Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * ip_vs_proto_tcp.c: TCP load balancing support for IPVS |
| 3 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> |
| 5 | * Julian Anastasov <ja@ssi.bg> |
| 6 | * |
| 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. |
| 11 | * |
| 12 | * Changes: |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/ip.h> |
| 18 | #include <linux/tcp.h> /* for tcphdr */ |
| 19 | #include <net/ip.h> |
| 20 | #include <net/tcp.h> /* for csum_tcpudp_magic */ |
Stephen Rothwell | 63f2c04 | 2008-09-12 23:23:50 -0700 | [diff] [blame] | 21 | #include <net/ip6_checksum.h> |
Herbert Xu | af1e1cf | 2007-10-14 00:39:33 -0700 | [diff] [blame] | 22 | #include <linux/netfilter.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/netfilter_ipv4.h> |
| 24 | |
| 25 | #include <net/ip_vs.h> |
| 26 | |
| 27 | |
| 28 | static struct ip_vs_conn * |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 29 | tcp_conn_in_get(int af, const struct sk_buff *skb, struct ip_vs_protocol *pp, |
| 30 | const struct ip_vs_iphdr *iph, unsigned int proto_off, |
| 31 | int inverse) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | { |
Al Viro | 014d730 | 2006-09-28 14:29:52 -0700 | [diff] [blame] | 33 | __be16 _ports[2], *pptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
| 35 | pptr = skb_header_pointer(skb, proto_off, sizeof(_ports), _ports); |
| 36 | if (pptr == NULL) |
| 37 | return NULL; |
| 38 | |
| 39 | if (likely(!inverse)) { |
Julius Volz | 28364a5 | 2008-09-02 15:55:43 +0200 | [diff] [blame] | 40 | return ip_vs_conn_in_get(af, iph->protocol, |
| 41 | &iph->saddr, pptr[0], |
| 42 | &iph->daddr, pptr[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | } else { |
Julius Volz | 28364a5 | 2008-09-02 15:55:43 +0200 | [diff] [blame] | 44 | return ip_vs_conn_in_get(af, iph->protocol, |
| 45 | &iph->daddr, pptr[1], |
| 46 | &iph->saddr, pptr[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | } |
| 48 | } |
| 49 | |
| 50 | static struct ip_vs_conn * |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 51 | tcp_conn_out_get(int af, const struct sk_buff *skb, struct ip_vs_protocol *pp, |
| 52 | const struct ip_vs_iphdr *iph, unsigned int proto_off, |
| 53 | int inverse) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | { |
Al Viro | 014d730 | 2006-09-28 14:29:52 -0700 | [diff] [blame] | 55 | __be16 _ports[2], *pptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
| 57 | pptr = skb_header_pointer(skb, proto_off, sizeof(_ports), _ports); |
| 58 | if (pptr == NULL) |
| 59 | return NULL; |
| 60 | |
| 61 | if (likely(!inverse)) { |
Julius Volz | 28364a5 | 2008-09-02 15:55:43 +0200 | [diff] [blame] | 62 | return ip_vs_conn_out_get(af, iph->protocol, |
| 63 | &iph->saddr, pptr[0], |
| 64 | &iph->daddr, pptr[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | } else { |
Julius Volz | 28364a5 | 2008-09-02 15:55:43 +0200 | [diff] [blame] | 66 | return ip_vs_conn_out_get(af, iph->protocol, |
| 67 | &iph->daddr, pptr[1], |
| 68 | &iph->saddr, pptr[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | } |
| 70 | } |
| 71 | |
| 72 | |
| 73 | static int |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 74 | tcp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_protocol *pp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | int *verdict, struct ip_vs_conn **cpp) |
| 76 | { |
| 77 | struct ip_vs_service *svc; |
| 78 | struct tcphdr _tcph, *th; |
Julius Volz | 3c2e050 | 2008-09-02 15:55:38 +0200 | [diff] [blame] | 79 | struct ip_vs_iphdr iph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 81 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); |
Julius Volz | 3c2e050 | 2008-09-02 15:55:38 +0200 | [diff] [blame] | 82 | |
