mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-10-19 09:59:04 +00:00
32292a7ff1
Fix section mismatch warnings caused by netfilter's init_or_cleanup functions used in many places by splitting the init from the cleanup parts. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
772 lines
19 KiB
C
772 lines
19 KiB
C
/* Cluster IP hashmark target
|
|
* (C) 2003-2004 by Harald Welte <laforge@netfilter.org>
|
|
* based on ideas of Fabio Olive Leite <olive@unixforge.org>
|
|
*
|
|
* Development of this code funded by SuSE Linux AG, http://www.suse.com/
|
|
*
|
|
* 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/config.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/jhash.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/ip.h>
|
|
#include <linux/tcp.h>
|
|
#include <linux/udp.h>
|
|
#include <linux/icmp.h>
|
|
#include <linux/if_arp.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/seq_file.h>
|
|
|
|
#include <net/checksum.h>
|
|
|
|
#include <linux/netfilter_arp.h>
|
|
|
|
#include <linux/netfilter_ipv4/ip_tables.h>
|
|
#include <linux/netfilter_ipv4/ipt_CLUSTERIP.h>
|
|
#include <net/netfilter/nf_conntrack_compat.h>
|
|
|
|
#define CLUSTERIP_VERSION "0.8"
|
|
|
|
#define DEBUG_CLUSTERIP
|
|
|
|
#ifdef DEBUG_CLUSTERIP
|
|
#define DEBUGP printk
|
|
#else
|
|
#define DEBUGP
|
|
#endif
|
|
|
|
#define ASSERT_READ_LOCK(x)
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
|
|
MODULE_DESCRIPTION("iptables target for CLUSTERIP");
|
|
|
|
struct clusterip_config {
|
|
struct list_head list; /* list of all configs */
|
|
atomic_t refcount; /* reference count */
|
|
atomic_t entries; /* number of entries/rules
|
|
* referencing us */
|
|
|
|
u_int32_t clusterip; /* the IP address */
|
|
u_int8_t clustermac[ETH_ALEN]; /* the MAC address */
|
|
struct net_device *dev; /* device */
|
|
u_int16_t num_total_nodes; /* total number of nodes */
|
|
unsigned long local_nodes; /* node number array */
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
struct proc_dir_entry *pde; /* proc dir entry */
|
|
#endif
|
|
enum clusterip_hashmode hash_mode; /* which hashing mode */
|
|
u_int32_t hash_initval; /* hash initialization */
|
|
};
|
|
|
|
static LIST_HEAD(clusterip_configs);
|
|
|
|
/* clusterip_lock protects the clusterip_configs list */
|
|
static DEFINE_RWLOCK(clusterip_lock);
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
static struct file_operations clusterip_proc_fops;
|
|
static struct proc_dir_entry *clusterip_procdir;
|
|
#endif
|
|
|
|
static inline void
|
|
clusterip_config_get(struct clusterip_config *c)
|
|
{
|
|
atomic_inc(&c->refcount);
|
|
}
|
|
|
|
static inline void
|
|
clusterip_config_put(struct clusterip_config *c)
|
|
{
|
|
if (atomic_dec_and_test(&c->refcount))
|
|
kfree(c);
|
|
}
|
|
|
|
/* increase the count of entries(rules) using/referencing this config */
|
|
static inline void
|
|
clusterip_config_entry_get(struct clusterip_config *c)
|
|
{
|
|
atomic_inc(&c->entries);
|
|
}
|
|
|
|
/* decrease the count of entries using/referencing this config. If last
|
|
* entry(rule) is removed, remove the config from lists, but don't free it
|
|
