2 * ip_vs_proto_tcp.c: TCP load balancing support for IPVS
4 * Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
5 * Julian Anastasov <ja@ssi.bg>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
16 #define KMSG_COMPONENT "IPVS"
17 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
19 #include <linux/kernel.h>
21 #include <linux/tcp.h> /* for tcphdr */
23 #include <net/tcp.h> /* for csum_tcpudp_magic */
24 #include <net/ip6_checksum.h>
25 #include <linux/netfilter.h>
26 #include <linux/netfilter_ipv4.h>
28 #include <net/ip_vs.h>
31 static struct ip_vs_conn *
32 tcp_conn_in_get(int af, const struct sk_buff *skb, struct ip_vs_protocol *pp,
33 const struct ip_vs_iphdr *iph, unsigned int proto_off,
36 __be16 _ports[2], *pptr;
38 pptr = skb_header_pointer(skb, proto_off, sizeof(_ports), _ports);
42 if (likely(!inverse)) {
43 return ip_vs_conn_in_get(af, iph->protocol,
45 &iph->daddr, pptr[1]);
47 return ip_vs_conn_in_get(af, iph->protocol,
49 &iph->saddr, pptr[0]);
53 static struct ip_vs_conn *
54 tcp_conn_out_get(int af, const struct sk_buff *skb, struct ip_vs_protocol *pp,
55 const struct ip_vs_iphdr *iph, unsigned int proto_off,
58 __be16 _ports[2], *pptr;
60 pptr = skb_header_pointer(skb, proto_off, sizeof(_ports), _ports);
64 if (likely(!inverse)) {
65 return ip_vs_conn_out_get(af, iph->protocol,
67 &iph->daddr, pptr[1]);
69 return ip_vs_conn_out_get(af, iph->protocol,
71 &iph->saddr, pptr[0]);
77 tcp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_protocol *pp,
78 int *verdict, struct ip_vs_conn **cpp)
80 struct ip_vs_service *svc;
81 struct tcphdr _tcph, *th;
82 struct ip_vs_iphdr iph;
84 ip_vs_fill_iphdr(af, skb_network_header(skb), &iph);
86 th = skb_header_pointer(skb, iph.len, sizeof(_tcph), &_tcph);
93 (svc = ip_vs_service_get(af, skb->mark, iph.protocol, &iph.daddr,
97 * It seems that we are very loaded.
98 * We have to drop this packet :(
100 ip_vs_service_put(svc);
106 * Let the virtual server select a real server for the
107 * incoming connection, and create a connection entry.
109 *cpp = ip_vs_schedule(svc, skb);
111 *verdict = ip_vs_leave(svc, skb, pp);
114 ip_vs_service_put(svc);
121 tcp_fast_csum_update(int af, struct tcphdr *tcph,
122 const union nf_inet_addr *oldip,
123 const union nf_inet_addr *newip,
124 __be16 oldport, __be16 newport)
126 #ifdef CONFIG_IP_VS_IPV6
129 csum_fold(ip_vs_check_diff16(oldip->ip6, newip->ip6,
130 ip_vs_check_diff2(oldport, newport,
131 ~csum_unfold(tcph->check))));
135 csum_fold(ip_vs_check_diff4(oldip->ip, newip->ip,
136 ip_vs_check_diff2(oldport, newport,