| 83 | th = skb_header_pointer(skb, iph.len, sizeof(_tcph), &_tcph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | if (th == NULL) { |
| 85 | *verdict = NF_DROP; |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | if (th->syn && |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 90 | (svc = ip_vs_service_get(af, skb->mark, iph.protocol, &iph.daddr, |
| 91 | th->dest))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | if (ip_vs_todrop()) { |
| 93 | /* |
| 94 | * It seems that we are very loaded. |
| 95 | * We have to drop this packet :( |
| 96 | */ |
| 97 | ip_vs_service_put(svc); |
| 98 | *verdict = NF_DROP; |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | /* |
| 103 | * Let the virtual server select a real server for the |
| 104 | * incoming connection, and create a connection entry. |
| 105 | */ |
| 106 | *cpp = ip_vs_schedule(svc, skb); |
| 107 | if (!*cpp) { |
| 108 | *verdict = ip_vs_leave(svc, skb, pp); |
| 109 | return 0; |
| 110 | } |
| 111 | ip_vs_service_put(svc); |
| 112 | } |
| 113 | return 1; |
| 114 | } |
| 115 | |
| 116 | |
| 117 | static inline void |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 118 | tcp_fast_csum_update(int af, struct tcphdr *tcph, |
| 119 | const union nf_inet_addr *oldip, |
| 120 | const union nf_inet_addr *newip, |
Al Viro | 014d730 | 2006-09-28 14:29:52 -0700 | [diff] [blame] | 121 | __be16 oldport, __be16 newport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | { |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 123 | #ifdef CONFIG_IP_VS_IPV6 |
| 124 | if (af == AF_INET6) |
| 125 | tcph->check = |
| 126 | csum_fold(ip_vs_check_diff16(oldip->ip6, newip->ip6, |
| 127 | ip_vs_check_diff2(oldport, newport, |
| 128 | ~csum_unfold(tcph->check)))); |
| 129 | else |
| 130 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | tcph->check = |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 132 | csum_fold(ip_vs_check_diff4(oldip->ip, newip->ip, |
Al Viro | f9214b2 | 2006-11-16 02:41:18 -0800 | [diff] [blame] | 133 | ip_vs_check_diff2(oldport, newport, |
| 134 | ~csum_unfold(tcph->check)))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | } |
| 136 | |
| 137 | |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 138 | static inline void |
| 139 | tcp_partial_csum_update(int af, struct tcphdr *tcph, |
| 140 | const union nf_inet_addr *oldip, |
| 141 | const union nf_inet_addr *newip, |
| 142 | __be16 oldlen, __be16 newlen) |
| 143 | { |
| 144 | #ifdef CONFIG_IP_VS_IPV6 |
| 145 | if (af == AF_INET6) |
| 146 | tcph->check = |
| 147 | csum_fold(ip_vs_check_diff16(oldip->ip6, newip->ip6, |
| 148 | ip_vs_check_diff2(oldlen, newlen, |
| 149 | ~csum_unfold(tcph->check)))); |
| 150 | else |
| 151 | #endif |
| 152 | tcph->check = |
| 153 | csum_fold(ip_vs_check_diff4(oldip->ip, newip->ip, |
| 154 | ip_vs_check_diff2(oldlen, newlen, |
| 155 | ~csum_unfold(tcph->check)))); |
| 156 | } |
| 157 | |
| 158 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | static int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 160 | tcp_snat_handler(struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp) |
| 162 | { |
| 163 | struct tcphdr *tcph; |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 164 | unsigned int tcphoff; |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 165 | int oldlen; |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 166 | |
| 167 | #ifdef CONFIG_IP_VS_IPV6 |
| 168 | if (cp->af == AF_INET6) |
| 169 | tcphoff = sizeof(struct ipv6hdr); |
| 170 | else |
| 171 | #endif |
| 172 | tcphoff = ip_hdrlen(skb); |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 173 | oldlen = skb->len - tcphoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | |
