_INPUT] = TCP_DIR_INPUT,
256 [IP_VS_DIR_OUTPUT] = TCP_DIR_OUTPUT,
257 [IP_VS_DIR_INPUT_ONLY] = TCP_DIR_INPUT_ONLY,
258};
259
260/*
261 * Timeout table[state]
262 */
263static int tcp_timeouts[IP_VS_TCP_S_LAST+1] = {
264 [IP_VS_TCP_S_NONE] = 2*HZ,
265 [IP_VS_TCP_S_ESTABLISHED] = 15*60*HZ,
266 [IP_VS_TCP_S_SYN_SENT] = 2*60*HZ,
267 [IP_VS_TCP_S_SYN_RECV] = 1*60*HZ,
268 [IP_VS_TCP_S_FIN_WAIT] = 2*60*HZ,
269 [IP_VS_TCP_S_TIME_WAIT] = 2*60*HZ,
270 [IP_VS_TCP_S_CLOSE] = 10*HZ,
271 [IP_VS_TCP_S_CLOSE_WAIT] = 60*HZ,
272 [IP_VS_TCP_S_LAST_ACK] = 30*HZ,
273 [IP_VS_TCP_S_LISTEN] = 2*60*HZ,
274 [IP_VS_TCP_S_SYNACK] = 120*HZ,
275 [IP_VS_TCP_S_LAST] = 2*HZ,
276};
277
278
279#if 0
280
281/* FIXME: This is going to die */
282
283static int tcp_timeouts_dos[IP_VS_TCP_S_LAST+1] = {
284 [IP_VS_TCP_S_NONE] = 2*HZ,
285 [IP_VS_TCP_S_ESTABLISHED] = 8*60*HZ,
286 [IP_VS_TCP_S_SYN_SENT] = 60*HZ,
287 [IP_VS_TCP_S_SYN_RECV] = 10*HZ,
288 [IP_VS_TCP_S_FIN_WAIT] = 60*HZ,
289 [IP_VS_TCP_S_TIME_WAIT] = 60*HZ,
290 [IP_VS_TCP_S_CLOSE] = 10*HZ,
291 [IP_VS_TCP_S_CLOSE_WAIT] = 60*HZ,
292 [IP_VS_TCP_S_LAST_ACK] = 30*HZ,
293 [IP_VS_TCP_S_LISTEN] = 2*60*HZ,
294 [IP_VS_TCP_S_SYNACK] = 100*HZ,
295 [IP_VS_TCP_S_LAST] = 2*HZ,
296};
297
298#endif
299
300static char * tcp_state_name_table[IP_VS_TCP_S_LAST+1] = {
301 [IP_VS_TCP_S_NONE] = "NONE",
302 [IP_VS_TCP_S_ESTABLISHED] = "ESTABLISHED",
303 [IP_VS_TCP_S_SYN_SENT] = "SYN_SENT",
304 [IP_VS_TCP_S_SYN_RECV] = "SYN_RECV",
305 [IP_VS_TCP_S_FIN_WAIT] = "FIN_WAIT",
306 [IP_VS_TCP_S_TIME_WAIT] = "TIME_WAIT",
307 [IP_VS_TCP_S_CLOSE] = "CLOSE",
308 [IP_VS_TCP_S_CLOSE_WAIT] = "CLOSE_WAIT",
309 [IP_VS_TCP_S_LAST_ACK] = "LAST_ACK",
310 [IP_VS_TCP_S_LISTEN] = "LISTEN",
311 [IP_VS_TCP_S_SYNACK] = "SYNACK",
312 [IP_VS_TCP_S_LAST] = "BUG!",
313};
314
315#define sNO IP_VS_TCP_S_NONE
316#define sES IP_VS_TCP_S_ESTABLISHED
317#define sSS IP_VS_TCP_S_SYN_SENT
318#define sSR IP_VS_TCP_S_SYN_RECV
319#define sFW IP_VS_TCP_S_FIN_WAIT
320#define sTW IP_VS_TCP_S_TIME_WAIT
321#define sCL IP_VS_TCP_S_CLOSE
322#define sCW IP_VS_TCP_S_CLOSE_WAIT
323#define sLA IP_VS_TCP_S_LAST_ACK
324#define sLI IP_VS_TCP_S_LISTEN
325#define sSA IP_VS_TCP_S_SYNACK
326
327struct tcp_states_t {
328 int next_state[IP_VS_TCP_S_LAST];
329};
330
331static const char * tcp_state_name(int state)
332{
333 if (state >= IP_VS_TCP_S_LAST)
334 return "ERR!";
335 return tcp_state_name_table[state] ? tcp_state_name_table[state] : "?";
336}
337
338static struct tcp_states_t tcp_states [] = {
339/* INPUT */
340/* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */
