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 | * |
Hans Schillstrom | 4a85b96 | 2011-01-03 14:44:47 +0100 | [diff] [blame] | 12 | * Changes: Hans Schillstrom <hans.schillstrom@ericsson.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * |
Hans Schillstrom | 4a85b96 | 2011-01-03 14:44:47 +0100 | [diff] [blame] | 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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | */ |
| 19 | |
Hannes Eder | 9aada7a | 2009-07-30 14:29:44 -0700 | [diff] [blame] | 20 | #define KMSG_COMPONENT "IPVS" |
| 21 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 22 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/kernel.h> |
| 24 | #include <linux/ip.h> |
| 25 | #include <linux/tcp.h> /* for tcphdr */ |
| 26 | #include <net/ip.h> |
| 27 | #include <net/tcp.h> /* for csum_tcpudp_magic */ |
Stephen Rothwell | 63f2c04 | 2008-09-12 23:23:50 -0700 | [diff] [blame] | 28 | #include <net/ip6_checksum.h> |
Herbert Xu | af1e1cf | 2007-10-14 00:39:33 -0700 | [diff] [blame] | 29 | #include <linux/netfilter.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/netfilter_ipv4.h> |
| 31 | |
| 32 | #include <net/ip_vs.h> |
| 33 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | static int |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 35 | tcp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd, |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 36 | int *verdict, struct ip_vs_conn **cpp, |
| 37 | struct ip_vs_iphdr *iph) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | { |
Hans Schillstrom | fc72325 | 2011-01-03 14:44:43 +0100 | [diff] [blame] | 39 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | struct ip_vs_service *svc; |
| 41 | struct tcphdr _tcph, *th; |
Alexander Frolkin | c6c96c1 | 2013-06-13 08:56:15 +0100 | [diff] [blame] | 42 | struct netns_ipvs *ipvs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 44 | th = skb_header_pointer(skb, iph->len, sizeof(_tcph), &_tcph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | if (th == NULL) { |
| 46 | *verdict = NF_DROP; |
| 47 | return 0; |
| 48 | } |
Hans Schillstrom | fc72325 | 2011-01-03 14:44:43 +0100 | [diff] [blame] | 49 | net = skb_net(skb); |
Alexander Frolkin | c6c96c1 | 2013-06-13 08:56:15 +0100 | [diff] [blame] | 50 | ipvs = net_ipvs(net); |
Julian Anastasov | 190ecd2 | 2010-10-17 16:24:37 +0300 | [diff] [blame] | 51 | /* No !th->ack check to allow scheduling on SYN+ACK for Active FTP */ |
Julian Anastasov | ceec4c3 | 2013-03-22 11:46:53 +0200 | [diff] [blame] | 52 | rcu_read_lock(); |
Alexander Frolkin | c6c96c1 | 2013-06-13 08:56:15 +0100 | [diff] [blame] | 53 | if ((th->syn || sysctl_sloppy_tcp(ipvs)) && !th->rst && |
Julian Anastasov | ceec4c3 | 2013-03-22 11:46:53 +0200 | [diff] [blame] | 54 | (svc = ip_vs_service_find(net, af, skb->mark, iph->protocol, |
| 55 | &iph->daddr, th->dest))) { |
Julian Anastasov | 190ecd2 | 2010-10-17 16:24:37 +0300 | [diff] [blame] | 56 | int ignored; |
| 57 | |
Alexander Frolkin | c6c96c1 | 2013-06-13 08:56:15 +0100 | [diff] [blame] | 58 | if (ip_vs_todrop(ipvs)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | /* |
| 60 | * It seems that we are very loaded. |
| 61 | * We have to drop this packet :( |
| 62 | */ |
Julian Anastasov | ceec4c3 | 2013-03-22 11:46:53 +0200 | [diff] [blame] | 63 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | *verdict = NF_DROP; |
| 65 | return 0; |
| 66 | } |
| 67 | |
| 68 | /* |
| 69 | * Let the virtual server select a real server for the |
| 70 | * incoming connection, and create a connection entry. |
| 71 | */ |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 72 | *cpp = ip_vs_schedule(svc, skb, pd, &ignored, iph); |
Hans Schillstrom | a5959d5 | 2010-11-19 14:25:10 +0100 | [diff] [blame] | 73 | if (!*cpp && ignored <= 0) { |
| 74 | if (!ignored) |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 75 | *verdict = ip_vs_leave(svc, skb, pd, iph); |
Julian Anastasov | ceec4c3 | 2013-03-22 11:46:53 +0200 | [diff] [blame] | 76 | else |
Hans Schillstrom | a5959d5 | 2010-11-19 14:25:10 +0100 | [diff] [blame] | 77 | *verdict = NF_DROP; |
Julian Anastasov | ceec4c3 | 2013-03-22 11:46:53 +0200 | [diff] [blame] | 78 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | return 0; |
| 80 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | } |
Julian Anastasov | ceec4c3 | 2013-03-22 11:46:53 +0200 | [diff] [blame] | 82 | rcu_read_unlock(); |
Hans Schillstrom | a5959d5 | 2010-11-19 14:25:10 +0100 | [diff] [blame] | 83 | /* NF_ACCEPT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | return 1; |
| 85 | } |
| 86 | |
| 87 | |