| 175 | /* csum_check requires unshared skb */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 176 | if (!skb_make_writable(skb, tcphoff+sizeof(*tcph))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | return 0; |
| 178 | |
| 179 | if (unlikely(cp->app != NULL)) { |
| 180 | /* Some checks before mangling */ |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 181 | if (pp->csum_check && !pp->csum_check(cp->af, skb, pp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | return 0; |
| 183 | |
| 184 | /* Call application helper if needed */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 185 | if (!ip_vs_app_pkt_out(cp, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | return 0; |
| 187 | } |
| 188 | |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 189 | tcph = (void *)skb_network_header(skb) + tcphoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | tcph->source = cp->vport; |
| 191 | |
| 192 | /* Adjust TCP checksums */ |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 193 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| 194 | tcp_partial_csum_update(cp->af, tcph, &cp->daddr, &cp->vaddr, |
| 195 | htonl(oldlen), |
| 196 | htonl(skb->len - tcphoff)); |
| 197 | } else if (!cp->app) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | /* Only port and addr are changed, do fast csum update */ |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 199 | tcp_fast_csum_update(cp->af, tcph, &cp->daddr, &cp->vaddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | cp->dport, cp->vport); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 201 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
| 202 | skb->ip_summed = CHECKSUM_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | } else { |
| 204 | /* full checksum calculation */ |
| 205 | tcph->check = 0; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 206 | skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0); |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 207 | #ifdef CONFIG_IP_VS_IPV6 |
| 208 | if (cp->af == AF_INET6) |
| 209 | tcph->check = csum_ipv6_magic(&cp->vaddr.in6, |
| 210 | &cp->caddr.in6, |
| 211 | skb->len - tcphoff, |
| 212 | cp->protocol, skb->csum); |
| 213 | else |
| 214 | #endif |
| 215 | tcph->check = csum_tcpudp_magic(cp->vaddr.ip, |
| 216 | cp->caddr.ip, |
| 217 | skb->len - tcphoff, |
| 218 | cp->protocol, |
| 219 | skb->csum); |
| 220 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | IP_VS_DBG(11, "O-pkt: %s O-csum=%d (+%zd)\n", |
| 222 | pp->name, tcph->check, |
| 223 | (char*)&(tcph->check) - (char*)tcph); |
| 224 | } |
| 225 | return 1; |
| 226 | } |
| 227 | |
| 228 | |
| 229 | static int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 230 | tcp_dnat_handler(struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp) |
| 232 | { |
| 233 | struct tcphdr *tcph; |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 234 | unsigned int tcphoff; |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 235 | int oldlen; |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 236 | |
| 237 | #ifdef CONFIG_IP_VS_IPV6 |
| 238 | if (cp->af == AF_INET6) |
| 239 | tcphoff = sizeof(struct ipv6hdr); |
| 240 | else |
| 241 | #endif |
| 242 | tcphoff = ip_hdrlen(skb); |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 243 | oldlen = skb->len - tcphoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
| 245 | /* csum_check requires unshared skb */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 246 | if (!skb_make_writable(skb, tcphoff+sizeof(*tcph))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | return 0; |
| 248 | |
| 249 | if (unlikely(cp->app != NULL)) { |
| 250 | /* Some checks before mangling */ |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 251 | if (pp->csum_check && !pp->csum_check(cp->af, skb, pp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | return 0; |