341/*syn*/ {{sSR, sES, sES, sSR, sSR, sSR, sSR, sSR, sSR, sSR, sSR }},
342/*fin*/ {{sCL, sCW, sSS, sTW, sTW, sTW, sCL, sCW, sLA, sLI, sTW }},
343/*ack*/ {{sCL, sES, sSS, sES, sFW, sTW, sCL, sCW, sCL, sLI, sES }},
344/*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sSR }},
345
346/* OUTPUT */
347/* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */
348/*syn*/ {{sSS, sES, sSS, sSR, sSS, sSS, sSS, sSS, sSS, sLI, sSR }},
349/*fin*/ {{sTW, sFW, sSS, sTW, sFW, sTW, sCL, sTW, sLA, sLI, sTW }},
350/*ack*/ {{sES, sES, sSS, sES, sFW, sTW, sCL, sCW, sLA, sES, sES }},
351/*rst*/ {{sCL, sCL, sSS, sCL, sCL, sTW, sCL, sCL, sCL, sCL, sCL }},
352
353/* INPUT-ONLY */
354/* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */
355/*syn*/ {{sSR, sES, sES, sSR, sSR, sSR, sSR, sSR, sSR, sSR, sSR }},
356/*fin*/ {{sCL, sFW, sSS, sTW, sFW, sTW, sCL, sCW, sLA, sLI, sTW }},
357/*ack*/ {{sCL, sES, sSS, sES, sFW, sTW, sCL, sCW, sCL, sLI, sES }},
358/*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sCL }},
359};
360
361static struct tcp_states_t tcp_states_dos [] = {
362/* INPUT */
363/* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */
364/*syn*/ {{sSR, sES, sES, sSR, sSR, sSR, sSR, sSR, sSR, sSR, sSA }},
365/*fin*/ {{sCL, sCW, sSS, sTW, sTW, sTW, sCL, sCW, sLA, sLI, sSA }},
366/*ack*/ {{sCL, sES, sSS, sSR, sFW, sTW, sCL, sCW, sCL, sLI, sSA }},
367/*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sCL }},
368
369/* OUTPUT */
370/* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */
371/*syn*/ {{sSS, sES, sSS, sSA, sSS, sSS, sSS, sSS, sSS, sLI, sSA }},
372/*fin*/ {{sTW, sFW, sSS, sTW, sFW, sTW, sCL, sTW, sLA, sLI, sTW }},
373/*ack*/ {{sES, sES, sSS, sES, sFW, sTW, sCL, sCW, sLA, sES, sES }},
374/*rst*/ {{sCL, sCL, sSS, sCL, sCL, sTW, sCL, sCL, sCL, sCL, sCL }},
375
376/* INPUT-ONLY */
377/* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */
378/*syn*/ {{sSA, sES, sES, sSR, sSA, sSA, sSA, sSA, sSA, sSA, sSA }},
379/*fin*/ {{sCL, sFW, sSS, sTW, sFW, sTW, sCL, sCW, sLA, sLI, sTW }},
380/*ack*/ {{sCL, sES, sSS, sES, sFW, sTW, sCL, sCW, sCL, sLI, sES }},
381/*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sCL }},
382};
383
384static struct tcp_states_t *tcp_state_table = tcp_states;
385
386
387static void tcp_timeout_change(struct ip_vs_protocol *pp, int flags)
388{
389 int on = (flags & 1); /* secure_tcp */
390
391 /*
392 ** FIXME: change secure_tcp to independent sysctl var
393 ** or make it per-service or per-app because it is valid
394 ** for most if not for all of the applications. Something
395 ** like "capabilities" (flags) for each object.