| 88 | static inline void |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 89 | tcp_fast_csum_update(int af, struct tcphdr *tcph, |
| 90 | const union nf_inet_addr *oldip, |
| 91 | const union nf_inet_addr *newip, |
Al Viro | 014d730 | 2006-09-28 14:29:52 -0700 | [diff] [blame] | 92 | __be16 oldport, __be16 newport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | { |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 94 | #ifdef CONFIG_IP_VS_IPV6 |
| 95 | if (af == AF_INET6) |
| 96 | tcph->check = |
| 97 | csum_fold(ip_vs_check_diff16(oldip->ip6, newip->ip6, |
| 98 | ip_vs_check_diff2(oldport, newport, |
| 99 | ~csum_unfold(tcph->check)))); |
| 100 | else |
| 101 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | tcph->check = |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 103 | csum_fold(ip_vs_check_diff4(oldip->ip, newip->ip, |
Al Viro | f9214b2 | 2006-11-16 02:41:18 -0800 | [diff] [blame] | 104 | ip_vs_check_diff2(oldport, newport, |
| 105 | ~csum_unfold(tcph->check)))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | } |
| 107 | |
| 108 | |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 109 | static inline void |
| 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) |
| 114 | { |
| 115 | #ifdef CONFIG_IP_VS_IPV6 |
| 116 | if (af == AF_INET6) |
| 117 | tcph->check = |
Julian Anastasov | 5bc9068 | 2010-10-17 16:14:31 +0300 | [diff] [blame] | 118 | ~csum_fold(ip_vs_check_diff16(oldip->ip6, newip->ip6, |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 119 | ip_vs_check_diff2(oldlen, newlen, |
Julian Anastasov | 5bc9068 | 2010-10-17 16:14:31 +0300 | [diff] [blame] | 120 | csum_unfold(tcph->check)))); |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 121 | else |
| 122 | #endif |
| 123 | tcph->check = |
Julian Anastasov | 5bc9068 | 2010-10-17 16:14:31 +0300 | [diff] [blame] | 124 | ~csum_fold(ip_vs_check_diff4(oldip->ip, newip->ip, |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 125 | ip_vs_check_diff2(oldlen, newlen, |
Julian Anastasov | 5bc9068 | 2010-10-17 16:14:31 +0300 | [diff] [blame] | 126 | csum_unfold(tcph->check)))); |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 127 | } |
| 128 | |
| 129 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | static int |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 131 | tcp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp, |
| 132 | struct ip_vs_conn *cp, struct ip_vs_iphdr *iph) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | { |
| 134 | struct tcphdr *tcph; |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 135 | unsigned int tcphoff = iph->len; |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 136 | int oldlen; |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 137 | int payload_csum = 0; |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 138 | |
| 139 | #ifdef CONFIG_IP_VS_IPV6 |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 140 | if (cp->af == AF_INET6 && iph->fragoffs) |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 141 | return 1; |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 142 | #endif |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 143 | oldlen = skb->len - tcphoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
| 145 | /* csum_check requires unshared skb */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 146 | if (!skb_make_writable(skb, tcphoff+sizeof(*tcph))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | return 0; |
| 148 | |
| 149 | if (unlikely(cp->app != NULL)) { |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 150 | int ret; |
| 151 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | /* Some checks before mangling */ |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 153 | if (pp->csum_check && !pp->csum_check(cp->af, skb, pp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | return 0; |
| 155 | |
| 156 | /* Call application helper if needed */ |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 157 | if (!(ret = ip_vs_app_pkt_out(cp, skb))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | return 0; |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 159 | /* ret=2: csum update is needed after payload mangling */ |
| 160 | if (ret == 1) |
| 161 | oldlen = skb->len - tcphoff; |
| 162 | else |
| 163 | payload_csum = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | } |
| 165 | |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 166 | tcph = (void *)skb_network_header(skb) + tcphoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | tcph->source = cp->vport; |
| 168 | |