| 253 | |
| 254 | /* |
| 255 | * Attempt ip_vs_app call. |
| 256 | * It will fix ip_vs_conn and iph ack_seq stuff |
| 257 | */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 258 | if (!ip_vs_app_pkt_in(cp, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | return 0; |
| 260 | } |
| 261 | |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 262 | tcph = (void *)skb_network_header(skb) + tcphoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | tcph->dest = cp->dport; |
| 264 | |
| 265 | /* |
| 266 | * Adjust TCP checksums |
| 267 | */ |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 268 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| 269 | tcp_partial_csum_update(cp->af, tcph, &cp->daddr, &cp->vaddr, |
| 270 | htonl(oldlen), |
| 271 | htonl(skb->len - tcphoff)); |
| 272 | } else if (!cp->app) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | /* Only port and addr are changed, do fast csum update */ |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 274 | tcp_fast_csum_update(cp->af, tcph, &cp->vaddr, &cp->daddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | cp->vport, cp->dport); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 276 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
| 277 | skb->ip_summed = CHECKSUM_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | } else { |
| 279 | /* full checksum calculation */ |
| 280 | tcph->check = 0; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 281 | skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0); |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 282 | #ifdef CONFIG_IP_VS_IPV6 |
| 283 | if (cp->af == AF_INET6) |
| 284 | tcph->check = csum_ipv6_magic(&cp->caddr.in6, |
| 285 | &cp->daddr.in6, |
| 286 | skb->len - tcphoff, |
| 287 | cp->protocol, skb->csum); |
| 288 | else |
| 289 | #endif |
| 290 | tcph->check = csum_tcpudp_magic(cp->caddr.ip, |
| 291 | cp->daddr.ip, |
| 292 | skb->len - tcphoff, |
| 293 | cp->protocol, |
| 294 | skb->csum); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 295 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | } |
| 297 | return 1; |
| 298 | } |
| 299 | |
| 300 | |
| 301 | static int |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 302 | tcp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | { |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 304 | unsigned int tcphoff; |
| 305 | |
| 306 | #ifdef CONFIG_IP_VS_IPV6 |
| 307 | if (af == AF_INET6) |
| 308 | tcphoff = sizeof(struct ipv6hdr); |
| 309 | else |
| 310 | #endif |
| 311 | tcphoff = ip_hdrlen(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
| 313 | switch (skb->ip_summed) { |
| 314 | case CHECKSUM_NONE: |
| 315 | skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0); |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 316 | case CHECKSUM_COMPLETE: |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 317 | #ifdef CONFIG_IP_VS_IPV6 |
| 318 | if (af == AF_INET6) { |
| 319 | if (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, |
| 320 | &ipv6_hdr(skb)->daddr, |
| 321 | skb->len - tcphoff, |
| 322 | ipv6_hdr(skb)->nexthdr, |
| 323 | skb->csum)) { |
| 324 | IP_VS_DBG_RL_PKT(0, pp, skb, 0, |
| 325 | "Failed checksum for"); |
| 326 | return 0; |
| 327 | } |
| 328 | } else |
| 329 | #endif |
| 330 | if (csum_tcpudp_magic(ip_hdr(skb)->saddr, |
| 331 | ip_hdr(skb)->daddr, |
| 332 | skb->len - tcphoff, |
| 333 | ip_hdr(skb)->protocol, |
| 334 | skb->csum)) { |
| 335 | IP_VS_DBG_RL_PKT(0, pp, skb, 0, |
| 336 | "Failed checksum for"); |
| 337 | return 0; |
| 338 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | break; |
| 340 | default: |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 341 | /* No need to checksum. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | break; |
