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.
12 * Changes: Hans Schillstrom <hans.schillstrom@ericsson.com>
14 * Network name space (netns) aware.
15 * Global data moved to netns i.e struct netns_ipvs
16 * tcp_timeouts table has copy per netns in a hash table per
17 * protocol ip_vs_proto_data and is handled by netns
20 #define KMSG_COMPONENT "IPVS"
21 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
23 #include <linux/kernel.h>
25 #include <linux/tcp.h> /* for tcphdr */
27 #include <net/tcp.h> /* for csum_tcpudp_magic */
28 #include <net/ip6_checksum.h>
29 #include <linux/netfilter.h>
30 #include <linux/netfilter_ipv4.h>
32 #include <net/ip_vs.h>
35 tcp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd,
36 int *verdict, struct ip_vs_conn **cpp)
39 struct ip_vs_service *svc;
40 struct tcphdr _tcph, *th;
41 struct ip_vs_iphdr iph;
43 ip_vs_fill_iphdr(af, skb_network_header(skb), &iph);
45 th = skb_header_pointer(skb, iph.len, sizeof(_tcph), &_tcph);
51 /* No !th->ack check to allow scheduling on SYN+ACK for Active FTP */
53 (svc = ip_vs_service_get(net, af, skb->mark, iph.protocol,
54 &iph.daddr, th->dest))) {
57 if (ip_vs_todrop(net_ipvs(net))) {
59 * It seems that we are very loaded.
60 * We have to drop this packet :(
62 ip_vs_service_put(svc);
68 * Let the virtual server select a real server for the
69 * incoming connection, and create a connection entry.
71 *cpp = ip_vs_schedule(svc, skb, pd, &ignored);
72 if (!*cpp && ignored <= 0) {
74 *verdict = ip_vs_leave(svc, skb, pd);
76 ip_vs_service_put(svc);
81 ip_vs_service_put(svc);
89 tcp_fast_csum_update(int af, struct tcphdr *tcph,
90 const union nf_inet_addr *oldip,
91 const union nf_inet_addr *newip,
92 __be16 oldport, __be16 newport)
94 #ifdef CONFIG_IP_VS_IPV6
97 csum_fold(ip_vs_check_diff16(oldip->ip6, newip->ip6,
98 ip_vs_check_diff2(oldport, newport,
99 ~csum_unfold(tcph->check))));
103 csum_fold(ip_vs_check_diff4(oldip->ip, newip->ip,
104 ip_vs_check_diff2(oldport, newport,
105 ~csum_unfold(tcph->check))));
110 tcp_partial_csum_update(int af, struct tcphdr *tcph,
111 const union nf_inet_addr *oldip,
112 const union nf_inet_addr *newip,
113 __be16 oldlen, __be16 newlen)
115 #ifdef CONFIG_IP_VS_IPV6
118 ~csum_fold(ip_vs_check_diff16(oldip->ip6, newip->ip6,
119 ip_vs_check_diff2(oldlen, newlen,
120 csum_unfold(tcph->check))));
124 ~csum_fold(ip_vs_check_diff4(oldip->ip, newip->ip,
125 ip_vs_check_diff2(oldlen, newlen,
126 csum_unfold(tcph->check))));
131 tcp_snat_handler(struct sk_buff *skb,
132 struct ip_vs_protocol *pp, struct ip_vs_conn *cp)
135 unsigned int tcphoff;
137 int payload_csum = 0;
139 #ifdef CONFIG_IP_VS_IPV6
140 if (cp->af == AF_INET6)
141 tcphoff = sizeof(struct ipv6hdr);
144 tcphoff = ip_hdrlen(skb);
145 oldlen = skb->len - tcphoff;
147 /* csum_check requires unshared skb */
148 if (!skb_make_writable(skb, tcphoff+sizeof(*tcph)))
151 if (unlikely(cp->app != NULL)) {
154 /* Some checks before mangling */
155 if (pp->csum_check && !pp->csum_check(cp->af, skb, pp))
158 /* Call application helper if needed */
159 if (!(ret = ip_vs_app_pkt_out(cp, skb)))
161 /* ret=2: csum update is needed after payload mangling */
163 oldlen = skb->len - tcphoff;
168 tcph = (void *)skb_network_header(skb) + tcphoff;
169 tcph->source = cp->vport;
171 /* Adjust TCP checksums */
172 if (skb->ip_summed == CHECKSUM_PARTIAL) {
173 tcp_partial_csum_update(cp->af, tcph, &cp->daddr, &cp->vaddr,
175 htons(skb->len - tcphoff));
176 } else if (!payload_csum) {
177 /* Only port and addr are changed, do fast csum update */
178 tcp_fast_csum_update(cp->af, tcph, &cp->daddr, &cp->vaddr,
179 cp->dport, cp->vport);
180 if (skb->ip_summed == CHECKSUM_COMPLETE)
181 skb->ip_summed = (cp->app && pp->csum_check) ?
