Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * IPVS An implementation of the IP virtual server support for the |
| 3 | * LINUX operating system. IPVS is now implemented as a module |
| 4 | * over the Netfilter framework. IPVS can be used to build a |
| 5 | * high-performance and highly available server based on a |
| 6 | * cluster of servers. |
| 7 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> |
| 9 | * Peter Kese <peter.kese@ijs.si> |
| 10 | * Julian Anastasov <ja@ssi.bg> |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License |
| 14 | * as published by the Free Software Foundation; either version |
| 15 | * 2 of the License, or (at your option) any later version. |
| 16 | * |
| 17 | * The IPVS code for kernel 2.2 was done by Wensong Zhang and Peter Kese, |
| 18 | * with changes/fixes from Julian Anastasov, Lars Marowsky-Bree, Horms |
| 19 | * and others. |
| 20 | * |
| 21 | * Changes: |
| 22 | * Paul `Rusty' Russell properly handle non-linear skbs |
Harald Welte | 6869c4d | 2005-08-09 19:24:19 -0700 | [diff] [blame] | 23 | * Harald Welte don't use nfcache |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | * |
| 25 | */ |
| 26 | |
Hannes Eder | 9aada7a | 2009-07-30 14:29:44 -0700 | [diff] [blame] | 27 | #define KMSG_COMPONENT "IPVS" |
| 28 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 29 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/module.h> |
| 31 | #include <linux/kernel.h> |
| 32 | #include <linux/ip.h> |
| 33 | #include <linux/tcp.h> |
Venkata Mohan Reddy | 2906f66 | 2010-02-18 12:31:05 +0100 | [diff] [blame] | 34 | #include <linux/sctp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/icmp.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 36 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | #include <net/ip.h> |
| 39 | #include <net/tcp.h> |
| 40 | #include <net/udp.h> |
| 41 | #include <net/icmp.h> /* for icmp_send */ |
| 42 | #include <net/route.h> |
Stephen Rothwell | 2c70b51 | 2010-08-29 17:04:53 +0000 | [diff] [blame] | 43 | #include <net/ip6_checksum.h> |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 44 | #include <net/netns/generic.h> /* net_generic() */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
| 46 | #include <linux/netfilter.h> |
| 47 | #include <linux/netfilter_ipv4.h> |
| 48 | |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 49 | #ifdef CONFIG_IP_VS_IPV6 |
| 50 | #include <net/ipv6.h> |
| 51 | #include <linux/netfilter_ipv6.h> |
Julian Anastasov | 489fded | 2010-10-17 16:27:31 +0300 | [diff] [blame] | 52 | #include <net/ip6_route.h> |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 53 | #endif |
| 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #include <net/ip_vs.h> |
| 56 | |
| 57 | |
| 58 | EXPORT_SYMBOL(register_ip_vs_scheduler); |
| 59 | EXPORT_SYMBOL(unregister_ip_vs_scheduler); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | EXPORT_SYMBOL(ip_vs_proto_name); |
| 61 | EXPORT_SYMBOL(ip_vs_conn_new); |
| 62 | EXPORT_SYMBOL(ip_vs_conn_in_get); |
| 63 | EXPORT_SYMBOL(ip_vs_conn_out_get); |
| 64 | #ifdef CONFIG_IP_VS_PROTO_TCP |
| 65 | EXPORT_SYMBOL(ip_vs_tcp_conn_listen); |
| 66 | #endif |
| 67 | EXPORT_SYMBOL(ip_vs_conn_put); |
| 68 | #ifdef CONFIG_IP_VS_DEBUG |
| 69 | EXPORT_SYMBOL(ip_vs_get_debug_level); |
| 70 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
Julian Anastasov | b962abd | 2013-03-09 23:25:08 +0200 | [diff] [blame] | 72 | static int ip_vs_net_id __read_mostly; |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 73 | /* netns cnt used for uniqueness */ |
| 74 | static atomic_t ipvs_netns_cnt = ATOMIC_INIT(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
| 76 | /* ID used in ICMP lookups */ |
| 77 | #define icmp_id(icmph) (((icmph)->un).echo.id) |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 78 | #define icmpv6_id(icmph) (icmph->icmp6_dataun.u_echo.identifier) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 80 | const char *ip_vs_proto_name(unsigned int proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | { |
| 82 | static char buf[20]; |
| 83 | |
| 84 | switch (proto) { |
| 85 | case IPPROTO_IP: |
| 86 | return "IP"; |
| 87 | case IPPROTO_UDP: |
| 88 | return "UDP"; |
| 89 | case IPPROTO_TCP: |
| 90 | return "TCP"; |
Venkata Mohan Reddy | 2906f66 | 2010-02-18 12:31:05 +0100 | [diff] [blame] | 91 | case IPPROTO_SCTP: |
| 92 | return "SCTP"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | case IPPROTO_ICMP: |
| 94 | return "ICMP"; |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 95 | #ifdef CONFIG_IP_VS_IPV6 |
| 96 | case IPPROTO_ICMPV6: |
| 97 | return "ICMPv6"; |
| 98 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | default: |
| 100 | sprintf(buf, "IP_%d", proto); |
| 101 | return buf; |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | void ip_vs_init_hash_table(struct list_head *table, int rows) |
| 106 | { |
| 107 | while (--rows >= 0) |
| 108 | INIT_LIST_HEAD(&table[rows]); |
| 109 | } |
| 110 | |
| 111 | static inline void |
| 112 | ip_vs_in_stats(struct ip_vs_conn *cp, struct sk_buff *skb) |
| 113 | { |
| 114 | struct ip_vs_dest *dest = cp->dest; |
Hans Schillstrom | b17fc99 | 2011-01-03 14:44:56 +0100 | [diff] [blame] | 115 | struct netns_ipvs *ipvs = net_ipvs(skb_net(skb)); |
| 116 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) { |
Hans Schillstrom | b17fc99 | 2011-01-03 14:44:56 +0100 | [diff] [blame] | 118 | struct ip_vs_cpu_stats *s; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
Hans Schillstrom | b17fc99 | 2011-01-03 14:44:56 +0100 | [diff] [blame] | 120 | s = this_cpu_ptr(dest->stats.cpustats); |
| 121 | s->ustats.inpkts++; |
| 122 | u64_stats_update_begin(&s->syncp); |
| 123 | s->ustats.inbytes += skb->len; |
| 124 | u64_stats_update_end(&s->syncp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | |
Hans Schillstrom | b17fc99 | 2011-01-03 14:44:56 +0100 | [diff] [blame] | 126 | s = this_cpu_ptr(dest->svc->stats.cpustats); |
| 127 | s->ustats.inpkts++; |
| 128 | u64_stats_update_begin(&s->syncp); |
| 129 | s->ustats.inbytes += skb->len; |
| 130 | u64_stats_update_end(&s->syncp); |
| 131 | |
Julian Anastasov | 2a0751a | 2011-03-04 12:20:35 +0200 | [diff] [blame] | 132 | s = this_cpu_ptr(ipvs->tot_stats.cpustats); |
Hans Schillstrom | b17fc99 | 2011-01-03 14:44:56 +0100 | [diff] [blame] | 133 | s->ustats.inpkts++; |
| 134 | u64_stats_update_begin(&s->syncp); |
| 135 | s->ustats.inbytes += skb->len; |
| 136 | u64_stats_update_end(&s->syncp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | } |
| 138 | } |
| 139 | |
| 140 | |
| 141 | static inline void |
| 142 | ip_vs_out_stats(struct ip_vs_conn *cp, struct sk_buff *skb) |
| 143 | { |
| 144 | struct ip_vs_dest *dest = cp->dest; |
Hans Schillstrom | b17fc99 | 2011-01-03 14:44:56 +0100 | [diff] [blame] | 145 | struct netns_ipvs *ipvs = net_ipvs(skb_net(skb)); |
| 146 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) { |
Hans Schillstrom | b17fc99 | 2011-01-03 14:44:56 +0100 | [diff] [blame] | 148 | struct ip_vs_cpu_stats *s; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
Hans Schillstrom | b17fc99 | 2011-01-03 14:44:56 +0100 | [diff] [blame] | 150 | s = this_cpu_ptr(dest->stats.cpustats); |
| 151 | s->ustats.outpkts++; |
| 152 | u64_stats_update_begin(&s->syncp); |
| 153 | s->ustats.outbytes += skb->len; |
| 154 | u64_stats_update_end(&s->syncp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
Hans Schillstrom | b17fc99 | 2011-01-03 14:44:56 +0100 | [diff] [blame] | 156 | s = this_cpu_ptr(dest->svc->stats.cpustats); |
| 157 | s->ustats.outpkts++; |
| 158 | u64_stats_update_begin(&s->syncp); |
| 159 | s->ustats.outbytes += skb->len; |
| 160 | u64_stats_update_end(&s->syncp); |
| 161 | |
Julian Anastasov | 2a0751a | 2011-03-04 12:20:35 +0200 | [diff] [blame] | 162 | s = this_cpu_ptr(ipvs->tot_stats.cpustats); |
Hans Schillstrom | b17fc99 | 2011-01-03 14:44:56 +0100 | [diff] [blame] | 163 | s->ustats.outpkts++; |
| 164 | u64_stats_update_begin(&s->syncp); |
| 165 | s->ustats.outbytes += skb->len; |
| 166 | u64_stats_update_end(&s->syncp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | } |
| 168 | } |
| 169 | |
| 170 | |
| 171 | static inline void |
| 172 | ip_vs_conn_stats(struct ip_vs_conn *cp, struct ip_vs_service *svc) |
| 173 | { |
Hans Schillstrom | b17fc99 | 2011-01-03 14:44:56 +0100 | [diff] [blame] | 174 | struct netns_ipvs *ipvs = net_ipvs(svc->net); |
| 175 | struct ip_vs_cpu_stats *s; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
Hans Schillstrom | b17fc99 | 2011-01-03 14:44:56 +0100 | [diff] [blame] | 177 | s = this_cpu_ptr(cp->dest->stats.cpustats); |
| 178 | s->ustats.conns++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | |
Hans Schillstrom | b17fc99 | 2011-01-03 14:44:56 +0100 | [diff] [blame] | 180 | s = this_cpu_ptr(svc->stats.cpustats); |
| 181 | s->ustats.conns++; |
| 182 | |
Julian Anastasov | 2a0751a | 2011-03-04 12:20:35 +0200 | [diff] [blame] | 183 | s = this_cpu_ptr(ipvs->tot_stats.cpustats); |
Hans Schillstrom | b17fc99 | 2011-01-03 14:44:56 +0100 | [diff] [blame] | 184 | s->ustats.conns++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | } |
| 186 | |
| 187 | |
Simon Horman | 4a516f1 | 2011-09-16 14:11:49 +0900 | [diff] [blame] | 188 | static inline void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | ip_vs_set_state(struct ip_vs_conn *cp, int direction, |
| 190 | const struct sk_buff *skb, |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 191 | struct ip_vs_proto_data *pd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | { |
Simon Horman | 4a516f1 | 2011-09-16 14:11:49 +0900 | [diff] [blame] | 193 | if (likely(pd->pp->state_transition)) |
| 194 | pd->pp->state_transition(cp, direction, skb, pd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | } |
| 196 | |
Hans Schillstrom | a5959d5 | 2010-11-19 14:25:10 +0100 | [diff] [blame] | 197 | static inline int |
Simon Horman | 8599928 | 2010-08-22 21:37:53 +0900 | [diff] [blame] | 198 | ip_vs_conn_fill_param_persist(const struct ip_vs_service *svc, |
| 199 | struct sk_buff *skb, int protocol, |
| 200 | const union nf_inet_addr *caddr, __be16 cport, |
| 201 | const union nf_inet_addr *vaddr, __be16 vport, |
| 202 | struct ip_vs_conn_param *p) |
| 203 | { |
Hans Schillstrom | 6e67e58 | 2011-01-03 14:44:57 +0100 | [diff] [blame] | 204 | ip_vs_conn_fill_param(svc->net, svc->af, protocol, caddr, cport, vaddr, |
| 205 | vport, p); |
Julian Anastasov | ceec4c3 | 2013-03-22 11:46:53 +0200 | [diff] [blame] | 206 | p->pe = rcu_dereference(svc->pe); |
Simon Horman | 8599928 | 2010-08-22 21:37:53 +0900 | [diff] [blame] | 207 | if (p->pe && p->pe->fill_param) |
Hans Schillstrom | a5959d5 | 2010-11-19 14:25:10 +0100 | [diff] [blame] | 208 | return p->pe->fill_param(p, skb); |
| 209 | |
| 210 | return 0; |
Simon Horman | 8599928 | 2010-08-22 21:37:53 +0900 | [diff] [blame] | 211 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | /* |
| 214 | * IPVS persistent scheduling function |
| 215 | * It creates a connection entry according to its template if exists, |
| 216 | * or selects a server and creates a connection entry plus a template. |
| 217 | * Locking: we are svc user (svc->refcnt), so we hold all dests too |
| 218 | * Protocols supported: TCP, UDP |
| 219 | */ |
| 220 | static struct ip_vs_conn * |
| 221 | ip_vs_sched_persist(struct ip_vs_service *svc, |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 222 | struct sk_buff *skb, __be16 src_port, __be16 dst_port, |
| 223 | int *ignored, struct ip_vs_iphdr *iph) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | { |
| 225 | struct ip_vs_conn *cp = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | struct ip_vs_dest *dest; |
| 227 | struct ip_vs_conn *ct; |
Simon Horman | 5b57a98 | 2010-08-22 21:37:51 +0900 | [diff] [blame] | 228 | __be16 dport = 0; /* destination port to forward */ |
Julian Anastasov | 3575792 | 2010-09-17 14:18:16 +0200 | [diff] [blame] | 229 | unsigned int flags; |
Simon Horman | f11017e | 2010-08-22 21:37:52 +0900 | [diff] [blame] | 230 | struct ip_vs_conn_param param; |
Simon Horman | e0aac52 | 2012-01-27 10:45:27 +0900 | [diff] [blame] | 231 | const union nf_inet_addr fwmark = { .ip = htonl(svc->fwmark) }; |
Julius Volz | 28364a5 | 2008-09-02 15:55:43 +0200 | [diff] [blame] | 232 | union nf_inet_addr snet; /* source network of the client, |
| 233 | after masking */ |
Julius Volz | cd17f9e | 2008-09-02 15:55:46 +0200 | [diff] [blame] | 234 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | /* Mask saddr with the netmask to adjust template granularity */ |
Julius Volz | cd17f9e | 2008-09-02 15:55:46 +0200 | [diff] [blame] | 236 | #ifdef CONFIG_IP_VS_IPV6 |
| 237 | if (svc->af == AF_INET6) |
Julian Anastasov | 0a92586 | 2013-04-17 23:50:49 +0300 | [diff] [blame] | 238 | ipv6_addr_prefix(&snet.in6, &iph->saddr.in6, |
| 239 | (__force __u32) svc->netmask); |
Julius Volz | cd17f9e | 2008-09-02 15:55:46 +0200 | [diff] [blame] | 240 | else |
| 241 | #endif |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 242 | snet.ip = iph->saddr.ip & svc->netmask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | |
Julius Volz | cd17f9e | 2008-09-02 15:55:46 +0200 | [diff] [blame] | 244 | IP_VS_DBG_BUF(6, "p-schedule: src %s:%u dest %s:%u " |
| 245 | "mnet %s\n", |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 246 | IP_VS_DBG_ADDR(svc->af, &iph->saddr), ntohs(src_port), |
| 247 | IP_VS_DBG_ADDR(svc->af, &iph->daddr), ntohs(dst_port), |
Julius Volz | cd17f9e | 2008-09-02 15:55:46 +0200 | [diff] [blame] | 248 | IP_VS_DBG_ADDR(svc->af, &snet)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
| 250 | /* |
| 251 | * As far as we know, FTP is a very complicated network protocol, and |
| 252 | * it uses control connection and data connections. For active FTP, |
| 253 | * FTP server initialize data connection to the client, its source port |
| 254 | * is often 20. For passive FTP, FTP server tells the clients the port |
| 255 | * that it passively listens to, and the client issues the data |
| 256 | * connection. In the tunneling or direct routing mode, the load |
| 257 | * balancer is on the client-to-server half of connection, the port |
| 258 | * number is unknown to the load balancer. So, a conn template like |
| 259 | * <caddr, 0, vaddr, 0, daddr, 0> is created for persistent FTP |
| 260 | * service, and a template like <caddr, 0, vaddr, vport, daddr, dport> |
| 261 | * is created for other persistent services. |
| 262 | */ |
Simon Horman | 5b57a98 | 2010-08-22 21:37:51 +0900 | [diff] [blame] | 263 | { |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 264 | int protocol = iph->protocol; |
| 265 | const union nf_inet_addr *vaddr = &iph->daddr; |
Simon Horman | f11017e | 2010-08-22 21:37:52 +0900 | [diff] [blame] | 266 | __be16 vport = 0; |
| 267 | |
Hans Schillstrom | ce144f2 | 2010-11-19 14:25:08 +0100 | [diff] [blame] | 268 | if (dst_port == svc->port) { |
Simon Horman | 5b57a98 | 2010-08-22 21:37:51 +0900 | [diff] [blame] | 269 | /* non-FTP template: |
| 270 | * <protocol, caddr, 0, vaddr, vport, daddr, dport> |
| 271 | * FTP template: |
| 272 | * <protocol, caddr, 0, vaddr, 0, daddr, 0> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | */ |
| 274 | if (svc->port != FTPPORT) |
Hans Schillstrom | ce144f2 | 2010-11-19 14:25:08 +0100 | [diff] [blame] | 275 | vport = dst_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | } else { |