| 343 | } |
| 344 | |
| 345 | return 1; |
| 346 | } |
| 347 | |
| 348 | |
| 349 | #define TCP_DIR_INPUT 0 |
| 350 | #define TCP_DIR_OUTPUT 4 |
| 351 | #define TCP_DIR_INPUT_ONLY 8 |
| 352 | |
Arjan van de Ven | 9b5b5cf | 2005-11-29 16:21:38 -0800 | [diff] [blame] | 353 | static const int tcp_state_off[IP_VS_DIR_LAST] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | [IP_VS_DIR_INPUT] = TCP_DIR_INPUT, |
| 355 | [IP_VS_DIR_OUTPUT] = TCP_DIR_OUTPUT, |
| 356 | [IP_VS_DIR_INPUT_ONLY] = TCP_DIR_INPUT_ONLY, |
| 357 | }; |
| 358 | |
| 359 | /* |
| 360 | * Timeout table[state] |
| 361 | */ |
| 362 | static int tcp_timeouts[IP_VS_TCP_S_LAST+1] = { |
| 363 | [IP_VS_TCP_S_NONE] = 2*HZ, |
| 364 | [IP_VS_TCP_S_ESTABLISHED] = 15*60*HZ, |
| 365 | [IP_VS_TCP_S_SYN_SENT] = 2*60*HZ, |
| 366 | [IP_VS_TCP_S_SYN_RECV] = 1*60*HZ, |
| 367 | [IP_VS_TCP_S_FIN_WAIT] = 2*60*HZ, |
| 368 | [IP_VS_TCP_S_TIME_WAIT] = 2*60*HZ, |
| 369 | [IP_VS_TCP_S_CLOSE] = 10*HZ, |
| 370 | [IP_VS_TCP_S_CLOSE_WAIT] = 60*HZ, |
| 371 | [IP_VS_TCP_S_LAST_ACK] = 30*HZ, |
| 372 | [IP_VS_TCP_S_LISTEN] = 2*60*HZ, |
| 373 | [IP_VS_TCP_S_SYNACK] = 120*HZ, |
| 374 | [IP_VS_TCP_S_LAST] = 2*HZ, |
| 375 | }; |
| 376 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | static char * tcp_state_name_table[IP_VS_TCP_S_LAST+1] = { |
| 378 | [IP_VS_TCP_S_NONE] = "NONE", |
| 379 | [IP_VS_TCP_S_ESTABLISHED] = "ESTABLISHED", |
| 380 | [IP_VS_TCP_S_SYN_SENT] = "SYN_SENT", |
| 381 | [IP_VS_TCP_S_SYN_RECV] = "SYN_RECV", |
| 382 | [IP_VS_TCP_S_FIN_WAIT] = "FIN_WAIT", |
| 383 | [IP_VS_TCP_S_TIME_WAIT] = "TIME_WAIT", |
| 384 | [IP_VS_TCP_S_CLOSE] = "CLOSE", |
| 385 | [IP_VS_TCP_S_CLOSE_WAIT] = "CLOSE_WAIT", |
| 386 | [IP_VS_TCP_S_LAST_ACK] = "LAST_ACK", |
| 387 | [IP_VS_TCP_S_LISTEN] = "LISTEN", |
| 388 | [IP_VS_TCP_S_SYNACK] = "SYNACK", |
| 389 | [IP_VS_TCP_S_LAST] = "BUG!", |
| 390 | }; |
| 391 | |
| 392 | #define sNO IP_VS_TCP_S_NONE |
| 393 | #define sES IP_VS_TCP_S_ESTABLISHED |
| 394 | #define sSS IP_VS_TCP_S_SYN_SENT |
| 395 | #define sSR IP_VS_TCP_S_SYN_RECV |
| 396 | #define sFW IP_VS_TCP_S_FIN_WAIT |
| 397 | #define sTW IP_VS_TCP_S_TIME_WAIT |
| 398 | #define sCL IP_VS_TCP_S_CLOSE |
| 399 | #define sCW IP_VS_TCP_S_CLOSE_WAIT |
| 400 | #define sLA IP_VS_TCP_S_LAST_ACK |
| 401 | #define sLI IP_VS_TCP_S_LISTEN |
| 402 | #define sSA IP_VS_TCP_S_SYNACK |
| 403 | |
| 404 | struct tcp_states_t { |
| 405 | int next_state[IP_VS_TCP_S_LAST]; |
| 406 | }; |
| 407 | |
| 408 | static const char * tcp_state_name(int state) |
| 409 | { |
| 410 | if (state >= IP_VS_TCP_S_LAST) |
| 411 | return "ERR!"; |
| 412 | return tcp_state_name_table[state] ? tcp_state_name_table[state] : "?"; |
| 413 | } |
| 414 | |
| 415 | static struct tcp_states_t tcp_states [] = { |
| 416 | /* INPUT */ |
| 417 | /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */ |
| 418 | /*syn*/ {{sSR, sES, sES, sSR, sSR, sSR, sSR, sSR, sSR, sSR, sSR }}, |
| 419 | /*fin*/ {{sCL, sCW, sSS, sTW, sTW, sTW, sCL, sCW, sLA, sLI, sTW }}, |
| 420 | /*ack*/ {{sCL, sES, sSS, sES, sFW, sTW, sCL, sCW, sCL, sLI, sES }}, |
| 421 | /*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sSR }}, |
| 422 | |
| 423 | /* OUTPUT */ |
| 424 | /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */ |
| 425 | /*syn*/ {{sSS, sES, sSS, sSR, sSS, sSS, sSS, sSS, sSS, sLI, sSR }}, |
| 426 | /*fin*/ {{sTW, sFW, sSS, sTW, sFW, sTW, sCL, sTW, sLA, sLI, sTW }}, |
| 427 | /*ack*/ {{sES, sES, sSS, sES, sFW, sTW, sCL, sCW, sLA, sES, sES }}, |
| 428 | /*rst*/ {{sCL, sCL, sSS, sCL, sCL, sTW, sCL, sCL, sCL, sCL, sCL }}, |
| 429 | |
| 430 | /* INPUT-ONLY */ |
| 431 | /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */ |
| 432 | /*syn*/ {{sSR, sES, sES, sSR, sSR, sSR, sSR, sSR, sSR, sSR, sSR }}, |
