1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
175 lines
3.7 KiB
C
175 lines
3.7 KiB
C
/*
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* ip_vs_proto_esp.c: ESP IPSec load balancing support for IPVS
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*
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* Version: $Id: ip_vs_proto_esp.c,v 1.1 2003/07/04 15:04:37 wensong Exp $
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*
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* Authors: Julian Anastasov <ja@ssi.bg>, February 2002
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* Wensong Zhang <wensong@linuxvirtualserver.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation;
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter_ipv4.h>
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#include <net/ip_vs.h>
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/* TODO:
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struct isakmp_hdr {
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__u8 icookie[8];
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__u8 rcookie[8];
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__u8 np;
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__u8 version;
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__u8 xchgtype;
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__u8 flags;
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__u32 msgid;
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__u32 length;
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};
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*/
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#define PORT_ISAKMP 500
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static struct ip_vs_conn *
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esp_conn_in_get(const struct sk_buff *skb,
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struct ip_vs_protocol *pp,
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const struct iphdr *iph,
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unsigned int proto_off,
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int inverse)
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{
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struct ip_vs_conn *cp;
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if (likely(!inverse)) {
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cp = ip_vs_conn_in_get(IPPROTO_UDP,
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iph->saddr,
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__constant_htons(PORT_ISAKMP),
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iph->daddr,
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__constant_htons(PORT_ISAKMP));
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} else {
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cp = ip_vs_conn_in_get(IPPROTO_UDP,
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iph->daddr,
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__constant_htons(PORT_ISAKMP),
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iph->saddr,
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__constant_htons(PORT_ISAKMP));
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}
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if (!cp) {
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/*
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* We are not sure if the packet is from our
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* service, so our conn_schedule hook should return NF_ACCEPT
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*/
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IP_VS_DBG(12, "Unknown ISAKMP entry for outin packet "
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"%s%s %u.%u.%u.%u->%u.%u.%u.%u\n",
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inverse ? "ICMP+" : "",
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pp->name,
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NIPQUAD(iph->saddr),
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NIPQUAD(iph->daddr));
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}
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return cp;
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}
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static struct ip_vs_conn *
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esp_conn_out_get(const struct sk_buff *skb, struct ip_vs_protocol *pp,
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const struct iphdr *iph, unsigned int proto_off, int inverse)
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{
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struct ip_vs_conn *cp;
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if (likely(!inverse)) {
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cp = ip_vs_conn_out_get(IPPROTO_UDP,
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iph->saddr,
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__constant_htons(PORT_ISAKMP),
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iph->daddr,
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__constant_htons(PORT_ISAKMP));
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} else {
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cp = ip_vs_conn_out_get(IPPROTO_UDP,
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iph->daddr,
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__constant_htons(PORT_ISAKMP),
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iph->saddr,
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__constant_htons(PORT_ISAKMP));
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}
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if (!cp) {
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IP_VS_DBG(12, "Unknown ISAKMP entry for inout packet "
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"%s%s %u.%u.%u.%u->%u.%u.%u.%u\n",
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inverse ? "ICMP+" : "",
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pp->name,
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NIPQUAD(iph->saddr),
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NIPQUAD(iph->daddr));
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}
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return cp;
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}
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static int
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esp_conn_schedule(struct sk_buff *skb, struct ip_vs_protocol *pp,
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int *verdict, struct ip_vs_conn **cpp)
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{
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/*
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* ESP is only related traffic. Pass the packet to IP stack.
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*/
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*verdict = NF_ACCEPT;
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return 0;
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}
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static void
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esp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb,
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int offset, const char *msg)
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{
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char buf[256];
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struct iphdr _iph, *ih;
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ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
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if (ih == NULL)
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sprintf(buf, "%s TRUNCATED", pp->name);
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else
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sprintf(buf, "%s %u.%u.%u.%u->%u.%u.%u.%u",
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pp->name, NIPQUAD(ih->saddr),
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NIPQUAD(ih->daddr));
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printk(KERN_DEBUG "IPVS: %s: %s\n", msg, buf);
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}
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static void esp_init(struct ip_vs_protocol *pp)
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{
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/* nothing to do now */
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}
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static void esp_exit(struct ip_vs_protocol *pp)
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{
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/* nothing to do now */
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}
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struct ip_vs_protocol ip_vs_protocol_esp = {
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.name = "ESP",
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.protocol = IPPROTO_ESP,
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.dont_defrag = 1,
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.init = esp_init,
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.exit = esp_exit,
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.conn_schedule = esp_conn_schedule,
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.conn_in_get = esp_conn_in_get,
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.conn_out_get = esp_conn_out_get,
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.snat_handler = NULL,
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.dnat_handler = NULL,
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.csum_check = NULL,
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.state_transition = NULL,
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.register_app = NULL,
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.unregister_app = NULL,
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.app_conn_bind = NULL,
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.debug_packet = esp_debug_packet,
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.timeout_change = NULL, /* ISAKMP */
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};
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