182 CHECKSUM_UNNECESSARY : CHECKSUM_NONE;
184 /* full checksum calculation */
186 skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0);
187 #ifdef CONFIG_IP_VS_IPV6
188 if (cp->af == AF_INET6)
189 tcph->check = csum_ipv6_magic(&cp->vaddr.in6,
192 cp->protocol, skb->csum);
195 tcph->check = csum_tcpudp_magic(cp->vaddr.ip,
200 skb->ip_summed = CHECKSUM_UNNECESSARY;
202 IP_VS_DBG(11, "O-pkt: %s O-csum=%d (+%zd)\n",
203 pp->name, tcph->check,
204 (char*)&(tcph->check) - (char*)tcph);
211 tcp_dnat_handler(struct sk_buff *skb,
212 struct ip_vs_protocol *pp, struct ip_vs_conn *cp)
215 unsigned int tcphoff;
217 int payload_csum = 0;
219 #ifdef CONFIG_IP_VS_IPV6
220 if (cp->af == AF_INET6)
221 tcphoff = sizeof(struct ipv6hdr);
224 tcphoff = ip_hdrlen(skb);
225 oldlen = skb->len - tcphoff;
227 /* csum_check requires unshared skb */
228 if (!skb_make_writable(skb, tcphoff+sizeof(*tcph)))
231 if (unlikely(cp->app != NULL)) {
234 /* Some checks before mangling */
235 if (pp->csum_check && !pp->csum_check(cp->af, skb, pp))
239 * Attempt ip_vs_app call.
240 * It will fix ip_vs_conn and iph ack_seq stuff
242 if (!(ret = ip_vs_app_pkt_in(cp, skb)))
244 /* ret=2: csum update is needed after payload mangling */
246 oldlen = skb->len - tcphoff;
251 tcph = (void *)skb_network_header(skb) + tcphoff;
252 tcph->dest = cp->dport;
255 * Adjust TCP checksums
257 if (skb->ip_summed == CHECKSUM_PARTIAL) {
258 tcp_partial_csum_update(cp->af, tcph, &cp->vaddr, &cp->daddr,
260 htons(skb->len - tcphoff));
261 } else if (!payload_csum) {
262 /* Only port and addr are changed, do fast csum update */
263 tcp_fast_csum_update(cp->af, tcph, &cp->vaddr, &cp->daddr,
264 cp->vport, cp->dport);
265 if (skb->ip_summed == CHECKSUM_COMPLETE)
266 skb->ip_summed = (cp->app && pp->csum_check) ?