* yet, since proc-files could still be holding references */
|
|
static inline void
|
|
clusterip_config_entry_put(struct clusterip_config *c)
|
|
{
|
|
if (atomic_dec_and_test(&c->entries)) {
|
|
write_lock_bh(&clusterip_lock);
|
|
list_del(&c->list);
|
|
write_unlock_bh(&clusterip_lock);
|
|
|
|
dev_mc_delete(c->dev, c->clustermac, ETH_ALEN, 0);
|
|
dev_put(c->dev);
|
|
|
|
/* In case anyone still accesses the file, the open/close
|
|
* functions are also incrementing the refcount on their own,
|
|
* so it's safe to remove the entry even if it's in use. */
|
|
#ifdef CONFIG_PROC_FS
|
|
remove_proc_entry(c->pde->name, c->pde->parent);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
static struct clusterip_config *
|
|
__clusterip_config_find(u_int32_t clusterip)
|
|
{
|
|
struct list_head *pos;
|
|
|
|
ASSERT_READ_LOCK(&clusterip_lock);
|
|
list_for_each(pos, &clusterip_configs) {
|
|
struct clusterip_config *c = list_entry(pos,
|
|
struct clusterip_config, list);
|
|
if (c->clusterip == clusterip) {
|
|
return c;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct clusterip_config *
|
|
clusterip_config_find_get(u_int32_t clusterip, int entry)
|
|
{
|
|
struct clusterip_config *c;
|
|
|
|
read_lock_bh(&clusterip_lock);
|
|
c = __clusterip_config_find(clusterip);
|
|
if (!c) {
|
|
read_unlock_bh(&clusterip_lock);
|
|
return NULL;
|
|
}
|
|
atomic_inc(&c->refcount);
|
|
if (entry)
|
|
atomic_inc(&c->entries);
|
|
read_unlock_bh(&clusterip_lock);
|
|
|
|
return c;
|
|
}
|
|
|
|
static void
|
|
clusterip_config_init_nodelist(struct clusterip_config *c,
|
|
const struct ipt_clusterip_tgt_info *i)
|
|
{
|
|
int n;
|
|
|
|
for (n = 0; n < i->num_local_nodes; n++) {
|
|
set_bit(i->local_nodes[n] - 1, &c->local_nodes);
|
|
}
|
|
}
|
|
|
|
static struct clusterip_config *
|
|
clusterip_config_init(struct ipt_clusterip_tgt_info *i, u_int32_t ip,
|
|
struct net_device *dev)
|
|
{
|
|
struct clusterip_config *c;
|
|
char buffer[16];
|
|
|
|
c = kmalloc(sizeof(*c), GFP_ATOMIC);
|
|
if (!c)
|
|
return NULL;
|
|
|
|
memset(c, 0, sizeof(*c));
|
|
c->dev = dev;
|
|
c->clusterip = ip;
|
|
memcpy(&c->clustermac, &i->clustermac, ETH_ALEN);
|
|
c->num_total_nodes = i->num_total_nodes;
|
|
clusterip_config_init_nodelist(c, i);
|
|
c->hash_mode = i->hash_mode;
|
|
c->hash_initval = i->hash_initval;
|
|
atomic_set(&c->refcount, 1);
|
|
atomic_set(&c->entries, 1);
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
/* create proc dir entry */
|
|
sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(ip));
|
|
c->pde = create_proc_entry(buffer, S_IWUSR|S_IRUSR, clusterip_procdir);
|
|
if (!c->pde) {
|
|
kfree(c);
|
|
return NULL;
|
|
}
|
|
c->pde->proc_fops = &clusterip_proc_fops;
|
|
c->pde->data = c;
|
|
#endif
|
|
|
|
write_lock_bh(&clusterip_lock);
|
|
list_add(&c->list, &clusterip_configs);
|
|
write_unlock_bh(&clusterip_lock);
|
|
|
|
return c;
|
|
}
|
|
|
|
static int
|
|
clusterip_add_node(struct clusterip_config *c, u_int16_t nodenum)
|
|
{
|
|
|
|
if (nodenum == 0 ||
|
|
nodenum > c->num_total_nodes)
|
|
return 1;
|
|
|
|
/* check if we already have this number in our bitfield */
|
|
