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Diffstat (limited to 'net/ipv4/ipvs/ip_vs_proto_esp.c')
-rw-r--r--net/ipv4/ipvs/ip_vs_proto_esp.c175
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 000000000000..478e5c7c7e8e
--- /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 */
+};