Simon Horman | 5b57a98 | 2010-08-22 21:37:51 +0900 | [diff] [blame] | 277 | /* Note: persistent fwmark-based services and |
| 278 | * persistent port zero service are handled here. |
| 279 | * fwmark template: |
| 280 | * <IPPROTO_IP,caddr,0,fwmark,0,daddr,0> |
| 281 | * port zero template: |
| 282 | * <protocol,caddr,0,vaddr,0,daddr,0> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | */ |
Julius Volz | 28364a5 | 2008-09-02 15:55:43 +0200 | [diff] [blame] | 284 | if (svc->fwmark) { |
Simon Horman | 5b57a98 | 2010-08-22 21:37:51 +0900 | [diff] [blame] | 285 | protocol = IPPROTO_IP; |
| 286 | vaddr = &fwmark; |
| 287 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | } |
Hans Schillstrom | a5959d5 | 2010-11-19 14:25:10 +0100 | [diff] [blame] | 289 | /* return *ignored = -1 so NF_DROP can be used */ |
| 290 | if (ip_vs_conn_fill_param_persist(svc, skb, protocol, &snet, 0, |
| 291 | vaddr, vport, ¶m) < 0) { |
| 292 | *ignored = -1; |
| 293 | return NULL; |
| 294 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | } |
| 296 | |
Simon Horman | 5b57a98 | 2010-08-22 21:37:51 +0900 | [diff] [blame] | 297 | /* Check if a template already exists */ |
Simon Horman | f11017e | 2010-08-22 21:37:52 +0900 | [diff] [blame] | 298 | ct = ip_vs_ct_in_get(¶m); |
Simon Horman | 5b57a98 | 2010-08-22 21:37:51 +0900 | [diff] [blame] | 299 | if (!ct || !ip_vs_check_template(ct)) { |
Julian Anastasov | ceec4c3 | 2013-03-22 11:46:53 +0200 | [diff] [blame] | 300 | struct ip_vs_scheduler *sched; |
| 301 | |
Hans Schillstrom | a5959d5 | 2010-11-19 14:25:10 +0100 | [diff] [blame] | 302 | /* |
| 303 | * No template found or the dest of the connection |
Simon Horman | 5b57a98 | 2010-08-22 21:37:51 +0900 | [diff] [blame] | 304 | * template is not available. |
Hans Schillstrom | a5959d5 | 2010-11-19 14:25:10 +0100 | [diff] [blame] | 305 | * return *ignored=0 i.e. ICMP and NF_DROP |
Simon Horman | 5b57a98 | 2010-08-22 21:37:51 +0900 | [diff] [blame] | 306 | */ |
Julian Anastasov | ceec4c3 | 2013-03-22 11:46:53 +0200 | [diff] [blame] | 307 | sched = rcu_dereference(svc->scheduler); |
Julian Anastasov | bba54de | 2013-06-16 09:09:36 +0300 | [diff] [blame] | 308 | dest = sched->schedule(svc, skb, iph); |
Simon Horman | 5b57a98 | 2010-08-22 21:37:51 +0900 | [diff] [blame] | 309 | if (!dest) { |
| 310 | IP_VS_DBG(1, "p-schedule: no dest found.\n"); |
Simon Horman | 8599928 | 2010-08-22 21:37:53 +0900 | [diff] [blame] | 311 | kfree(param.pe_data); |
Hans Schillstrom | a5959d5 | 2010-11-19 14:25:10 +0100 | [diff] [blame] | 312 | *ignored = 0; |
Simon Horman | 5b57a98 | 2010-08-22 21:37:51 +0900 | [diff] [blame] | 313 | return NULL; |
| 314 | } |
| 315 | |
Hans Schillstrom | ce144f2 | 2010-11-19 14:25:08 +0100 | [diff] [blame] | 316 | if (dst_port == svc->port && svc->port != FTPPORT) |
Simon Horman | 5b57a98 | 2010-08-22 21:37:51 +0900 | [diff] [blame] | 317 | dport = dest->port; |
| 318 | |
Simon Horman | 8599928 | 2010-08-22 21:37:53 +0900 | [diff] [blame] | 319 | /* Create a template |
| 320 | * This adds param.pe_data to the template, |
| 321 | * and thus param.pe_data will be destroyed |
| 322 | * when the template expires */ |
Simon Horman | f11017e | 2010-08-22 21:37:52 +0900 | [diff] [blame] | 323 | ct = ip_vs_conn_new(¶m, &dest->addr, dport, |
Hans Schillstrom | 0e051e6 | 2010-11-19 14:25:07 +0100 | [diff] [blame] | 324 | IP_VS_CONN_F_TEMPLATE, dest, skb->mark); |
Simon Horman | 8599928 | 2010-08-22 21:37:53 +0900 | [diff] [blame] | 325 | if (ct == NULL) { |
| 326 | kfree(param.pe_data); |
Hans Schillstrom | a5959d5 | 2010-11-19 14:25:10 +0100 | [diff] [blame] | 327 | *ignored = -1; |
Simon Horman | 5b57a98 | 2010-08-22 21:37:51 +0900 | [diff] [blame] | 328 | return NULL; |
Simon Horman | 8599928 | 2010-08-22 21:37:53 +0900 | [diff] [blame] | 329 | } |
Simon Horman | 5b57a98 | 2010-08-22 21:37:51 +0900 | [diff] [blame] | 330 | |
| 331 | ct->timeout = svc->timeout; |
Simon Horman | 8599928 | 2010-08-22 21:37:53 +0900 | [diff] [blame] | 332 | } else { |
Simon Horman | 5b57a98 | 2010-08-22 21:37:51 +0900 | [diff] [blame] | 333 | /* set destination with the found template */ |
| 334 | dest = ct->dest; |
Simon Horman | 8599928 | 2010-08-22 21:37:53 +0900 | [diff] [blame] | 335 | kfree(param.pe_data); |
| 336 | } |
Simon Horman | 5b57a98 | 2010-08-22 21:37:51 +0900 | [diff] [blame] | 337 | |
Hans Schillstrom | ce144f2 | 2010-11-19 14:25:08 +0100 | [diff] [blame] | 338 | dport = dst_port; |
Simon Horman | 5b57a98 | 2010-08-22 21:37:51 +0900 | [diff] [blame] | 339 | if (dport == svc->port && dest->port) |
| 340 | dport = dest->port; |
| 341 | |
Nick Chalk | 26ec037 | 2010-06-22 08:07:01 +0200 | [diff] [blame] | 342 | flags = (svc->flags & IP_VS_SVC_F_ONEPACKET |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 343 | && iph->protocol == IPPROTO_UDP) ? |
Nick Chalk | 26ec037 | 2010-06-22 08:07:01 +0200 | [diff] [blame] | 344 | IP_VS_CONN_F_ONE_PACKET : 0; |
| 345 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | /* |
| 347 | * Create a new connection according to the template |
| 348 | */ |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 349 | ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol, &iph->saddr, |
| 350 | src_port, &iph->daddr, dst_port, ¶m); |
Hans Schillstrom | ce144f2 | 2010-11-19 14:25:08 +0100 | [diff] [blame] | 351 | |
Hans Schillstrom | 0e051e6 | 2010-11-19 14:25:07 +0100 | [diff] [blame] | 352 | cp = ip_vs_conn_new(¶m, &dest->addr, dport, flags, dest, skb->mark); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | if (cp == NULL) { |
| 354 | ip_vs_conn_put(ct); |
Hans Schillstrom | a5959d5 | 2010-11-19 14:25:10 +0100 | [diff] [blame] | 355 | *ignored = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | return NULL; |
| 357 | } |
| 358 | |
| 359 | /* |
| 360 | * Add its control |
| 361 | */ |
| 362 | ip_vs_control_add(cp, ct); |
| 363 | ip_vs_conn_put(ct); |
| 364 | |
| 365 | ip_vs_conn_stats(cp, svc); |
| 366 | return cp; |
| 367 | } |
| 368 | |
| 369 | |
| 370 | /* |
| 371 | * IPVS main scheduling function |
| 372 | * It selects a server according to the virtual service, and |
| 373 | * creates a connection entry. |
| 374 | * Protocols supported: TCP, UDP |
Hans Schillstrom | a5959d5 | 2010-11-19 14:25:10 +0100 | [diff] [blame] | 375 | * |
| 376 | * Usage of *ignored |
| 377 | * |
| 378 | * 1 : protocol tried to schedule (eg. on SYN), found svc but the |
| 379 | * svc/scheduler decides that this packet should be accepted with |
| 380 | * NF_ACCEPT because it must not be scheduled. |
| 381 | * |
| 382 | * 0 : scheduler can not find destination, so try bypass or |
| 383 | * return ICMP and then NF_DROP (ip_vs_leave). |
| 384 | * |
| 385 | * -1 : scheduler tried to schedule but fatal error occurred, eg. |
| 386 | * ip_vs_conn_new failure (ENOMEM) or ip_vs_sip_fill_param |
| 387 | * failure such as missing Call-ID, ENOMEM on skb_linearize |
| 388 | * or pe_data. In this case we should return NF_DROP without |
| 389 | * any attempts to send ICMP with ip_vs_leave. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | */ |
| 391 | struct ip_vs_conn * |
Julian Anastasov | 190ecd2 | 2010-10-17 16:24:37 +0300 | [diff] [blame] | 392 | ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb, |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 393 | struct ip_vs_proto_data *pd, int *ignored, |
| 394 | struct ip_vs_iphdr *iph) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | { |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 396 | struct ip_vs_protocol *pp = pd->pp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | struct ip_vs_conn *cp = NULL; |
Julian Anastasov | ceec4c3 | 2013-03-22 11:46:53 +0200 | [diff] [blame] | 398 | struct ip_vs_scheduler *sched; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | struct ip_vs_dest *dest; |
Julian Anastasov | 3575792 | 2010-09-17 14:18:16 +0200 | [diff] [blame] | 400 | __be16 _ports[2], *pptr; |
| 401 | unsigned int flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | |
Julian Anastasov | 190ecd2 | 2010-10-17 16:24:37 +0300 | [diff] [blame] | 403 | *ignored = 1; |
Jesper Dangaard Brouer | 2f74713 | 2012-09-26 14:06:59 +0200 | [diff] [blame] | 404 | /* |
| 405 | * IPv6 frags, only the first hit here. |
| 406 | */ |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 407 | pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports, iph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | if (pptr == NULL) |
| 409 | return NULL; |
| 410 | |
| 411 | /* |
Julian Anastasov | 190ecd2 | 2010-10-17 16:24:37 +0300 | [diff] [blame] | 412 | * FTPDATA needs this check when using local real server. |
| 413 | * Never schedule Active FTPDATA connections from real server. |
| 414 | * For LVS-NAT they must be already created. For other methods |
| 415 | * with persistence the connection is created on SYN+ACK. |
| 416 | */ |
| 417 | if (pptr[0] == FTPDATA) { |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 418 | IP_VS_DBG_PKT(12, svc->af, pp, skb, 0, |
| 419 | "Not scheduling FTPDATA"); |
Julian Anastasov | 190ecd2 | 2010-10-17 16:24:37 +0300 | [diff] [blame] | 420 | return NULL; |
| 421 | } |
| 422 | |
| 423 | /* |
Hans Schillstrom | a5959d5 | 2010-11-19 14:25:10 +0100 | [diff] [blame] | 424 | * Do not schedule replies from local real server. |
Julian Anastasov | 190ecd2 | 2010-10-17 16:24:37 +0300 | [diff] [blame] | 425 | */ |
| 426 | if ((!skb->dev || skb->dev->flags & IFF_LOOPBACK) && |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 427 | (cp = pp->conn_in_get(svc->af, skb, iph, 1))) { |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 428 | IP_VS_DBG_PKT(12, svc->af, pp, skb, 0, |
Julian Anastasov | 190ecd2 | 2010-10-17 16:24:37 +0300 | [diff] [blame] | 429 | "Not scheduling reply for existing connection"); |
| 430 | __ip_vs_conn_put(cp); |
| 431 | return NULL; |
| 432 | } |
| 433 | |
| 434 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | * Persistent service |
| 436 | */ |
Hans Schillstrom | a5959d5 | 2010-11-19 14:25:10 +0100 | [diff] [blame] | 437 | if (svc->flags & IP_VS_SVC_F_PERSISTENT) |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 438 | return ip_vs_sched_persist(svc, skb, pptr[0], pptr[1], ignored, |
| 439 | iph); |
Hans Schillstrom | a5959d5 | 2010-11-19 14:25:10 +0100 | [diff] [blame] | 440 | |
| 441 | *ignored = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | |
| 443 | /* |
| 444 | * Non-persistent service |
| 445 | */ |
| 446 | if (!svc->fwmark && pptr[1] != svc->port) { |
| 447 | if (!svc->port) |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 448 | pr_err("Schedule: port zero only supported " |
| 449 | "in persistent services, " |
| 450 | "check your ipvs configuration\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | return NULL; |
| 452 | } |
| 453 | |
Julian Anastasov | ceec4c3 | 2013-03-22 11:46:53 +0200 | [diff] [blame] | 454 | sched = rcu_dereference(svc->scheduler); |
Julian Anastasov | bba54de | 2013-06-16 09:09:36 +0300 | [diff] [blame] | 455 | dest = sched->schedule(svc, skb, iph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | if (dest == NULL) { |
| 457 | IP_VS_DBG(1, "Schedule: no dest found.\n"); |
| 458 | return NULL; |
| 459 | } |
| 460 | |
Nick Chalk | 26ec037 | 2010-06-22 08:07:01 +0200 | [diff] [blame] | 461 | flags = (svc->flags & IP_VS_SVC_F_ONEPACKET |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 462 | && iph->protocol == IPPROTO_UDP) ? |
Nick Chalk | 26ec037 | 2010-06-22 08:07:01 +0200 | [diff] [blame] | 463 | IP_VS_CONN_F_ONE_PACKET : 0; |
| 464 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | /* |
| 466 | * Create a connection entry. |
| 467 | */ |
Simon Horman | f11017e | 2010-08-22 21:37:52 +0900 | [diff] [blame] | 468 | { |
| 469 | struct ip_vs_conn_param p; |
Hans Schillstrom | 6e67e58 | 2011-01-03 14:44:57 +0100 | [diff] [blame] | 470 | |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 471 | ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol, |
| 472 | &iph->saddr, pptr[0], &iph->daddr, |
| 473 | pptr[1], &p); |
Simon Horman | f11017e | 2010-08-22 21:37:52 +0900 | [diff] [blame] | 474 | cp = ip_vs_conn_new(&p, &dest->addr, |
| 475 | dest->port ? dest->port : pptr[1], |
Hans Schillstrom | 0e051e6 | 2010-11-19 14:25:07 +0100 | [diff] [blame] | 476 | flags, dest, skb->mark); |
Hans Schillstrom | a5959d5 | 2010-11-19 14:25:10 +0100 | [diff] [blame] | 477 | if (!cp) { |
| 478 | *ignored = -1; |
Simon Horman | f11017e | 2010-08-22 21:37:52 +0900 | [diff] [blame] | 479 | return NULL; |
Hans Schillstrom | a5959d5 | 2010-11-19 14:25:10 +0100 | [diff] [blame] | 480 | } |
Simon Horman | f11017e | 2010-08-22 21:37:52 +0900 | [diff] [blame] | 481 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | |
Julius Volz | cd17f9e | 2008-09-02 15:55:46 +0200 | [diff] [blame] | 483 | IP_VS_DBG_BUF(6, "Schedule fwd:%c c:%s:%u v:%s:%u " |
| 484 | "d:%s:%u conn->flags:%X conn->refcnt:%d\n", |
| 485 | ip_vs_fwd_tag(cp), |
| 486 | IP_VS_DBG_ADDR(svc->af, &cp->caddr), ntohs(cp->cport), |
| 487 | IP_VS_DBG_ADDR(svc->af, &cp->vaddr), ntohs(cp->vport), |
| 488 | IP_VS_DBG_ADDR(svc->af, &cp->daddr), ntohs(cp->dport), |
| 489 | cp->flags, atomic_read(&cp->refcnt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | |
| 491 | ip_vs_conn_stats(cp, svc); |
| 492 | return cp; |
| 493 | } |
| 494 | |
| 495 | |
| 496 | /* |
| 497 | * Pass or drop the packet. |
| 498 | * Called by ip_vs_in, when the virtual service is available but |
| 499 | * no destination is available for a new connection. |
| 500 | */ |
| 501 | int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 502 | struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | { |
Al Viro | 014d730 | 2006-09-28 14:29:52 -0700 | [diff] [blame] | 504 | __be16 _ports[2], *pptr; |
Simon Horman | a7a86b8 | 2011-02-04 18:33:02 +0900 | [diff] [blame] | 505 | #ifdef CONFIG_SYSCTL |
| 506 | struct net *net; |
| 507 | struct netns_ipvs *ipvs; |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 508 | int unicast; |
Simon Horman | a7a86b8 | 2011-02-04 18:33:02 +0900 | [diff] [blame] | 509 | #endif |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 510 | |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 511 | pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports, iph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | if (pptr == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | return NF_DROP; |
| 514 | } |
Simon Horman | a7a86b8 | 2011-02-04 18:33:02 +0900 | [diff] [blame] | 515 | |
| 516 | #ifdef CONFIG_SYSCTL |
Hans Schillstrom | 4a98480 | 2011-01-03 14:45:02 +0100 | [diff] [blame] | 517 | net = skb_net(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 519 | #ifdef CONFIG_IP_VS_IPV6 |
| 520 | if (svc->af == AF_INET6) |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 521 | unicast = ipv6_addr_type(&iph->daddr.in6) & IPV6_ADDR_UNICAST; |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 522 | else |
| 523 | #endif |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 524 | unicast = (inet_addr_type(net, iph->daddr.ip) == RTN_UNICAST); |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 525 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | /* if it is fwmark-based service, the cache_bypass sysctl is up |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 527 | and the destination is a non-local unicast, then create |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | a cache_bypass connection entry */ |
