Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * ip_vs_proto_esp.c: ESP IPSec load balancing support for IPVS |
| 3 | * |
| 4 | * Version: $Id: ip_vs_proto_esp.c,v 1.1 2003/07/04 15:04:37 wensong Exp $ |
| 5 | * |
| 6 | * Authors: Julian Anastasov <ja@ssi.bg>, February 2002 |
| 7 | * Wensong Zhang <wensong@linuxvirtualserver.org> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License |
| 11 | * version 2 as published by the Free Software Foundation; |
| 12 | * |
| 13 | */ |
| 14 | |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/netfilter.h> |
| 18 | #include <linux/netfilter_ipv4.h> |
| 19 | |
| 20 | #include <net/ip_vs.h> |
| 21 | |
| 22 | |
| 23 | /* TODO: |
| 24 | |
| 25 | struct isakmp_hdr { |
| 26 | __u8 icookie[8]; |
| 27 | __u8 rcookie[8]; |
| 28 | __u8 np; |
| 29 | __u8 version; |
| 30 | __u8 xchgtype; |
| 31 | __u8 flags; |
| 32 | __u32 msgid; |
| 33 | __u32 length; |
| 34 | }; |
| 35 | |
| 36 | */ |
| 37 | |
| 38 | #define PORT_ISAKMP 500 |
| 39 | |
| 40 | |
| 41 | static struct ip_vs_conn * |
| 42 | esp_conn_in_get(const struct sk_buff *skb, |
| 43 | struct ip_vs_protocol *pp, |
| 44 | const struct iphdr *iph, |
| 45 | unsigned int proto_off, |
| 46 | int inverse) |
| 47 | { |
| 48 | struct ip_vs_conn *cp; |
| 49 | |
| 50 | if (likely(!inverse)) { |
| 51 | cp = ip_vs_conn_in_get(IPPROTO_UDP, |
| 52 | iph->saddr, |
| 53 | __constant_htons(PORT_ISAKMP), |
| 54 | iph->daddr, |
| 55 | __constant_htons(PORT_ISAKMP)); |
| 56 | } else { |
| 57 | cp = ip_vs_conn_in_get(IPPROTO_UDP, |
| 58 | iph->daddr, |
| 59 | __constant_htons(PORT_ISAKMP), |
| 60 | iph->saddr, |
| 61 | __constant_htons(PORT_ISAKMP)); |
| 62 | } |
| 63 | |
| 64 | if (!cp) { |
| 65 | /* |
| 66 | * We are not sure if the packet is from our |
| 67 | * service, so our conn_schedule hook should return NF_ACCEPT |
| 68 | */ |
| 69 | IP_VS_DBG(12, "Unknown ISAKMP entry for outin packet " |
| 70 | "%s%s %u.%u.%u.%u->%u.%u.%u.%u\n", |
| 71 | inverse ? "ICMP+" : "", |
| 72 | pp->name, |
| 73 | NIPQUAD(iph->saddr), |
| 74 | NIPQUAD(iph->daddr)); |
| 75 | } |
| 76 | |
| 77 | return cp; |
| 78 | } |
| 79 | |
| 80 | |
| 81 | static struct ip_vs_conn * |
| 82 | esp_conn_out_get(const struct sk_buff *skb, struct ip_vs_protocol *pp, |
| 83 | const struct iphdr *iph, unsigned int proto_off, int inverse) |
| 84 | { |
| 85 | struct ip_vs_conn *cp; |
| 86 | |
| 87 | if (likely(!inverse)) { |
| 88 | cp = ip_vs_conn_out_get(IPPROTO_UDP, |
| 89 | iph->saddr, |
| 90 | __constant_htons(PORT_ISAKMP), |
| 91 | iph->daddr, |
| 92 | __constant_htons(PORT_ISAKMP)); |
| 93 | } else { |
| 94 | cp = ip_vs_conn_out_get(IPPROTO_UDP, |
| 95 | iph->daddr, |
| 96 | __constant_htons(PORT_ISAKMP), |
| 97 | iph->saddr, |
| 98 | __constant_htons(PORT_ISAKMP)); |
| 99 | } |
| 100 | |
| 101 | if (!cp) { |
| 102 | IP_VS_DBG(12, "Unknown ISAKMP entry for inout packet " |
| 103 | "%s%s %u.%u.%u.%u->%u.%u.%u.%u\n", |
| 104 | inverse ? "ICMP+" : "", |
| 105 | pp->name, |
| 106 | NIPQUAD(iph->saddr), |
| 107 | NIPQUAD(iph->daddr)); |
| 108 | } |
| 109 | |
| 110 | return cp; |
| 111 | } |
| 112 | |
| 113 | |
| 114 | static int |
| 115 | esp_conn_schedule(struct sk_buff *skb, struct ip_vs_protocol *pp, |
| 116 | int *verdict, struct ip_vs_conn **cpp) |
| 117 | { |
| 118 | /* |
| 119 | * ESP is only related traffic. Pass the packet to IP stack. |
| 120 | */ |
| 121 | *verdict = NF_ACCEPT; |
| 122 | return 0; |
| 123 | } |
| 124 | |
| 125 | |
| 126 | static void |
| 127 | esp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb, |
| 128 | int offset, const char *msg) |
| 129 | { |
| 130 | char buf[256]; |
| 131 | struct iphdr _iph, *ih; |
| 132 | |
| 133 | ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph); |
| 134 | if (ih == NULL) |
| 135 | sprintf(buf, "%s TRUNCATED", pp->name); |
| 136 | else |
| 137 | sprintf(buf, "%s %u.%u.%u.%u->%u.%u.%u.%u", |
| 138 | pp->name, NIPQUAD(ih->saddr), |
| 139 | NIPQUAD(ih->daddr)); |
| 140 | |
| 141 | printk(KERN_DEBUG "IPVS: %s: %s\n", msg, buf); |
| 142 | } |
| 143 | |
| 144 | |
| 145 | static void esp_init(struct ip_vs_protocol *pp) |
| 146 | { |
| 147 | /* nothing to do now */ |
| 148 | } |
| 149 | |
| 150 | |
| 151 | static void esp_exit(struct ip_vs_protocol *pp) |
| 152 | { |
| 153 | /* nothing to do now */ |
| 154 | } |
| 155 | |
| 156 | |
| 157 | struct ip_vs_protocol ip_vs_protocol_esp = { |
| 158 | .name = "ESP", |
| 159 | .protocol = IPPROTO_ESP, |
| 160 | .dont_defrag = 1, |
| 161 | .init = esp_init, |
| 162 | .exit = esp_exit, |
| 163 | .conn_schedule = esp_conn_schedule, |
| 164 | .conn_in_get = esp_conn_in_get, |
| 165 | .conn_out_get = esp_conn_out_get, |
| 166 | .snat_handler = NULL, |
| 167 | .dnat_handler = NULL, |
| 168 | .csum_check = NULL, |
| 169 | .state_transition = NULL, |
| 170 | .register_app = NULL, |
| 171 | .unregister_app = NULL, |
| 172 | .app_conn_bind = NULL, |
| 173 | .debug_packet = esp_debug_packet, |
| 174 | .timeout_change = NULL, /* ISAKMP */ |
| 175 | }; |