396 */
397 tcp_state_table = (on? tcp_states_dos : tcp_states);
398}
399
400static int
401tcp_set_state_timeout(struct ip_vs_protocol *pp, char *sname, int to)
402{
403 return ip_vs_set_state_timeout(pp->timeout_table, IP_VS_TCP_S_LAST,
404 tcp_state_name_table, sname, to);
405}
406
407static inline int tcp_state_idx(struct tcphdr *th)
408{
409 if (th->rst)
410 return 3;
411 if (th->syn)
412 return 0;
413 if (th->fin)
414 return 1;
415 if (th->ack)
416 return 2;
417 return -1;
418}
419
420static inline void
421set_tcp_state(struct ip_vs_protocol *pp, struct ip_vs_conn *cp,
422 int direction, struct tcphdr *th)
423{
424 int state_idx;
425 int new_state = IP_VS_TCP_S_CLOSE;
426 int state_off = tcp_state_off[direction];
427
428 /*
429 * Update state offset to INPUT_ONLY if necessary
430 * or delete NO_OUTPUT flag if output packet detected
431 */
432 if (cp->flags & IP_VS_CONN_F_NOOUTPUT) {
433 if (state_off == TCP_DIR_OUTPUT)
434 cp->flags &= ~IP_VS_CONN_F_NOOUTPUT;
435 else
436 state_off = TCP_DIR_INPUT_ONLY;
437 }
438
439 if ((state_idx = tcp_state_idx(th)) < 0) {
440 IP_VS_DBG(8, "tcp_state_idx=%d!!!\n", state_idx);
441 goto tcp_state_out;
442 }
443
444 new_state = tcp_state_table[state_off+state_idx].next_state[cp->state];
445
446 tcp_state_out:
447 if (new_state != cp->state) {
448 struct ip_vs_dest *dest = cp->dest;
449
450 IP_VS_DBG(8, "%s %s [%c%c%c%c] %u.%u.%u.%u:%d->"
451 "%u.%u.%u.%u:%d state: %s->%s cnt:%d\n",
452 pp->name,
453 (state_off==TCP_DIR_OUTPUT)?"output ":"input ",
454 th->syn? 'S' : '.',
455 th->fin? 'F' : '.',
456 th->ack? 'A' : '.',
457 th->rst? 'R' : '.',
458 NIPQUAD(cp->daddr), ntohs(cp->dport),
459 NIPQUAD(cp->caddr), ntohs(cp->cport),
460 tcp_state_name(cp->state),
461 tcp_state_name(new_state),
462 atomic_read(&cp->refcnt));
463 if (dest) {
464 if (!(cp->flags & IP_VS_CONN_F_INACTIVE) &&
465 (new_state != IP_VS_TCP_S_ESTABLISHED)) {
466 atomic_dec(&dest->activeconns);
467 atomic_inc(&dest->inactconns);
468 cp->flags |= IP_VS_CONN_F_INACTIVE;
469 } else if ((cp->flags & IP_VS_CONN_F_INACTIVE) &&
470 (new_state == IP_VS_TCP_S_ESTABLISHED)) {
471 atomic_inc(&dest->activeconns);
472 atomic_dec(&dest->inactconns);
473 cp->flags &= ~IP_VS_CONN_F_INACTIVE;
474 }
475 }
476 }
477
478 cp->timeout = pp->timeout_table[cp->state = new_state];
479}
480
481
482/*
483 * Handle state transitions
484 */
485static int
486tcp_state_transition(struct ip_vs_conn *cp, int direction,
487 const struct sk_buff *skb,
488 struct ip_vs_protocol *pp)
489{
490 struct tcphdr _tcph, *th;
491
492 th = skb_header_pointer(skb, skb->nh.iph->ihl*4,
493 sizeof(_tcph), &_tcph);
494 if (th == NULL)
495 return 0;
496
497 spin_lock(&cp->lock);
498 set_tcp_state(pp, cp, direction, th);
499 spin_unlock(&cp->lock);
500
501 return 1;
502}
503
504
505/*
506 * Hash table for TCP application incarnations
507 */
508#define TCP_APP_TAB_BITS 4
509#define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
510#define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
511
512static struct list_head tcp_apps[TCP_APP_TAB_SIZE];
513static DEFINE_SPINLOCK(tcp_app_lock);
514
515static inline __u16 tcp_app_hashkey(__u16 port)
