[linux-2.6-block.git] / net / ipv4 / ipvs / ip_vs_proto_ah_esp.c

/*
 * ip_vs_proto_ah_esp.c:	AH/ESP IPSec load balancing support for IPVS
 *
 * 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/in.h>
#include <linux/ip.h>
#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 *
ah_esp_conn_in_get(int af, const struct sk_buff *skb, struct ip_vs_protocol *pp,
		   const struct ip_vs_iphdr *iph, unsigned int proto_off,
		   int inverse)
{
	struct ip_vs_conn *cp;

	if (likely(!inverse)) {
		cp = ip_vs_conn_in_get(af, IPPROTO_UDP,
				       &iph->saddr,
				       htons(PORT_ISAKMP),
				       &iph->daddr,
				       htons(PORT_ISAKMP));
	} else {
		cp = ip_vs_conn_in_get(af, IPPROTO_UDP,
				       &iph->daddr,
				       htons(PORT_ISAKMP),
				       &iph->saddr,
				       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_BUF(12, "Unknown ISAKMP entry for outin packet "
			      "%s%s %s->%s\n",
			      inverse ? "ICMP+" : "",
			      pp->name,
			      IP_VS_DBG_ADDR(af, &iph->saddr),
			      IP_VS_DBG_ADDR(af, &iph->daddr));
	}

	return cp;
}


static struct ip_vs_conn *
ah_esp_conn_out_get(int af, const struct sk_buff *skb,
		    struct ip_vs_protocol *pp,
		    const struct ip_vs_iphdr *iph,
		    unsigned int proto_off,
		    int inverse)
{
	struct ip_vs_conn *cp;

	if (likely(!inverse)) {
		cp = ip_vs_conn_out_get(af, IPPROTO_UDP,
					&iph->saddr,
					htons(PORT_ISAKMP),
					&iph->daddr,
					htons(PORT_ISAKMP));
	} else {
		cp = ip_vs_conn_out_get(af, IPPROTO_UDP,
					&iph->daddr,
					htons(PORT_ISAKMP),
					&iph->saddr,
					htons(PORT_ISAKMP));
	}

	if (!cp) {
		IP_VS_DBG_BUF(12, "Unknown ISAKMP entry for inout packet "
			      "%s%s %s->%s\n",
			      inverse ? "ICMP+" : "",
			      pp->name,
			      IP_VS_DBG_ADDR(af, &iph->saddr),
			      IP_VS_DBG_ADDR(af, &iph->daddr));
	}

	return cp;
}


static int
ah_esp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_protocol *pp,
		     int *verdict, struct ip_vs_conn **cpp)
{
	/*
	 * AH/ESP is only related traffic. Pass the packet to IP stack.
	 */
	*verdict = NF_ACCEPT;
	return 0;
}


static void
ah_esp_debug_packet_v4(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);
}

#ifdef CONFIG_IP_VS_IPV6
static void
ah_esp_debug_packet_v6(struct ip_vs_protocol *pp, const struct sk_buff *skb,
		       int offset, const char *msg)
{
	char buf[256];
	struct ipv6hdr _iph, *ih;

	ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
	if (ih == NULL)
		sprintf(buf, "%s TRUNCATED", pp->name);
	else
		sprintf(buf, "%s " NIP6_FMT "->" NIP6_FMT,
			pp->name, NIP6(ih->saddr),
			NIP6(ih->daddr));

	printk(KERN_DEBUG "IPVS: %s: %s\n", msg, buf);
}
#endif

static void
ah_esp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb,
		    int offset, const char *msg)
{
#ifdef CONFIG_IP_VS_IPV6
	if (skb->protocol == htons(ETH_P_IPV6))
		ah_esp_debug_packet_v6(pp, skb, offset, msg);
	else
#endif
		ah_esp_debug_packet_v4(pp, skb, offset, msg);
}


static void ah_esp_init(struct ip_vs_protocol *pp)
{
	/* nothing to do now */
}


static void ah_esp_exit(struct ip_vs_protocol *pp)
{
	/* nothing to do now */
}


#ifdef CONFIG_IP_VS_PROTO_AH
struct ip_vs_protocol ip_vs_protocol_ah = {
	.name =			"AH",
	.protocol =		IPPROTO_AH,
	.num_states =		1,
	.dont_defrag =		1,
	.init =			ah_esp_init,
	.exit =			ah_esp_exit,
	.conn_schedule =	ah_esp_conn_schedule,
	.conn_in_get =		ah_esp_conn_in_get,
	.conn_out_get =		ah_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 =		ah_esp_debug_packet,
	.timeout_change =	NULL,		/* ISAKMP */
	.set_state_timeout =	NULL,
};
#endif