if (test_and_set_bit(nodenum - 1, &c->local_nodes))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
clusterip_del_node(struct clusterip_config *c, u_int16_t nodenum)
|
|
{
|
|
if (nodenum == 0 ||
|
|
nodenum > c->num_total_nodes)
|
|
return 1;
|
|
|
|
if (test_and_clear_bit(nodenum - 1, &c->local_nodes))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static inline u_int32_t
|
|
clusterip_hashfn(struct sk_buff *skb, struct clusterip_config *config)
|
|
{
|
|
struct iphdr *iph = skb->nh.iph;
|
|
unsigned long hashval;
|
|
u_int16_t sport, dport;
|
|
struct tcphdr *th;
|
|
struct udphdr *uh;
|
|
struct icmphdr *ih;
|
|
|
|
switch (iph->protocol) {
|
|
case IPPROTO_TCP:
|
|
th = (void *)iph+iph->ihl*4;
|
|
sport = ntohs(th->source);
|
|
dport = ntohs(th->dest);
|
|
break;
|
|
case IPPROTO_UDP:
|
|
uh = (void *)iph+iph->ihl*4;
|
|
sport = ntohs(uh->source);
|
|
dport = ntohs(uh->dest);
|
|
break;
|
|
case IPPROTO_ICMP:
|
|
ih = (void *)iph+iph->ihl*4;
|
|
sport = ntohs(ih->un.echo.id);
|
|
dport = (ih->type<<8)|ih->code;
|
|
break;
|
|
default:
|
|
if (net_ratelimit()) {
|
|
printk(KERN_NOTICE "CLUSTERIP: unknown protocol `%u'\n",
|
|
iph->protocol);
|
|
}
|
|
sport = dport = 0;
|
|
}
|
|
|
|
switch (config->hash_mode) {
|
|
case CLUSTERIP_HASHMODE_SIP:
|
|
hashval = jhash_1word(ntohl(iph->saddr),
|
|
config->hash_initval);
|
|
break;
|
|
case CLUSTERIP_HASHMODE_SIP_SPT:
|
|
hashval = jhash_2words(ntohl(iph->saddr), sport,
|
|
config->hash_initval);
|
|
break;
|
|
case CLUSTERIP_HASHMODE_SIP_SPT_DPT:
|
|
hashval = jhash_3words(ntohl(iph->saddr), sport, dport,
|
|
config->hash_initval);
|
|
break;
|
|
default:
|
|
/* to make gcc happy */
|
|
hashval = 0;
|
|
/* This cannot happen, unless the check function wasn't called
|
|
* at rule load time */
|
|
printk("CLUSTERIP: unknown mode `%u'\n", config->hash_mode);
|
|
BUG();
|
|
break;
|
|
}
|
|
|
|
/* node numbers are 1..n, not 0..n */
|
|
return ((hashval % config->num_total_nodes)+1);
|
|
}
|
|
|
|
static inline int
|
|
clusterip_responsible(struct clusterip_config *config, u_int32_t hash)
|
|
{
|
|
return test_bit(hash - 1, &config->local_nodes);
|
|
}
|
|
|
|
/***********************************************************************
|
|
* IPTABLES TARGET
|
|
***********************************************************************/
|
|
|
|
static unsigned int
|
|
target(struct sk_buff **pskb,
|
|
const struct net_device *in,
|
|
const struct net_device *out,
|
|
unsigned int hooknum,
|
|
const struct xt_target *target,
|
|
const void *targinfo,
|
|
void *userinfo)
|
|
{
|
|
const struct ipt_clusterip_tgt_info *cipinfo = targinfo;
|
|
enum ip_conntrack_info ctinfo;
|
|
u_int32_t *mark, hash;
|
|
|
|
/* don't need to clusterip_config_get() here, since refcount
|
|
* is only decremented by destroy() - and ip_tables guarantees
|
|
* that the ->target() function isn't called after ->destroy() */
|
|
|
|
mark = nf_ct_get_mark((*pskb), &ctinfo);
|
|
if (mark == NULL) {
|
|
printk(KERN_ERR "CLUSTERIP: no conntrack!\n");
|
|
/* FIXME: need to drop invalid ones, since replies
|
|
* to outgoing connections of other nodes will be
|
|
* marked as INVALID */