Hans Schillstrom | 4a98480 | 2011-01-03 14:45:02 +0100 | [diff] [blame] | 529 | ipvs = net_ipvs(net); |
Hans Schillstrom | a0840e2 | 2011-01-03 14:44:58 +0100 | [diff] [blame] | 530 | if (ipvs->sysctl_cache_bypass && svc->fwmark && unicast) { |
Krzysztof Wilczynski | ad542ced | 2011-10-18 20:59:49 +0100 | [diff] [blame] | 531 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | struct ip_vs_conn *cp; |
Julian Anastasov | 3575792 | 2010-09-17 14:18:16 +0200 | [diff] [blame] | 533 | unsigned int flags = (svc->flags & IP_VS_SVC_F_ONEPACKET && |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 534 | iph->protocol == IPPROTO_UDP) ? |
Julian Anastasov | 3575792 | 2010-09-17 14:18:16 +0200 | [diff] [blame] | 535 | IP_VS_CONN_F_ONE_PACKET : 0; |
Simon Horman | dff630d | 2008-09-17 10:10:42 +1000 | [diff] [blame] | 536 | union nf_inet_addr daddr = { .all = { 0, 0, 0, 0 } }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | /* create a new connection entry */ |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 539 | IP_VS_DBG(6, "%s(): create a cache_bypass entry\n", __func__); |
Simon Horman | f11017e | 2010-08-22 21:37:52 +0900 | [diff] [blame] | 540 | { |
| 541 | struct ip_vs_conn_param p; |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 542 | ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol, |
| 543 | &iph->saddr, pptr[0], |
| 544 | &iph->daddr, pptr[1], &p); |
Simon Horman | f11017e | 2010-08-22 21:37:52 +0900 | [diff] [blame] | 545 | cp = ip_vs_conn_new(&p, &daddr, 0, |
| 546 | IP_VS_CONN_F_BYPASS | flags, |
Hans Schillstrom | 0e051e6 | 2010-11-19 14:25:07 +0100 | [diff] [blame] | 547 | NULL, skb->mark); |
Simon Horman | f11017e | 2010-08-22 21:37:52 +0900 | [diff] [blame] | 548 | if (!cp) |
| 549 | return NF_DROP; |
| 550 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | |
| 552 | /* statistics */ |
| 553 | ip_vs_in_stats(cp, skb); |
| 554 | |
| 555 | /* set state */ |
Simon Horman | 4a516f1 | 2011-09-16 14:11:49 +0900 | [diff] [blame] | 556 | ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | |
| 558 | /* transmit the first SYN packet */ |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 559 | ret = cp->packet_xmit(skb, cp, pd->pp, iph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | /* do not touch skb anymore */ |
| 561 | |
| 562 | atomic_inc(&cp->in_pkts); |
| 563 | ip_vs_conn_put(cp); |
| 564 | return ret; |
| 565 | } |
Simon Horman | a7a86b8 | 2011-02-04 18:33:02 +0900 | [diff] [blame] | 566 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | |
| 568 | /* |
| 569 | * When the virtual ftp service is presented, packets destined |
| 570 | * for other services on the VIP may get here (except services |
| 571 | * listed in the ipvs table), pass the packets, because it is |
| 572 | * not ipvs job to decide to drop the packets. |
| 573 | */ |
Julian Anastasov | ceec4c3 | 2013-03-22 11:46:53 +0200 | [diff] [blame] | 574 | if ((svc->port == FTPPORT) && (pptr[1] != FTPPORT)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | |
| 577 | /* |
| 578 | * Notify the client that the destination is unreachable, and |
| 579 | * release the socket buffer. |
| 580 | * Since it is in IP layer, the TCP socket is not actually |
| 581 | * created, the TCP RST packet cannot be sent, instead that |
| 582 | * ICMP_PORT_UNREACH is sent here no matter it is TCP/UDP. --WZ |
| 583 | */ |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 584 | #ifdef CONFIG_IP_VS_IPV6 |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 585 | if (svc->af == AF_INET6) { |
| 586 | if (!skb->dev) { |
Simon Horman | 9fd0fa7 | 2013-04-19 10:25:42 +0900 | [diff] [blame] | 587 | struct net *net_ = dev_net(skb_dst(skb)->dev); |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 588 | |
Simon Horman | 9fd0fa7 | 2013-04-19 10:25:42 +0900 | [diff] [blame] | 589 | skb->dev = net_->loopback_dev; |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 590 | } |
Alexey Dobriyan | 3ffe533 | 2010-02-18 08:25:24 +0000 | [diff] [blame] | 591 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 592 | } else |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 593 | #endif |
| 594 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
| 595 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | return NF_DROP; |
| 597 | } |
| 598 | |
Simon Horman | 84b3cee | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 599 | #ifdef CONFIG_SYSCTL |
| 600 | |
| 601 | static int sysctl_snat_reroute(struct sk_buff *skb) |
| 602 | { |
| 603 | struct netns_ipvs *ipvs = net_ipvs(skb_net(skb)); |
| 604 | return ipvs->sysctl_snat_reroute; |
| 605 | } |
| 606 | |
Simon Horman | 0cfa558 | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 607 | static int sysctl_nat_icmp_send(struct net *net) |
| 608 | { |
| 609 | struct netns_ipvs *ipvs = net_ipvs(net); |
| 610 | return ipvs->sysctl_nat_icmp_send; |
| 611 | } |
| 612 | |
Simon Horman | 71a8ab6 | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 613 | static int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs) |
| 614 | { |
| 615 | return ipvs->sysctl_expire_nodest_conn; |
| 616 | } |
| 617 | |
Simon Horman | 84b3cee | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 618 | #else |
| 619 | |
| 620 | static int sysctl_snat_reroute(struct sk_buff *skb) { return 0; } |
Simon Horman | 0cfa558 | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 621 | static int sysctl_nat_icmp_send(struct net *net) { return 0; } |
Simon Horman | 71a8ab6 | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 622 | static int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs) { return 0; } |
Simon Horman | 84b3cee | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 623 | |
| 624 | #endif |
| 625 | |
Al Viro | b1550f2 | 2006-11-14 21:37:50 -0800 | [diff] [blame] | 626 | __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | { |
Al Viro | d3bc23e | 2006-11-14 21:24:49 -0800 | [diff] [blame] | 628 | return csum_fold(skb_checksum(skb, offset, skb->len - offset, 0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | } |
| 630 | |
Julian Anastasov | 1ca5bb5 | 2010-10-17 16:32:29 +0300 | [diff] [blame] | 631 | static inline enum ip_defrag_users ip_vs_defrag_user(unsigned int hooknum) |
| 632 | { |
| 633 | if (NF_INET_LOCAL_IN == hooknum) |
| 634 | return IP_DEFRAG_VS_IN; |
| 635 | if (NF_INET_FORWARD == hooknum) |
| 636 | return IP_DEFRAG_VS_FWD; |
| 637 | return IP_DEFRAG_VS_OUT; |
| 638 | } |
| 639 | |
Herbert Xu | 776c729 | 2007-10-14 00:38:32 -0700 | [diff] [blame] | 640 | static inline int ip_vs_gather_frags(struct sk_buff *skb, u_int32_t user) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | { |
Julian Anastasov | ac69269 | 2013-03-22 11:46:54 +0200 | [diff] [blame] | 642 | int err; |
Herbert Xu | 776c729 | 2007-10-14 00:38:32 -0700 | [diff] [blame] | 643 | |
Julian Anastasov | ac69269 | 2013-03-22 11:46:54 +0200 | [diff] [blame] | 644 | local_bh_disable(); |
| 645 | err = ip_defrag(skb, user); |
| 646 | local_bh_enable(); |
Herbert Xu | 776c729 | 2007-10-14 00:38:32 -0700 | [diff] [blame] | 647 | if (!err) |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 648 | ip_send_check(ip_hdr(skb)); |
Herbert Xu | 776c729 | 2007-10-14 00:38:32 -0700 | [diff] [blame] | 649 | |
| 650 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | } |
| 652 | |
Simon Horman | ba4fd7e | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 653 | static int ip_vs_route_me_harder(int af, struct sk_buff *skb) |
| 654 | { |
Simon Horman | ba4fd7e | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 655 | #ifdef CONFIG_IP_VS_IPV6 |
| 656 | if (af == AF_INET6) { |
Simon Horman | 84b3cee | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 657 | if (sysctl_snat_reroute(skb) && ip6_route_me_harder(skb) != 0) |
Simon Horman | ba4fd7e | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 658 | return 1; |
| 659 | } else |
| 660 | #endif |
Simon Horman | 84b3cee | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 661 | if ((sysctl_snat_reroute(skb) || |
Simon Horman | ba4fd7e | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 662 | skb_rtable(skb)->rt_flags & RTCF_LOCAL) && |
| 663 | ip_route_me_harder(skb, RTN_LOCAL) != 0) |
| 664 | return 1; |
| 665 | |
| 666 | return 0; |
| 667 | } |
| 668 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | /* |
| 670 | * Packet has been made sufficiently writable in caller |
| 671 | * - inout: 1=in->out, 0=out->in |
| 672 | */ |
| 673 | void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, |
| 674 | struct ip_vs_conn *cp, int inout) |
| 675 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 676 | struct iphdr *iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | unsigned int icmp_offset = iph->ihl*4; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 678 | struct icmphdr *icmph = (struct icmphdr *)(skb_network_header(skb) + |
| 679 | icmp_offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | struct iphdr *ciph = (struct iphdr *)(icmph + 1); |
| 681 | |
| 682 | if (inout) { |
Julius Volz | e7ade46 | 2008-09-02 15:55:33 +0200 | [diff] [blame] | 683 | iph->saddr = cp->vaddr.ip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | ip_send_check(iph); |
Julius Volz | e7ade46 | 2008-09-02 15:55:33 +0200 | [diff] [blame] | 685 | ciph->daddr = cp->vaddr.ip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | ip_send_check(ciph); |
| 687 | } else { |
Julius Volz | e7ade46 | 2008-09-02 15:55:33 +0200 | [diff] [blame] | 688 | iph->daddr = cp->daddr.ip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | ip_send_check(iph); |
Julius Volz | e7ade46 | 2008-09-02 15:55:33 +0200 | [diff] [blame] | 690 | ciph->saddr = cp->daddr.ip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | ip_send_check(ciph); |
| 692 | } |
| 693 | |
Venkata Mohan Reddy | 2906f66 | 2010-02-18 12:31:05 +0100 | [diff] [blame] | 694 | /* the TCP/UDP/SCTP port */ |
| 695 | if (IPPROTO_TCP == ciph->protocol || IPPROTO_UDP == ciph->protocol || |
| 696 | IPPROTO_SCTP == ciph->protocol) { |
Al Viro | 014d730 | 2006-09-28 14:29:52 -0700 | [diff] [blame] | 697 | __be16 *ports = (void *)ciph + ciph->ihl*4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | |
| 699 | if (inout) |
| 700 | ports[1] = cp->vport; |
| 701 | else |
| 702 | ports[0] = cp->dport; |
| 703 | } |
| 704 | |
| 705 | /* And finally the ICMP checksum */ |
| 706 | icmph->checksum = 0; |
| 707 | icmph->checksum = ip_vs_checksum_complete(skb, icmp_offset); |
| 708 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 709 | |
| 710 | if (inout) |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 711 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | "Forwarding altered outgoing ICMP"); |
| 713 | else |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 714 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | "Forwarding altered incoming ICMP"); |
| 716 | } |
| 717 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 718 | #ifdef CONFIG_IP_VS_IPV6 |
| 719 | void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, |
| 720 | struct ip_vs_conn *cp, int inout) |
| 721 | { |
| 722 | struct ipv6hdr *iph = ipv6_hdr(skb); |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 723 | unsigned int icmp_offset = 0; |
| 724 | unsigned int offs = 0; /* header offset*/ |
| 725 | int protocol; |
| 726 | struct icmp6hdr *icmph; |
| 727 | struct ipv6hdr *ciph; |
| 728 | unsigned short fragoffs; |
| 729 | |
| 730 | ipv6_find_hdr(skb, &icmp_offset, IPPROTO_ICMPV6, &fragoffs, NULL); |
| 731 | icmph = (struct icmp6hdr *)(skb_network_header(skb) + icmp_offset); |
| 732 | offs = icmp_offset + sizeof(struct icmp6hdr); |
| 733 | ciph = (struct ipv6hdr *)(skb_network_header(skb) + offs); |
| 734 | |
| 735 | protocol = ipv6_find_hdr(skb, &offs, -1, &fragoffs, NULL); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 736 | |
| 737 | if (inout) { |
| 738 | iph->saddr = cp->vaddr.in6; |
| 739 | ciph->daddr = cp->vaddr.in6; |
| 740 | } else { |
| 741 | iph->daddr = cp->daddr.in6; |
| 742 | ciph->saddr = cp->daddr.in6; |
| 743 | } |
| 744 | |
Venkata Mohan Reddy | 2906f66 | 2010-02-18 12:31:05 +0100 | [diff] [blame] | 745 | /* the TCP/UDP/SCTP port */ |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 746 | if (!fragoffs && (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol || |
| 747 | IPPROTO_SCTP == protocol)) { |
| 748 | __be16 *ports = (void *)(skb_network_header(skb) + offs); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 749 | |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 750 | IP_VS_DBG(11, "%s() changed port %d to %d\n", __func__, |
| 751 | ntohs(inout ? ports[1] : ports[0]), |
| 752 | ntohs(inout ? cp->vport : cp->dport)); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 753 | if (inout) |
| 754 | ports[1] = cp->vport; |
| 755 | else |
| 756 | ports[0] = cp->dport; |
| 757 | } |
| 758 | |
| 759 | /* And finally the ICMP checksum */ |
Simon Horman | 8870f84 | 2010-08-26 13:21:26 -0700 | [diff] [blame] | 760 | icmph->icmp6_cksum = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, |
| 761 | skb->len - icmp_offset, |
| 762 | IPPROTO_ICMPV6, 0); |
| 763 | skb->csum_start = skb_network_header(skb) - skb->head + icmp_offset; |
| 764 | skb->csum_offset = offsetof(struct icmp6hdr, icmp6_cksum); |
| 765 | skb->ip_summed = CHECKSUM_PARTIAL; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 766 | |
| 767 | if (inout) |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 768 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, |
| 769 | (void *)ciph - (void *)iph, |
| 770 | "Forwarding altered outgoing ICMPv6"); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 771 | else |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 772 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, |
| 773 | (void *)ciph - (void *)iph, |
| 774 | "Forwarding altered incoming ICMPv6"); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 775 | } |
| 776 | #endif |
| 777 | |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 778 | /* Handle relevant response ICMP messages - forward to the right |
Julian Anastasov | 6cb90db | 2011-02-09 02:26:38 +0200 | [diff] [blame] | 779 | * destination host. |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 780 | */ |
Simon Horman | f2428ed | 2008-09-05 11:17:14 +1000 | [diff] [blame] | 781 | static int handle_response_icmp(int af, struct sk_buff *skb, |
| 782 | union nf_inet_addr *snet, |
| 783 | __u8 protocol, struct ip_vs_conn *cp, |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 784 | struct ip_vs_protocol *pp, |
| 785 | unsigned int offset, unsigned int ihl) |
| 786 | { |
| 787 | unsigned int verdict = NF_DROP; |
| 788 | |
| 789 | if (IP_VS_FWD_METHOD(cp) != 0) { |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 790 | pr_err("shouldn't reach here, because the box is on the " |
| 791 | "half connection in the tun/dr module.\n"); |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 792 | } |
| 793 | |
| 794 | /* Ensure the checksum is correct */ |
| 795 | if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { |
| 796 | /* Failed checksum! */ |
Simon Horman | f2428ed | 2008-09-05 11:17:14 +1000 | [diff] [blame] | 797 | IP_VS_DBG_BUF(1, "Forward ICMP: failed checksum from %s!\n", |
| 798 | IP_VS_DBG_ADDR(af, snet)); |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 799 | goto out; |
| 800 | } |
| 801 | |
Venkata Mohan Reddy | 2906f66 | 2010-02-18 12:31:05 +0100 | [diff] [blame] | 802 | if (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol || |
| 803 | IPPROTO_SCTP == protocol) |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 804 | offset += 2 * sizeof(__u16); |
| 805 | if (!skb_make_writable(skb, offset)) |
| 806 | goto out; |
| 807 | |
Simon Horman | f2428ed | 2008-09-05 11:17:14 +1000 | [diff] [blame] | 808 | #ifdef CONFIG_IP_VS_IPV6 |
| 809 | if (af == AF_INET6) |
| 810 | ip_vs_nat_icmp_v6(skb, pp, cp, 1); |
| 811 | else |
| 812 | #endif |
| 813 | ip_vs_nat_icmp(skb, pp, cp, 1); |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 814 | |
Simon Horman | ba4fd7e | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 815 | if (ip_vs_route_me_harder(af, skb)) |
| 816 | goto out; |
Julian Anastasov | f5a4184 | 2010-10-17 16:35:46 +0300 | [diff] [blame] | 817 | |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 818 | /* do the statistics and put it back */ |
| 819 | ip_vs_out_stats(cp, skb); |
| 820 | |
Julian Anastasov | cf356d6 | 2010-10-17 16:21:07 +0300 | [diff] [blame] | 821 | skb->ipvs_property = 1; |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 822 | if (!(cp->flags & IP_VS_CONN_F_NFCT)) |
Julian Anastasov | cf356d6 | 2010-10-17 16:21:07 +0300 | [diff] [blame] | 823 | ip_vs_notrack(skb); |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 824 | else |
| 825 | ip_vs_update_conntrack(skb, cp, 0); |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 826 | verdict = NF_ACCEPT; |
| 827 | |
| 828 | out: |
| 829 | __ip_vs_conn_put(cp); |
| 830 | |
| 831 | return verdict; |
| 832 | } |
| 833 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | /* |
| 835 | * Handle ICMP messages in the inside-to-outside direction (outgoing). |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 836 | * Find any that might be relevant, check against existing connections. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | * Currently handles error types - unreachable, quench, ttl exceeded. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | */ |
Julian Anastasov | 1ca5bb5 | 2010-10-17 16:32:29 +0300 | [diff] [blame] | 839 | static int ip_vs_out_icmp(struct sk_buff *skb, int *related, |
| 840 | unsigned int hooknum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | struct iphdr *iph; |
| 843 | struct icmphdr _icmph, *ic; |
| 844 | struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 845 | struct ip_vs_iphdr ciph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | struct ip_vs_conn *cp; |
| 847 | struct ip_vs_protocol *pp; |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 848 | unsigned int offset, ihl; |
Simon Horman | f2428ed | 2008-09-05 11:17:14 +1000 | [diff] [blame] | 849 | union nf_inet_addr snet; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | |
| 851 | *related = 1; |
| 852 | |
| 853 | /* reassemble IP fragments */ |
Paul Gortmaker | 56f8a75 | 2011-06-21 20:33:34 -0700 | [diff] [blame] | 854 | if (ip_is_fragment(ip_hdr(skb))) { |
Julian Anastasov | 1ca5bb5 | 2010-10-17 16:32:29 +0300 | [diff] [blame] | 855 | if (ip_vs_gather_frags(skb, ip_vs_defrag_user(hooknum))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | } |
| 858 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 859 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | offset = ihl = iph->ihl * 4; |
| 861 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); |
| 862 | if (ic == NULL) |
| 863 | return NF_DROP; |
| 864 | |
Harvey Harrison | 14d5e83 | 2008-10-31 00:54:29 -0700 | [diff] [blame] | 865 | IP_VS_DBG(12, "Outgoing ICMP (%d,%d) %pI4->%pI4\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | ic->type, ntohs(icmp_id(ic)), |
Harvey Harrison | 14d5e83 | 2008-10-31 00:54:29 -0700 | [diff] [blame] | 867 | &iph->saddr, &iph->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | |
| 869 | /* |
| 870 | * Work through seeing if this is for us. |
| 871 | * These checks are supposed to be in an order that means easy |
| 872 | * things are checked first to speed up processing.... however |
| 873 | * this means that some packets will manage to get a long way |
| 874 | * down this stack and then be rejected, but that's life. |
| 875 | */ |
| 876 | if ((ic->type != ICMP_DEST_UNREACH) && |
| 877 | (ic->type != ICMP_SOURCE_QUENCH) && |
| 878 | (ic->type != ICMP_TIME_EXCEEDED)) { |
| 879 | *related = 0; |
| 880 | return NF_ACCEPT; |
| 881 | } |
| 882 | |
| 883 | /* Now find the contained IP header */ |
| 884 | offset += sizeof(_icmph); |
| 885 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); |
| 886 | if (cih == NULL) |
| 887 | return NF_ACCEPT; /* The packet looks wrong, ignore */ |
| 888 | |
| 889 | pp = ip_vs_proto_get(cih->protocol); |
| 890 | if (!pp) |
| 891 | return NF_ACCEPT; |
| 892 | |
| 893 | /* Is the embedded protocol header present? */ |
YOSHIFUJI Hideaki | 4412ec4 | 2007-03-07 14:19:10 +0900 | [diff] [blame] | 894 | if (unlikely(cih->frag_off & htons(IP_OFFSET) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | pp->dont_defrag)) |
| 896 | return NF_ACCEPT; |
| 897 | |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 898 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset, |
| 899 | "Checking outgoing ICMP for"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 901 | ip_vs_fill_ip4hdr(cih, &ciph); |
| 902 | ciph.len += offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | /* The embedded headers contain source and dest in reverse order */ |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 904 | cp = pp->conn_out_get(AF_INET, skb, &ciph, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | if (!cp) |
| 906 | return NF_ACCEPT; |
| 907 | |
Simon Horman | f2428ed | 2008-09-05 11:17:14 +1000 | [diff] [blame] | 908 | snet.ip = iph->saddr; |
| 909 | return handle_response_icmp(AF_INET, skb, &snet, cih->protocol, cp, |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 910 | pp, ciph.len, ihl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | } |
| 912 | |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 913 | #ifdef CONFIG_IP_VS_IPV6 |
Julian Anastasov | 1ca5bb5 | 2010-10-17 16:32:29 +0300 | [diff] [blame] | 914 | static int ip_vs_out_icmp_v6(struct sk_buff *skb, int *related, |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 915 | unsigned int hooknum, struct ip_vs_iphdr *ipvsh) |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 916 | { |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 917 | struct icmp6hdr _icmph, *ic; |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 918 | struct ipv6hdr _ip6h, *ip6h; /* The ip header contained within ICMP */ |
| 919 | struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */ |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 920 | struct ip_vs_conn *cp; |
| 921 | struct ip_vs_protocol *pp; |
Simon Horman | f2428ed | 2008-09-05 11:17:14 +1000 | [diff] [blame] | 922 | union nf_inet_addr snet; |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 923 | unsigned int writable; |
| 924 | |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 925 | *related = 1; |
Jesper Dangaard Brouer | 2f74713 | 2012-09-26 14:06:59 +0200 | [diff] [blame] | 926 | ic = frag_safe_skb_hp(skb, ipvsh->len, sizeof(_icmph), &_icmph, ipvsh); |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 927 | if (ic == NULL) |
| 928 | return NF_DROP; |
| 929 | |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 930 | /* |
| 931 | * Work through seeing if this is for us. |
| 932 | * These checks are supposed to be in an order that means easy |
| 933 | * things are checked first to speed up processing.... however |
| 934 | * this means that some packets will manage to get a long way |
| 935 | * down this stack and then be rejected, but that's life. |
| 936 | */ |
Jesper Dangaard Brouer | 2fab891 | 2012-09-26 14:06:11 +0200 | [diff] [blame] | 937 | if (ic->icmp6_type & ICMPV6_INFOMSG_MASK) { |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 938 | *related = 0; |
| 939 | return NF_ACCEPT; |
| 940 | } |
Jesper Dangaard Brouer | 2f74713 | 2012-09-26 14:06:59 +0200 | [diff] [blame] | 941 | /* Fragment header that is before ICMP header tells us that: |
| 942 | * it's not an error message since they can't be fragmented. |
| 943 | */ |
David S. Miller | e716503 | 2012-11-30 12:01:30 -0500 | [diff] [blame] | 944 | if (ipvsh->flags & IP6_FH_F_FRAG) |
Jesper Dangaard Brouer | 2f74713 | 2012-09-26 14:06:59 +0200 | [diff] [blame] | 945 | return NF_DROP; |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 946 | |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 947 | IP_VS_DBG(8, "Outgoing ICMPv6 (%d,%d) %pI6c->%pI6c\n", |
| 948 | ic->icmp6_type, ntohs(icmpv6_id(ic)), |
| 949 | &ipvsh->saddr, &ipvsh->daddr); |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 950 | |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 951 | /* Now find the contained IP header */ |
| 952 | ciph.len = ipvsh->len + sizeof(_icmph); |
| 953 | ip6h = skb_header_pointer(skb, ciph.len, sizeof(_ip6h), &_ip6h); |
| 954 | if (ip6h == NULL) |
| 955 | return NF_ACCEPT; /* The packet looks wrong, ignore */ |
| 956 | ciph.saddr.in6 = ip6h->saddr; /* conn_out_get() handles reverse order */ |
| 957 | ciph.daddr.in6 = ip6h->daddr; |
| 958 | /* skip possible IPv6 exthdrs of contained IPv6 packet */ |
| 959 | ciph.protocol = ipv6_find_hdr(skb, &ciph.len, -1, &ciph.fragoffs, NULL); |
| 960 | if (ciph.protocol < 0) |
| 961 | return NF_ACCEPT; /* Contained IPv6 hdr looks wrong, ignore */ |
| 962 | |
| 963 | pp = ip_vs_proto_get(ciph.protocol); |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 964 | if (!pp) |
| 965 | return NF_ACCEPT; |
| 966 | |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 967 | /* The embedded headers contain source and dest in reverse order */ |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 968 | cp = pp->conn_out_get(AF_INET6, skb, &ciph, 1); |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 969 | if (!cp) |
| 970 | return NF_ACCEPT; |
| 971 | |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 972 | snet.in6 = ciph.saddr.in6; |
| 973 | writable = ciph.len; |
| 974 | return handle_response_icmp(AF_INET6, skb, &snet, ciph.protocol, cp, |
| 975 | pp, writable, sizeof(struct ipv6hdr)); |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 976 | } |
| 977 | #endif |
| 978 | |
Venkata Mohan Reddy | 2906f66 | 2010-02-18 12:31:05 +0100 | [diff] [blame] | 979 | /* |
| 980 | * Check if sctp chunc is ABORT chunk |
| 981 | */ |
| 982 | static inline int is_sctp_abort(const struct sk_buff *skb, int nh_len) |
| 983 | { |
| 984 | sctp_chunkhdr_t *sch, schunk; |
| 985 | sch = skb_header_pointer(skb, nh_len + sizeof(sctp_sctphdr_t), |
| 986 | sizeof(schunk), &schunk); |
| 987 | if (sch == NULL) |
| 988 | return 0; |
| 989 | if (sch->type == SCTP_CID_ABORT) |
| 990 | return 1; |
| 991 | return 0; |
| 992 | } |
| 993 | |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 994 | static inline int is_tcp_reset(const struct sk_buff *skb, int nh_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | { |
| 996 | struct tcphdr _tcph, *th; |
| 997 | |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 998 | th = skb_header_pointer(skb, nh_len, sizeof(_tcph), &_tcph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | if (th == NULL) |
| 1000 | return 0; |
| 1001 | return th->rst; |
| 1002 | } |
| 1003 | |
Grzegorz Lyczba | dc7b3eb | 2013-05-13 23:56:24 +0200 | [diff] [blame] | 1004 | static inline bool is_new_conn(const struct sk_buff *skb, |
| 1005 | struct ip_vs_iphdr *iph) |
| 1006 | { |
| 1007 | switch (iph->protocol) { |
| 1008 | case IPPROTO_TCP: { |
| 1009 | struct tcphdr _tcph, *th; |
| 1010 | |
| 1011 | th = skb_header_pointer(skb, iph->len, sizeof(_tcph), &_tcph); |
| 1012 | if (th == NULL) |
| 1013 | return false; |
| 1014 | return th->syn; |
| 1015 | } |
| 1016 | case IPPROTO_SCTP: { |
| 1017 | sctp_chunkhdr_t *sch, schunk; |
| 1018 | |
| 1019 | sch = skb_header_pointer(skb, iph->len + sizeof(sctp_sctphdr_t), |
| 1020 | sizeof(schunk), &schunk); |
| 1021 | if (sch == NULL) |
| 1022 | return false; |
| 1023 | return sch->type == SCTP_CID_INIT; |
| 1024 | } |
| 1025 | default: |
| 1026 | return false; |
| 1027 | } |
| 1028 | } |
| 1029 | |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 1030 | /* Handle response packets: rewrite addresses and send away... |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 1031 | */ |
| 1032 | static unsigned int |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 1033 | handle_response(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] | 1034 | struct ip_vs_conn *cp, struct ip_vs_iphdr *iph) |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 1035 | { |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 1036 | struct ip_vs_protocol *pp = pd->pp; |
| 1037 | |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 1038 | IP_VS_DBG_PKT(11, af, pp, skb, 0, "Outgoing packet"); |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 1039 | |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 1040 | if (!skb_make_writable(skb, iph->len)) |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 1041 | goto drop; |
| 1042 | |
| 1043 | /* mangle the packet */ |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 1044 | if (pp->snat_handler && !pp->snat_handler(skb, pp, cp, iph)) |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 1045 | goto drop; |
| 1046 | |
| 1047 | #ifdef CONFIG_IP_VS_IPV6 |
| 1048 | if (af == AF_INET6) |
| 1049 | ipv6_hdr(skb)->saddr = cp->vaddr.in6; |
| 1050 | else |
| 1051 | #endif |
| 1052 | { |
| 1053 | ip_hdr(skb)->saddr = cp->vaddr.ip; |
| 1054 | ip_send_check(ip_hdr(skb)); |
| 1055 | } |
| 1056 | |
Julian Anastasov | 8a80304 | 2010-09-21 17:38:57 +0200 | [diff] [blame] | 1057 | /* |
| 1058 | * nf_iterate does not expect change in the skb->dst->dev. |
| 1059 | * It looks like it is not fatal to enable this code for hooks |
| 1060 | * where our handlers are at the end of the chain list and |
| 1061 | * when all next handlers use skb->dst->dev and not outdev. |
| 1062 | * It will definitely route properly the inout NAT traffic |
| 1063 | * when multiple paths are used. |
| 1064 | */ |
| 1065 | |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 1066 | /* For policy routing, packets originating from this |
| 1067 | * machine itself may be routed differently to packets |
| 1068 | * passing through. We want this packet to be routed as |
| 1069 | * if it came from this machine itself. So re-compute |
| 1070 | * the routing information. |
| 1071 | */ |
Simon Horman | ba4fd7e | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 1072 | if (ip_vs_route_me_harder(af, skb)) |
| 1073 | goto drop; |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 1074 | |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 1075 | IP_VS_DBG_PKT(10, af, pp, skb, 0, "After SNAT"); |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 1076 | |
| 1077 | ip_vs_out_stats(cp, skb); |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 1078 | ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pd); |
Julian Anastasov | cf356d6 | 2010-10-17 16:21:07 +0300 | [diff] [blame] | 1079 | skb->ipvs_property = 1; |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 1080 | if (!(cp->flags & IP_VS_CONN_F_NFCT)) |
Julian Anastasov | cf356d6 | 2010-10-17 16:21:07 +0300 | [diff] [blame] | 1081 | ip_vs_notrack(skb); |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 1082 | else |
| 1083 | ip_vs_update_conntrack(skb, cp, 0); |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 1084 | ip_vs_conn_put(cp); |