| 169 | /* Adjust TCP checksums */ |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 170 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| 171 | tcp_partial_csum_update(cp->af, tcph, &cp->daddr, &cp->vaddr, |
Harvey Harrison | ca62059 | 2008-11-06 23:09:56 -0800 | [diff] [blame] | 172 | htons(oldlen), |
| 173 | htons(skb->len - tcphoff)); |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 174 | } else if (!payload_csum) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | /* Only port and addr are changed, do fast csum update */ |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 176 | tcp_fast_csum_update(cp->af, tcph, &cp->daddr, &cp->vaddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | cp->dport, cp->vport); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 178 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 179 | skb->ip_summed = (cp->app && pp->csum_check) ? |
| 180 | CHECKSUM_UNNECESSARY : CHECKSUM_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | } else { |
| 182 | /* full checksum calculation */ |
| 183 | tcph->check = 0; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 184 | skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0); |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 185 | #ifdef CONFIG_IP_VS_IPV6 |
| 186 | if (cp->af == AF_INET6) |
| 187 | tcph->check = csum_ipv6_magic(&cp->vaddr.in6, |
| 188 | &cp->caddr.in6, |
| 189 | skb->len - tcphoff, |
| 190 | cp->protocol, skb->csum); |
| 191 | else |
| 192 | #endif |
| 193 | tcph->check = csum_tcpudp_magic(cp->vaddr.ip, |
| 194 | cp->caddr.ip, |
| 195 | skb->len - tcphoff, |
| 196 | cp->protocol, |
| 197 | skb->csum); |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 198 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 199 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | IP_VS_DBG(11, "O-pkt: %s O-csum=%d (+%zd)\n", |
| 201 | pp->name, tcph->check, |
| 202 | (char*)&(tcph->check) - (char*)tcph); |
| 203 | } |
| 204 | return 1; |
| 205 | } |
| 206 | |
| 207 | |
| 208 | static int |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 209 | tcp_dnat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp, |
| 210 | struct ip_vs_conn *cp, struct ip_vs_iphdr *iph) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | { |
| 212 | struct tcphdr *tcph; |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 213 | unsigned int tcphoff = iph->len; |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 214 | int oldlen; |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 215 | int payload_csum = 0; |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 216 | |
| 217 | #ifdef CONFIG_IP_VS_IPV6 |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 218 | if (cp->af == AF_INET6 && iph->fragoffs) |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 219 | return 1; |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 220 | #endif |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 221 | oldlen = skb->len - tcphoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | |
| 223 | /* csum_check requires unshared skb */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 224 | if (!skb_make_writable(skb, tcphoff+sizeof(*tcph))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | return 0; |
| 226 | |
| 227 | if (unlikely(cp->app != NULL)) { |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 228 | int ret; |
| 229 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | /* Some checks before mangling */ |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 231 | if (pp->csum_check && !pp->csum_check(cp->af, skb, pp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | return 0; |
| 233 | |
| 234 | /* |
| 235 | * Attempt ip_vs_app call. |
| 236 | * It will fix ip_vs_conn and iph ack_seq stuff |
| 237 | */ |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 238 | if (!(ret = ip_vs_app_pkt_in(cp, skb))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | return 0; |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 240 | /* ret=2: csum update is needed after payload mangling */ |
| 241 | if (ret == 1) |
| 242 | oldlen = skb->len - tcphoff; |
| 243 | else |
| 244 | payload_csum = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | } |
| 246 | |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 247 | tcph = (void *)skb_network_header(skb) + tcphoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | tcph->dest = cp->dport; |
| 249 | |
| 250 | /* |
| 251 | * Adjust TCP checksums |
| 252 | */ |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 253 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