|
|
return NF_DROP;
|
|
}
|
|
|
|
/* special case: ICMP error handling. conntrack distinguishes between
|
|
* error messages (RELATED) and information requests (see below) */
|
|
if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP
|
|
&& (ctinfo == IP_CT_RELATED
|
|
|| ctinfo == IP_CT_RELATED+IP_CT_IS_REPLY))
|
|
return IPT_CONTINUE;
|
|
|
|
/* ip_conntrack_icmp guarantees us that we only have ICMP_ECHO,
|
|
* TIMESTAMP, INFO_REQUEST or ADDRESS type icmp packets from here
|
|
* on, which all have an ID field [relevant for hashing]. */
|
|
|
|
hash = clusterip_hashfn(*pskb, cipinfo->config);
|
|
|
|
switch (ctinfo) {
|
|
case IP_CT_NEW:
|
|
*mark = hash;
|
|
break;
|
|
case IP_CT_RELATED:
|
|
case IP_CT_RELATED+IP_CT_IS_REPLY:
|
|
/* FIXME: we don't handle expectations at the
|
|
* moment. they can arrive on a different node than
|
|
* the master connection (e.g. FTP passive mode) */
|
|
case IP_CT_ESTABLISHED:
|
|
case IP_CT_ESTABLISHED+IP_CT_IS_REPLY:
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
#ifdef DEBUG_CLUSTERP
|
|
DUMP_TUPLE(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
|
|
#endif
|
|
DEBUGP("hash=%u ct_hash=%u ", hash, *mark);
|
|
if (!clusterip_responsible(cipinfo->config, hash)) {
|
|
DEBUGP("not responsible\n");
|
|
return NF_DROP;
|
|
}
|
|
DEBUGP("responsible\n");
|
|
|
|
/* despite being received via linklayer multicast, this is
|
|
* actually a unicast IP packet. TCP doesn't like PACKET_MULTICAST */
|
|
(*pskb)->pkt_type = PACKET_HOST;
|
|
|
|
return IPT_CONTINUE;
|
|
}
|
|
|
|
static int
|
|
checkentry(const char *tablename,
|
|
const void *e_void,
|
|
const struct xt_target *target,
|
|
void *targinfo,
|
|
unsigned int targinfosize,
|
|
unsigned int hook_mask)
|
|
{
|
|
struct ipt_clusterip_tgt_info *cipinfo = targinfo;
|
|
const struct ipt_entry *e = e_void;
|
|
|
|
struct clusterip_config *config;
|
|
|
|
if (cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP &&
|
|
cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT &&
|
|
cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT_DPT) {
|
|
printk(KERN_WARNING "CLUSTERIP: unknown mode `%u'\n",
|
|
cipinfo->hash_mode);
|
|
return 0;
|
|
|
|
}
|
|
if (e->ip.dmsk.s_addr != 0xffffffff
|
|
|| e->ip.dst.s_addr == 0) {
|
|
printk(KERN_ERR "CLUSTERIP: Please specify destination IP\n");
|
|
return 0;
|
|
}
|
|
|
|
/* FIXME: further sanity checks */
|
|
|
|
config = clusterip_config_find_get(e->ip.dst.s_addr, 1);
|
|
if (config) {
|
|
if (cipinfo->config != NULL) {
|
|
/* Case A: This is an entry that gets reloaded, since
|
|
* it still has a cipinfo->config pointer. Simply
|
|
* increase the entry refcount and return */
|
|
if (cipinfo->config != config) {
|
|
printk(KERN_ERR "CLUSTERIP: Reloaded entry "
|
|
"has invalid config pointer!\n");
|
|
return 0;
|
|
}
|
|
clusterip_config_entry_get(cipinfo->config);
|
|
} else {
|
|
/* Case B: This is a new rule referring to an existing
|
|
* clusterip config. */
|
|
cipinfo->config = config;
|
|
clusterip_config_entry_get(cipinfo->config);
|
|
}
|
|
} else {
|
|
/* Case C: This is a completely new clusterip config */
|
|
if (!(cipinfo->flags & CLUSTERIP_FLAG_NEW)) {