267 CHECKSUM_UNNECESSARY : CHECKSUM_NONE;
269 /* full checksum calculation */
271 skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0);
272 #ifdef CONFIG_IP_VS_IPV6
273 if (cp->af == AF_INET6)
274 tcph->check = csum_ipv6_magic(&cp->caddr.in6,
277 cp->protocol, skb->csum);
280 tcph->check = csum_tcpudp_magic(cp->caddr.ip,
285 skb->ip_summed = CHECKSUM_UNNECESSARY;
292 tcp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp)
294 unsigned int tcphoff;
296 #ifdef CONFIG_IP_VS_IPV6
298 tcphoff = sizeof(struct ipv6hdr);
301 tcphoff = ip_hdrlen(skb);
303 switch (skb->ip_summed) {
305 skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0);
306 case CHECKSUM_COMPLETE:
307 #ifdef CONFIG_IP_VS_IPV6
308 if (af == AF_INET6) {
309 if (csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
310 &ipv6_hdr(skb)->daddr,
312 ipv6_hdr(skb)->nexthdr,
314 IP_VS_DBG_RL_PKT(0, af, pp, skb, 0,
315 "Failed checksum for");
320 if (csum_tcpudp_magic(ip_hdr(skb)->saddr,
323 ip_hdr(skb)->protocol,
325 IP_VS_DBG_RL_PKT(0, af, pp, skb, 0,
326 "Failed checksum for");
331 /* No need to checksum. */
339 #define TCP_DIR_INPUT 0
340 #define TCP_DIR_OUTPUT 4
341 #define TCP_DIR_INPUT_ONLY 8
343 static const int tcp_state_off[IP_VS_DIR_LAST] = {
344 [IP_VS_DIR_INPUT] = TCP_DIR_INPUT,
345 [IP_VS_DIR_OUTPUT] = TCP_DIR_OUTPUT,
346 [IP_VS_DIR_INPUT_ONLY] = TCP_DIR_INPUT_ONLY,
350 * Timeout table[state]
352 static const int tcp_timeouts[IP_VS_TCP_S_LAST+1] = {
353 [IP_VS_TCP_S_NONE] = 2*HZ,
354 [IP_VS_TCP_S_ESTABLISHED] = 15*60*HZ,
355 [IP_VS_TCP_S_SYN_SENT] = 2*60*HZ,
356 [IP_VS_TCP_S_SYN_RECV] = 1*60*HZ,
357 [IP_VS_TCP_S_FIN_WAIT] = 2*60*HZ,
358 [IP_VS_TCP_S_TIME_WAIT] = 2*60*HZ,
359 [IP_VS_TCP_S_CLOSE] = 10*HZ,
360 [IP_VS_TCP_S_CLOSE_WAIT] = 60*HZ,
361 [IP_VS_TCP_S_LAST_ACK] = 30*HZ,
362 [IP_VS_TCP_S_LISTEN] = 2*60*HZ,
363 [IP_VS_TCP_S_SYNACK] = 120*HZ,
364 [IP_VS_TCP_S_LAST] = 2*HZ,
367 static const char *const tcp_state_name_table[IP_VS_TCP_S_LAST+1] = {
368 [IP_VS_TCP_S_NONE] = "NONE",
369 [IP_VS_TCP_S_ESTABLISHED] = "ESTABLISHED",
370 [IP_VS_TCP_S_SYN_SENT] = "SYN_SENT",
371 [IP_VS_TCP_S_SYN_RECV] = "SYN_RECV",
372 [IP_VS_TCP_S_FIN_WAIT] = "FIN_WAIT",
373 [IP_VS_TCP_S_TIME_WAIT] = "TIME_WAIT",
374 [IP_VS_TCP_S_CLOSE] = "CLOSE",
375 [IP_VS_TCP_S_CLOSE_WAIT] = "CLOSE_WAIT",
376 [IP_VS_TCP_S_LAST_ACK] = "LAST_ACK",
377 [IP_VS_TCP_S_LISTEN] = "LISTEN",
378 [IP_VS_TCP_S_SYNACK] = "SYNACK",
379 [IP_VS_TCP_S_LAST] = "BUG!",
382 #define sNO IP_VS_TCP_S_NONE
383 #define sES IP_VS_TCP_S_ESTABLISHED
384 #define sSS IP_VS_TCP_S_SYN_SENT
385 #define sSR IP_VS_TCP_S_SYN_RECV
386 #define sFW IP_VS_TCP_S_FIN_WAIT
387 #define sTW IP_VS_TCP_S_TIME_WAIT
388 #define sCL IP_VS_TCP_S_CLOSE
389 #define sCW IP_VS_TCP_S_CLOSE_WAIT
390 #define sLA IP_VS_TCP_S_LAST_ACK
391 #define sLI IP_VS_TCP_S_LISTEN