#ifdef CONFIG_IP_VS_PROTO_ESP
struct ip_vs_protocol ip_vs_protocol_esp = {
	.name =			"ESP",
	.protocol =		IPPROTO_ESP,
	.num_states =		1,
	.dont_defrag =		1,
	.init =			ah_esp_init,
	.exit =			ah_esp_exit,
	.conn_schedule =	ah_esp_conn_schedule,
	.conn_in_get =		ah_esp_conn_in_get,
	.conn_out_get =		ah_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 =		ah_esp_debug_packet,
	.timeout_change =	NULL,		/* ISAKMP */
};
#endif
Commit	Line	Data
1da177e4	1	/*
409a1966	2	* ip_vs_proto_ah_esp.c: AH/ESP IPSec load balancing support for IPVS
1da177e4	3	*
1da177e4 LT	4	* Authors: Julian Anastasov <ja@ssi.bg>, February 2002
	5	* Wensong Zhang <wensong@linuxvirtualserver.org>
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* version 2 as published by the Free Software Foundation;
	10	*
	11	*/
	12
14c85021 ACM	13	#include <linux/in.h>
14c85021 ACM	14	#include <linux/ip.h>
1da177e4 LT	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 *
51ef348b JV	42	ah_esp_conn_in_get(int af, const struct sk_buff skb, struct ip_vs_protocol pp,
51ef348b JV	43	const struct ip_vs_iphdr *iph, unsigned int proto_off,
409a1966	44	int inverse)
1da177e4 LT	45	{
	46	struct ip_vs_conn *cp;
	47
	48	if (likely(!inverse)) {
28364a59 JV	49	cp = ip_vs_conn_in_get(af, IPPROTO_UDP,
28364a59 JV	50	&iph->saddr,
4412ec49	51	htons(PORT_ISAKMP),
28364a59	52	&iph->daddr,
4412ec49	53	htons(PORT_ISAKMP));
1da177e4	54	} else {
28364a59 JV	55	cp = ip_vs_conn_in_get(af, IPPROTO_UDP,
28364a59 JV	56	&iph->daddr,
4412ec49	57	htons(PORT_ISAKMP),
28364a59	58	&iph->saddr,
4412ec49	59	htons(PORT_ISAKMP));
1da177e4 LT	60	}
	61
	62	if (!cp) {
	63	/*
	64	* We are not sure if the packet is from our
	65	* service, so our conn_schedule hook should return NF_ACCEPT
	66	*/
51ef348b JV	67	IP_VS_DBG_BUF(12, "Unknown ISAKMP entry for outin packet "
	68	"%s%s %s->%s\n",
	69	inverse ? "ICMP+" : "",
	70	pp->name,
	71	IP_VS_DBG_ADDR(af, &iph->saddr),
	72	IP_VS_DBG_ADDR(af, &iph->daddr));
1da177e4 LT	73	}
	74
	75	return cp;
	76	}
	77
	78
	79	static struct ip_vs_conn *
51ef348b JV	80	ah_esp_conn_out_get(int af, const struct sk_buff *skb,
	81	struct ip_vs_protocol *pp,
	82	const struct ip_vs_iphdr *iph,
	83	unsigned int proto_off,
	84	int inverse)
1da177e4 LT	85	{
	86	struct ip_vs_conn *cp;
	87
	88	if (likely(!inverse)) {
28364a59 JV	89	cp = ip_vs_conn_out_get(af, IPPROTO_UDP,
28364a59 JV	90	&iph->saddr,
4412ec49	91	htons(PORT_ISAKMP),
28364a59	92	&iph->daddr,
4412ec49	93	htons(PORT_ISAKMP));
1da177e4	94	} else {
28364a59 JV	95	cp = ip_vs_conn_out_get(af, IPPROTO_UDP,
28364a59 JV	96	&iph->daddr,
4412ec49	97	htons(PORT_ISAKMP),
28364a59	98	&iph->saddr,
4412ec49	99	htons(PORT_ISAKMP));
1da177e4 LT	100	}
	101
	102	if (!cp) {
51ef348b JV	103	IP_VS_DBG_BUF(12, "Unknown ISAKMP entry for inout packet "
	104	"%s%s %s->%s\n",
	105	inverse ? "ICMP+" : "",
	106	pp->name,
	107	IP_VS_DBG_ADDR(af, &iph->saddr),
	108	IP_VS_DBG_ADDR(af, &iph->daddr));
1da177e4 LT	109	}
	110
	111	return cp;
	112	}
	113
	114
	115	static int
51ef348b	116	ah_esp_conn_schedule(int af, struct sk_buff skb, struct ip_vs_protocol pp,
409a1966	117	int verdict, struct ip_vs_conn *cpp)
1da177e4 LT	118	{
1da177e4 LT	119	/*
409a1966	120	* AH/ESP is only related traffic. Pass the packet to IP stack.