Julian Anastasov | 5bc9068 | 2010-10-17 16:14:31 +0300 | [diff] [blame] | 254 | tcp_partial_csum_update(cp->af, tcph, &cp->vaddr, &cp->daddr, |
Harvey Harrison | ca62059 | 2008-11-06 23:09:56 -0800 | [diff] [blame] | 255 | htons(oldlen), |
| 256 | htons(skb->len - tcphoff)); |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 257 | } else if (!payload_csum) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | /* Only port and addr are changed, do fast csum update */ |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 259 | tcp_fast_csum_update(cp->af, tcph, &cp->vaddr, &cp->daddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | cp->vport, cp->dport); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 261 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 262 | skb->ip_summed = (cp->app && pp->csum_check) ? |
| 263 | CHECKSUM_UNNECESSARY : CHECKSUM_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | } else { |
| 265 | /* full checksum calculation */ |
| 266 | tcph->check = 0; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 267 | skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0); |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 268 | #ifdef CONFIG_IP_VS_IPV6 |
| 269 | if (cp->af == AF_INET6) |
| 270 | tcph->check = csum_ipv6_magic(&cp->caddr.in6, |
| 271 | &cp->daddr.in6, |
| 272 | skb->len - tcphoff, |
| 273 | cp->protocol, skb->csum); |
| 274 | else |
| 275 | #endif |
| 276 | tcph->check = csum_tcpudp_magic(cp->caddr.ip, |
| 277 | cp->daddr.ip, |
| 278 | skb->len - tcphoff, |
| 279 | cp->protocol, |
| 280 | skb->csum); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 281 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | } |
| 283 | return 1; |
| 284 | } |
| 285 | |
| 286 | |
| 287 | static int |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 288 | 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] | 289 | { |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 290 | unsigned int tcphoff; |
| 291 | |
| 292 | #ifdef CONFIG_IP_VS_IPV6 |
| 293 | if (af == AF_INET6) |
| 294 | tcphoff = sizeof(struct ipv6hdr); |
| 295 | else |
| 296 | #endif |
| 297 | tcphoff = ip_hdrlen(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
| 299 | switch (skb->ip_summed) { |
| 300 | case CHECKSUM_NONE: |
| 301 | skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0); |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 302 | case CHECKSUM_COMPLETE: |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 303 | #ifdef CONFIG_IP_VS_IPV6 |
| 304 | if (af == AF_INET6) { |
| 305 | if (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, |
| 306 | &ipv6_hdr(skb)->daddr, |
| 307 | skb->len - tcphoff, |
| 308 | ipv6_hdr(skb)->nexthdr, |
| 309 | skb->csum)) { |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 310 | IP_VS_DBG_RL_PKT(0, af, pp, skb, 0, |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 311 | "Failed checksum for"); |
| 312 | return 0; |
| 313 | } |
| 314 | } else |
| 315 | #endif |
| 316 | if (csum_tcpudp_magic(ip_hdr(skb)->saddr, |
| 317 | ip_hdr(skb)->daddr, |
| 318 | skb->len - tcphoff, |
| 319 | ip_hdr(skb)->protocol, |
| 320 | skb->csum)) { |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 321 | IP_VS_DBG_RL_PKT(0, af, pp, skb, 0, |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 322 | "Failed checksum for"); |
| 323 | return 0; |
| 324 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | break; |
| 326 | default: |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 327 | /* No need to checksum. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | break; |
| 329 | } |
| 330 | |
| 331 | return 1; |
| 332 | } |
| 333 | |
| 334 | |
| 335 | #define TCP_DIR_INPUT 0 |
| 336 | #define TCP_DIR_OUTPUT 4 |
| 337 | #define TCP_DIR_INPUT_ONLY 8 |
| 338 | |
Arjan van de Ven | 9b5b5cf | 2005-11-29 16:21:38 -0800 | [diff] [blame] | 339 | static const int tcp_state_off[IP_VS_DIR_LAST] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | [IP_VS_DIR_INPUT] = TCP_DIR_INPUT, |
| 341 | [IP_VS_DIR_OUTPUT] = TCP_DIR_OUTPUT, |
| 342 | [IP_VS_DIR_INPUT_ONLY] = TCP_DIR_INPUT_ONLY, |
| 343 | }; |
| 344 | |
| 345 | /* |
| 346 | * Timeout table[state] |
| 347 | */ |
Hans Schillstrom | 4a85b96 | 2011-01-03 14:44:47 +0100 | [diff] [blame] | 348 | static const int tcp_timeouts[IP_VS_TCP_S_LAST+1] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | [IP_VS_TCP_S_NONE] = 2*HZ, |
| 350 | [IP_VS_TCP_S_ESTABLISHED] = 15*60*HZ, |
| 351 | [IP_VS_TCP_S_SYN_SENT] = 2*60*HZ, |
| 352 | [IP_VS_TCP_S_SYN_RECV] = 1*60*HZ, |
| 353 | [IP_VS_TCP_S_FIN_WAIT] = 2*60*HZ, |
| 354 | [IP_VS_TCP_S_TIME_WAIT] = 2*60*HZ, |
| 355 | [IP_VS_TCP_S_CLOSE] = 10*HZ, |