|
|
printk(KERN_WARNING "CLUSTERIP: no config found for %u.%u.%u.%u, need 'new'\n", NIPQUAD(e->ip.dst.s_addr));
|
|
return 0;
|
|
} else {
|
|
struct net_device *dev;
|
|
|
|
if (e->ip.iniface[0] == '\0') {
|
|
printk(KERN_WARNING "CLUSTERIP: Please specify an interface name\n");
|
|
return 0;
|
|
}
|
|
|
|
dev = dev_get_by_name(e->ip.iniface);
|
|
if (!dev) {
|
|
printk(KERN_WARNING "CLUSTERIP: no such interface %s\n", e->ip.iniface);
|
|
return 0;
|
|
}
|
|
|
|
config = clusterip_config_init(cipinfo,
|
|
e->ip.dst.s_addr, dev);
|
|
if (!config) {
|
|
printk(KERN_WARNING "CLUSTERIP: cannot allocate config\n");
|
|
dev_put(dev);
|
|
return 0;
|
|
}
|
|
dev_mc_add(config->dev,config->clustermac, ETH_ALEN, 0);
|
|
}
|
|
cipinfo->config = config;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* drop reference count of cluster config when rule is deleted */
|
|
static void destroy(const struct xt_target *target, void *targinfo,
|
|
unsigned int targinfosize)
|
|
{
|
|
struct ipt_clusterip_tgt_info *cipinfo = targinfo;
|
|
|
|
/* if no more entries are referencing the config, remove it
|
|
* from the list and destroy the proc entry */
|
|
clusterip_config_entry_put(cipinfo->config);
|
|
|
|
clusterip_config_put(cipinfo->config);
|
|
}
|
|
|
|
static struct ipt_target clusterip_tgt = {
|
|
.name = "CLUSTERIP",
|
|
.target = target,
|
|
.targetsize = sizeof(struct ipt_clusterip_tgt_info),
|
|
.checkentry = checkentry,
|
|
.destroy = destroy,
|
|
.me = THIS_MODULE
|
|
};
|
|
|
|
|
|
/***********************************************************************
|
|
* ARP MANGLING CODE
|
|
***********************************************************************/
|
|
|
|
/* hardcoded for 48bit ethernet and 32bit ipv4 addresses */
|
|
struct arp_payload {
|
|
u_int8_t src_hw[ETH_ALEN];
|
|
u_int32_t src_ip;
|
|
u_int8_t dst_hw[ETH_ALEN];
|
|
u_int32_t dst_ip;
|
|
} __attribute__ ((packed));
|
|
|
|
#ifdef CLUSTERIP_DEBUG
|
|
static void arp_print(struct arp_payload *payload)
|
|
{
|
|
#define HBUFFERLEN 30
|
|
char hbuffer[HBUFFERLEN];
|
|
int j,k;
|
|
const char hexbuf[]= "0123456789abcdef";
|
|
|
|
for (k=0, j=0; k < HBUFFERLEN-3 && j < ETH_ALEN; j++) {
|
|
hbuffer[k++]=hexbuf[(payload->src_hw[j]>>4)&15];
|
|
hbuffer[k++]=hexbuf[payload->src_hw[j]&15];
|
|
hbuffer[k++]=':';
|
|
}
|
|
hbuffer[--k]='\0';
|
|
|
|
printk("src %u.%u.%u.%u@%s, dst %u.%u.%u.%u\n",
|
|
NIPQUAD(payload->src_ip), hbuffer,
|
|
NIPQUAD(payload->dst_ip));
|
|
}
|
|
#endif
|
|
|
|
static unsigned int
|
|
arp_mangle(unsigned int hook,
|
|
struct sk_buff **pskb,
|
|
const struct net_device *in,
|
|
const struct net_device *out,
|
|
int (*okfn)(struct sk_buff *))
|
|
{
|
|
struct arphdr *arp = (*pskb)->nh.arph;
|
|
struct arp_payload *payload;
|
|
struct clusterip_config *c;
|
|
|
|
/* we don't care about non-ethernet and non-ipv4 ARP */
|
|
if (arp->ar_hrd != htons(ARPHRD_ETHER)
|
|
|| arp->ar_pro != htons(ETH_P_IP)
|
|
|| arp->ar_pln != 4 || arp->ar_hln != ETH_ALEN)
|
|
return NF_ACCEPT;
|
|
|
|
/* we only want to mangle arp requests and replies */
|
|
if (arp->ar_op != htons(ARPOP_REPLY)
|
|