| 433 | /*fin*/ {{sCL, sFW, sSS, sTW, sFW, sTW, sCL, sCW, sLA, sLI, sTW }}, |
| 434 | /*ack*/ {{sCL, sES, sSS, sES, sFW, sTW, sCL, sCW, sCL, sLI, sES }}, |
| 435 | /*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sCL }}, |
| 436 | }; |
| 437 | |
| 438 | static struct tcp_states_t tcp_states_dos [] = { |
| 439 | /* INPUT */ |
| 440 | /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */ |
| 441 | /*syn*/ {{sSR, sES, sES, sSR, sSR, sSR, sSR, sSR, sSR, sSR, sSA }}, |
| 442 | /*fin*/ {{sCL, sCW, sSS, sTW, sTW, sTW, sCL, sCW, sLA, sLI, sSA }}, |
| 443 | /*ack*/ {{sCL, sES, sSS, sSR, sFW, sTW, sCL, sCW, sCL, sLI, sSA }}, |
| 444 | /*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sCL }}, |
| 445 | |
| 446 | /* OUTPUT */ |
| 447 | /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */ |
| 448 | /*syn*/ {{sSS, sES, sSS, sSA, sSS, sSS, sSS, sSS, sSS, sLI, sSA }}, |
| 449 | /*fin*/ {{sTW, sFW, sSS, sTW, sFW, sTW, sCL, sTW, sLA, sLI, sTW }}, |
| 450 | /*ack*/ {{sES, sES, sSS, sES, sFW, sTW, sCL, sCW, sLA, sES, sES }}, |
| 451 | /*rst*/ {{sCL, sCL, sSS, sCL, sCL, sTW, sCL, sCL, sCL, sCL, sCL }}, |
| 452 | |
| 453 | /* INPUT-ONLY */ |
| 454 | /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */ |
| 455 | /*syn*/ {{sSA, sES, sES, sSR, sSA, sSA, sSA, sSA, sSA, sSA, sSA }}, |
| 456 | /*fin*/ {{sCL, sFW, sSS, sTW, sFW, sTW, sCL, sCW, sLA, sLI, sTW }}, |
| 457 | /*ack*/ {{sCL, sES, sSS, sES, sFW, sTW, sCL, sCW, sCL, sLI, sES }}, |
| 458 | /*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sCL }}, |
| 459 | }; |
| 460 | |
| 461 | static struct tcp_states_t *tcp_state_table = tcp_states; |
| 462 | |
| 463 | |
| 464 | static void tcp_timeout_change(struct ip_vs_protocol *pp, int flags) |
| 465 | { |
| 466 | int on = (flags & 1); /* secure_tcp */ |
| 467 | |
| 468 | /* |
| 469 | ** FIXME: change secure_tcp to independent sysctl var |
| 470 | ** or make it per-service or per-app because it is valid |
| 471 | ** for most if not for all of the applications. Something |
| 472 | ** like "capabilities" (flags) for each object. |
| 473 | */ |
| 474 | tcp_state_table = (on? tcp_states_dos : tcp_states); |
| 475 | } |
| 476 | |
| 477 | static int |
| 478 | tcp_set_state_timeout(struct ip_vs_protocol *pp, char *sname, int to) |
| 479 | { |
| 480 | return ip_vs_set_state_timeout(pp->timeout_table, IP_VS_TCP_S_LAST, |
| 481 | tcp_state_name_table, sname, to); |
| 482 | } |
| 483 | |
| 484 | static inline int tcp_state_idx(struct tcphdr *th) |
| 485 | { |
| 486 | if (th->rst) |
| 487 | return 3; |
| 488 | if (th->syn) |
| 489 | return 0; |
| 490 | if (th->fin) |
| 491 | return 1; |
| 492 | if (th->ack) |
| 493 | return 2; |
| 494 | return -1; |
| 495 | } |
| 496 | |
| 497 | static inline void |
| 498 | set_tcp_state(struct ip_vs_protocol *pp, struct ip_vs_conn *cp, |
| 499 | int direction, struct tcphdr *th) |
| 500 | { |
| 501 | int state_idx; |
| 502 | int new_state = IP_VS_TCP_S_CLOSE; |
| 503 | int state_off = tcp_state_off[direction]; |
| 504 | |
| 505 | /* |
| 506 | * Update state offset to INPUT_ONLY if necessary |
| 507 | * or delete NO_OUTPUT flag if output packet detected |
| 508 | */ |
| 509 | if (cp->flags & IP_VS_CONN_F_NOOUTPUT) { |
| 510 | if (state_off == TCP_DIR_OUTPUT) |
| 511 | cp->flags &= ~IP_VS_CONN_F_NOOUTPUT; |
| 512 | else |
| 513 | state_off = TCP_DIR_INPUT_ONLY; |
| 514 | } |
| 515 | |
| 516 | if ((state_idx = tcp_state_idx(th)) < 0) { |
| 517 | IP_VS_DBG(8, "tcp_state_idx=%d!!!\n", state_idx); |
| 518 | goto tcp_state_out; |
| 519 | } |
| 520 | |
| 521 | new_state = tcp_state_table[state_off+state_idx].next_state[cp->state]; |
| 522 | |
| 523 | tcp_state_out: |
| 524 | if (new_state != cp->state) { |
| 525 | struct ip_vs_dest *dest = cp->dest; |
| 526 | |
Julius Volz | cfc78c5 | 2008-09-02 15:55:53 +0200 | [diff] [blame] | 527 | IP_VS_DBG_BUF(8, "%s %s [%c%c%c%c] %s:%d->" |
