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/*
* ip_vs_proto.c: transport protocol load balancing support for IPVS
*
* Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
* Julian Anastasov <ja@ssi.bg>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Changes:
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <net/protocol.h>
#include <net/tcp.h>
#include <net/udp.h>
#include <asm/system.h>
#include <linux/stat.h>
#include <linux/proc_fs.h>
#include <net/ip_vs.h>
/*
* IPVS protocols can only be registered/unregistered when the ipvs
* module is loaded/unloaded, so no lock is needed in accessing the
* ipvs protocol table.
*/
#define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
#define IP_VS_PROTO_HASH(proto) ((proto) & (IP_VS_PROTO_TAB_SIZE-1))
static struct ip_vs_protocol *ip_vs_proto_table[IP_VS_PROTO_TAB_SIZE];
/*
* register an ipvs protocol
*/
static int __used register_ip_vs_protocol(struct ip_vs_protocol *pp)
{
unsigned hash = IP_VS_PROTO_HASH(pp->protocol);
pp->next = ip_vs_proto_table[hash];
ip_vs_proto_table[hash] = pp;
if (pp->init != NULL)
pp->init(pp);
return 0;
}
/*
* unregister an ipvs protocol
*/
static int unregister_ip_vs_protocol(struct ip_vs_protocol *pp)
{
struct ip_vs_protocol **pp_p;
unsigned hash = IP_VS_PROTO_HASH(pp->protocol);
pp_p = &ip_vs_proto_table[hash];
for (; *pp_p; pp_p = &(*pp_p)->next) {
if (*pp_p == pp) {
*pp_p = pp->next;
if (pp->exit != NULL)
pp->exit(pp);
return 0;
}
}
return -ESRCH;
}
/*
* get ip_vs_protocol object by its proto.
*/
struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto)
{
struct ip_vs_protocol *pp;
unsigned hash = IP_VS_PROTO_HASH(proto);
for (pp = ip_vs_proto_table[hash]; pp; pp = pp->next) {
if (pp->protocol == proto)
return pp;
}
return NULL;
}
/*
* Propagate event for state change to all protocols
*/
void ip_vs_protocol_timeout_change(int flags)
{
struct ip_vs_protocol *pp;
int i;
for (i = 0; i < IP_VS_PROTO_TAB_SIZE; i++) {
for (pp = ip_vs_proto_table[i]; pp; pp = pp->next) {
if (pp->timeout_change)
pp->timeout_change(pp, flags);
}
}
}
int *
ip_vs_create_timeout_table(int *table, int size)
{
return kmemdup(table, size, GFP_ATOMIC);
}
/*
* Set timeout value for state specified by name
*/
int
ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to)
{
int i;
if (!table || !name || !to)
return -EINVAL;
for (i = 0; i < num; i++) {
if (strcmp(names[i], name))
continue;
table[i] = to * HZ;
return 0;
}
return -ENOENT;
}
const char * ip_vs_state_name(__u16 proto, int state)
{
struct ip_vs_protocol *pp = ip_vs_proto_get(proto);
if (pp == NULL || pp->state_name == NULL)
return (IPPROTO_IP == proto) ? "NONE" : "ERR!";
return pp->state_name(state);
}
void
ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp,
const struct sk_buff *skb,
int offset,
const char *msg)
{
char buf[128];
struct iphdr _iph, *ih;
ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
if (ih == NULL)
sprintf(buf, "%s TRUNCATED", pp->name);
else if (ih->frag_off & htons(IP_OFFSET))
sprintf(buf, "%s %u.%u.%u.%u->%u.%u.%u.%u frag",
pp->name, NIPQUAD(ih->saddr),
NIPQUAD(ih->daddr));
else {
__be16 _ports[2], *pptr
;
pptr = skb_header_pointer(skb, offset + ih->ihl*4,
sizeof(_ports), _ports);
if (pptr == NULL)
sprintf(buf, "%s TRUNCATED %u.%u.%u.%u->%u.%u.%u.%u",
pp->name,
NIPQUAD(ih->saddr),
NIPQUAD(ih->daddr));
else
sprintf(buf, "%s %u.%u.%u.%u:%u->%u.%u.%u.%u:%u",
pp->name,
NIPQUAD(ih->saddr),
ntohs(pptr[0]),
NIPQUAD(ih->daddr),
ntohs(pptr[1]));
}
printk(KERN_DEBUG "IPVS: %s: %s\n", msg, buf);
}
int ip_vs_protocol_init(void)
{
char protocols[64];
#define REGISTER_PROTOCOL(p) \
do { \
register_ip_vs_protocol(p); \
strcat(protocols, ", "); \
strcat(protocols, (p)->name); \
} while (0)
protocols[0] = '\0';
protocols[2] = '\0';
#ifdef CONFIG_IP_VS_PROTO_TCP
REGISTER_PROTOCOL(&ip_vs_protocol_tcp);
#endif
#ifdef CONFIG_IP_VS_PROTO_UDP
REGISTER_PROTOCOL(&ip_vs_protocol_udp);
#endif
#ifdef CONFIG_IP_VS_PROTO_AH
REGISTER_PROTOCOL(&ip_vs_protocol_ah);
#endif
#ifdef CONFIG_IP_VS_PROTO_ESP
REGISTER_PROTOCOL(&ip_vs_protocol_esp);
#endif
IP_VS_INFO("Registered protocols (%s)\n", &protocols[2]);
return 0;
}
void ip_vs_protocol_cleanup(void)
{
struct ip_vs_protocol *pp;
int i;
/* unregister all the ipvs protocols */
for (i = 0; i < IP_VS_PROTO_TAB_SIZE; i++) {
while ((pp = ip_vs_proto_table[i]) != NULL)
unregister_ip_vs_protocol(pp);
}
}
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