Marked as 'to be removed soon' since kernel 4.1 (2015).
Functionality was superseded by the 'cluster' match, added in kernel
2.6.30 (2009).
clusterip_tg_check still has races that can give
proc_dir_entry 'ipt_CLUSTERIP/10.1.1.2' already registered
followed by a WARN splat.
Remove it instead of trying to fix this up again,
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
---
.../uapi/linux/netfilter_ipv4/ipt_CLUSTERIP.h | 38 -
net/ipv4/netfilter/Kconfig | 14 -
net/ipv4/netfilter/Makefile | 1 -
net/ipv4/netfilter/ipt_CLUSTERIP.c | 929 ------------------
4 files changed, 982 deletions(-)
delete mode 100644 include/uapi/linux/netfilter_ipv4/ipt_CLUSTERIP.h
delete mode 100644 net/ipv4/netfilter/ipt_CLUSTERIP.c
diff --git a/include/uapi/linux/netfilter_ipv4/ipt_CLUSTERIP.h b/include/uapi/linux/netfilter_ipv4/ipt_CLUSTERIP.h
deleted file mode 100644
index ff6599494fe6..000000000000
--- a/include/uapi/linux/netfilter_ipv4/ipt_CLUSTERIP.h
+++ /dev/null
@@ -1,38 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-#ifndef _IPT_CLUSTERIP_H_target
-#define _IPT_CLUSTERIP_H_target
-
-#include <linux/types.h>
-#include <linux/if_ether.h>
-
-enum clusterip_hashmode {
- CLUSTERIP_HASHMODE_SIP = 0,
- CLUSTERIP_HASHMODE_SIP_SPT,
- CLUSTERIP_HASHMODE_SIP_SPT_DPT,
-};
-
-#define CLUSTERIP_HASHMODE_MAX CLUSTERIP_HASHMODE_SIP_SPT_DPT
-
-#define CLUSTERIP_MAX_NODES 16
-
-#define CLUSTERIP_FLAG_NEW 0x00000001
-
-struct clusterip_config;
-
-struct ipt_clusterip_tgt_info {
-
- __u32 flags;
-
- /* only relevant for new ones */
- __u8 clustermac[ETH_ALEN];
- __u16 num_total_nodes;
- __u16 num_local_nodes;
- __u16 local_nodes[CLUSTERIP_MAX_NODES];
- __u32 hash_mode;
- __u32 hash_initval;
-
- /* Used internally by the kernel */
- struct clusterip_config *config;
-};
-
-#endif /*_IPT_CLUSTERIP_H_target*/
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index aab384126f61..f71a7e9a7de6 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -259,20 +259,6 @@ config IP_NF_MANGLE
To compile it as a module, choose M here. If unsure, say N.
-config IP_NF_TARGET_CLUSTERIP
- tristate "CLUSTERIP target support"
- depends on IP_NF_MANGLE
- depends on NF_CONNTRACK
- depends on NETFILTER_ADVANCED
- select NF_CONNTRACK_MARK
- select NETFILTER_FAMILY_ARP
- help
- The CLUSTERIP target allows you to build load-balancing clusters of
- network servers without having a dedicated load-balancing
- router/server/switch.
-
- To compile it as a module, choose M here. If unsure, say N.