516{
517 return ((port >> TCP_APP_TAB_BITS) ^ port) & TCP_APP_TAB_MASK;
518}
519
520
521static int tcp_register_app(struct ip_vs_app *inc)
522{
523 struct ip_vs_app *i;
524 __u16 hash, port = inc->port;
525 int ret = 0;
526
527 hash = tcp_app_hashkey(port);
528
529 spin_lock_bh(&tcp_app_lock);
530 list_for_each_entry(i, &tcp_apps[hash], p_list) {
531 if (i->port == port) {
532 ret = -EEXIST;
533 goto out;
534 }
535 }
536 list_add(&inc->p_list, &tcp_apps[hash]);
537 atomic_inc(&ip_vs_protocol_tcp.appcnt);
538
539 out:
540 spin_unlock_bh(&tcp_app_lock);
541 return ret;
542}
543
544
545static void
546tcp_unregister_app(struct ip_vs_app *inc)
547{
548 spin_lock_bh(&tcp_app_lock);
549 atomic_dec(&ip_vs_protocol_tcp.appcnt);
550 list_del(&inc->p_list);
551 spin_unlock_bh(&tcp_app_lock);
552}
553
554
555static int
556tcp_app_conn_bind(struct ip_vs_conn *cp)
557{
558 int hash;
559 struct ip_vs_app *inc;
560 int result = 0;
561
562 /* Default binding: bind app only for NAT */
563 if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)
564 return 0;
565
566 /* Lookup application incarnations and bind the right one */
567 hash = tcp_app_hashkey(cp->vport);
568
569 spin_lock(&tcp_app_lock);
570 list_for_each_entry(inc, &tcp_apps[hash], p_list) {
571 if (inc->port == cp->vport) {
572 if (unlikely(!ip_vs_app_inc_get(inc)))
573 break;
574 spin_unlock(&tcp_app_lock);
575
576 IP_VS_DBG(9, "%s: Binding conn %u.%u.%u.%u:%u->"
577 "%u.%u.%u.%u:%u to app %s on port %u\n",
578 __FUNCTION__,
579 NIPQUAD(cp->caddr), ntohs(cp->cport),
580 NIPQUAD(cp->vaddr), ntohs(cp->vport),
581 inc->name, ntohs(inc->port));
582 cp->app = inc;
583 if (inc->init_conn)
584 result = inc->init_conn(inc, cp);
585 goto out;
586 }
587 }
588 spin_unlock(&tcp_app_lock);
589
590 out:
591 return result;
592}
593
594
595/*
596 * Set LISTEN timeout. (ip_vs_conn_put will setup timer)
597 */
598void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp)
599{
600 spin_lock(&cp->lock);
601 cp->state = IP_VS_TCP_S_LISTEN;
602 cp->timeout = ip_vs_protocol_tcp.timeout_table[IP_VS_TCP_S_LISTEN];
603 spin_unlock(&cp->lock);
604}
605
606
607static void tcp_init(struct ip_vs_protocol *pp)
608{
609 IP_VS_INIT_HASH_TABLE(tcp_apps);
610 pp->timeout_table = tcp_timeouts;
611}
612
613
614static void tcp_exit(struct ip_vs_protocol *pp)
615{
616}
617
618
619struct ip_vs_protocol ip_vs_protocol_tcp = {
620 .name = "TCP",
621 .protocol = IPPROTO_TCP,
622 .dont_defrag = 0,
623 .appcnt = ATOMIC_INIT(0),
624 .init = tcp_init,
625 .exit = tcp_exit,
626 .register_app = tcp_register_app,
627 .unregister_app = tcp_unregister_app,
628 .conn_schedule = tcp_conn_schedule,
629 .conn_in_get = tcp_conn_in_get,
630 .conn_out_get = tcp_conn_out_get,
631 .snat_handler = tcp_snat_handler,
632 .dnat_handler = tcp_dnat_handler,
633 .csum_check = tcp_csum_check,
634 .state_name = tcp_state_name,
635 .state_transition = tcp_state_transition,
636 .app_conn_bind = tcp_app_conn_bind,
637 .debug_packet = ip_vs_tcpudp_debug_packet,
638 .timeout_change = tcp_timeout_change,
639 .set_state_timeout = tcp_set_state_timeout,
640};
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-03 12:56:01 -0500