&& arp->ar_op != htons(ARPOP_REQUEST))
|
|
return NF_ACCEPT;
|
|
|
|
payload = (void *)(arp+1);
|
|
|
|
/* if there is no clusterip configuration for the arp reply's
|
|
* source ip, we don't want to mangle it */
|
|
c = clusterip_config_find_get(payload->src_ip, 0);
|
|
if (!c)
|
|
return NF_ACCEPT;
|
|
|
|
/* normally the linux kernel always replies to arp queries of
|
|
* addresses on different interfacs. However, in the CLUSTERIP case
|
|
* this wouldn't work, since we didn't subscribe the mcast group on
|
|
* other interfaces */
|
|
if (c->dev != out) {
|
|
DEBUGP("CLUSTERIP: not mangling arp reply on different "
|
|
"interface: cip'%s'-skb'%s'\n", c->dev->name, out->name);
|
|
clusterip_config_put(c);
|
|
return NF_ACCEPT;
|
|
}
|
|
|
|
/* mangle reply hardware address */
|
|
memcpy(payload->src_hw, c->clustermac, arp->ar_hln);
|
|
|
|
#ifdef CLUSTERIP_DEBUG
|
|
DEBUGP(KERN_DEBUG "CLUSTERIP mangled arp reply: ");
|
|
arp_print(payload);
|
|
#endif
|
|
|
|
clusterip_config_put(c);
|
|
|
|
return NF_ACCEPT;
|
|
}
|
|
|
|
static struct nf_hook_ops cip_arp_ops = {
|
|
.hook = arp_mangle,
|
|
.pf = NF_ARP,
|
|
.hooknum = NF_ARP_OUT,
|
|
.priority = -1
|
|
};
|
|
|
|
/***********************************************************************
|
|
* PROC DIR HANDLING
|
|
***********************************************************************/
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
struct clusterip_seq_position {
|
|
unsigned int pos; /* position */
|
|
unsigned int weight; /* number of bits set == size */
|
|
unsigned int bit; /* current bit */
|
|
unsigned long val; /* current value */
|
|
};
|
|
|
|
static void *clusterip_seq_start(struct seq_file *s, loff_t *pos)
|
|
{
|
|
struct proc_dir_entry *pde = s->private;
|
|
struct clusterip_config *c = pde->data;
|
|
unsigned int weight;
|
|
u_int32_t local_nodes;
|
|
struct clusterip_seq_position *idx;
|
|
|
|
/* FIXME: possible race */
|
|
local_nodes = c->local_nodes;
|
|
weight = hweight32(local_nodes);
|
|
if (*pos >= weight)
|
|
return NULL;
|
|
|
|
idx = kmalloc(sizeof(struct clusterip_seq_position), GFP_KERNEL);
|
|
if (!idx)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
idx->pos = *pos;
|
|
idx->weight = weight;
|
|
idx->bit = ffs(local_nodes);
|
|
idx->val = local_nodes;
|
|
clear_bit(idx->bit - 1, &idx->val);
|
|
|
|
return idx;
|
|
}
|
|
|
|
static void *clusterip_seq_next(struct seq_file *s, void *v, loff_t *pos)
|
|
{
|
|
struct clusterip_seq_position *idx = (struct clusterip_seq_position *)v;
|
|
|
|
*pos = ++idx->pos;
|
|
if (*pos >= idx->weight) {
|
|
kfree(v);
|
|
return NULL;
|
|
}
|
|
idx->bit = ffs(idx->val);
|
|
clear_bit(idx->bit - 1, &idx->val);
|
|
return idx;
|
|
}
|
|
|
|
static void clusterip_seq_stop(struct seq_file *s, void *v)
|
|
{
|
|
kfree(v);
|
|
}
|
|
|
|
static int clusterip_seq_show(struct seq_file *s, void *v)
|
|
{
|
|
struct clusterip_seq_position *idx = (struct clusterip_seq_position *)v;
|
|
|
|
if (idx->pos != 0)
|
|
seq_putc(s, ',');
|
|
|
|
seq_printf(s, "%u", idx->bit);
|
|
|
|
if (idx->pos == idx->weight - 1)
|
|
seq_putc(s, '\n');
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct seq_operations clusterip_seq_ops = {