-
config IP_NF_TARGET_ECN
tristate "ECN target support"
depends on IP_NF_MANGLE
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 93bad1184251..5a26f9de1ab9 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -39,7 +39,6 @@ obj-$(CONFIG_IP_NF_MATCH_AH) += ipt_ah.o
obj-$(CONFIG_IP_NF_MATCH_RPFILTER) += ipt_rpfilter.o
# targets
-obj-$(CONFIG_IP_NF_TARGET_CLUSTERIP) += ipt_CLUSTERIP.o
obj-$(CONFIG_IP_NF_TARGET_ECN) += ipt_ECN.o
obj-$(CONFIG_IP_NF_TARGET_REJECT) += ipt_REJECT.o
obj-$(CONFIG_IP_NF_TARGET_SYNPROXY) += ipt_SYNPROXY.o
diff --git a/net/ipv4/netfilter/ipt_CLUSTERIP.c b/net/ipv4/netfilter/ipt_CLUSTERIP.c
deleted file mode 100644
index b3cc416ed292..000000000000
--- a/net/ipv4/netfilter/ipt_CLUSTERIP.c
+++ /dev/null
@@ -1,929 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/* Cluster IP hashmark target
- * (C) 2003-2004 by Harald Welte <laforge@xxxxxxxxxxxxx>
- * based on ideas of Fabio Olive Leite <olive@xxxxxxxxxxxxx>
- *
- * Development of this code funded by SuSE Linux AG, https://www.suse.com/
- */
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/module.h>
-#include <linux/proc_fs.h>
-#include <linux/jhash.h>
-#include <linux/bitops.h>
-#include <linux/skbuff.h>
-#include <linux/slab.h>
-#include <linux/ip.h>
-#include <linux/tcp.h>
-#include <linux/udp.h>
-#include <linux/icmp.h>
-#include <linux/if_arp.h>
-#include <linux/seq_file.h>
-#include <linux/refcount.h>
-#include <linux/netfilter_arp.h>
-#include <linux/netfilter/x_tables.h>
-#include <linux/netfilter_ipv4/ip_tables.h>
-#include <linux/netfilter_ipv4/ipt_CLUSTERIP.h>
-#include <net/netfilter/nf_conntrack.h>
-#include <net/net_namespace.h>
-#include <net/netns/generic.h>
-#include <net/checksum.h>
-#include <net/ip.h>
-
-#define CLUSTERIP_VERSION "0.8"
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Harald Welte <laforge@xxxxxxxxxxxxx>");
-MODULE_DESCRIPTION("Xtables: CLUSTERIP target");
-
-struct clusterip_config {
- struct list_head list; /* list of all configs */
- refcount_t refcount; /* reference count */
- refcount_t entries; /* number of entries/rules
- * referencing us */
-
- __be32 clusterip; /* the IP address */
- u_int8_t clustermac[ETH_ALEN]; /* the MAC address */
- int ifindex; /* device ifindex */
- 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 */
- struct rcu_head rcu; /* for call_rcu */
- struct net *net; /* netns for pernet list */
- char ifname[IFNAMSIZ]; /* device ifname */
-};
-
-#ifdef CONFIG_PROC_FS
-static const struct proc_ops clusterip_proc_ops;
-#endif
-
-struct clusterip_net {
- struct list_head configs;
- /* lock protects the configs list */
- spinlock_t lock;
-
- bool clusterip_deprecated_warning;
-#ifdef CONFIG_PROC_FS
- struct proc_dir_entry *procdir;
- /* mutex protects the config->pde*/
- struct mutex mutex;
-#endif
- unsigned int hook_users;
-};
-
-static unsigned int clusterip_arp_mangle(void *priv, struct sk_buff *skb, const struct nf_hook_state *state);
-
-static const struct nf_hook_ops cip_arp_ops = {
- .hook = clusterip_arp_mangle,
- .pf = NFPROTO_ARP,
- .hooknum = NF_ARP_OUT,
- .priority = -1
-};
-
-static unsigned int clusterip_net_id __read_mostly;
-static inline struct clusterip_net *clusterip_pernet(struct net *net)
-{
- return net_generic(net, clusterip_net_id);
-}
-
-static inline void
-clusterip_config_get(struct clusterip_config *c)
-{
- refcount_inc(&c->refcount);
-}
-
-static void clusterip_config_rcu_free(struct rcu_head *head)
-{
- struct clusterip_config *config;
- struct net_device *dev;
-
- config = container_of(head, struct clusterip_config, rcu);