| 1085 | |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 1086 | LeaveFunction(11); |
| 1087 | return NF_ACCEPT; |
| 1088 | |
| 1089 | drop: |
| 1090 | ip_vs_conn_put(cp); |
| 1091 | kfree_skb(skb); |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 1092 | LeaveFunction(11); |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 1093 | return NF_STOLEN; |
| 1094 | } |
| 1095 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | /* |
Malcolm Turnbull | 4856c84 | 2008-09-05 11:17:13 +1000 | [diff] [blame] | 1097 | * Check if outgoing packet belongs to the established ip_vs_conn. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | */ |
| 1099 | static unsigned int |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1100 | ip_vs_out(unsigned int hooknum, struct sk_buff *skb, int af) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | { |
Hans Schillstrom | fc72325 | 2011-01-03 14:44:43 +0100 | [diff] [blame] | 1102 | struct net *net = NULL; |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 1103 | struct ip_vs_iphdr iph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | struct ip_vs_protocol *pp; |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 1105 | struct ip_vs_proto_data *pd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | struct ip_vs_conn *cp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1107 | |
| 1108 | EnterFunction(11); |
| 1109 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1110 | /* Already marked as IPVS request or reply? */ |
Harald Welte | 6869c4d | 2005-08-09 19:24:19 -0700 | [diff] [blame] | 1111 | if (skb->ipvs_property) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | return NF_ACCEPT; |
| 1113 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1114 | /* Bad... Do not break raw sockets */ |
| 1115 | if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT && |
| 1116 | af == AF_INET)) { |
| 1117 | struct sock *sk = skb->sk; |
| 1118 | struct inet_sock *inet = inet_sk(skb->sk); |
| 1119 | |
| 1120 | if (inet && sk->sk_family == PF_INET && inet->nodefrag) |
| 1121 | return NF_ACCEPT; |
| 1122 | } |
| 1123 | |
| 1124 | if (unlikely(!skb_dst(skb))) |
| 1125 | return NF_ACCEPT; |
| 1126 | |
Hans Schillstrom | fc72325 | 2011-01-03 14:44:43 +0100 | [diff] [blame] | 1127 | net = skb_net(skb); |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 1128 | if (!net_ipvs(net)->enable) |
| 1129 | return NF_ACCEPT; |
| 1130 | |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 1131 | ip_vs_fill_iph_skb(af, skb, &iph); |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1132 | #ifdef CONFIG_IP_VS_IPV6 |
| 1133 | if (af == AF_INET6) { |
Jesper Dangaard Brouer | 2f74713 | 2012-09-26 14:06:59 +0200 | [diff] [blame] | 1134 | if (!iph.fragoffs && skb_nfct_reasm(skb)) { |
| 1135 | struct sk_buff *reasm = skb_nfct_reasm(skb); |
| 1136 | /* Save fw mark for coming frags */ |
| 1137 | reasm->ipvs_property = 1; |
| 1138 | reasm->mark = skb->mark; |
| 1139 | } |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1140 | if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { |
Julian Anastasov | 1ca5bb5 | 2010-10-17 16:32:29 +0300 | [diff] [blame] | 1141 | int related; |
| 1142 | int verdict = ip_vs_out_icmp_v6(skb, &related, |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 1143 | hooknum, &iph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | |
Julian Anastasov | f5a4184 | 2010-10-17 16:35:46 +0300 | [diff] [blame] | 1145 | if (related) |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1146 | return verdict; |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1147 | } |
| 1148 | } else |
| 1149 | #endif |
| 1150 | if (unlikely(iph.protocol == IPPROTO_ICMP)) { |
Julian Anastasov | 1ca5bb5 | 2010-10-17 16:32:29 +0300 | [diff] [blame] | 1151 | int related; |
| 1152 | int verdict = ip_vs_out_icmp(skb, &related, hooknum); |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1153 | |
Julian Anastasov | f5a4184 | 2010-10-17 16:35:46 +0300 | [diff] [blame] | 1154 | if (related) |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1155 | return verdict; |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1156 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 1158 | pd = ip_vs_proto_data_get(net, iph.protocol); |
| 1159 | if (unlikely(!pd)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | return NF_ACCEPT; |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 1161 | pp = pd->pp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | |
| 1163 | /* reassemble IP fragments */ |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1164 | #ifdef CONFIG_IP_VS_IPV6 |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 1165 | if (af == AF_INET) |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1166 | #endif |
Paul Gortmaker | 56f8a75 | 2011-06-21 20:33:34 -0700 | [diff] [blame] | 1167 | if (unlikely(ip_is_fragment(ip_hdr(skb)) && !pp->dont_defrag)) { |
Julian Anastasov | 1ca5bb5 | 2010-10-17 16:32:29 +0300 | [diff] [blame] | 1168 | if (ip_vs_gather_frags(skb, |
| 1169 | ip_vs_defrag_user(hooknum))) |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1170 | return NF_STOLEN; |
| 1171 | |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 1172 | ip_vs_fill_ip4hdr(skb_network_header(skb), &iph); |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1173 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | |
| 1175 | /* |
| 1176 | * Check if the packet belongs to an existing entry |
| 1177 | */ |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 1178 | cp = pp->conn_out_get(af, skb, &iph, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1180 | if (likely(cp)) |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 1181 | return handle_response(af, skb, pd, cp, &iph); |
Simon Horman | 0cfa558 | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 1182 | if (sysctl_nat_icmp_send(net) && |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1183 | (pp->protocol == IPPROTO_TCP || |
| 1184 | pp->protocol == IPPROTO_UDP || |
| 1185 | pp->protocol == IPPROTO_SCTP)) { |
| 1186 | __be16 _ports[2], *pptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | |
Jesper Dangaard Brouer | 2f74713 | 2012-09-26 14:06:59 +0200 | [diff] [blame] | 1188 | pptr = frag_safe_skb_hp(skb, iph.len, |
| 1189 | sizeof(_ports), _ports, &iph); |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1190 | if (pptr == NULL) |
| 1191 | return NF_ACCEPT; /* Not for me */ |
Julian Anastasov | 276472e | 2013-03-21 11:58:08 +0200 | [diff] [blame] | 1192 | if (ip_vs_has_real_service(net, af, iph.protocol, &iph.saddr, |
| 1193 | pptr[0])) { |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1194 | /* |
| 1195 | * Notify the real server: there is no |
| 1196 | * existing entry if it is not RST |
| 1197 | * packet or not TCP packet. |
| 1198 | */ |
| 1199 | if ((iph.protocol != IPPROTO_TCP && |
| 1200 | iph.protocol != IPPROTO_SCTP) |
| 1201 | || ((iph.protocol == IPPROTO_TCP |
| 1202 | && !is_tcp_reset(skb, iph.len)) |
| 1203 | || (iph.protocol == IPPROTO_SCTP |
| 1204 | && !is_sctp_abort(skb, |
| 1205 | iph.len)))) { |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1206 | #ifdef CONFIG_IP_VS_IPV6 |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1207 | if (af == AF_INET6) { |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1208 | if (!skb->dev) |
| 1209 | skb->dev = net->loopback_dev; |
| 1210 | icmpv6_send(skb, |
| 1211 | ICMPV6_DEST_UNREACH, |
| 1212 | ICMPV6_PORT_UNREACH, |
| 1213 | 0); |
| 1214 | } else |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1215 | #endif |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1216 | icmp_send(skb, |
| 1217 | ICMP_DEST_UNREACH, |
| 1218 | ICMP_PORT_UNREACH, 0); |
| 1219 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | } |
| 1221 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | } |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 1223 | IP_VS_DBG_PKT(12, af, pp, skb, 0, |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1224 | "ip_vs_out: packet continues traversal as normal"); |
| 1225 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | } |
| 1227 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1228 | /* |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1229 | * It is hooked at the NF_INET_FORWARD and NF_INET_LOCAL_IN chain, |
| 1230 | * used only for VS/NAT. |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1231 | * Check if packet is reply for established ip_vs_conn. |
| 1232 | */ |
| 1233 | static unsigned int |
| 1234 | ip_vs_reply4(unsigned int hooknum, struct sk_buff *skb, |
| 1235 | const struct net_device *in, const struct net_device *out, |
| 1236 | int (*okfn)(struct sk_buff *)) |
| 1237 | { |
| 1238 | return ip_vs_out(hooknum, skb, AF_INET); |
| 1239 | } |
| 1240 | |
| 1241 | /* |
| 1242 | * It is hooked at the NF_INET_LOCAL_OUT chain, used only for VS/NAT. |
| 1243 | * Check if packet is reply for established ip_vs_conn. |
| 1244 | */ |
| 1245 | static unsigned int |
| 1246 | ip_vs_local_reply4(unsigned int hooknum, struct sk_buff *skb, |
| 1247 | const struct net_device *in, const struct net_device *out, |
| 1248 | int (*okfn)(struct sk_buff *)) |
| 1249 | { |
Julian Anastasov | ac69269 | 2013-03-22 11:46:54 +0200 | [diff] [blame] | 1250 | return ip_vs_out(hooknum, skb, AF_INET); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1251 | } |
| 1252 | |
| 1253 | #ifdef CONFIG_IP_VS_IPV6 |
| 1254 | |
| 1255 | /* |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1256 | * It is hooked at the NF_INET_FORWARD and NF_INET_LOCAL_IN chain, |
| 1257 | * used only for VS/NAT. |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1258 | * Check if packet is reply for established ip_vs_conn. |
| 1259 | */ |
| 1260 | static unsigned int |
| 1261 | ip_vs_reply6(unsigned int hooknum, struct sk_buff *skb, |
| 1262 | const struct net_device *in, const struct net_device *out, |
| 1263 | int (*okfn)(struct sk_buff *)) |
| 1264 | { |
| 1265 | return ip_vs_out(hooknum, skb, AF_INET6); |
| 1266 | } |
| 1267 | |
| 1268 | /* |
| 1269 | * It is hooked at the NF_INET_LOCAL_OUT chain, used only for VS/NAT. |
| 1270 | * Check if packet is reply for established ip_vs_conn. |
| 1271 | */ |
| 1272 | static unsigned int |
| 1273 | ip_vs_local_reply6(unsigned int hooknum, struct sk_buff *skb, |
| 1274 | const struct net_device *in, const struct net_device *out, |
| 1275 | int (*okfn)(struct sk_buff *)) |
| 1276 | { |
Julian Anastasov | ac69269 | 2013-03-22 11:46:54 +0200 | [diff] [blame] | 1277 | return ip_vs_out(hooknum, skb, AF_INET6); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1278 | } |
| 1279 | |
| 1280 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1281 | |
| 1282 | /* |
| 1283 | * Handle ICMP messages in the outside-to-inside direction (incoming). |
| 1284 | * Find any that might be relevant, check against existing connections, |
| 1285 | * forward to the right destination host if relevant. |
| 1286 | * Currently handles error types - unreachable, quench, ttl exceeded. |
| 1287 | */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1288 | static int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1289 | ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned int hooknum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | { |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 1291 | struct net *net = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | struct iphdr *iph; |
| 1293 | struct icmphdr _icmph, *ic; |
| 1294 | struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 1295 | struct ip_vs_iphdr ciph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | struct ip_vs_conn *cp; |
| 1297 | struct ip_vs_protocol *pp; |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 1298 | struct ip_vs_proto_data *pd; |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 1299 | unsigned int offset, offset2, ihl, verdict; |
| 1300 | bool ipip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1301 | |
| 1302 | *related = 1; |
| 1303 | |
| 1304 | /* reassemble IP fragments */ |
Paul Gortmaker | 56f8a75 | 2011-06-21 20:33:34 -0700 | [diff] [blame] | 1305 | if (ip_is_fragment(ip_hdr(skb))) { |
Julian Anastasov | 1ca5bb5 | 2010-10-17 16:32:29 +0300 | [diff] [blame] | 1306 | if (ip_vs_gather_frags(skb, ip_vs_defrag_user(hooknum))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | } |
| 1309 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1310 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | offset = ihl = iph->ihl * 4; |
| 1312 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); |
| 1313 | if (ic == NULL) |
| 1314 | return NF_DROP; |
| 1315 | |
Harvey Harrison | 14d5e83 | 2008-10-31 00:54:29 -0700 | [diff] [blame] | 1316 | IP_VS_DBG(12, "Incoming ICMP (%d,%d) %pI4->%pI4\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | ic->type, ntohs(icmp_id(ic)), |
Harvey Harrison | 14d5e83 | 2008-10-31 00:54:29 -0700 | [diff] [blame] | 1318 | &iph->saddr, &iph->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | |
| 1320 | /* |
| 1321 | * Work through seeing if this is for us. |
| 1322 | * These checks are supposed to be in an order that means easy |
| 1323 | * things are checked first to speed up processing.... however |
| 1324 | * this means that some packets will manage to get a long way |
| 1325 | * down this stack and then be rejected, but that's life. |
| 1326 | */ |
| 1327 | if ((ic->type != ICMP_DEST_UNREACH) && |
| 1328 | (ic->type != ICMP_SOURCE_QUENCH) && |
| 1329 | (ic->type != ICMP_TIME_EXCEEDED)) { |
| 1330 | *related = 0; |
| 1331 | return NF_ACCEPT; |
| 1332 | } |
| 1333 | |
| 1334 | /* Now find the contained IP header */ |
| 1335 | offset += sizeof(_icmph); |
| 1336 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); |
| 1337 | if (cih == NULL) |
| 1338 | return NF_ACCEPT; /* The packet looks wrong, ignore */ |
| 1339 | |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 1340 | net = skb_net(skb); |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 1341 | |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 1342 | /* Special case for errors for IPIP packets */ |
| 1343 | ipip = false; |
| 1344 | if (cih->protocol == IPPROTO_IPIP) { |
| 1345 | if (unlikely(cih->frag_off & htons(IP_OFFSET))) |
| 1346 | return NF_ACCEPT; |
| 1347 | /* Error for our IPIP must arrive at LOCAL_IN */ |
| 1348 | if (!(skb_rtable(skb)->rt_flags & RTCF_LOCAL)) |
| 1349 | return NF_ACCEPT; |
| 1350 | offset += cih->ihl * 4; |
| 1351 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); |
| 1352 | if (cih == NULL) |
| 1353 | return NF_ACCEPT; /* The packet looks wrong, ignore */ |
| 1354 | ipip = true; |
| 1355 | } |
| 1356 | |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 1357 | pd = ip_vs_proto_data_get(net, cih->protocol); |
| 1358 | if (!pd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | return NF_ACCEPT; |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 1360 | pp = pd->pp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | |
| 1362 | /* Is the embedded protocol header present? */ |
YOSHIFUJI Hideaki | 4412ec4 | 2007-03-07 14:19:10 +0900 | [diff] [blame] | 1363 | if (unlikely(cih->frag_off & htons(IP_OFFSET) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | pp->dont_defrag)) |
| 1365 | return NF_ACCEPT; |
| 1366 | |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 1367 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset, |