| 528 | "%s:%d state: %s->%s conn->refcnt:%d\n", |
| 529 | pp->name, |
| 530 | ((state_off == TCP_DIR_OUTPUT) ? |
| 531 | "output " : "input "), |
| 532 | th->syn ? 'S' : '.', |
| 533 | th->fin ? 'F' : '.', |
| 534 | th->ack ? 'A' : '.', |
| 535 | th->rst ? 'R' : '.', |
| 536 | IP_VS_DBG_ADDR(cp->af, &cp->daddr), |
| 537 | ntohs(cp->dport), |
| 538 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), |
| 539 | ntohs(cp->cport), |
| 540 | tcp_state_name(cp->state), |
| 541 | tcp_state_name(new_state), |
| 542 | atomic_read(&cp->refcnt)); |
| 543 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | if (dest) { |
| 545 | if (!(cp->flags & IP_VS_CONN_F_INACTIVE) && |
| 546 | (new_state != IP_VS_TCP_S_ESTABLISHED)) { |
| 547 | atomic_dec(&dest->activeconns); |
| 548 | atomic_inc(&dest->inactconns); |
| 549 | cp->flags |= IP_VS_CONN_F_INACTIVE; |
| 550 | } else if ((cp->flags & IP_VS_CONN_F_INACTIVE) && |
| 551 | (new_state == IP_VS_TCP_S_ESTABLISHED)) { |
| 552 | atomic_inc(&dest->activeconns); |
| 553 | atomic_dec(&dest->inactconns); |
| 554 | cp->flags &= ~IP_VS_CONN_F_INACTIVE; |
| 555 | } |
| 556 | } |
| 557 | } |
| 558 | |
| 559 | cp->timeout = pp->timeout_table[cp->state = new_state]; |
| 560 | } |
| 561 | |
| 562 | |
| 563 | /* |
| 564 | * Handle state transitions |
| 565 | */ |
| 566 | static int |
| 567 | tcp_state_transition(struct ip_vs_conn *cp, int direction, |
| 568 | const struct sk_buff *skb, |
| 569 | struct ip_vs_protocol *pp) |
| 570 | { |
| 571 | struct tcphdr _tcph, *th; |
| 572 | |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 573 | #ifdef CONFIG_IP_VS_IPV6 |
| 574 | int ihl = cp->af == AF_INET ? ip_hdrlen(skb) : sizeof(struct ipv6hdr); |
| 575 | #else |
| 576 | int ihl = ip_hdrlen(skb); |
| 577 | #endif |
| 578 | |
| 579 | th = skb_header_pointer(skb, ihl, sizeof(_tcph), &_tcph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | if (th == NULL) |
| 581 | return 0; |
| 582 | |
| 583 | spin_lock(&cp->lock); |
| 584 | set_tcp_state(pp, cp, direction, th); |
| 585 | spin_unlock(&cp->lock); |
| 586 | |
| 587 | return 1; |
| 588 | } |
| 589 | |
| 590 | |
| 591 | /* |
| 592 | * Hash table for TCP application incarnations |
| 593 | */ |
| 594 | #define TCP_APP_TAB_BITS 4 |
| 595 | #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS) |
| 596 | #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1) |
| 597 | |
| 598 | static struct list_head tcp_apps[TCP_APP_TAB_SIZE]; |
| 599 | static DEFINE_SPINLOCK(tcp_app_lock); |
| 600 | |
Al Viro | 75e7ce6 | 2006-11-14 21:13:28 -0800 | [diff] [blame] | 601 | static inline __u16 tcp_app_hashkey(__be16 port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | { |
Al Viro | 75e7ce6 | 2006-11-14 21:13:28 -0800 | [diff] [blame] | 603 | return (((__force u16)port >> TCP_APP_TAB_BITS) ^ (__force u16)port) |
| 604 | & TCP_APP_TAB_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | } |
| 606 | |
| 607 | |
| 608 | static int tcp_register_app(struct ip_vs_app *inc) |
| 609 | { |
| 610 | struct ip_vs_app *i; |
Al Viro | 75e7ce6 | 2006-11-14 21:13:28 -0800 | [diff] [blame] | 611 | __u16 hash; |
| 612 | __be16 port = inc->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | int ret = 0; |
| 614 | |
| 615 | hash = tcp_app_hashkey(port); |
| 616 | |
| 617 | spin_lock_bh(&tcp_app_lock); |
| 618 | list_for_each_entry(i, &tcp_apps[hash], p_list) { |
| 619 | if (i->port == port) { |
| 620 | ret = -EEXIST; |
| 621 | goto out; |
| 622 | } |
| 623 | } |
| 624 | list_add(&inc->p_list, &tcp_apps[hash]); |
| 625 | atomic_inc(&ip_vs_protocol_tcp.appcnt); |
| 626 | |
| 627 | out: |
| 628 | spin_unlock_bh(&tcp_app_lock); |
| 629 | return ret; |
| 630 | } |
| 631 | |
| 632 | |
| 633 | static void |