- dev = dev_get_by_name(config->net, config->ifname);
- if (dev) {
- dev_mc_del(dev, config->clustermac);
- dev_put(dev);
- }
- kfree(config);
-}
-
-static inline void
-clusterip_config_put(struct clusterip_config *c)
-{
- if (refcount_dec_and_test(&c->refcount))
- call_rcu(&c->rcu, clusterip_config_rcu_free);
-}
-
-/* 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)
-{
- struct clusterip_net *cn = clusterip_pernet(c->net);
-
- local_bh_disable();
- if (refcount_dec_and_lock(&c->entries, &cn->lock)) {
- list_del_rcu(&c->list);
- spin_unlock(&cn->lock);
- local_bh_enable();
- /* 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
- mutex_lock(&cn->mutex);
- if (cn->procdir)
- proc_remove(c->pde);
- mutex_unlock(&cn->mutex);
-#endif
- return;
- }
- local_bh_enable();
-}
-
-static struct clusterip_config *
-__clusterip_config_find(struct net *net, __be32 clusterip)
-{
- struct clusterip_config *c;
- struct clusterip_net *cn = clusterip_pernet(net);
-
- list_for_each_entry_rcu(c, &cn->configs, list) {
- if (c->clusterip == clusterip)
- return c;
- }
-
- return NULL;
-}
-
-static inline struct clusterip_config *
-clusterip_config_find_get(struct net *net, __be32 clusterip, int entry)
-{
- struct clusterip_config *c;
-
- rcu_read_lock_bh();
- c = __clusterip_config_find(net, clusterip);
- if (c) {
-#ifdef CONFIG_PROC_FS
- if (!c->pde)
- c = NULL;
- else
-#endif
- if (unlikely(!refcount_inc_not_zero(&c->refcount)))
- c = NULL;
- else if (entry) {
- if (unlikely(!refcount_inc_not_zero(&c->entries))) {
- clusterip_config_put(c);
- c = NULL;
- }
- }
- }
- rcu_read_unlock_bh();
-
- 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 int
-clusterip_netdev_event(struct notifier_block *this, unsigned long event,
- void *ptr)
-{
- struct net_device *dev = netdev_notifier_info_to_dev(ptr);
- struct net *net = dev_net(dev);
- struct clusterip_net *cn = clusterip_pernet(net);
- struct clusterip_config *c;
-
- spin_lock_bh(&cn->lock);
- list_for_each_entry_rcu(c, &cn->configs, list) {
- switch (event) {
- case NETDEV_REGISTER:
- if (!strcmp(dev->name, c->ifname)) {
- c->ifindex = dev->ifindex;
- dev_mc_add(dev, c->clustermac);
- }
- break;
- case NETDEV_UNREGISTER:
- if (dev->ifindex == c->ifindex) {
- dev_mc_del(dev, c->clustermac);
- c->ifindex = -1;
- }
- break;
- case NETDEV_CHANGENAME:
- if (!strcmp(dev->name, c->ifname)) {
- c->ifindex = dev->ifindex;
- dev_mc_add(dev, c->clustermac);
- } else if (dev->ifindex == c->ifindex) {
- dev_mc_del(dev, c->clustermac);
- c->ifindex = -1;
- }
- break;
- }
- }
- spin_unlock_bh(&cn->lock);
-
- return NOTIFY_DONE;
-}
-
-static struct clusterip_config *
-clusterip_config_init(struct net *net, const struct ipt_clusterip_tgt_info *i,
- __be32 ip, const char *iniface)
-{
- struct clusterip_net *cn = clusterip_pernet(net);
- struct clusterip_config *c;
- struct net_device *dev;
- int err;
-
- if (iniface[0] == '\0') {
- pr_info("Please specify an interface name\n");
- return ERR_PTR(-EINVAL);
- }
-
- c = kzalloc(sizeof(*c), GFP_ATOMIC);
- if (!c)
- return ERR_PTR(-ENOMEM);
-
- dev = dev_get_by_name(net, iniface);
- if (!dev) {
- pr_info("no such interface %s\n", iniface);
- kfree(c);
- return ERR_PTR(-ENOENT);
- }
- c->ifindex = dev->ifindex;
- strcpy(c->ifname, dev->name);
- memcpy(&c->clustermac, &i->clustermac, ETH_ALEN);
- dev_mc_add(dev, c->clustermac);
- dev_put(dev);
-
- c->clusterip = ip;
- 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;
- c->net = net;
- refcount_set(&c->refcount, 1);
-
- spin_lock_bh(&cn->lock);
- if (__clusterip_config_find(net, ip)) {
- err = -EBUSY;