137 ~csum_unfold(tcph->check))));
142 tcp_partial_csum_update(int af, struct tcphdr *tcph,
143 const union nf_inet_addr *oldip,
144 const union nf_inet_addr *newip,
145 __be16 oldlen, __be16 newlen)
147 #ifdef CONFIG_IP_VS_IPV6
150 csum_fold(ip_vs_check_diff16(oldip->ip6, newip->ip6,
151 ip_vs_check_diff2(oldlen, newlen,
152 ~csum_unfold(tcph->check))));
156 csum_fold(ip_vs_check_diff4(oldip->ip, newip->ip,
157 ip_vs_check_diff2(oldlen, newlen,
158 ~csum_unfold(tcph->check))));
163 tcp_snat_handler(struct sk_buff *skb,
164 struct ip_vs_protocol *pp, struct ip_vs_conn *cp)
167 unsigned int tcphoff;
170 #ifdef CONFIG_IP_VS_IPV6
171 if (cp->af == AF_INET6)
172 tcphoff = sizeof(struct ipv6hdr);
175 tcphoff = ip_hdrlen(skb);
176 oldlen = skb->len - tcphoff;
178 /* csum_check requires unshared skb */
179 if (!skb_make_writable(skb, tcphoff+sizeof(*tcph)))
182 if (unlikely(cp->app != NULL)) {
183 /* Some checks before mangling */
184 if (pp->csum_check && !pp->csum_check(cp->af, skb, pp))
187 /* Call application helper if needed */
188 if (!ip_vs_app_pkt_out(cp, skb))
192 tcph = (void *)skb_network_header(skb) + tcphoff;
193 tcph->source = cp->vport;
195 /* Adjust TCP checksums */
196 if (skb->ip_summed == CHECKSUM_PARTIAL) {
197 tcp_partial_csum_update(cp->af, tcph, &cp->daddr, &cp->vaddr,
199 htons(skb->len - tcphoff));
200 } else if (!cp->app) {
201 /* Only port and addr are changed, do fast csum update */
202 tcp_fast_csum_update(cp->af, tcph, &cp->daddr, &cp->vaddr,
203 cp->dport, cp->vport);
204 if (skb->ip_summed == CHECKSUM_COMPLETE)
205 skb->ip_summed = CHECKSUM_NONE;
207 /* full checksum calculation */
209 skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0);
210 #ifdef CONFIG_IP_VS_IPV6
211 if (cp->af == AF_INET6)
212 tcph->check = csum_ipv6_magic(&cp->vaddr.in6,
215 cp->protocol, skb->csum);
218 tcph->check = csum_tcpudp_magic(cp->vaddr.ip,
224 IP_VS_DBG(11, "O-pkt: %s O-csum=%d (+%zd)\n",
225 pp->name, tcph->check,
226 (char*)&(tcph->check) - (char*)tcph);
233 tcp_dnat_handler(struct sk_buff *skb,
234 struct ip_vs_protocol *pp, struct ip_vs_conn *cp)
237 unsigned int tcphoff;
240 #ifdef CONFIG_IP_VS_IPV6
241 if (cp->af == AF_INET6)
242 tcphoff = sizeof(struct ipv6hdr);
245 tcphoff = ip_hdrlen(skb);
246 oldlen = skb->len - tcphoff;
248 /* csum_check requires unshared skb */
249 if (!skb_make_writable(skb, tcphoff+sizeof(*tcph)))
252 if (unlikely(cp->app != NULL)) {
253 /* Some checks before mangling */
254 if (pp->csum_check && !pp->csum_check(cp->af, skb, pp))
258 * Attempt ip_vs_app call.