| 1368 | "Checking incoming ICMP for"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 1370 | offset2 = offset; |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 1371 | ip_vs_fill_ip4hdr(cih, &ciph); |
| 1372 | ciph.len += offset; |
| 1373 | offset = ciph.len; |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 1374 | /* The embedded headers contain source and dest in reverse order. |
| 1375 | * For IPIP this is error for request, not for reply. |
| 1376 | */ |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 1377 | cp = pp->conn_in_get(AF_INET, skb, &ciph, ipip ? 0 : 1); |
Julian Anastasov | 6cb90db | 2011-02-09 02:26:38 +0200 | [diff] [blame] | 1378 | if (!cp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | return NF_ACCEPT; |
| 1380 | |
| 1381 | verdict = NF_DROP; |
| 1382 | |
| 1383 | /* Ensure the checksum is correct */ |
Herbert Xu | 6047637 | 2007-04-09 11:59:39 -0700 | [diff] [blame] | 1384 | if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1385 | /* Failed checksum! */ |
Harvey Harrison | 14d5e83 | 2008-10-31 00:54:29 -0700 | [diff] [blame] | 1386 | IP_VS_DBG(1, "Incoming ICMP: failed checksum from %pI4!\n", |
| 1387 | &iph->saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | goto out; |
| 1389 | } |
| 1390 | |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 1391 | if (ipip) { |
| 1392 | __be32 info = ic->un.gateway; |
| 1393 | |
| 1394 | /* Update the MTU */ |
| 1395 | if (ic->type == ICMP_DEST_UNREACH && |
| 1396 | ic->code == ICMP_FRAG_NEEDED) { |
| 1397 | struct ip_vs_dest *dest = cp->dest; |
| 1398 | u32 mtu = ntohs(ic->un.frag.mtu); |
| 1399 | |
| 1400 | /* Strip outer IP and ICMP, go to IPIP header */ |
| 1401 | __skb_pull(skb, ihl + sizeof(_icmph)); |
| 1402 | offset2 -= ihl + sizeof(_icmph); |
| 1403 | skb_reset_network_header(skb); |
| 1404 | IP_VS_DBG(12, "ICMP for IPIP %pI4->%pI4: mtu=%u\n", |
| 1405 | &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, mtu); |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 1406 | ipv4_update_pmtu(skb, dev_net(skb->dev), |
| 1407 | mtu, 0, 0, 0, 0); |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 1408 | /* Client uses PMTUD? */ |
| 1409 | if (!(cih->frag_off & htons(IP_DF))) |
| 1410 | goto ignore_ipip; |
| 1411 | /* Prefer the resulting PMTU */ |
| 1412 | if (dest) { |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 1413 | struct ip_vs_dest_dst *dest_dst; |
| 1414 | |
| 1415 | rcu_read_lock(); |
| 1416 | dest_dst = rcu_dereference(dest->dest_dst); |
| 1417 | if (dest_dst) |
| 1418 | mtu = dst_mtu(dest_dst->dst_cache); |
| 1419 | rcu_read_unlock(); |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 1420 | } |
| 1421 | if (mtu > 68 + sizeof(struct iphdr)) |
| 1422 | mtu -= sizeof(struct iphdr); |
| 1423 | info = htonl(mtu); |
| 1424 | } |
| 1425 | /* Strip outer IP, ICMP and IPIP, go to IP header of |
| 1426 | * original request. |
| 1427 | */ |
| 1428 | __skb_pull(skb, offset2); |
| 1429 | skb_reset_network_header(skb); |
| 1430 | IP_VS_DBG(12, "Sending ICMP for %pI4->%pI4: t=%u, c=%u, i=%u\n", |
| 1431 | &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, |
| 1432 | ic->type, ic->code, ntohl(info)); |
| 1433 | icmp_send(skb, ic->type, ic->code, info); |
| 1434 | /* ICMP can be shorter but anyways, account it */ |
| 1435 | ip_vs_out_stats(cp, skb); |
| 1436 | |
| 1437 | ignore_ipip: |
| 1438 | consume_skb(skb); |
| 1439 | verdict = NF_STOLEN; |
| 1440 | goto out; |
| 1441 | } |
| 1442 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | /* do the statistics and put it back */ |
| 1444 | ip_vs_in_stats(cp, skb); |
Julian Anastasov | 06f3d7f | 2013-06-18 10:08:06 +0300 | [diff] [blame] | 1445 | if (IPPROTO_TCP == cih->protocol || IPPROTO_UDP == cih->protocol || |
| 1446 | IPPROTO_SCTP == cih->protocol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | offset += 2 * sizeof(__u16); |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 1448 | verdict = ip_vs_icmp_xmit(skb, cp, pp, offset, hooknum, &ciph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | |
Hans Schillstrom | 552ad65 | 2011-06-13 12:19:26 +0200 | [diff] [blame] | 1450 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | __ip_vs_conn_put(cp); |
| 1452 | |
| 1453 | return verdict; |
| 1454 | } |
| 1455 | |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1456 | #ifdef CONFIG_IP_VS_IPV6 |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 1457 | static int ip_vs_in_icmp_v6(struct sk_buff *skb, int *related, |
| 1458 | unsigned int hooknum, struct ip_vs_iphdr *iph) |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1459 | { |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 1460 | struct net *net = NULL; |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 1461 | struct ipv6hdr _ip6h, *ip6h; |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1462 | struct icmp6hdr _icmph, *ic; |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 1463 | struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */ |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1464 | struct ip_vs_conn *cp; |
| 1465 | struct ip_vs_protocol *pp; |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 1466 | struct ip_vs_proto_data *pd; |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 1467 | unsigned int offs_ciph, writable, verdict; |
| 1468 | |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1469 | *related = 1; |
| 1470 | |
Jesper Dangaard Brouer | 2f74713 | 2012-09-26 14:06:59 +0200 | [diff] [blame] | 1471 | ic = frag_safe_skb_hp(skb, iph->len, sizeof(_icmph), &_icmph, iph); |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1472 | if (ic == NULL) |
| 1473 | return NF_DROP; |
| 1474 | |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1475 | /* |
| 1476 | * Work through seeing if this is for us. |
| 1477 | * These checks are supposed to be in an order that means easy |
| 1478 | * things are checked first to speed up processing.... however |
| 1479 | * this means that some packets will manage to get a long way |
| 1480 | * down this stack and then be rejected, but that's life. |
| 1481 | */ |
Jesper Dangaard Brouer | 2fab891 | 2012-09-26 14:06:11 +0200 | [diff] [blame] | 1482 | if (ic->icmp6_type & ICMPV6_INFOMSG_MASK) { |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1483 | *related = 0; |
| 1484 | return NF_ACCEPT; |
| 1485 | } |
Jesper Dangaard Brouer | 2f74713 | 2012-09-26 14:06:59 +0200 | [diff] [blame] | 1486 | /* Fragment header that is before ICMP header tells us that: |
| 1487 | * it's not an error message since they can't be fragmented. |
| 1488 | */ |
David S. Miller | e716503 | 2012-11-30 12:01:30 -0500 | [diff] [blame] | 1489 | if (iph->flags & IP6_FH_F_FRAG) |
Jesper Dangaard Brouer | 2f74713 | 2012-09-26 14:06:59 +0200 | [diff] [blame] | 1490 | return NF_DROP; |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1491 | |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 1492 | IP_VS_DBG(8, "Incoming ICMPv6 (%d,%d) %pI6c->%pI6c\n", |
| 1493 | ic->icmp6_type, ntohs(icmpv6_id(ic)), |
| 1494 | &iph->saddr, &iph->daddr); |
| 1495 | |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1496 | /* Now find the contained IP header */ |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 1497 | ciph.len = iph->len + sizeof(_icmph); |
| 1498 | offs_ciph = ciph.len; /* Save ip header offset */ |
| 1499 | ip6h = skb_header_pointer(skb, ciph.len, sizeof(_ip6h), &_ip6h); |
| 1500 | if (ip6h == NULL) |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1501 | return NF_ACCEPT; /* The packet looks wrong, ignore */ |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 1502 | ciph.saddr.in6 = ip6h->saddr; /* conn_in_get() handles reverse order */ |
| 1503 | ciph.daddr.in6 = ip6h->daddr; |
| 1504 | /* skip possible IPv6 exthdrs of contained IPv6 packet */ |
| 1505 | ciph.protocol = ipv6_find_hdr(skb, &ciph.len, -1, &ciph.fragoffs, NULL); |
| 1506 | if (ciph.protocol < 0) |
| 1507 | return NF_ACCEPT; /* Contained IPv6 hdr looks wrong, ignore */ |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1508 | |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 1509 | net = skb_net(skb); |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 1510 | pd = ip_vs_proto_data_get(net, ciph.protocol); |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 1511 | if (!pd) |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1512 | return NF_ACCEPT; |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 1513 | pp = pd->pp; |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1514 | |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 1515 | /* Cannot handle fragmented embedded protocol */ |
| 1516 | if (ciph.fragoffs) |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1517 | return NF_ACCEPT; |
| 1518 | |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 1519 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, offs_ciph, |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 1520 | "Checking incoming ICMPv6 for"); |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1521 | |
Jesper Dangaard Brouer | 2f74713 | 2012-09-26 14:06:59 +0200 | [diff] [blame] | 1522 | /* The embedded headers contain source and dest in reverse order |
| 1523 | * if not from localhost |
| 1524 | */ |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 1525 | cp = pp->conn_in_get(AF_INET6, skb, &ciph, |
Jesper Dangaard Brouer | 2f74713 | 2012-09-26 14:06:59 +0200 | [diff] [blame] | 1526 | (hooknum == NF_INET_LOCAL_OUT) ? 0 : 1); |
| 1527 | |
Julian Anastasov | 6cb90db | 2011-02-09 02:26:38 +0200 | [diff] [blame] | 1528 | if (!cp) |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1529 | return NF_ACCEPT; |
Jesper Dangaard Brouer | 2f74713 | 2012-09-26 14:06:59 +0200 | [diff] [blame] | 1530 | /* VS/TUN, VS/DR and LOCALNODE just let it go */ |
| 1531 | if ((hooknum == NF_INET_LOCAL_OUT) && |
| 1532 | (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)) { |
| 1533 | __ip_vs_conn_put(cp); |
| 1534 | return NF_ACCEPT; |
| 1535 | } |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1536 | |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1537 | /* do the statistics and put it back */ |
| 1538 | ip_vs_in_stats(cp, skb); |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 1539 | |
| 1540 | /* Need to mangle contained IPv6 header in ICMPv6 packet */ |
| 1541 | writable = ciph.len; |
| 1542 | if (IPPROTO_TCP == ciph.protocol || IPPROTO_UDP == ciph.protocol || |
| 1543 | IPPROTO_SCTP == ciph.protocol) |
| 1544 | writable += 2 * sizeof(__u16); /* Also mangle ports */ |
| 1545 | |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 1546 | verdict = ip_vs_icmp_xmit_v6(skb, cp, pp, writable, hooknum, &ciph); |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1547 | |
| 1548 | __ip_vs_conn_put(cp); |
| 1549 | |
| 1550 | return verdict; |
| 1551 | } |
| 1552 | #endif |
| 1553 | |
| 1554 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | /* |
| 1556 | * Check if it's for virtual services, look it up, |
| 1557 | * and send it on its way... |
| 1558 | */ |
| 1559 | static unsigned int |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1560 | ip_vs_in(unsigned int hooknum, struct sk_buff *skb, int af) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | { |
Hans Schillstrom | f131315 | 2011-01-03 14:44:55 +0100 | [diff] [blame] | 1562 | struct net *net; |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 1563 | struct ip_vs_iphdr iph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1564 | struct ip_vs_protocol *pp; |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 1565 | struct ip_vs_proto_data *pd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1566 | struct ip_vs_conn *cp; |
Simon Horman | 4a516f1 | 2011-09-16 14:11:49 +0900 | [diff] [blame] | 1567 | int ret, pkts; |
Hans Schillstrom | f131315 | 2011-01-03 14:44:55 +0100 | [diff] [blame] | 1568 | struct netns_ipvs *ipvs; |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 1569 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1570 | /* Already marked as IPVS request or reply? */ |
| 1571 | if (skb->ipvs_property) |
| 1572 | return NF_ACCEPT; |
| 1573 | |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1574 | /* |
| 1575 | * Big tappo: |
| 1576 | * - remote client: only PACKET_HOST |
| 1577 | * - route: used for struct net when skb->dev is unset |
| 1578 | */ |
| 1579 | if (unlikely((skb->pkt_type != PACKET_HOST && |
| 1580 | hooknum != NF_INET_LOCAL_OUT) || |
| 1581 | !skb_dst(skb))) { |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 1582 | ip_vs_fill_iph_skb(af, skb, &iph); |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1583 | IP_VS_DBG_BUF(12, "packet type=%d proto=%d daddr=%s" |
| 1584 | " ignored in hook %u\n", |
| 1585 | skb->pkt_type, iph.protocol, |
| 1586 | IP_VS_DBG_ADDR(af, &iph.daddr), hooknum); |
| 1587 | return NF_ACCEPT; |
| 1588 | } |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 1589 | /* ipvs enabled in this netns ? */ |
| 1590 | net = skb_net(skb); |
Julian Anastasov | 0c12582 | 2013-03-09 23:25:04 +0200 | [diff] [blame] | 1591 | ipvs = net_ipvs(net); |
| 1592 | if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable)) |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 1593 | return NF_ACCEPT; |
| 1594 | |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 1595 | ip_vs_fill_iph_skb(af, skb, &iph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1597 | /* Bad... Do not break raw sockets */ |
| 1598 | if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT && |
| 1599 | af == AF_INET)) { |
| 1600 | struct sock *sk = skb->sk; |
| 1601 | struct inet_sock *inet = inet_sk(skb->sk); |
| 1602 | |
| 1603 | if (inet && sk->sk_family == PF_INET && inet->nodefrag) |
| 1604 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1605 | } |
| 1606 | |
Julius Volz | 94b2655 | 2009-08-31 16:22:23 +0200 | [diff] [blame] | 1607 | #ifdef CONFIG_IP_VS_IPV6 |
| 1608 | if (af == AF_INET6) { |
Jesper Dangaard Brouer | 2f74713 | 2012-09-26 14:06:59 +0200 | [diff] [blame] | 1609 | if (!iph.fragoffs && skb_nfct_reasm(skb)) { |
| 1610 | struct sk_buff *reasm = skb_nfct_reasm(skb); |
| 1611 | /* Save fw mark for coming frags. */ |
| 1612 | reasm->ipvs_property = 1; |
| 1613 | reasm->mark = skb->mark; |
| 1614 | } |
Julius Volz | 94b2655 | 2009-08-31 16:22:23 +0200 | [diff] [blame] | 1615 | if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { |
Julian Anastasov | 1ca5bb5 | 2010-10-17 16:32:29 +0300 | [diff] [blame] | 1616 | int related; |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 1617 | int verdict = ip_vs_in_icmp_v6(skb, &related, hooknum, |
| 1618 | &iph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1619 | |
Julius Volz | 94b2655 | 2009-08-31 16:22:23 +0200 | [diff] [blame] | 1620 | if (related) |
| 1621 | return verdict; |
Julius Volz | 94b2655 | 2009-08-31 16:22:23 +0200 | [diff] [blame] | 1622 | } |
| 1623 | } else |
| 1624 | #endif |
| 1625 | if (unlikely(iph.protocol == IPPROTO_ICMP)) { |
Julian Anastasov | 1ca5bb5 | 2010-10-17 16:32:29 +0300 | [diff] [blame] | 1626 | int related; |
| 1627 | int verdict = ip_vs_in_icmp(skb, &related, hooknum); |
Julius Volz | 94b2655 | 2009-08-31 16:22:23 +0200 | [diff] [blame] | 1628 | |
| 1629 | if (related) |
| 1630 | return verdict; |
Julius Volz | 94b2655 | 2009-08-31 16:22:23 +0200 | [diff] [blame] | 1631 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | |
| 1633 | /* Protocol supported? */ |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 1634 | pd = ip_vs_proto_data_get(net, iph.protocol); |
| 1635 | if (unlikely(!pd)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | return NF_ACCEPT; |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 1637 | pp = pd->pp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1638 | /* |
| 1639 | * Check if the packet belongs to an existing connection entry |
| 1640 | */ |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 1641 | cp = pp->conn_in_get(af, skb, &iph, 0); |
Grzegorz Lyczba | dc7b3eb | 2013-05-13 23:56:24 +0200 | [diff] [blame] | 1642 | |
| 1643 | if (unlikely(sysctl_expire_nodest_conn(ipvs)) && cp && cp->dest && |
| 1644 | unlikely(!atomic_read(&cp->dest->weight)) && !iph.fragoffs && |
| 1645 | is_new_conn(skb, &iph)) { |
| 1646 | ip_vs_conn_expire_now(cp); |
| 1647 | __ip_vs_conn_put(cp); |
| 1648 | cp = NULL; |
| 1649 | } |
| 1650 | |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 1651 | if (unlikely(!cp) && !iph.fragoffs) { |
Jesper Dangaard Brouer | 2f74713 | 2012-09-26 14:06:59 +0200 | [diff] [blame] | 1652 | /* No (second) fragments need to enter here, as nf_defrag_ipv6 |
| 1653 | * replayed fragment zero will already have created the cp |
| 1654 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | int v; |
| 1656 | |
Jesper Dangaard Brouer | 2f74713 | 2012-09-26 14:06:59 +0200 | [diff] [blame] | 1657 | /* Schedule and create new connection entry into &cp */ |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 1658 | if (!pp->conn_schedule(af, skb, pd, &v, &cp, &iph)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | return v; |
| 1660 | } |
| 1661 | |
| 1662 | if (unlikely(!cp)) { |
| 1663 | /* sorry, all this trouble for a no-hit :) */ |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 1664 | IP_VS_DBG_PKT(12, af, pp, skb, 0, |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1665 | "ip_vs_in: packet continues traversal as normal"); |
Jesper Dangaard Brouer | 2f74713 | 2012-09-26 14:06:59 +0200 | [diff] [blame] | 1666 | if (iph.fragoffs && !skb_nfct_reasm(skb)) { |
| 1667 | /* Fragment that couldn't be mapped to a conn entry |
| 1668 | * and don't have any pointer to a reasm skb |
| 1669 | * is missing module nf_defrag_ipv6 |
| 1670 | */ |
| 1671 | IP_VS_DBG_RL("Unhandled frag, load nf_defrag_ipv6\n"); |
| 1672 | IP_VS_DBG_PKT(7, af, pp, skb, 0, "unhandled fragment"); |
| 1673 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | return NF_ACCEPT; |
| 1675 | } |
| 1676 | |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 1677 | IP_VS_DBG_PKT(11, af, pp, skb, 0, "Incoming packet"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1678 | /* Check the server status */ |
| 1679 | if (cp->dest && !(cp->dest->flags & IP_VS_DEST_F_AVAILABLE)) { |
| 1680 | /* the destination server is not available */ |
| 1681 | |
Simon Horman | 71a8ab6 | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 1682 | if (sysctl_expire_nodest_conn(ipvs)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | /* try to expire the connection immediately */ |
| 1684 | ip_vs_conn_expire_now(cp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1685 | } |
Julian Anastasov | dc8103f | 2005-11-08 09:40:05 -0800 | [diff] [blame] | 1686 | /* don't restart its timer, and silently |
| 1687 | drop the packet. */ |
| 1688 | __ip_vs_conn_put(cp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | return NF_DROP; |
| 1690 | } |
| 1691 | |
| 1692 | ip_vs_in_stats(cp, skb); |
Simon Horman | 4a516f1 | 2011-09-16 14:11:49 +0900 | [diff] [blame] | 1693 | ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | if (cp->packet_xmit) |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 1695 | ret = cp->packet_xmit(skb, cp, pp, &iph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | /* do not touch skb anymore */ |
| 1697 | else { |
| 1698 | IP_VS_DBG_RL("warning: packet_xmit is null"); |
| 1699 | ret = NF_ACCEPT; |
| 1700 | } |
| 1701 | |
Rumen G. Bogdanovski | efac527 | 2007-11-07 02:36:55 -0800 | [diff] [blame] | 1702 | /* Increase its packet counter and check if it is needed |
| 1703 | * to be synchronized |
| 1704 | * |
| 1705 | * Sync connection if it is about to close to |
| 1706 | * encorage the standby servers to update the connections timeout |
Hans Schillstrom | 986a075 | 2010-11-19 14:25:13 +0100 | [diff] [blame] | 1707 | * |
| 1708 | * For ONE_PKT let ip_vs_sync_conn() do the filter work. |
Rumen G. Bogdanovski | efac527 | 2007-11-07 02:36:55 -0800 | [diff] [blame] | 1709 | */ |
Hans Schillstrom | f131315 | 2011-01-03 14:44:55 +0100 | [diff] [blame] | 1710 | |
Hans Schillstrom | 986a075 | 2010-11-19 14:25:13 +0100 | [diff] [blame] | 1711 | if (cp->flags & IP_VS_CONN_F_ONE_PACKET) |
Simon Horman | 59e0350 | 2011-02-04 18:33:01 +0900 | [diff] [blame] | 1712 | pkts = sysctl_sync_threshold(ipvs); |
Hans Schillstrom | 986a075 | 2010-11-19 14:25:13 +0100 | [diff] [blame] | 1713 | else |
| 1714 | pkts = atomic_add_return(1, &cp->in_pkts); |
| 1715 | |
Julian Anastasov | 749c42b | 2012-04-24 23:46:40 +0300 | [diff] [blame] | 1716 | if (ipvs->sync_state & IP_VS_STATE_MASTER) |
| 1717 | ip_vs_sync_conn(net, cp, pkts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | |
| 1719 | ip_vs_conn_put(cp); |
| 1720 | return ret; |
| 1721 | } |
| 1722 | |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1723 | /* |
| 1724 | * AF_INET handler in NF_INET_LOCAL_IN chain |
| 1725 | * Schedule and forward packets from remote clients |
| 1726 | */ |
| 1727 | static unsigned int |
| 1728 | ip_vs_remote_request4(unsigned int hooknum, struct sk_buff *skb, |
| 1729 | const struct net_device *in, |
| 1730 | const struct net_device *out, |
| 1731 | int (*okfn)(struct sk_buff *)) |
| 1732 | { |
| 1733 | return ip_vs_in(hooknum, skb, AF_INET); |
| 1734 | } |
| 1735 | |
| 1736 | /* |
| 1737 | * AF_INET handler in NF_INET_LOCAL_OUT chain |
| 1738 | * Schedule and forward packets from local clients |
| 1739 | */ |
| 1740 | static unsigned int |
| 1741 | ip_vs_local_request4(unsigned int hooknum, struct sk_buff *skb, |
| 1742 | const struct net_device *in, const struct net_device *out, |
| 1743 | int (*okfn)(struct sk_buff *)) |
| 1744 | { |
Julian Anastasov | ac69269 | 2013-03-22 11:46:54 +0200 | [diff] [blame] | 1745 | return ip_vs_in(hooknum, skb, AF_INET); |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1746 | } |
| 1747 | |
| 1748 | #ifdef CONFIG_IP_VS_IPV6 |
| 1749 | |
| 1750 | /* |
Jesper Dangaard Brouer | 2f74713 | 2012-09-26 14:06:59 +0200 | [diff] [blame] | 1751 | * AF_INET6 fragment handling |
| 1752 | * Copy info from first fragment, to the rest of them. |
| 1753 | */ |
| 1754 | static unsigned int |
| 1755 | ip_vs_preroute_frag6(unsigned int hooknum, struct sk_buff *skb, |
| 1756 | const struct net_device *in, |
| 1757 | const struct net_device *out, |
| 1758 | int (*okfn)(struct sk_buff *)) |
| 1759 | { |
| 1760 | struct sk_buff *reasm = skb_nfct_reasm(skb); |
| 1761 | struct net *net; |
| 1762 | |
| 1763 | /* Skip if not a "replay" from nf_ct_frag6_output or first fragment. |
| 1764 | * ipvs_property is set when checking first fragment |
| 1765 | * in ip_vs_in() and ip_vs_out(). |
| 1766 | */ |
| 1767 | if (reasm) |
| 1768 | IP_VS_DBG(2, "Fragment recv prop:%d\n", reasm->ipvs_property); |
| 1769 | if (!reasm || !reasm->ipvs_property) |
| 1770 | return NF_ACCEPT; |
| 1771 | |
| 1772 | net = skb_net(skb); |
| 1773 | if (!net_ipvs(net)->enable) |
| 1774 | return NF_ACCEPT; |
| 1775 | |
| 1776 | /* Copy stored fw mark, saved in ip_vs_{in,out} */ |
| 1777 | skb->mark = reasm->mark; |
| 1778 | |
| 1779 | return NF_ACCEPT; |
| 1780 | } |
| 1781 | |
| 1782 | /* |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1783 | * AF_INET6 handler in NF_INET_LOCAL_IN chain |
| 1784 | * Schedule and forward packets from remote clients |
| 1785 | */ |
| 1786 | static unsigned int |
| 1787 | ip_vs_remote_request6(unsigned int hooknum, struct sk_buff *skb, |
| 1788 | const struct net_device *in, |
| 1789 | const struct net_device *out, |
| 1790 | int (*okfn)(struct sk_buff *)) |
| 1791 | { |
| 1792 | return ip_vs_in(hooknum, skb, AF_INET6); |
| 1793 | } |
| 1794 | |
| 1795 | /* |
| 1796 | * AF_INET6 handler in NF_INET_LOCAL_OUT chain |
| 1797 | * Schedule and forward packets from local clients |
| 1798 | */ |
| 1799 | static unsigned int |
| 1800 | ip_vs_local_request6(unsigned int hooknum, struct sk_buff *skb, |
| 1801 | const struct net_device *in, const struct net_device *out, |
| 1802 | int (*okfn)(struct sk_buff *)) |
| 1803 | { |
Julian Anastasov | ac69269 | 2013-03-22 11:46:54 +0200 | [diff] [blame] | 1804 | return ip_vs_in(hooknum, skb, AF_INET6); |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1805 | } |
| 1806 | |
| 1807 | #endif |
| 1808 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1809 | |
| 1810 | /* |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1811 | * It is hooked at the NF_INET_FORWARD chain, in order to catch ICMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1812 | * related packets destined for 0.0.0.0/0. |
| 1813 | * When fwmark-based virtual service is used, such as transparent |
| 1814 | * cache cluster, TCP packets can be marked and routed to ip_vs_in, |
| 1815 | * but ICMP destined for 0.0.0.0/0 cannot not be easily marked and |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1816 | * sent to ip_vs_in_icmp. So, catch them at the NF_INET_FORWARD chain |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1817 | * and send them to ip_vs_in_icmp. |
| 1818 | */ |
| 1819 | static unsigned int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1820 | ip_vs_forward_icmp(unsigned int hooknum, struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1821 | const struct net_device *in, const struct net_device *out, |
| 1822 | int (*okfn)(struct sk_buff *)) |
| 1823 | { |
| 1824 | int r; |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 1825 | struct net *net; |
Julian Anastasov | 0c12582 | 2013-03-09 23:25:04 +0200 | [diff] [blame] | 1826 | struct netns_ipvs *ipvs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1827 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1828 | if (ip_hdr(skb)->protocol != IPPROTO_ICMP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1829 | return NF_ACCEPT; |
| 1830 | |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 1831 | /* ipvs enabled in this netns ? */ |
| 1832 | net = skb_net(skb); |
Julian Anastasov | 0c12582 | 2013-03-09 23:25:04 +0200 | [diff] [blame] | 1833 | ipvs = net_ipvs(net); |
| 1834 | if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable)) |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 1835 | return NF_ACCEPT; |
| 1836 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1837 | return ip_vs_in_icmp(skb, &r, hooknum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1838 | } |
| 1839 | |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1840 | #ifdef CONFIG_IP_VS_IPV6 |
| 1841 | static unsigned int |
| 1842 | ip_vs_forward_icmp_v6(unsigned int hooknum, struct sk_buff *skb, |
| 1843 | const struct net_device *in, const struct net_device *out, |
| 1844 | int (*okfn)(struct sk_buff *)) |
| 1845 | { |
| 1846 | int r; |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 1847 | struct net *net; |
Julian Anastasov | 0c12582 | 2013-03-09 23:25:04 +0200 | [diff] [blame] | 1848 | struct netns_ipvs *ipvs; |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 1849 | struct ip_vs_iphdr iphdr; |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1850 | |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 1851 | ip_vs_fill_iph_skb(AF_INET6, skb, &iphdr); |
| 1852 | if (iphdr.protocol != IPPROTO_ICMPV6) |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1853 | return NF_ACCEPT; |
| 1854 | |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 1855 | /* ipvs enabled in this netns ? */ |
| 1856 | net = skb_net(skb); |
Julian Anastasov | 0c12582 | 2013-03-09 23:25:04 +0200 | [diff] [blame] | 1857 | ipvs = net_ipvs(net); |
| 1858 | if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable)) |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 1859 | return NF_ACCEPT; |
| 1860 | |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 1861 | return ip_vs_in_icmp_v6(skb, &r, hooknum, &iphdr); |
Julius Volz | 2a3b791 | 2008-09-02 15:55:47 +0200 | [diff] [blame] | 1862 | } |
| 1863 | #endif |
| 1864 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1865 | |
Patrick McHardy | 1999414 | 2007-12-05 01:23:00 -0800 | [diff] [blame] | 1866 | static struct nf_hook_ops ip_vs_ops[] __read_mostly = { |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1867 | /* After packet filtering, change source only for VS/NAT */ |
| 1868 | { |
| 1869 | .hook = ip_vs_reply4, |
| 1870 | .owner = THIS_MODULE, |
Alban Crequy | 4c809d6 | 2012-05-14 03:56:38 +0000 | [diff] [blame] | 1871 | .pf = NFPROTO_IPV4, |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1872 | .hooknum = NF_INET_LOCAL_IN, |
Julian Anastasov | afb523c | 2011-06-02 09:09:54 +0900 | [diff] [blame] | 1873 | .priority = NF_IP_PRI_NAT_SRC - 2, |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1874 | }, |
Patrick McHardy | 41c5b31 | 2007-12-05 01:22:43 -0800 | [diff] [blame] | 1875 | /* After packet filtering, forward packet through VS/DR, VS/TUN, |
| 1876 | * or VS/NAT(change destination), so that filtering rules can be |
| 1877 | * applied to IPVS. */ |
| 1878 | { |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1879 | .hook = ip_vs_remote_request4, |
Patrick McHardy | 41c5b31 | 2007-12-05 01:22:43 -0800 | [diff] [blame] | 1880 | .owner = THIS_MODULE, |
Alban Crequy | 4c809d6 | 2012-05-14 03:56:38 +0000 | [diff] [blame] | 1881 | .pf = NFPROTO_IPV4, |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1882 | .hooknum = NF_INET_LOCAL_IN, |
Julian Anastasov | afb523c | 2011-06-02 09:09:54 +0900 | [diff] [blame] | 1883 | .priority = NF_IP_PRI_NAT_SRC - 1, |
Patrick McHardy | 41c5b31 | 2007-12-05 01:22:43 -0800 | [diff] [blame] | 1884 | }, |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1885 | /* Before ip_vs_in, change source only for VS/NAT */ |
Patrick McHardy | 41c5b31 | 2007-12-05 01:22:43 -0800 | [diff] [blame] | 1886 | { |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1887 | .hook = ip_vs_local_reply4, |
Patrick McHardy | 41c5b31 | 2007-12-05 01:22:43 -0800 | [diff] [blame] | 1888 | .owner = THIS_MODULE, |
Alban Crequy | 4c809d6 | 2012-05-14 03:56:38 +0000 | [diff] [blame] | 1889 | .pf = NFPROTO_IPV4, |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1890 | .hooknum = NF_INET_LOCAL_OUT, |
Julian Anastasov | afb523c | 2011-06-02 09:09:54 +0900 | [diff] [blame] | 1891 | .priority = NF_IP_PRI_NAT_DST + 1, |
Patrick McHardy | 41c5b31 | 2007-12-05 01:22:43 -0800 | [diff] [blame] | 1892 | }, |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1893 | /* After mangle, schedule and forward local requests */ |
| 1894 | { |
| 1895 | .hook = ip_vs_local_request4, |
| 1896 | .owner = THIS_MODULE, |
Alban Crequy | 4c809d6 | 2012-05-14 03:56:38 +0000 | [diff] [blame] | 1897 | .pf = NFPROTO_IPV4, |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1898 | .hooknum = NF_INET_LOCAL_OUT, |
Julian Anastasov | afb523c | 2011-06-02 09:09:54 +0900 | [diff] [blame] | 1899 | .priority = NF_IP_PRI_NAT_DST + 2, |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1900 | }, |