- goto out_config_put;
- }
-
- list_add_rcu(&c->list, &cn->configs);
- spin_unlock_bh(&cn->lock);
-
-#ifdef CONFIG_PROC_FS
- {
- char buffer[16];
-
- /* create proc dir entry */
- sprintf(buffer, "%pI4", &ip);
- mutex_lock(&cn->mutex);
- c->pde = proc_create_data(buffer, 0600,
- cn->procdir,
- &clusterip_proc_ops, c);
- mutex_unlock(&cn->mutex);
- if (!c->pde) {
- err = -ENOMEM;
- goto err;
- }
- }
-#endif
-
- refcount_set(&c->entries, 1);
- return c;
-
-#ifdef CONFIG_PROC_FS
-err:
-#endif
- spin_lock_bh(&cn->lock);
- list_del_rcu(&c->list);
-out_config_put:
- spin_unlock_bh(&cn->lock);
- clusterip_config_put(c);
- return ERR_PTR(err);
-}
-
-#ifdef CONFIG_PROC_FS
-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 bool
-clusterip_del_node(struct clusterip_config *c, u_int16_t nodenum)
-{
- if (nodenum == 0 ||
- nodenum > c->num_total_nodes)
- return true;
-
- if (test_and_clear_bit(nodenum - 1, &c->local_nodes))
- return false;
-
- return true;
-}
-#endif
-
-static inline u_int32_t
-clusterip_hashfn(const struct sk_buff *skb,
- const struct clusterip_config *config)
-{
- const struct iphdr *iph = ip_hdr(skb);
- unsigned long hashval;
- u_int16_t sport = 0, dport = 0;
- int poff;
-
- poff = proto_ports_offset(iph->protocol);
- if (poff >= 0) {
- const u_int16_t *ports;
- u16 _ports[2];
-
- ports = skb_header_pointer(skb, iph->ihl * 4 + poff, 4, _ports);
- if (ports) {
- sport = ports[0];
- dport = ports[1];
- }
- } else {
- net_info_ratelimited("unknown protocol %u\n", iph->protocol);
- }
-
- 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 */
- pr_info("unknown mode %u\n", config->hash_mode);
- BUG();
- break;
- }
-
- /* node numbers are 1..n, not 0..n */
- return reciprocal_scale(hashval, config->num_total_nodes) + 1;
-}
-
-static inline int
-clusterip_responsible(const struct clusterip_config *config, u_int32_t hash)
-{
- return test_bit(hash - 1, &config->local_nodes);
-}
-
-/***********************************************************************
- * IPTABLES TARGET
- ***********************************************************************/
-
-static unsigned int
-clusterip_tg(struct sk_buff *skb, const struct xt_action_param *par)
-{
- const struct ipt_clusterip_tgt_info *cipinfo = par->targinfo;
- struct nf_conn *ct;
- enum ip_conntrack_info ctinfo;
- u_int32_t 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() */
-
- ct = nf_ct_get(skb, &ctinfo);
- if (ct == NULL)
- return NF_DROP;
-
- /* special case: ICMP error handling. conntrack distinguishes between
- * error messages (RELATED) and information requests (see below) */
- if (ip_hdr(skb)->protocol == IPPROTO_ICMP &&
- (ctinfo == IP_CT_RELATED ||
- ctinfo == IP_CT_RELATED_REPLY))
- return XT_CONTINUE;
-
- /* nf_conntrack_proto_icmp guarantees us that we only have ICMP_ECHO,
- * TIMESTAMP, INFO_REQUEST or ICMP_ADDRESS type icmp packets from here
- * on, which all have an ID field [relevant for hashing]. */
-
- hash = clusterip_hashfn(skb, cipinfo->config);
-
- switch (ctinfo) {
- case IP_CT_NEW:
- WRITE_ONCE(ct->mark, hash);
- break;
- case IP_CT_RELATED:
- case IP_CT_RELATED_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_REPLY:
- break;
- default: /* Prevent gcc warnings */
- break;
- }
-
-#ifdef DEBUG
- nf_ct_dump_tuple_ip(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
-#endif
- pr_debug("hash=%u ct_hash=%u ", hash, READ_ONCE(ct->mark));
- if (!clusterip_responsible(cipinfo->config, hash)) {
- pr_debug("not responsible\n");
- return NF_DROP;
- }
- pr_debug("responsible\n");
-
- /* despite being received via linklayer multicast, this is