259 * It will fix ip_vs_conn and iph ack_seq stuff
261 if (!ip_vs_app_pkt_in(cp, skb))
265 tcph = (void *)skb_network_header(skb) + tcphoff;
266 tcph->dest = cp->dport;
269 * Adjust TCP checksums
271 if (skb->ip_summed == CHECKSUM_PARTIAL) {
272 tcp_partial_csum_update(cp->af, tcph, &cp->daddr, &cp->vaddr,
274 htons(skb->len - tcphoff));
275 } else if (!cp->app) {
276 /* Only port and addr are changed, do fast csum update */
277 tcp_fast_csum_update(cp->af, tcph, &cp->vaddr, &cp->daddr,
278 cp->vport, cp->dport);
279 if (skb->ip_summed == CHECKSUM_COMPLETE)
280 skb->ip_summed = CHECKSUM_NONE;
282 /* full checksum calculation */
284 skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0);
285 #ifdef CONFIG_IP_VS_IPV6
286 if (cp->af == AF_INET6)
287 tcph->check = csum_ipv6_magic(&cp->caddr.in6,
290 cp->protocol, skb->csum);
293 tcph->check = csum_tcpudp_magic(cp->caddr.ip,
298 skb->ip_summed = CHECKSUM_UNNECESSARY;
305 tcp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp)
307 unsigned int tcphoff;
309 #ifdef CONFIG_IP_VS_IPV6
311 tcphoff = sizeof(struct ipv6hdr);
314 tcphoff = ip_hdrlen(skb);
316 switch (skb->ip_summed) {
318 skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0);
319 case CHECKSUM_COMPLETE:
320 #ifdef CONFIG_IP_VS_IPV6
321 if (af == AF_INET6) {
322 if (csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
323 &ipv6_hdr(skb)->daddr,
325 ipv6_hdr(skb)->nexthdr,
327 IP_VS_DBG_RL_PKT(0, pp, skb, 0,
328 "Failed checksum for");
333 if (csum_tcpudp_magic(ip_hdr(skb)->saddr,
336 ip_hdr(skb)->protocol,
338 IP_VS_DBG_RL_PKT(0, pp, skb, 0,
339 "Failed checksum for");
344 /* No need to checksum. */
352 #define TCP_DIR_INPUT 0
353 #define TCP_DIR_OUTPUT 4
354 #define TCP_DIR_INPUT_ONLY 8
356 static const int tcp_state_off[IP_VS_DIR_LAST] = {
357 [IP_VS_DIR_INPUT] = TCP_DIR_INPUT,
358 [IP_VS_DIR_OUTPUT] = TCP_DIR_OUTPUT,
359 [IP_VS_DIR_INPUT_ONLY] = TCP_DIR_INPUT_ONLY,
363 * Timeout table[state]
365 static int tcp_timeouts[IP_VS_TCP_S_LAST+1] = {
366 [IP_VS_TCP_S_NONE] = 2*HZ,
367 [IP_VS_TCP_S_ESTABLISHED] = 15*60*HZ,
368 [IP_VS_TCP_S_SYN_SENT] = 2*60*HZ,
369 [IP_VS_TCP_S_SYN_RECV] = 1*60*HZ,
370 [IP_VS_TCP_S_FIN_WAIT] = 2*60*HZ,
371 [IP_VS_TCP_S_TIME_WAIT] = 2*60*HZ,
372 [IP_VS_TCP_S_CLOSE] = 10*HZ,
373 [IP_VS_TCP_S_CLOSE_WAIT] = 60*HZ,
374 [IP_VS_TCP_S_LAST_ACK] = 30*HZ,
375 [IP_VS_TCP_S_LISTEN] = 2*60*HZ,
376 [IP_VS_TCP_S_SYNACK] = 120*HZ,
377 [IP_VS_TCP_S_LAST] = 2*HZ,
380 static const char *const tcp_state_name_table[IP_VS_TCP_S_LAST+1] = {
381 [IP_VS_TCP_S_NONE] = "NONE",
382 [IP_VS_TCP_S_ESTABLISHED] = "ESTABLISHED",
383 [IP_VS_TCP_S_SYN_SENT] = "SYN_SENT",
384 [IP_VS_TCP_S_SYN_RECV] = "SYN_RECV",
385 [IP_VS_TCP_S_FIN_WAIT] = "FIN_WAIT",
386 [IP_VS_TCP_S_TIME_WAIT] = "TIME_WAIT",
387 [IP_VS_TCP_S_CLOSE] = "CLOSE",
388 [IP_VS_TCP_S_CLOSE_WAIT] = "CLOSE_WAIT",
389 [IP_VS_TCP_S_LAST_ACK] = "LAST_ACK",
390 [IP_VS_TCP_S_LISTEN] = "LISTEN",
391 [IP_VS_TCP_S_SYNACK] = "SYNACK",
392 [IP_VS_TCP_S_LAST] = "BUG!",
395 #define sNO IP_VS_TCP_S_NONE
396 #define sES IP_VS_TCP_S_ESTABLISHED
397 #define sSS IP_VS_TCP_S_SYN_SENT