| 356 | [IP_VS_TCP_S_CLOSE_WAIT] = 60*HZ, |
| 357 | [IP_VS_TCP_S_LAST_ACK] = 30*HZ, |
| 358 | [IP_VS_TCP_S_LISTEN] = 2*60*HZ, |
| 359 | [IP_VS_TCP_S_SYNACK] = 120*HZ, |
| 360 | [IP_VS_TCP_S_LAST] = 2*HZ, |
| 361 | }; |
| 362 | |
Jan Engelhardt | 36cbd3d | 2009-08-05 10:42:58 -0700 | [diff] [blame] | 363 | static const char *const tcp_state_name_table[IP_VS_TCP_S_LAST+1] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | [IP_VS_TCP_S_NONE] = "NONE", |
| 365 | [IP_VS_TCP_S_ESTABLISHED] = "ESTABLISHED", |
| 366 | [IP_VS_TCP_S_SYN_SENT] = "SYN_SENT", |
| 367 | [IP_VS_TCP_S_SYN_RECV] = "SYN_RECV", |
| 368 | [IP_VS_TCP_S_FIN_WAIT] = "FIN_WAIT", |
| 369 | [IP_VS_TCP_S_TIME_WAIT] = "TIME_WAIT", |
| 370 | [IP_VS_TCP_S_CLOSE] = "CLOSE", |
| 371 | [IP_VS_TCP_S_CLOSE_WAIT] = "CLOSE_WAIT", |
| 372 | [IP_VS_TCP_S_LAST_ACK] = "LAST_ACK", |
| 373 | [IP_VS_TCP_S_LISTEN] = "LISTEN", |
| 374 | [IP_VS_TCP_S_SYNACK] = "SYNACK", |
| 375 | [IP_VS_TCP_S_LAST] = "BUG!", |
| 376 | }; |
| 377 | |
| 378 | #define sNO IP_VS_TCP_S_NONE |
| 379 | #define sES IP_VS_TCP_S_ESTABLISHED |
| 380 | #define sSS IP_VS_TCP_S_SYN_SENT |
| 381 | #define sSR IP_VS_TCP_S_SYN_RECV |
| 382 | #define sFW IP_VS_TCP_S_FIN_WAIT |
| 383 | #define sTW IP_VS_TCP_S_TIME_WAIT |
| 384 | #define sCL IP_VS_TCP_S_CLOSE |
| 385 | #define sCW IP_VS_TCP_S_CLOSE_WAIT |
| 386 | #define sLA IP_VS_TCP_S_LAST_ACK |
| 387 | #define sLI IP_VS_TCP_S_LISTEN |
| 388 | #define sSA IP_VS_TCP_S_SYNACK |
| 389 | |
| 390 | struct tcp_states_t { |
| 391 | int next_state[IP_VS_TCP_S_LAST]; |
| 392 | }; |
| 393 | |
| 394 | static const char * tcp_state_name(int state) |
| 395 | { |
| 396 | if (state >= IP_VS_TCP_S_LAST) |
| 397 | return "ERR!"; |
| 398 | return tcp_state_name_table[state] ? tcp_state_name_table[state] : "?"; |
| 399 | } |
| 400 | |
| 401 | static struct tcp_states_t tcp_states [] = { |
| 402 | /* INPUT */ |
| 403 | /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */ |
| 404 | /*syn*/ {{sSR, sES, sES, sSR, sSR, sSR, sSR, sSR, sSR, sSR, sSR }}, |
| 405 | /*fin*/ {{sCL, sCW, sSS, sTW, sTW, sTW, sCL, sCW, sLA, sLI, sTW }}, |
Alexander Frolkin | c6c96c1 | 2013-06-13 08:56:15 +0100 | [diff] [blame] | 406 | /*ack*/ {{sES, sES, sSS, sES, sFW, sTW, sCL, sCW, sCL, sLI, sES }}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | /*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sSR }}, |
| 408 | |
| 409 | /* OUTPUT */ |
| 410 | /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */ |
| 411 | /*syn*/ {{sSS, sES, sSS, sSR, sSS, sSS, sSS, sSS, sSS, sLI, sSR }}, |
| 412 | /*fin*/ {{sTW, sFW, sSS, sTW, sFW, sTW, sCL, sTW, sLA, sLI, sTW }}, |
| 413 | /*ack*/ {{sES, sES, sSS, sES, sFW, sTW, sCL, sCW, sLA, sES, sES }}, |
| 414 | /*rst*/ {{sCL, sCL, sSS, sCL, sCL, sTW, sCL, sCL, sCL, sCL, sCL }}, |
| 415 | |
| 416 | /* INPUT-ONLY */ |
| 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, sFW, sSS, sTW, sFW, sTW, sCL, sCW, sLA, sLI, sTW }}, |
Alexander Frolkin | c6c96c1 | 2013-06-13 08:56:15 +0100 | [diff] [blame] | 420 | /*ack*/ {{sES, sES, sSS, sES, sFW, sTW, sCL, sCW, sCL, sLI, sES }}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | /*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sCL }}, |
| 422 | }; |
| 423 | |
| 424 | static struct tcp_states_t tcp_states_dos [] = { |
| 425 | /* INPUT */ |
| 426 | /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */ |
| 427 | /*syn*/ {{sSR, sES, sES, sSR, sSR, sSR, sSR, sSR, sSR, sSR, sSA }}, |
| 428 | /*fin*/ {{sCL, sCW, sSS, sTW, sTW, sTW, sCL, sCW, sLA, sLI, sSA }}, |
Alexander Frolkin | c6c96c1 | 2013-06-13 08:56:15 +0100 | [diff] [blame] | 429 | /*ack*/ {{sES, sES, sSS, sSR, sFW, sTW, sCL, sCW, sCL, sLI, sSA }}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | /*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sCL }}, |
| 431 | |
| 432 | /* OUTPUT */ |
| 433 | /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */ |
| 434 | /*syn*/ {{sSS, sES, sSS, sSA, sSS, sSS, sSS, sSS, sSS, sLI, sSA }}, |
| 435 | /*fin*/ {{sTW, sFW, sSS, sTW, sFW, sTW, sCL, sTW, sLA, sLI, sTW }}, |
| 436 | /*ack*/ {{sES, sES, sSS, sES, sFW, sTW, sCL, sCW, sLA, sES, sES }}, |
| 437 | /*rst*/ {{sCL, sCL, sSS, sCL, sCL, sTW, sCL, sCL, sCL, sCL, sCL }}, |
| 438 | |
| 439 | /* INPUT-ONLY */ |
| 440 | /* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */ |
| 441 | /*syn*/ {{sSA, sES, sES, sSR, sSA, sSA, sSA, sSA, sSA, sSA, sSA }}, |
| 442 | /*fin*/ {{sCL, sFW, sSS, sTW, sFW, sTW, sCL, sCW, sLA, sLI, sTW }}, |
Alexander Frolkin | c6c96c1 | 2013-06-13 08:56:15 +0100 | [diff] [blame] | 443 | /*ack*/ {{sES, sES, sSS, sES, sFW, sTW, sCL, sCW, sCL, sLI, sES }}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | /*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sCL }}, |