- * actually a unicast IP packet. TCP doesn't like PACKET_MULTICAST */
- skb->pkt_type = PACKET_HOST;
-
- return XT_CONTINUE;
-}
-
-static int clusterip_tg_check(const struct xt_tgchk_param *par)
-{
- struct ipt_clusterip_tgt_info *cipinfo = par->targinfo;
- struct clusterip_net *cn = clusterip_pernet(par->net);
- const struct ipt_entry *e = par->entryinfo;
- struct clusterip_config *config;
- int ret, i;
-
- if (par->nft_compat) {
- pr_err("cannot use CLUSTERIP target from nftables compat\n");
- return -EOPNOTSUPP;
- }
-
- if (cn->hook_users == UINT_MAX)
- return -EOVERFLOW;
-
- if (cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP &&
- cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT &&
- cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT_DPT) {
- pr_info("unknown mode %u\n", cipinfo->hash_mode);
- return -EINVAL;
-
- }
- if (e->ip.dmsk.s_addr != htonl(0xffffffff) ||
- e->ip.dst.s_addr == 0) {
- pr_info("Please specify destination IP\n");
- return -EINVAL;
- }
- if (cipinfo->num_local_nodes > ARRAY_SIZE(cipinfo->local_nodes)) {
- pr_info("bad num_local_nodes %u\n", cipinfo->num_local_nodes);
- return -EINVAL;
- }
- for (i = 0; i < cipinfo->num_local_nodes; i++) {
- if (cipinfo->local_nodes[i] - 1 >=
- sizeof(config->local_nodes) * 8) {
- pr_info("bad local_nodes[%d] %u\n",
- i, cipinfo->local_nodes[i]);
- return -EINVAL;
- }
- }
-
- config = clusterip_config_find_get(par->net, e->ip.dst.s_addr, 1);
- if (!config) {
- if (!(cipinfo->flags & CLUSTERIP_FLAG_NEW)) {
- pr_info("no config found for %pI4, need 'new'\n",
- &e->ip.dst.s_addr);
- return -EINVAL;
- } else {
- config = clusterip_config_init(par->net, cipinfo,
- e->ip.dst.s_addr,
- e->ip.iniface);
- if (IS_ERR(config))
- return PTR_ERR(config);
- }
- } else if (memcmp(&config->clustermac, &cipinfo->clustermac, ETH_ALEN)) {
- clusterip_config_entry_put(config);
- clusterip_config_put(config);
- return -EINVAL;
- }
-
- ret = nf_ct_netns_get(par->net, par->family);
- if (ret < 0) {
- pr_info("cannot load conntrack support for proto=%u\n",
- par->family);
- clusterip_config_entry_put(config);
- clusterip_config_put(config);
- return ret;
- }
-
- if (cn->hook_users == 0) {
- ret = nf_register_net_hook(par->net, &cip_arp_ops);
-
- if (ret < 0) {
- clusterip_config_entry_put(config);
- clusterip_config_put(config);
- nf_ct_netns_put(par->net, par->family);
- return ret;
- }
- }
-
- cn->hook_users++;
-
- if (!cn->clusterip_deprecated_warning) {
- pr_info("ipt_CLUSTERIP is deprecated and it will removed soon, "
- "use xt_cluster instead\n");
- cn->clusterip_deprecated_warning = true;
- }
-
- cipinfo->config = config;
- return ret;
-}
-
-/* drop reference count of cluster config when rule is deleted */
-static void clusterip_tg_destroy(const struct xt_tgdtor_param *par)
-{
- const struct ipt_clusterip_tgt_info *cipinfo = par->targinfo;
- struct clusterip_net *cn = clusterip_pernet(par->net);
-
- /* 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);
-
- nf_ct_netns_put(par->net, par->family);
- cn->hook_users--;
-
- if (cn->hook_users == 0)
- nf_unregister_net_hook(par->net, &cip_arp_ops);
-}
-
-#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
-struct compat_ipt_clusterip_tgt_info
-{
- u_int32_t flags;
- u_int8_t clustermac[6];
- u_int16_t num_total_nodes;
- u_int16_t num_local_nodes;
- u_int16_t local_nodes[CLUSTERIP_MAX_NODES];
- u_int32_t hash_mode;
- u_int32_t hash_initval;
- compat_uptr_t config;
-};
-#endif /* CONFIG_NETFILTER_XTABLES_COMPAT */
-
-static struct xt_target clusterip_tg_reg __read_mostly = {
- .name = "CLUSTERIP",