|
|
.start = clusterip_seq_start,
|
|
.next = clusterip_seq_next,
|
|
.stop = clusterip_seq_stop,
|
|
.show = clusterip_seq_show,
|
|
};
|
|
|
|
static int clusterip_proc_open(struct inode *inode, struct file *file)
|
|
{
|
|
int ret = seq_open(file, &clusterip_seq_ops);
|
|
|
|
if (!ret) {
|
|
struct seq_file *sf = file->private_data;
|
|
struct proc_dir_entry *pde = PDE(inode);
|
|
struct clusterip_config *c = pde->data;
|
|
|
|
sf->private = pde;
|
|
|
|
clusterip_config_get(c);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int clusterip_proc_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct proc_dir_entry *pde = PDE(inode);
|
|
struct clusterip_config *c = pde->data;
|
|
int ret;
|
|
|
|
ret = seq_release(inode, file);
|
|
|
|
if (!ret)
|
|
clusterip_config_put(c);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t clusterip_proc_write(struct file *file, const char __user *input,
|
|
size_t size, loff_t *ofs)
|
|
{
|
|
#define PROC_WRITELEN 10
|
|
char buffer[PROC_WRITELEN+1];
|
|
struct proc_dir_entry *pde = PDE(file->f_dentry->d_inode);
|
|
struct clusterip_config *c = pde->data;
|
|
unsigned long nodenum;
|
|
|
|
if (copy_from_user(buffer, input, PROC_WRITELEN))
|
|
return -EFAULT;
|
|
|
|
if (*buffer == '+') {
|
|
nodenum = simple_strtoul(buffer+1, NULL, 10);
|
|
if (clusterip_add_node(c, nodenum))
|
|
return -ENOMEM;
|
|
} else if (*buffer == '-') {
|
|
nodenum = simple_strtoul(buffer+1, NULL,10);
|
|
if (clusterip_del_node(c, nodenum))
|
|
return -ENOENT;
|
|
} else
|
|
return -EIO;
|
|
|
|
return size;
|
|
}
|
|
|
|
static struct file_operations clusterip_proc_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = clusterip_proc_open,
|
|
.read = seq_read,
|
|
.write = clusterip_proc_write,
|
|
.llseek = seq_lseek,
|
|
.release = clusterip_proc_release,
|
|
};
|
|
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
static int __init ipt_clusterip_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = ipt_register_target(&clusterip_tgt);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = nf_register_hook(&cip_arp_ops);
|
|
if (ret < 0)
|
|
goto cleanup_target;
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
clusterip_procdir = proc_mkdir("ipt_CLUSTERIP", proc_net);
|
|
if (!clusterip_procdir) {
|
|
printk(KERN_ERR "CLUSTERIP: Unable to proc dir entry\n");
|
|
ret = -ENOMEM;
|
|
goto cleanup_hook;
|
|
}
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
printk(KERN_NOTICE "ClusterIP Version %s loaded successfully\n",
|
|
CLUSTERIP_VERSION);
|
|
return 0;
|
|
|
|
cleanup_hook:
|
|
nf_unregister_hook(&cip_arp_ops);
|
|
cleanup_target:
|
|
ipt_unregister_target(&clusterip_tgt);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit ipt_clusterip_fini(void)
|
|
{
|
|
printk(KERN_NOTICE "ClusterIP Version %s unloading\n",
|
|
CLUSTERIP_VERSION);
|
|
#ifdef CONFIG_PROC_FS
|
|
remove_proc_entry(clusterip_procdir->name, clusterip_procdir->parent);
|
|
#endif
|
|
nf_unregister_hook(&cip_arp_ops);
|
|
ipt_unregister_target(&clusterip_tgt);
|
|
}
|
|
|
|
module_init(ipt_clusterip_init);
|
|
module_exit(ipt_clusterip_fini);
|