392 #define sSA IP_VS_TCP_S_SYNACK
394 struct tcp_states_t {
395 int next_state[IP_VS_TCP_S_LAST];
398 static const char * tcp_state_name(int state)
400 if (state >= IP_VS_TCP_S_LAST)
402 return tcp_state_name_table[state] ? tcp_state_name_table[state] : "?";
405 static struct tcp_states_t tcp_states [] = {
407 /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */
408 /*syn*/ {{sSR, sES, sES, sSR, sSR, sSR, sSR, sSR, sSR, sSR, sSR }},
409 /*fin*/ {{sCL, sCW, sSS, sTW, sTW, sTW, sCL, sCW, sLA, sLI, sTW }},
410 /*ack*/ {{sCL, sES, sSS, sES, sFW, sTW, sCL, sCW, sCL, sLI, sES }},
411 /*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sSR }},
414 /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */
415 /*syn*/ {{sSS, sES, sSS, sSR, sSS, sSS, sSS, sSS, sSS, sLI, sSR }},
416 /*fin*/ {{sTW, sFW, sSS, sTW, sFW, sTW, sCL, sTW, sLA, sLI, sTW }},
417 /*ack*/ {{sES, sES, sSS, sES, sFW, sTW, sCL, sCW, sLA, sES, sES }},
418 /*rst*/ {{sCL, sCL, sSS, sCL, sCL, sTW, sCL, sCL, sCL, sCL, sCL }},
421 /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */
422 /*syn*/ {{sSR, sES, sES, sSR, sSR, sSR, sSR, sSR, sSR, sSR, sSR }},
423 /*fin*/ {{sCL, sFW, sSS, sTW, sFW, sTW, sCL, sCW, sLA, sLI, sTW }},
424 /*ack*/ {{sCL, sES, sSS, sES, sFW, sTW, sCL, sCW, sCL, sLI, sES }},
425 /*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sCL }},
428 static struct tcp_states_t tcp_states_dos [] = {
430 /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */
431 /*syn*/ {{sSR, sES, sES, sSR, sSR, sSR, sSR, sSR, sSR, sSR, sSA }},
432 /*fin*/ {{sCL, sCW, sSS, sTW, sTW, sTW, sCL, sCW, sLA, sLI, sSA }},
433 /*ack*/ {{sCL, sES, sSS, sSR, sFW, sTW, sCL, sCW, sCL, sLI, sSA }},
434 /*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sCL }},
437 /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */
438 /*syn*/ {{sSS, sES, sSS, sSA, sSS, sSS, sSS, sSS, sSS, sLI, sSA }},
439 /*fin*/ {{sTW, sFW, sSS, sTW, sFW, sTW, sCL, sTW, sLA, sLI, sTW }},
440 /*ack*/ {{sES, sES, sSS, sES, sFW, sTW, sCL, sCW, sLA, sES, sES }},
441 /*rst*/ {{sCL, sCL, sSS, sCL, sCL, sTW, sCL, sCL, sCL, sCL, sCL }},
444 /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */
445 /*syn*/ {{sSA, sES, sES, sSR, sSA, sSA, sSA, sSA, sSA, sSA, sSA }},
446 /*fin*/ {{sCL, sFW, sSS, sTW, sFW, sTW, sCL, sCW, sLA, sLI, sTW }},
447 /*ack*/ {{sCL, sES, sSS, sES, sFW, sTW, sCL, sCW, sCL, sLI, sES }},
448 /*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sCL }},
451 static void tcp_timeout_change(struct ip_vs_proto_data *pd, int flags)
453 int on = (flags & 1); /* secure_tcp */
456 ** FIXME: change secure_tcp to independent sysctl var
457 ** or make it per-service or per-app because it is valid
458 ** for most if not for all of the applications. Something
459 ** like "capabilities" (flags) for each object.