Patrick McHardy | 41c5b31 | 2007-12-05 01:22:43 -0800 | [diff] [blame] | 1901 | /* After packet filtering (but before ip_vs_out_icmp), catch icmp |
| 1902 | * destined for 0.0.0.0/0, which is for incoming IPVS connections */ |
| 1903 | { |
| 1904 | .hook = ip_vs_forward_icmp, |
| 1905 | .owner = THIS_MODULE, |
Alban Crequy | 4c809d6 | 2012-05-14 03:56:38 +0000 | [diff] [blame] | 1906 | .pf = NFPROTO_IPV4, |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1907 | .hooknum = NF_INET_FORWARD, |
| 1908 | .priority = 99, |
Patrick McHardy | 41c5b31 | 2007-12-05 01:22:43 -0800 | [diff] [blame] | 1909 | }, |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1910 | /* After packet filtering, change source only for VS/NAT */ |
| 1911 | { |
| 1912 | .hook = ip_vs_reply4, |
| 1913 | .owner = THIS_MODULE, |
Alban Crequy | 4c809d6 | 2012-05-14 03:56:38 +0000 | [diff] [blame] | 1914 | .pf = NFPROTO_IPV4, |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1915 | .hooknum = NF_INET_FORWARD, |
| 1916 | .priority = 100, |
| 1917 | }, |
Julius Volz | 473b23d | 2008-09-02 15:55:54 +0200 | [diff] [blame] | 1918 | #ifdef CONFIG_IP_VS_IPV6 |
Jesper Dangaard Brouer | 2f74713 | 2012-09-26 14:06:59 +0200 | [diff] [blame] | 1919 | /* After mangle & nat fetch 2:nd fragment and following */ |
| 1920 | { |
| 1921 | .hook = ip_vs_preroute_frag6, |
| 1922 | .owner = THIS_MODULE, |
| 1923 | .pf = NFPROTO_IPV6, |
| 1924 | .hooknum = NF_INET_PRE_ROUTING, |
| 1925 | .priority = NF_IP6_PRI_NAT_DST + 1, |
| 1926 | }, |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1927 | /* After packet filtering, change source only for VS/NAT */ |
| 1928 | { |
| 1929 | .hook = ip_vs_reply6, |
| 1930 | .owner = THIS_MODULE, |
Alban Crequy | 4c809d6 | 2012-05-14 03:56:38 +0000 | [diff] [blame] | 1931 | .pf = NFPROTO_IPV6, |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1932 | .hooknum = NF_INET_LOCAL_IN, |
Julian Anastasov | afb523c | 2011-06-02 09:09:54 +0900 | [diff] [blame] | 1933 | .priority = NF_IP6_PRI_NAT_SRC - 2, |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1934 | }, |
Julius Volz | 473b23d | 2008-09-02 15:55:54 +0200 | [diff] [blame] | 1935 | /* After packet filtering, forward packet through VS/DR, VS/TUN, |
| 1936 | * or VS/NAT(change destination), so that filtering rules can be |
| 1937 | * applied to IPVS. */ |
| 1938 | { |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1939 | .hook = ip_vs_remote_request6, |
Julius Volz | 473b23d | 2008-09-02 15:55:54 +0200 | [diff] [blame] | 1940 | .owner = THIS_MODULE, |
Alban Crequy | 4c809d6 | 2012-05-14 03:56:38 +0000 | [diff] [blame] | 1941 | .pf = NFPROTO_IPV6, |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1942 | .hooknum = NF_INET_LOCAL_IN, |
Julian Anastasov | afb523c | 2011-06-02 09:09:54 +0900 | [diff] [blame] | 1943 | .priority = NF_IP6_PRI_NAT_SRC - 1, |
Julius Volz | 473b23d | 2008-09-02 15:55:54 +0200 | [diff] [blame] | 1944 | }, |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1945 | /* Before ip_vs_in, change source only for VS/NAT */ |
Julius Volz | 473b23d | 2008-09-02 15:55:54 +0200 | [diff] [blame] | 1946 | { |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1947 | .hook = ip_vs_local_reply6, |
Julius Volz | 473b23d | 2008-09-02 15:55:54 +0200 | [diff] [blame] | 1948 | .owner = THIS_MODULE, |
Alban Crequy | 4c809d6 | 2012-05-14 03:56:38 +0000 | [diff] [blame] | 1949 | .pf = NFPROTO_IPV4, |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1950 | .hooknum = NF_INET_LOCAL_OUT, |
Julian Anastasov | afb523c | 2011-06-02 09:09:54 +0900 | [diff] [blame] | 1951 | .priority = NF_IP6_PRI_NAT_DST + 1, |
Julius Volz | 473b23d | 2008-09-02 15:55:54 +0200 | [diff] [blame] | 1952 | }, |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1953 | /* After mangle, schedule and forward local requests */ |
| 1954 | { |
| 1955 | .hook = ip_vs_local_request6, |
| 1956 | .owner = THIS_MODULE, |
Alban Crequy | 4c809d6 | 2012-05-14 03:56:38 +0000 | [diff] [blame] | 1957 | .pf = NFPROTO_IPV6, |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1958 | .hooknum = NF_INET_LOCAL_OUT, |
Julian Anastasov | afb523c | 2011-06-02 09:09:54 +0900 | [diff] [blame] | 1959 | .priority = NF_IP6_PRI_NAT_DST + 2, |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1960 | }, |
Julius Volz | 473b23d | 2008-09-02 15:55:54 +0200 | [diff] [blame] | 1961 | /* After packet filtering (but before ip_vs_out_icmp), catch icmp |
| 1962 | * destined for 0.0.0.0/0, which is for incoming IPVS connections */ |
| 1963 | { |
| 1964 | .hook = ip_vs_forward_icmp_v6, |
| 1965 | .owner = THIS_MODULE, |
Alban Crequy | 4c809d6 | 2012-05-14 03:56:38 +0000 | [diff] [blame] | 1966 | .pf = NFPROTO_IPV6, |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1967 | .hooknum = NF_INET_FORWARD, |
| 1968 | .priority = 99, |
Julius Volz | 473b23d | 2008-09-02 15:55:54 +0200 | [diff] [blame] | 1969 | }, |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1970 | /* After packet filtering, change source only for VS/NAT */ |
| 1971 | { |
| 1972 | .hook = ip_vs_reply6, |
| 1973 | .owner = THIS_MODULE, |
Alban Crequy | 4c809d6 | 2012-05-14 03:56:38 +0000 | [diff] [blame] | 1974 | .pf = NFPROTO_IPV6, |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1975 | .hooknum = NF_INET_FORWARD, |
| 1976 | .priority = 100, |
| 1977 | }, |
Julius Volz | 473b23d | 2008-09-02 15:55:54 +0200 | [diff] [blame] | 1978 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1979 | }; |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 1980 | /* |
| 1981 | * Initialize IP Virtual Server netns mem. |
| 1982 | */ |
| 1983 | static int __net_init __ip_vs_init(struct net *net) |
| 1984 | { |
| 1985 | struct netns_ipvs *ipvs; |
| 1986 | |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 1987 | ipvs = net_generic(net, ip_vs_net_id); |
Joe Perches | 0a9ee81 | 2011-08-29 14:17:25 -0700 | [diff] [blame] | 1988 | if (ipvs == NULL) |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 1989 | return -ENOMEM; |
Joe Perches | 0a9ee81 | 2011-08-29 14:17:25 -0700 | [diff] [blame] | 1990 | |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 1991 | /* Hold the beast until a service is registerd */ |
| 1992 | ipvs->enable = 0; |
Hans Schillstrom | f6340ee | 2011-01-03 14:44:59 +0100 | [diff] [blame] | 1993 | ipvs->net = net; |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 1994 | /* Counters used for creating unique names */ |
| 1995 | ipvs->gen = atomic_read(&ipvs_netns_cnt); |
| 1996 | atomic_inc(&ipvs_netns_cnt); |
| 1997 | net->ipvs = ipvs; |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 1998 | |
Hans Schillstrom | 503cf15 | 2011-05-01 18:50:16 +0200 | [diff] [blame] | 1999 | if (ip_vs_estimator_net_init(net) < 0) |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2000 | goto estimator_fail; |
| 2001 | |
Hans Schillstrom | 503cf15 | 2011-05-01 18:50:16 +0200 | [diff] [blame] | 2002 | if (ip_vs_control_net_init(net) < 0) |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2003 | goto control_fail; |
| 2004 | |
Hans Schillstrom | 503cf15 | 2011-05-01 18:50:16 +0200 | [diff] [blame] | 2005 | if (ip_vs_protocol_net_init(net) < 0) |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2006 | goto protocol_fail; |
| 2007 | |
Hans Schillstrom | 503cf15 | 2011-05-01 18:50:16 +0200 | [diff] [blame] | 2008 | if (ip_vs_app_net_init(net) < 0) |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2009 | goto app_fail; |
| 2010 | |
Hans Schillstrom | 503cf15 | 2011-05-01 18:50:16 +0200 | [diff] [blame] | 2011 | if (ip_vs_conn_net_init(net) < 0) |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2012 | goto conn_fail; |
| 2013 | |
Hans Schillstrom | 503cf15 | 2011-05-01 18:50:16 +0200 | [diff] [blame] | 2014 | if (ip_vs_sync_net_init(net) < 0) |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2015 | goto sync_fail; |
| 2016 | |
Simon Horman | a870c8c | 2011-02-01 18:21:53 +0100 | [diff] [blame] | 2017 | printk(KERN_INFO "IPVS: Creating netns size=%zu id=%d\n", |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 2018 | sizeof(struct netns_ipvs), ipvs->gen); |
| 2019 | return 0; |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2020 | /* |
| 2021 | * Error handling |
| 2022 | */ |
| 2023 | |
| 2024 | sync_fail: |
Hans Schillstrom | 503cf15 | 2011-05-01 18:50:16 +0200 | [diff] [blame] | 2025 | ip_vs_conn_net_cleanup(net); |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2026 | conn_fail: |
Hans Schillstrom | 503cf15 | 2011-05-01 18:50:16 +0200 | [diff] [blame] | 2027 | ip_vs_app_net_cleanup(net); |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2028 | app_fail: |
Hans Schillstrom | 503cf15 | 2011-05-01 18:50:16 +0200 | [diff] [blame] | 2029 | ip_vs_protocol_net_cleanup(net); |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2030 | protocol_fail: |
Hans Schillstrom | 503cf15 | 2011-05-01 18:50:16 +0200 | [diff] [blame] | 2031 | ip_vs_control_net_cleanup(net); |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2032 | control_fail: |
Hans Schillstrom | 503cf15 | 2011-05-01 18:50:16 +0200 | [diff] [blame] | 2033 | ip_vs_estimator_net_cleanup(net); |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2034 | estimator_fail: |
Julian Anastasov | 39f618b | 2012-04-25 00:29:58 +0300 | [diff] [blame] | 2035 | net->ipvs = NULL; |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2036 | return -ENOMEM; |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 2037 | } |
| 2038 | |
| 2039 | static void __net_exit __ip_vs_cleanup(struct net *net) |
| 2040 | { |
Hans Schillstrom | 503cf15 | 2011-05-01 18:50:16 +0200 | [diff] [blame] | 2041 | ip_vs_service_net_cleanup(net); /* ip_vs_flush() with locks */ |
| 2042 | ip_vs_conn_net_cleanup(net); |
| 2043 | ip_vs_app_net_cleanup(net); |
| 2044 | ip_vs_protocol_net_cleanup(net); |
| 2045 | ip_vs_control_net_cleanup(net); |
| 2046 | ip_vs_estimator_net_cleanup(net); |
Hans Schillstrom | 1ae132b | 2011-05-03 22:09:30 +0200 | [diff] [blame] | 2047 | IP_VS_DBG(2, "ipvs netns %d released\n", net_ipvs(net)->gen); |
Julian Anastasov | 39f618b | 2012-04-25 00:29:58 +0300 | [diff] [blame] | 2048 | net->ipvs = NULL; |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 2049 | } |
| 2050 | |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2051 | static void __net_exit __ip_vs_dev_cleanup(struct net *net) |
| 2052 | { |
| 2053 | EnterFunction(2); |
| 2054 | net_ipvs(net)->enable = 0; /* Disable packet reception */ |
Hans Schillstrom | 8f4e0a1 | 2011-06-13 09:06:57 +0200 | [diff] [blame] | 2055 | smp_wmb(); |
Hans Schillstrom | 503cf15 | 2011-05-01 18:50:16 +0200 | [diff] [blame] | 2056 | ip_vs_sync_net_cleanup(net); |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2057 | LeaveFunction(2); |
| 2058 | } |
| 2059 | |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 2060 | static struct pernet_operations ipvs_core_ops = { |
| 2061 | .init = __ip_vs_init, |
| 2062 | .exit = __ip_vs_cleanup, |
| 2063 | .id = &ip_vs_net_id, |
| 2064 | .size = sizeof(struct netns_ipvs), |
| 2065 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2066 | |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2067 | static struct pernet_operations ipvs_core_dev_ops = { |
| 2068 | .exit = __ip_vs_dev_cleanup, |
| 2069 | }; |
| 2070 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2071 | /* |
| 2072 | * Initialize IP Virtual Server |
| 2073 | */ |
| 2074 | static int __init ip_vs_init(void) |
| 2075 | { |
| 2076 | int ret; |
| 2077 | |
| 2078 | ret = ip_vs_control_init(); |
| 2079 | if (ret < 0) { |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 2080 | pr_err("can't setup control.\n"); |
Hans Schillstrom | 6c8f794 | 2011-06-13 12:19:27 +0200 | [diff] [blame] | 2081 | goto exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2082 | } |
| 2083 | |
| 2084 | ip_vs_protocol_init(); |
| 2085 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2086 | ret = ip_vs_conn_init(); |
| 2087 | if (ret < 0) { |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 2088 | pr_err("can't setup connection table.\n"); |
Hans Schillstrom | 6c8f794 | 2011-06-13 12:19:27 +0200 | [diff] [blame] | 2089 | goto cleanup_protocol; |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 2090 | } |
| 2091 | |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2092 | ret = register_pernet_subsys(&ipvs_core_ops); /* Alloc ip_vs struct */ |
| 2093 | if (ret < 0) |
Hans Schillstrom | 6c8f794 | 2011-06-13 12:19:27 +0200 | [diff] [blame] | 2094 | goto cleanup_conn; |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2095 | |
| 2096 | ret = register_pernet_device(&ipvs_core_dev_ops); |
| 2097 | if (ret < 0) |
| 2098 | goto cleanup_sub; |
| 2099 | |
Patrick McHardy | 41c5b31 | 2007-12-05 01:22:43 -0800 | [diff] [blame] | 2100 | ret = nf_register_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2101 | if (ret < 0) { |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 2102 | pr_err("can't register hooks.\n"); |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2103 | goto cleanup_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2104 | } |
| 2105 | |
Hans Schillstrom | 8537de8 | 2012-04-26 07:47:44 +0200 | [diff] [blame] | 2106 | ret = ip_vs_register_nl_ioctl(); |
| 2107 | if (ret < 0) { |
| 2108 | pr_err("can't register netlink/ioctl.\n"); |
| 2109 | goto cleanup_hooks; |
| 2110 | } |
| 2111 | |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 2112 | pr_info("ipvs loaded.\n"); |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2113 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2114 | return ret; |
| 2115 | |
Hans Schillstrom | 8537de8 | 2012-04-26 07:47:44 +0200 | [diff] [blame] | 2116 | cleanup_hooks: |
| 2117 | nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2118 | cleanup_dev: |
| 2119 | unregister_pernet_device(&ipvs_core_dev_ops); |
| 2120 | cleanup_sub: |
| 2121 | unregister_pernet_subsys(&ipvs_core_ops); |
Hans Schillstrom | 552ad65 | 2011-06-13 12:19:26 +0200 | [diff] [blame] | 2122 | cleanup_conn: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2123 | ip_vs_conn_cleanup(); |
Hans Schillstrom | 552ad65 | 2011-06-13 12:19:26 +0200 | [diff] [blame] | 2124 | cleanup_protocol: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2125 | ip_vs_protocol_cleanup(); |
| 2126 | ip_vs_control_cleanup(); |
Hans Schillstrom | 6c8f794 | 2011-06-13 12:19:27 +0200 | [diff] [blame] | 2127 | exit: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2128 | return ret; |
| 2129 | } |
| 2130 | |
| 2131 | static void __exit ip_vs_cleanup(void) |
| 2132 | { |
Hans Schillstrom | 8537de8 | 2012-04-26 07:47:44 +0200 | [diff] [blame] | 2133 | ip_vs_unregister_nl_ioctl(); |
Patrick McHardy | 41c5b31 | 2007-12-05 01:22:43 -0800 | [diff] [blame] | 2134 | nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
Hans Schillstrom | 7a4f076 | 2011-05-03 22:09:31 +0200 | [diff] [blame] | 2135 | unregister_pernet_device(&ipvs_core_dev_ops); |
| 2136 | unregister_pernet_subsys(&ipvs_core_ops); /* free ip_vs struct */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2137 | ip_vs_conn_cleanup(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2138 | ip_vs_protocol_cleanup(); |
| 2139 | ip_vs_control_cleanup(); |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 2140 | pr_info("ipvs unloaded.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2141 | } |
| 2142 | |
| 2143 | module_init(ip_vs_init); |
| 2144 | module_exit(ip_vs_cleanup); |
| 2145 | MODULE_LICENSE("GPL"); |