diff options
Diffstat (limited to 'net/ipv4/ipvs/ip_vs_proto_esp.c')
| -rw-r--r-- | net/ipv4/ipvs/ip_vs_proto_esp.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/net/ipv4/ipvs/ip_vs_proto_esp.c b/net/ipv4/ipvs/ip_vs_proto_esp.c new file mode 100644 index 00000000000..478e5c7c7e8 --- /dev/null +++ b/net/ipv4/ipvs/ip_vs_proto_esp.c @@ -0,0 +1,175 @@ +/* + * ip_vs_proto_esp.c: ESP IPSec load balancing support for IPVS + * + * Version: $Id: ip_vs_proto_esp.c,v 1.1 2003/07/04 15:04:37 wensong Exp $ + * + * Authors: Julian Anastasov <ja@ssi.bg>, February 2002 + * Wensong Zhang <wensong@linuxvirtualserver.org> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation; + * + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/netfilter.h> +#include <linux/netfilter_ipv4.h> + +#include <net/ip_vs.h> + + +/* TODO: + +struct isakmp_hdr { + __u8 icookie[8]; + __u8 rcookie[8]; + __u8 np; + __u8 version; + __u8 xchgtype; + __u8 flags; + __u32 msgid; + __u32 length; +}; + +*/ + +#define PORT_ISAKMP 500 + + +static struct ip_vs_conn * +esp_conn_in_get(const struct sk_buff *skb, + struct ip_vs_protocol *pp, + const struct iphdr *iph, + unsigned int proto_off, + int inverse) +{ + struct ip_vs_conn *cp; + + if (likely(!inverse)) { + cp = ip_vs_conn_in_get(IPPROTO_UDP, + iph->saddr, + __constant_htons(PORT_ISAKMP), + iph->daddr, + __constant_htons(PORT_ISAKMP)); + } else { + cp = ip_vs_conn_in_get(IPPROTO_UDP, + iph->daddr, + __constant_htons(PORT_ISAKMP), + iph->saddr, + __constant_htons(PORT_ISAKMP)); + } + + if (!cp) { + /* + * We are not sure if the packet is from our + * service, so our conn_schedule hook should return NF_ACCEPT + */ + IP_VS_DBG(12, "Unknown ISAKMP entry for outin packet " + "%s%s %u.%u.%u.%u->%u.%u.%u.%u\n", + inverse ? "ICMP+" : "", + pp->name, + NIPQUAD(iph->saddr), + NIPQUAD(iph->daddr)); + } + + return cp; +} + + +static struct ip_vs_conn * +esp_conn_out_get(const struct sk_buff *skb, struct ip_vs_protocol *pp, + const struct iphdr *iph, unsigned int proto_off, int inverse) +{ + struct ip_vs_conn *cp; + + if (likely(!inverse)) { + cp = ip_vs_conn_out_get(IPPROTO_UDP, + iph->saddr, + __constant_htons(PORT_ISAKMP), + iph->daddr, + __constant_htons(PORT_ISAKMP)); + } else { + cp = ip_vs_conn_out_get(IPPROTO_UDP, + iph->daddr, + __constant_htons(PORT_ISAKMP), + iph->saddr, + __constant_htons(PORT_ISAKMP)); + } + + if (!cp) { + IP_VS_DBG(12, "Unknown ISAKMP entry for inout packet " + "%s%s %u.%u.%u.%u->%u.%u.%u.%u\n", + inverse ? "ICMP+" : "", + pp->name, + NIPQUAD(iph->saddr), + NIPQUAD(iph->daddr)); + } + + return cp; +} + + +static int +esp_conn_schedule(struct sk_buff *skb, struct ip_vs_protocol *pp, + int *verdict, struct ip_vs_conn **cpp) +{ + /* + * ESP is only related traffic. Pass the packet to IP stack. + */ + *verdict = NF_ACCEPT; + return 0; +} + + +static void +esp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb, + int offset, const char *msg) +{ + char buf[256]; + struct iphdr _iph, *ih; + + ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph); + if (ih == NULL) + sprintf(buf, "%s TRUNCATED", pp->name); + else + sprintf(buf, "%s %u.%u.%u.%u->%u.%u.%u.%u", + pp->name, NIPQUAD(ih->saddr), + NIPQUAD(ih->daddr)); + + printk(KERN_DEBUG "IPVS: %s: %s\n", msg, buf); +} + + +static void esp_init(struct ip_vs_protocol *pp) +{ + /* nothing to do now */ +} + + +static void esp_exit(struct ip_vs_protocol *pp) +{ + /* nothing to do now */ +} + + +struct ip_vs_protocol ip_vs_protocol_esp = { + .name = "ESP", + .protocol = IPPROTO_ESP, + .dont_defrag = 1, + .init = esp_init, + .exit = esp_exit, + .conn_schedule = esp_conn_schedule, + .conn_in_get = esp_conn_in_get, + .conn_out_get = esp_conn_out_get, + .snat_handler = NULL, + .dnat_handler = NULL, + .csum_check = NULL, + .state_transition = NULL, + .register_app = NULL, + .unregister_app = NULL, + .app_conn_bind = NULL, + .debug_packet = esp_debug_packet, + .timeout_change = NULL, /* ISAKMP */ +}; |