461 pd->tcp_state_table = (on ? tcp_states_dos : tcp_states);
464 static inline int tcp_state_idx(struct tcphdr *th)
478 set_tcp_state(struct ip_vs_proto_data *pd, struct ip_vs_conn *cp,
479 int direction, struct tcphdr *th)
482 int new_state = IP_VS_TCP_S_CLOSE;
483 int state_off = tcp_state_off[direction];
486 * Update state offset to INPUT_ONLY if necessary
487 * or delete NO_OUTPUT flag if output packet detected
489 if (cp->flags & IP_VS_CONN_F_NOOUTPUT) {
490 if (state_off == TCP_DIR_OUTPUT)
491 cp->flags &= ~IP_VS_CONN_F_NOOUTPUT;
493 state_off = TCP_DIR_INPUT_ONLY;
496 if ((state_idx = tcp_state_idx(th)) < 0) {
497 IP_VS_DBG(8, "tcp_state_idx=%d!!!\n", state_idx);
502 pd->tcp_state_table[state_off+state_idx].next_state[cp->state];
505 if (new_state != cp->state) {
506 struct ip_vs_dest *dest = cp->dest;
508 IP_VS_DBG_BUF(8, "%s %s [%c%c%c%c] %s:%d->"
509 "%s:%d state: %s->%s conn->refcnt:%d\n",
511 ((state_off == TCP_DIR_OUTPUT) ?
512 "output " : "input "),
517 IP_VS_DBG_ADDR(cp->af, &cp->daddr),
519 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
521 tcp_state_name(cp->state),
522 tcp_state_name(new_state),
523 atomic_read(&cp->refcnt));
526 if (!(cp->flags & IP_VS_CONN_F_INACTIVE) &&
527 (new_state != IP_VS_TCP_S_ESTABLISHED)) {
528 atomic_dec(&dest->activeconns);
529 atomic_inc(&dest->inactconns);
530 cp->flags |= IP_VS_CONN_F_INACTIVE;
531 } else if ((cp->flags & IP_VS_CONN_F_INACTIVE) &&
532 (new_state == IP_VS_TCP_S_ESTABLISHED)) {
533 atomic_inc(&dest->activeconns);
534 atomic_dec(&dest->inactconns);
535 cp->flags &= ~IP_VS_CONN_F_INACTIVE;
541 cp->timeout = pd->timeout_table[cp->state = new_state];
542 else /* What to do ? */
543 cp->timeout = tcp_timeouts[cp->state = new_state];
547 * Handle state transitions
550 tcp_state_transition(struct ip_vs_conn *cp, int direction,
551 const struct sk_buff *skb,
552 struct ip_vs_proto_data *pd)
554 struct tcphdr _tcph, *th;
556 #ifdef CONFIG_IP_VS_IPV6
557 int ihl = cp->af == AF_INET ? ip_hdrlen(skb) : sizeof(struct ipv6hdr);
559 int ihl = ip_hdrlen(skb);
562 th = skb_header_pointer(skb, ihl, sizeof(_tcph), &_tcph);
566 spin_lock(&cp->lock);
567 set_tcp_state(pd, cp, direction, th);
568 spin_unlock(&cp->lock);
571 static inline __u16 tcp_app_hashkey(__be16 port)
573 return (((__force u16)port >> TCP_APP_TAB_BITS) ^ (__force u16)port)
578 static int tcp_register_app(struct net *net, struct ip_vs_app *inc)
582 __be16 port = inc->port;
584 struct netns_ipvs *ipvs = net_ipvs(net);
585 struct ip_vs_proto_data *pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
587 hash = tcp_app_hashkey(port);
589 spin_lock_bh(&ipvs->tcp_app_lock);
590 list_for_each_entry(i, &ipvs->tcp_apps[hash], p_list) {
591 if (i->port == port) {
596 list_add(&inc->p_list, &ipvs->tcp_apps[hash]);
597 atomic_inc(&pd->appcnt);
600 spin_unlock_bh(&ipvs->tcp_app_lock);
606 tcp_unregister_app(struct net *net, struct ip_vs_app *inc)