| 445 | }; |
| 446 | |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 447 | static void tcp_timeout_change(struct ip_vs_proto_data *pd, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | { |
| 449 | int on = (flags & 1); /* secure_tcp */ |
| 450 | |
| 451 | /* |
| 452 | ** FIXME: change secure_tcp to independent sysctl var |
| 453 | ** or make it per-service or per-app because it is valid |
| 454 | ** for most if not for all of the applications. Something |
| 455 | ** like "capabilities" (flags) for each object. |
| 456 | */ |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 457 | pd->tcp_state_table = (on ? tcp_states_dos : tcp_states); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | } |
| 459 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | static inline int tcp_state_idx(struct tcphdr *th) |
| 461 | { |
| 462 | if (th->rst) |
| 463 | return 3; |
| 464 | if (th->syn) |
| 465 | return 0; |
| 466 | if (th->fin) |
| 467 | return 1; |
| 468 | if (th->ack) |
| 469 | return 2; |
| 470 | return -1; |
| 471 | } |
| 472 | |
| 473 | static inline void |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 474 | set_tcp_state(struct ip_vs_proto_data *pd, struct ip_vs_conn *cp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | int direction, struct tcphdr *th) |
| 476 | { |
| 477 | int state_idx; |
| 478 | int new_state = IP_VS_TCP_S_CLOSE; |
| 479 | int state_off = tcp_state_off[direction]; |
| 480 | |
| 481 | /* |
| 482 | * Update state offset to INPUT_ONLY if necessary |
| 483 | * or delete NO_OUTPUT flag if output packet detected |
| 484 | */ |
| 485 | if (cp->flags & IP_VS_CONN_F_NOOUTPUT) { |
| 486 | if (state_off == TCP_DIR_OUTPUT) |
| 487 | cp->flags &= ~IP_VS_CONN_F_NOOUTPUT; |
| 488 | else |
| 489 | state_off = TCP_DIR_INPUT_ONLY; |
| 490 | } |
| 491 | |
| 492 | if ((state_idx = tcp_state_idx(th)) < 0) { |
| 493 | IP_VS_DBG(8, "tcp_state_idx=%d!!!\n", state_idx); |
| 494 | goto tcp_state_out; |
| 495 | } |
| 496 | |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 497 | new_state = |
| 498 | pd->tcp_state_table[state_off+state_idx].next_state[cp->state]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | |
| 500 | tcp_state_out: |
| 501 | if (new_state != cp->state) { |
| 502 | struct ip_vs_dest *dest = cp->dest; |
| 503 | |
Julius Volz | cfc78c5 | 2008-09-02 15:55:53 +0200 | [diff] [blame] | 504 | IP_VS_DBG_BUF(8, "%s %s [%c%c%c%c] %s:%d->" |
| 505 | "%s:%d state: %s->%s conn->refcnt:%d\n", |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 506 | pd->pp->name, |
Julius Volz | cfc78c5 | 2008-09-02 15:55:53 +0200 | [diff] [blame] | 507 | ((state_off == TCP_DIR_OUTPUT) ? |
| 508 | "output " : "input "), |
| 509 | th->syn ? 'S' : '.', |
| 510 | th->fin ? 'F' : '.', |
| 511 | th->ack ? 'A' : '.', |
| 512 | th->rst ? 'R' : '.', |
| 513 | IP_VS_DBG_ADDR(cp->af, &cp->daddr), |
| 514 | ntohs(cp->dport), |
| 515 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), |
| 516 | ntohs(cp->cport), |
| 517 | tcp_state_name(cp->state), |
| 518 | tcp_state_name(new_state), |
| 519 | atomic_read(&cp->refcnt)); |
| 520 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | if (dest) { |
| 522 | if (!(cp->flags & IP_VS_CONN_F_INACTIVE) && |
| 523 | (new_state != IP_VS_TCP_S_ESTABLISHED)) { |
| 524 | atomic_dec(&dest->activeconns); |
| 525 | atomic_inc(&dest->inactconns); |
| 526 | cp->flags |= IP_VS_CONN_F_INACTIVE; |
| 527 | } else if ((cp->flags & IP_VS_CONN_F_INACTIVE) && |
| 528 | (new_state == IP_VS_TCP_S_ESTABLISHED)) { |
| 529 | atomic_inc(&dest->activeconns); |
| 530 | atomic_dec(&dest->inactconns); |
| 531 | cp->flags &= ~IP_VS_CONN_F_INACTIVE; |
| 532 | } |
| 533 | } |
| 534 | } |
| 535 | |
Hans Schillstrom | 4a85b96 | 2011-01-03 14:44:47 +0100 | [diff] [blame] | 536 | if (likely(pd)) |
| 537 | cp->timeout = pd->timeout_table[cp->state = new_state]; |
| 538 | else /* What to do ? */ |
| 539 | cp->timeout = tcp_timeouts[cp->state = new_state]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | } |
| 541 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | /* |
| 543 | * Handle state transitions |
| 544 | */ |
Simon Horman | 4a516f1 | 2011-09-16 14:11:49 +0900 | [diff] [blame] | 545 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | tcp_state_transition(struct ip_vs_conn *cp, int direction, |
| 547 | const struct sk_buff *skb, |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 548 | struct ip_vs_proto_data *pd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | { |
| 550 | struct tcphdr _tcph, *th; |
| 551 | |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 552 | #ifdef CONFIG_IP_VS_IPV6 |
| 553 | int ihl = cp->af == AF_INET ? ip_hdrlen(skb) : sizeof(struct ipv6hdr); |
| 554 | #else |
| 555 | int ihl = ip_hdrlen(skb); |
| 556 | #endif |
| 557 | |
| 558 | th = skb_header_pointer(skb, ihl, sizeof(_tcph), &_tcph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | if (th == NULL) |
Simon Horman | 4a516f1 | 2011-09-16 14:11:49 +0900 | [diff] [blame] | 560 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | |
Julian Anastasov | ac69269 | 2013-03-22 11:46:54 +0200 | [diff] [blame] | 562 | spin_lock_bh(&cp->lock); |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 563 | set_tcp_state(pd, cp, direction, th); |
Julian Anastasov | ac69269 | 2013-03-22 11:46:54 +0200 | [diff] [blame] | 564 | spin_unlock_bh(&cp->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | } |
| 566 | |
Al Viro | 75e7ce6 | 2006-11-14 21:13:28 -0800 | [diff] [blame] | 567 | static inline __u16 tcp_app_hashkey(__be16 port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | { |
Al Viro | 75e7ce6 | 2006-11-14 21:13:28 -0800 | [diff] [blame] | 569 | return (((__force u16)port >> TCP_APP_TAB_BITS) ^ (__force u16)port) |
| 570 | & TCP_APP_TAB_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | } |
| 572 | |
| 573 | |
Hans Schillstrom | ab8a5e8 | 2011-01-03 14:44:53 +0100 | [diff] [blame] | 574 | static int tcp_register_app(struct net *net, struct ip_vs_app *inc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | { |
| 576 | struct ip_vs_app *i; |
Al Viro | 75e7ce6 | 2006-11-14 21:13:28 -0800 | [diff] [blame] | 577 | __u16 hash; |
| 578 | __be16 port = inc->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | int ret = 0; |
Hans Schillstrom | ab8a5e8 | 2011-01-03 14:44:53 +0100 | [diff] [blame] | 580 | struct netns_ipvs *ipvs = net_ipvs(net); |
| 581 | struct ip_vs_proto_data *pd = ip_vs_proto_data_get(net, IPPROTO_TCP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | |
| 583 | hash = tcp_app_hashkey(port); |
| 584 | |
Hans Schillstrom | 4a85b96 | 2011-01-03 14:44:47 +0100 | [diff] [blame] | 585 | list_for_each_entry(i, &ipvs->tcp_apps[hash], p_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | if (i->port == port) { |
| 587 | ret = -EEXIST; |
| 588 | goto out; |
| 589 | } |
| 590 | } |
Julian Anastasov | 363c97d | 2013-03-21 11:58:07 +0200 | [diff] [blame] | 591 | list_add_rcu(&inc->p_list, &ipvs->tcp_apps[hash]); |
Hans Schillstrom | 9bbac6a | 2011-01-03 14:44:52 +0100 | [diff] [blame] | 592 | atomic_inc(&pd->appcnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | |
| 594 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | return ret; |
| 596 | } |
| 597 | |
| 598 | |
| 599 | static void |
Hans Schillstrom | ab8a5e8 | 2011-01-03 14:44:53 +0100 | [diff] [blame] | 600 | tcp_unregister_app(struct net *net, struct ip_vs_app *inc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | { |
Hans Schillstrom | ab8a5e8 | 2011-01-03 14:44:53 +0100 | [diff] [blame] | 602 | struct ip_vs_proto_data *pd = ip_vs_proto_data_get(net, IPPROTO_TCP); |
Hans Schillstrom | 4a85b96 | 2011-01-03 14:44:47 +0100 | [diff] [blame] | 603 | |
Hans Schillstrom | 9bbac6a | 2011-01-03 14:44:52 +0100 | [diff] [blame] | 604 | atomic_dec(&pd->appcnt); |
Julian Anastasov | 363c97d | 2013-03-21 11:58:07 +0200 | [diff] [blame] | 605 | list_del_rcu(&inc->p_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | } |
| 607 | |
| 608 | |
| 609 | static int |
| 610 | tcp_app_conn_bind(struct ip_vs_conn *cp) |
| 611 | { |
Hans Schillstrom | 6e67e58 | 2011-01-03 14:44:57 +0100 | [diff] [blame] | 612 | struct netns_ipvs *ipvs = net_ipvs(ip_vs_conn_net(cp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | int hash; |
| 614 | struct ip_vs_app *inc; |
| 615 | int result = 0; |
| 616 | |
| 617 | /* Default binding: bind app only for NAT */ |
| 618 | if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) |
| 619 | return 0; |
| 620 | |
| 621 | /* Lookup application incarnations and bind the right one */ |
| 622 | hash = tcp_app_hashkey(cp->vport); |
| 623 | |
Julian Anastasov | 363c97d | 2013-03-21 11:58:07 +0200 | [diff] [blame] | 624 | rcu_read_lock(); |
| 625 | list_for_each_entry_rcu(inc, &ipvs->tcp_apps[hash], p_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | if (inc->port == cp->vport) { |
| 627 | if (unlikely(!ip_vs_app_inc_get(inc))) |
| 628 | break; |
Julian Anastasov | 363c97d | 2013-03-21 11:58:07 +0200 | [diff] [blame] | 629 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 631 | IP_VS_DBG_BUF(9, "%s(): Binding conn %s:%u->" |