398 #define sSR IP_VS_TCP_S_SYN_RECV
399 #define sFW IP_VS_TCP_S_FIN_WAIT
400 #define sTW IP_VS_TCP_S_TIME_WAIT
401 #define sCL IP_VS_TCP_S_CLOSE
402 #define sCW IP_VS_TCP_S_CLOSE_WAIT
403 #define sLA IP_VS_TCP_S_LAST_ACK
404 #define sLI IP_VS_TCP_S_LISTEN
405 #define sSA IP_VS_TCP_S_SYNACK
407 struct tcp_states_t {
408 int next_state[IP_VS_TCP_S_LAST];
411 static const char * tcp_state_name(int state)
413 if (state >= IP_VS_TCP_S_LAST)
415 return tcp_state_name_table[state] ? tcp_state_name_table[state] : "?";
418 static struct tcp_states_t tcp_states [] = {
420 /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */
421 /*syn*/ {{sSR, sES, sES, sSR, sSR, sSR, sSR, sSR, sSR, sSR, sSR }},
422 /*fin*/ {{sCL, sCW, sSS, sTW, sTW, sTW, sCL, sCW, sLA, sLI, sTW }},
423 /*ack*/ {{sCL, sES, sSS, sES, sFW, sTW, sCL, sCW, sCL, sLI, sES }},
424 /*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sSR }},
427 /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */
428 /*syn*/ {{sSS, sES, sSS, sSR, sSS, sSS, sSS, sSS, sSS, sLI, sSR }},
429 /*fin*/ {{sTW, sFW, sSS, sTW, sFW, sTW, sCL, sTW, sLA, sLI, sTW }},
430 /*ack*/ {{sES, sES, sSS, sES, sFW, sTW, sCL, sCW, sLA, sES, sES }},
431 /*rst*/ {{sCL, sCL, sSS, sCL, sCL, sTW, sCL, sCL, sCL, sCL, sCL }},
434 /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */
435 /*syn*/ {{sSR, sES, sES, sSR, sSR, sSR, sSR, sSR, sSR, sSR, sSR }},
436 /*fin*/ {{sCL, sFW, sSS, sTW, sFW, sTW, sCL, sCW, sLA, sLI, sTW }},
437 /*ack*/ {{sCL, sES, sSS, sES, sFW, sTW, sCL, sCW, sCL, sLI, sES }},
438 /*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sCL }},
441 static struct tcp_states_t tcp_states_dos [] = {
443 /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */
444 /*syn*/ {{sSR, sES, sES, sSR, sSR, sSR, sSR, sSR, sSR, sSR, sSA }},
445 /*fin*/ {{sCL, sCW, sSS, sTW, sTW, sTW, sCL, sCW, sLA, sLI, sSA }},
446 /*ack*/ {{sCL, sES, sSS, sSR, sFW, sTW, sCL, sCW, sCL, sLI, sSA }},
447 /*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sCL }},
450 /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */
451 /*syn*/ {{sSS, sES, sSS, sSA, sSS, sSS, sSS, sSS, sSS, sLI, sSA }},
452 /*fin*/ {{sTW, sFW, sSS, sTW, sFW, sTW, sCL, sTW, sLA, sLI, sTW }},
453 /*ack*/ {{sES, sES, sSS, sES, sFW, sTW, sCL, sCW, sLA, sES, sES }},
454 /*rst*/ {{sCL, sCL, sSS, sCL, sCL, sTW, sCL, sCL, sCL, sCL, sCL }},
457 /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */
458 /*syn*/ {{sSA, sES, sES, sSR, sSA, sSA, sSA, sSA, sSA, sSA, sSA }},
459 /*fin*/ {{sCL, sFW, sSS, sTW, sFW, sTW, sCL, sCW, sLA, sLI, sTW }},
460 /*ack*/ {{sCL, sES, sSS, sES, sFW, sTW, sCL, sCW, sCL, sLI, sES }},
461 /*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sCL }},
464 static struct tcp_states_t *tcp_state_table = tcp_states;
467 static void tcp_timeout_change(struct ip_vs_protocol *pp, int flags)
469 int on = (flags & 1); /* secure_tcp */
472 ** FIXME: change secure_tcp to independent sysctl var
473 ** or make it per-service or per-app because it is valid
474 ** for most if not for all of the applications. Something
475 ** like "capabilities" (flags) for each object.