| 634 | tcp_unregister_app(struct ip_vs_app *inc) |
| 635 | { |
| 636 | spin_lock_bh(&tcp_app_lock); |
| 637 | atomic_dec(&ip_vs_protocol_tcp.appcnt); |
| 638 | list_del(&inc->p_list); |
| 639 | spin_unlock_bh(&tcp_app_lock); |
| 640 | } |
| 641 | |
| 642 | |
| 643 | static int |
| 644 | tcp_app_conn_bind(struct ip_vs_conn *cp) |
| 645 | { |
| 646 | int hash; |
| 647 | struct ip_vs_app *inc; |
| 648 | int result = 0; |
| 649 | |
| 650 | /* Default binding: bind app only for NAT */ |
| 651 | if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) |
| 652 | return 0; |
| 653 | |
| 654 | /* Lookup application incarnations and bind the right one */ |
| 655 | hash = tcp_app_hashkey(cp->vport); |
| 656 | |
| 657 | spin_lock(&tcp_app_lock); |
| 658 | list_for_each_entry(inc, &tcp_apps[hash], p_list) { |
| 659 | if (inc->port == cp->vport) { |
| 660 | if (unlikely(!ip_vs_app_inc_get(inc))) |
| 661 | break; |
| 662 | spin_unlock(&tcp_app_lock); |
| 663 | |
Julius Volz | cfc78c5 | 2008-09-02 15:55:53 +0200 | [diff] [blame] | 664 | IP_VS_DBG_BUF(9, "%s: Binding conn %s:%u->" |
| 665 | "%s:%u to app %s on port %u\n", |
| 666 | __func__, |
| 667 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), |
| 668 | ntohs(cp->cport), |
| 669 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), |
| 670 | ntohs(cp->vport), |
| 671 | inc->name, ntohs(inc->port)); |
| 672 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | cp->app = inc; |
| 674 | if (inc->init_conn) |
| 675 | result = inc->init_conn(inc, cp); |
| 676 | goto out; |
| 677 | } |
| 678 | } |
| 679 | spin_unlock(&tcp_app_lock); |
| 680 | |
| 681 | out: |
| 682 | return result; |
| 683 | } |
| 684 | |
| 685 | |
| 686 | /* |
| 687 | * Set LISTEN timeout. (ip_vs_conn_put will setup timer) |
| 688 | */ |
| 689 | void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp) |
| 690 | { |
| 691 | spin_lock(&cp->lock); |
| 692 | cp->state = IP_VS_TCP_S_LISTEN; |
| 693 | cp->timeout = ip_vs_protocol_tcp.timeout_table[IP_VS_TCP_S_LISTEN]; |
| 694 | spin_unlock(&cp->lock); |
| 695 | } |
| 696 | |
| 697 | |
David S. Miller | ba602a8 | 2005-08-16 20:50:16 -0700 | [diff] [blame] | 698 | static void ip_vs_tcp_init(struct ip_vs_protocol *pp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | { |
| 700 | IP_VS_INIT_HASH_TABLE(tcp_apps); |
| 701 | pp->timeout_table = tcp_timeouts; |
| 702 | } |
| 703 | |
| 704 | |
David S. Miller | ba602a8 | 2005-08-16 20:50:16 -0700 | [diff] [blame] | 705 | static void ip_vs_tcp_exit(struct ip_vs_protocol *pp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | { |
| 707 | } |
| 708 | |
| 709 | |
| 710 | struct ip_vs_protocol ip_vs_protocol_tcp = { |
| 711 | .name = "TCP", |
| 712 | .protocol = IPPROTO_TCP, |
Julian Anastasov | 2ad17de | 2008-04-29 03:21:23 -0700 | [diff] [blame] | 713 | .num_states = IP_VS_TCP_S_LAST, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | .dont_defrag = 0, |
| 715 | .appcnt = ATOMIC_INIT(0), |
David S. Miller | ba602a8 | 2005-08-16 20:50:16 -0700 | [diff] [blame] | 716 | .init = ip_vs_tcp_init, |
| 717 | .exit = ip_vs_tcp_exit, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | .register_app = tcp_register_app, |
| 719 | .unregister_app = tcp_unregister_app, |
| 720 | .conn_schedule = tcp_conn_schedule, |
| 721 | .conn_in_get = tcp_conn_in_get, |
| 722 | .conn_out_get = tcp_conn_out_get, |
| 723 | .snat_handler = tcp_snat_handler, |
| 724 | .dnat_handler = tcp_dnat_handler, |
| 725 | .csum_check = tcp_csum_check, |
| 726 | .state_name = tcp_state_name, |
| 727 | .state_transition = tcp_state_transition, |
| 728 | .app_conn_bind = tcp_app_conn_bind, |
| 729 | .debug_packet = ip_vs_tcpudp_debug_packet, |
| 730 | .timeout_change = tcp_timeout_change, |
| 731 | .set_state_timeout = tcp_set_state_timeout, |
| 732 | }; |