608 struct netns_ipvs *ipvs = net_ipvs(net);
609 struct ip_vs_proto_data *pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
611 spin_lock_bh(&ipvs->tcp_app_lock);
612 atomic_dec(&pd->appcnt);
613 list_del(&inc->p_list);
614 spin_unlock_bh(&ipvs->tcp_app_lock);
619 tcp_app_conn_bind(struct ip_vs_conn *cp)
621 struct netns_ipvs *ipvs = net_ipvs(ip_vs_conn_net(cp));
623 struct ip_vs_app *inc;
626 /* Default binding: bind app only for NAT */
627 if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)
630 /* Lookup application incarnations and bind the right one */
631 hash = tcp_app_hashkey(cp->vport);
633 spin_lock(&ipvs->tcp_app_lock);
634 list_for_each_entry(inc, &ipvs->tcp_apps[hash], p_list) {
635 if (inc->port == cp->vport) {
636 if (unlikely(!ip_vs_app_inc_get(inc)))
638 spin_unlock(&ipvs->tcp_app_lock);
640 IP_VS_DBG_BUF(9, "%s(): Binding conn %s:%u->"
641 "%s:%u to app %s on port %u\n",
643 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
645 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
647 inc->name, ntohs(inc->port));
651 result = inc->init_conn(inc, cp);
655 spin_unlock(&ipvs->tcp_app_lock);
663 * Set LISTEN timeout. (ip_vs_conn_put will setup timer)
665 void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp)
667 struct ip_vs_proto_data *pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
669 spin_lock(&cp->lock);
670 cp->state = IP_VS_TCP_S_LISTEN;
671 cp->timeout = (pd ? pd->timeout_table[IP_VS_TCP_S_LISTEN]
672 : tcp_timeouts[IP_VS_TCP_S_LISTEN]);
673 spin_unlock(&cp->lock);
676 /* ---------------------------------------------
677 * timeouts is netns related now.
678 * ---------------------------------------------
680 static int __ip_vs_tcp_init(struct net *net, struct ip_vs_proto_data *pd)
682 struct netns_ipvs *ipvs = net_ipvs(net);
684 ip_vs_init_hash_table(ipvs->tcp_apps, TCP_APP_TAB_SIZE);
685 spin_lock_init(&ipvs->tcp_app_lock);
686 pd->timeout_table = ip_vs_create_timeout_table((int *)tcp_timeouts,
687 sizeof(tcp_timeouts));
688 if (!pd->timeout_table)
690 pd->tcp_state_table = tcp_states;
694 static void __ip_vs_tcp_exit(struct net *net, struct ip_vs_proto_data *pd)
696 kfree(pd->timeout_table);
700 struct ip_vs_protocol ip_vs_protocol_tcp = {
702 .protocol = IPPROTO_TCP,
703 .num_states = IP_VS_TCP_S_LAST,
707 .init_netns = __ip_vs_tcp_init,
708 .exit_netns = __ip_vs_tcp_exit,
709 .register_app = tcp_register_app,
710 .unregister_app = tcp_unregister_app,
711 .conn_schedule = tcp_conn_schedule,
712 .conn_in_get = ip_vs_conn_in_get_proto,
713 .conn_out_get = ip_vs_conn_out_get_proto,
714 .snat_handler = tcp_snat_handler,
715 .dnat_handler = tcp_dnat_handler,
716 .csum_check = tcp_csum_check,
717 .state_name = tcp_state_name,
718 .state_transition = tcp_state_transition,
719 .app_conn_bind = tcp_app_conn_bind,
720 .debug_packet = ip_vs_tcpudp_debug_packet,
721 .timeout_change = tcp_timeout_change,