1da177e4 LT	121	*/
	122	*verdict = NF_ACCEPT;
	123	return 0;
	124	}
	125
	126
	127	static void
3b047d9d JV	128	ah_esp_debug_packet_v4(struct ip_vs_protocol pp, const struct sk_buff skb,
3b047d9d JV	129	int offset, const char *msg)
1da177e4 LT	130	{
	131	char buf[256];
	132	struct iphdr _iph, *ih;
	133
	134	ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
	135	if (ih == NULL)
	136	sprintf(buf, "%s TRUNCATED", pp->name);
	137	else
	138	sprintf(buf, "%s %u.%u.%u.%u->%u.%u.%u.%u",
	139	pp->name, NIPQUAD(ih->saddr),
	140	NIPQUAD(ih->daddr));
	141
	142	printk(KERN_DEBUG "IPVS: %s: %s\n", msg, buf);
	143	}
	144
3b047d9d JV	145	#ifdef CONFIG_IP_VS_IPV6
	146	static void
	147	ah_esp_debug_packet_v6(struct ip_vs_protocol pp, const struct sk_buff skb,
	148	int offset, const char *msg)
	149	{
	150	char buf[256];
	151	struct ipv6hdr _iph, *ih;
	152
	153	ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
	154	if (ih == NULL)
	155	sprintf(buf, "%s TRUNCATED", pp->name);
	156	else
	157	sprintf(buf, "%s " NIP6_FMT "->" NIP6_FMT,
	158	pp->name, NIP6(ih->saddr),
	159	NIP6(ih->daddr));
	160
	161	printk(KERN_DEBUG "IPVS: %s: %s\n", msg, buf);
	162	}
	163	#endif
	164
	165	static void
	166	ah_esp_debug_packet(struct ip_vs_protocol pp, const struct sk_buff skb,
	167	int offset, const char *msg)
	168	{
	169	#ifdef CONFIG_IP_VS_IPV6
d286600e	170	if (skb->protocol == htons(ETH_P_IPV6))
3b047d9d JV	171	ah_esp_debug_packet_v6(pp, skb, offset, msg);
	172	else
	173	#endif
	174	ah_esp_debug_packet_v4(pp, skb, offset, msg);
	175	}
	176
1da177e4	177
409a1966	178	static void ah_esp_init(struct ip_vs_protocol *pp)
1da177e4 LT	179	{
	180	/* nothing to do now */
	181	}
	182
	183
409a1966	184	static void ah_esp_exit(struct ip_vs_protocol *pp)
1da177e4 LT	185	{
	186	/* nothing to do now */
	187	}
	188
	189
409a1966	190	#ifdef CONFIG_IP_VS_PROTO_AH
1da177e4 LT	191	struct ip_vs_protocol ip_vs_protocol_ah = {
	192	.name = "AH",
	193	.protocol = IPPROTO_AH,
2ad17def	194	.num_states = 1,
1da177e4	195	.dont_defrag = 1,
409a1966 JV	196	.init = ah_esp_init,
	197	.exit = ah_esp_exit,
	198	.conn_schedule = ah_esp_conn_schedule,
	199	.conn_in_get = ah_esp_conn_in_get,
	200	.conn_out_get = ah_esp_conn_out_get,
1da177e4 LT	201	.snat_handler = NULL,
	202	.dnat_handler = NULL,
	203	.csum_check = NULL,
	204	.state_transition = NULL,
	205	.register_app = NULL,
	206	.unregister_app = NULL,
	207	.app_conn_bind = NULL,
409a1966	208	.debug_packet = ah_esp_debug_packet,
1da177e4 LT	209	.timeout_change = NULL, /* ISAKMP */
	210	.set_state_timeout = NULL,
	211	};
409a1966 JV	212	#endif
	213
	214	#ifdef CONFIG_IP_VS_PROTO_ESP
	215	struct ip_vs_protocol ip_vs_protocol_esp = {
	216	.name = "ESP",
	217	.protocol = IPPROTO_ESP,
	218	.num_states = 1,
	219	.dont_defrag = 1,
	220	.init = ah_esp_init,
	221	.exit = ah_esp_exit,
	222	.conn_schedule = ah_esp_conn_schedule,
	223	.conn_in_get = ah_esp_conn_in_get,
	224	.conn_out_get = ah_esp_conn_out_get,
	225	.snat_handler = NULL,
	226	.dnat_handler = NULL,
	227	.csum_check = NULL,
	228	.state_transition = NULL,
	229	.register_app = NULL,
	230	.unregister_app = NULL,
	231	.app_conn_bind = NULL,
	232	.debug_packet = ah_esp_debug_packet,
	233	.timeout_change = NULL, /* ISAKMP */
	234	};
	235	#endif