477 tcp_state_table = (on? tcp_states_dos : tcp_states);
481 tcp_set_state_timeout(struct ip_vs_protocol *pp, char *sname, int to)
483 return ip_vs_set_state_timeout(pp->timeout_table, IP_VS_TCP_S_LAST,
484 tcp_state_name_table, sname, to);
487 static inline int tcp_state_idx(struct tcphdr *th)
501 set_tcp_state(struct ip_vs_protocol *pp, struct ip_vs_conn *cp,
502 int direction, struct tcphdr *th)
505 int new_state = IP_VS_TCP_S_CLOSE;
506 int state_off = tcp_state_off[direction];
509 * Update state offset to INPUT_ONLY if necessary
510 * or delete NO_OUTPUT flag if output packet detected
512 if (cp->flags & IP_VS_CONN_F_NOOUTPUT) {
513 if (state_off == TCP_DIR_OUTPUT)
514 cp->flags &= ~IP_VS_CONN_F_NOOUTPUT;
516 state_off = TCP_DIR_INPUT_ONLY;
519 if ((state_idx = tcp_state_idx(th)) < 0) {
520 IP_VS_DBG(8, "tcp_state_idx=%d!!!\n", state_idx);
524 new_state = tcp_state_table[state_off+state_idx].next_state[cp->state];
527 if (new_state != cp->state) {
528 struct ip_vs_dest *dest = cp->dest;
530 IP_VS_DBG_BUF(8, "%s %s [%c%c%c%c] %s:%d->"
531 "%s:%d state: %s->%s conn->refcnt:%d\n",
533 ((state_off == TCP_DIR_OUTPUT) ?
534 "output " : "input "),
539 IP_VS_DBG_ADDR(cp->af, &cp->daddr),
541 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
543 tcp_state_name(cp->state),
544 tcp_state_name(new_state),
545 atomic_read(&cp->refcnt));
548 if (!(cp->flags & IP_VS_CONN_F_INACTIVE) &&
549 (new_state != IP_VS_TCP_S_ESTABLISHED)) {
550 atomic_dec(&dest->activeconns);
551 atomic_inc(&dest->inactconns);
552 cp->flags |= IP_VS_CONN_F_INACTIVE;
553 } else if ((cp->flags & IP_VS_CONN_F_INACTIVE) &&
554 (new_state == IP_VS_TCP_S_ESTABLISHED)) {
555 atomic_inc(&dest->activeconns);
556 atomic_dec(&dest->inactconns);
557 cp->flags &= ~IP_VS_CONN_F_INACTIVE;
562 cp->timeout = pp->timeout_table[cp->state = new_state];
567 * Handle state transitions
570 tcp_state_transition(struct ip_vs_conn *cp, int direction,
571 const struct sk_buff *skb,
572 struct ip_vs_protocol *pp)
574 struct tcphdr _tcph, *th;
576 #ifdef CONFIG_IP_VS_IPV6
577 int ihl = cp->af == AF_INET ? ip_hdrlen(skb) : sizeof(struct ipv6hdr);
579 int ihl = ip_hdrlen(skb);
582 th = skb_header_pointer(skb, ihl, sizeof(_tcph), &_tcph);
586 spin_lock(&cp->lock);
587 set_tcp_state(pp, cp, direction, th);
588 spin_unlock(&cp->lock);
595 * Hash table for TCP application incarnations
597 #define TCP_APP_TAB_BITS 4
598 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
599 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
601 static struct list_head tcp_apps[TCP_APP_TAB_SIZE];
602 static DEFINE_SPINLOCK(tcp_app_lock);
604 static inline __u16 tcp_app_hashkey(__be16 port)