Julius Volz | cfc78c5 | 2008-09-02 15:55:53 +0200 | [diff] [blame] | 632 | "%s:%u to app %s on port %u\n", |
| 633 | __func__, |
| 634 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), |
| 635 | ntohs(cp->cport), |
| 636 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), |
| 637 | ntohs(cp->vport), |
| 638 | inc->name, ntohs(inc->port)); |
| 639 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | cp->app = inc; |
| 641 | if (inc->init_conn) |
| 642 | result = inc->init_conn(inc, cp); |
| 643 | goto out; |
| 644 | } |
| 645 | } |
Julian Anastasov | 363c97d | 2013-03-21 11:58:07 +0200 | [diff] [blame] | 646 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | |
| 648 | out: |
| 649 | return result; |
| 650 | } |
| 651 | |
| 652 | |
| 653 | /* |
| 654 | * Set LISTEN timeout. (ip_vs_conn_put will setup timer) |
| 655 | */ |
Hans Schillstrom | 4a85b96 | 2011-01-03 14:44:47 +0100 | [diff] [blame] | 656 | void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | { |
Hans Schillstrom | 4a85b96 | 2011-01-03 14:44:47 +0100 | [diff] [blame] | 658 | struct ip_vs_proto_data *pd = ip_vs_proto_data_get(net, IPPROTO_TCP); |
| 659 | |
Julian Anastasov | ac69269 | 2013-03-22 11:46:54 +0200 | [diff] [blame] | 660 | spin_lock_bh(&cp->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | cp->state = IP_VS_TCP_S_LISTEN; |
Hans Schillstrom | 4a85b96 | 2011-01-03 14:44:47 +0100 | [diff] [blame] | 662 | cp->timeout = (pd ? pd->timeout_table[IP_VS_TCP_S_LISTEN] |
| 663 | : tcp_timeouts[IP_VS_TCP_S_LISTEN]); |
Julian Anastasov | ac69269 | 2013-03-22 11:46:54 +0200 | [diff] [blame] | 664 | spin_unlock_bh(&cp->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | } |
| 666 | |
Hans Schillstrom | 4a85b96 | 2011-01-03 14:44:47 +0100 | [diff] [blame] | 667 | /* --------------------------------------------- |
| 668 | * timeouts is netns related now. |
| 669 | * --------------------------------------------- |
| 670 | */ |
Hans Schillstrom | 582b8e3 | 2012-04-26 09:45:35 +0200 | [diff] [blame] | 671 | static int __ip_vs_tcp_init(struct net *net, struct ip_vs_proto_data *pd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | { |
Hans Schillstrom | 4a85b96 | 2011-01-03 14:44:47 +0100 | [diff] [blame] | 673 | struct netns_ipvs *ipvs = net_ipvs(net); |
| 674 | |
| 675 | ip_vs_init_hash_table(ipvs->tcp_apps, TCP_APP_TAB_SIZE); |
Hans Schillstrom | 4a85b96 | 2011-01-03 14:44:47 +0100 | [diff] [blame] | 676 | pd->timeout_table = ip_vs_create_timeout_table((int *)tcp_timeouts, |
| 677 | sizeof(tcp_timeouts)); |
Hans Schillstrom | 582b8e3 | 2012-04-26 09:45:35 +0200 | [diff] [blame] | 678 | if (!pd->timeout_table) |
| 679 | return -ENOMEM; |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 680 | pd->tcp_state_table = tcp_states; |
Hans Schillstrom | 582b8e3 | 2012-04-26 09:45:35 +0200 | [diff] [blame] | 681 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | } |
| 683 | |
Hans Schillstrom | 4a85b96 | 2011-01-03 14:44:47 +0100 | [diff] [blame] | 684 | static void __ip_vs_tcp_exit(struct net *net, struct ip_vs_proto_data *pd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | { |
Hans Schillstrom | 4a85b96 | 2011-01-03 14:44:47 +0100 | [diff] [blame] | 686 | kfree(pd->timeout_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | } |
| 688 | |
| 689 | |
| 690 | struct ip_vs_protocol ip_vs_protocol_tcp = { |
| 691 | .name = "TCP", |
| 692 | .protocol = IPPROTO_TCP, |
Julian Anastasov | 2ad17de | 2008-04-29 03:21:23 -0700 | [diff] [blame] | 693 | .num_states = IP_VS_TCP_S_LAST, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | .dont_defrag = 0, |
Hans Schillstrom | 4a85b96 | 2011-01-03 14:44:47 +0100 | [diff] [blame] | 695 | .init = NULL, |
| 696 | .exit = NULL, |
| 697 | .init_netns = __ip_vs_tcp_init, |
| 698 | .exit_netns = __ip_vs_tcp_exit, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | .register_app = tcp_register_app, |
| 700 | .unregister_app = tcp_unregister_app, |
| 701 | .conn_schedule = tcp_conn_schedule, |
Simon Horman | 5c0d237 | 2010-08-02 17:12:44 +0200 | [diff] [blame] | 702 | .conn_in_get = ip_vs_conn_in_get_proto, |
| 703 | .conn_out_get = ip_vs_conn_out_get_proto, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | .snat_handler = tcp_snat_handler, |
| 705 | .dnat_handler = tcp_dnat_handler, |
| 706 | .csum_check = tcp_csum_check, |
| 707 | .state_name = tcp_state_name, |
| 708 | .state_transition = tcp_state_transition, |
| 709 | .app_conn_bind = tcp_app_conn_bind, |
| 710 | .debug_packet = ip_vs_tcpudp_debug_packet, |
| 711 | .timeout_change = tcp_timeout_change, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | }; |