606 return (((__force u16)port >> TCP_APP_TAB_BITS) ^ (__force u16)port)
611 static int tcp_register_app(struct ip_vs_app *inc)
615 __be16 port = inc->port;
618 hash = tcp_app_hashkey(port);
620 spin_lock_bh(&tcp_app_lock);
621 list_for_each_entry(i, &tcp_apps[hash], p_list) {
622 if (i->port == port) {
627 list_add(&inc->p_list, &tcp_apps[hash]);
628 atomic_inc(&ip_vs_protocol_tcp.appcnt);
631 spin_unlock_bh(&tcp_app_lock);
637 tcp_unregister_app(struct ip_vs_app *inc)
639 spin_lock_bh(&tcp_app_lock);
640 atomic_dec(&ip_vs_protocol_tcp.appcnt);
641 list_del(&inc->p_list);
642 spin_unlock_bh(&tcp_app_lock);
647 tcp_app_conn_bind(struct ip_vs_conn *cp)
650 struct ip_vs_app *inc;
653 /* Default binding: bind app only for NAT */
654 if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)
657 /* Lookup application incarnations and bind the right one */
658 hash = tcp_app_hashkey(cp->vport);
660 spin_lock(&tcp_app_lock);
661 list_for_each_entry(inc, &tcp_apps[hash], p_list) {
662 if (inc->port == cp->vport) {
663 if (unlikely(!ip_vs_app_inc_get(inc)))
665 spin_unlock(&tcp_app_lock);
667 IP_VS_DBG_BUF(9, "%s(): Binding conn %s:%u->"
668 "%s:%u to app %s on port %u\n",
670 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
672 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
674 inc->name, ntohs(inc->port));
678 result = inc->init_conn(inc, cp);
682 spin_unlock(&tcp_app_lock);
690 * Set LISTEN timeout. (ip_vs_conn_put will setup timer)
692 void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp)
694 spin_lock(&cp->lock);
695 cp->state = IP_VS_TCP_S_LISTEN;
696 cp->timeout = ip_vs_protocol_tcp.timeout_table[IP_VS_TCP_S_LISTEN];
697 spin_unlock(&cp->lock);
701 static void ip_vs_tcp_init(struct ip_vs_protocol *pp)
703 IP_VS_INIT_HASH_TABLE(tcp_apps);
704 pp->timeout_table = tcp_timeouts;
708 static void ip_vs_tcp_exit(struct ip_vs_protocol *pp)
713 struct ip_vs_protocol ip_vs_protocol_tcp = {
715 .protocol = IPPROTO_TCP,
716 .num_states = IP_VS_TCP_S_LAST,
718 .appcnt = ATOMIC_INIT(0),
719 .init = ip_vs_tcp_init,
720 .exit = ip_vs_tcp_exit,
721 .register_app = tcp_register_app,
722 .unregister_app = tcp_unregister_app,
723 .conn_schedule = tcp_conn_schedule,
724 .conn_in_get = tcp_conn_in_get,
725 .conn_out_get = tcp_conn_out_get,
726 .snat_handler = tcp_snat_handler,
727 .dnat_handler = tcp_dnat_handler,
728 .csum_check = tcp_csum_check,
729 .state_name = tcp_state_name,
730 .state_transition = tcp_state_transition,
731 .app_conn_bind = tcp_app_conn_bind,
732 .debug_packet = ip_vs_tcpudp_debug_packet,
733 .timeout_change = tcp_timeout_change,
734 .set_state_timeout = tcp_set_state_timeout,