- .family = NFPROTO_IPV4,
- .target = clusterip_tg,
- .checkentry = clusterip_tg_check,
- .destroy = clusterip_tg_destroy,
- .targetsize = sizeof(struct ipt_clusterip_tgt_info),
- .usersize = offsetof(struct ipt_clusterip_tgt_info, config),
-#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
- .compatsize = sizeof(struct compat_ipt_clusterip_tgt_info),
-#endif /* CONFIG_NETFILTER_XTABLES_COMPAT */
- .me = THIS_MODULE
-};
-
-
-/***********************************************************************
- * ARP MANGLING CODE
- ***********************************************************************/
-
-/* hardcoded for 48bit ethernet and 32bit ipv4 addresses */
-struct arp_payload {
- u_int8_t src_hw[ETH_ALEN];
- __be32 src_ip;
- u_int8_t dst_hw[ETH_ALEN];
- __be32 dst_ip;
-} __packed;
-
-#ifdef DEBUG
-static void arp_print(struct arp_payload *payload)
-{
-#define HBUFFERLEN 30
- char hbuffer[HBUFFERLEN];
- int j, k;
-
- for (k = 0, j = 0; k < HBUFFERLEN - 3 && j < ETH_ALEN; j++) {
- hbuffer[k++] = hex_asc_hi(payload->src_hw[j]);
- hbuffer[k++] = hex_asc_lo(payload->src_hw[j]);
- hbuffer[k++] = ':';
- }
- hbuffer[--k] = '\0';
-
- pr_debug("src %pI4@%s, dst %pI4\n",
- &payload->src_ip, hbuffer, &payload->dst_ip);
-}
-#endif
-
-static unsigned int
-clusterip_arp_mangle(void *priv, struct sk_buff *skb,
- const struct nf_hook_state *state)
-{
- struct arphdr *arp = arp_hdr(skb);
- struct arp_payload *payload;
- struct clusterip_config *c;
- struct net *net = state->net;
-
- /* 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(net, 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->ifindex != state->out->ifindex) {
- pr_debug("not mangling arp reply on different interface: cip'%d'-skb'%d'\n",
- c->ifindex, state->out->ifindex);
- clusterip_config_put(c);
- return NF_ACCEPT;
- }
-
- /* mangle reply hardware address */
- memcpy(payload->src_hw, c->clustermac, arp->ar_hln);
-
-#ifdef DEBUG
- pr_debug("mangled arp reply: ");
- arp_print(payload);
-#endif
-
- clusterip_config_put(c);
-
- return NF_ACCEPT;
-}
-
-/***********************************************************************
- * 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 clusterip_config *c = s->private;
- 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 = 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)
-{
- if (!IS_ERR(v))
- kfree(v);
-}
-
-static int clusterip_seq_show(struct seq_file *s, void *v)
-{
- struct clusterip_seq_position *idx = 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 const 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 clusterip_config *c = pde_data(inode);
-
- sf->private = c;
-
- clusterip_config_get(c);
- }
-
- return ret;
-}
-
-static int clusterip_proc_release(struct inode *inode, struct file *file)
-{
- struct clusterip_config *c = pde_data(inode);
- 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)
-{
- struct clusterip_config *c = pde_data(file_inode(file));
-#define PROC_WRITELEN 10
- char buffer[PROC_WRITELEN+1];
- unsigned long nodenum;
- int rc;
-
- if (size > PROC_WRITELEN)
- return -EIO;
- if (copy_from_user(buffer, input, size))
- return -EFAULT;
- buffer[size] = 0;
-
- if (*buffer == '+') {
- rc = kstrtoul(buffer+1, 10, &nodenum);
- if (rc)
- return rc;
- if (clusterip_add_node(c, nodenum))
- return -ENOMEM;
- } else if (*buffer == '-') {
- rc = kstrtoul(buffer+1, 10, &nodenum);
- if (rc)
- return rc;
- if (clusterip_del_node(c, nodenum))
- return -ENOENT;
- } else
- return -EIO;
-
- return size;
-}
-
-static const struct proc_ops clusterip_proc_ops = {
- .proc_open = clusterip_proc_open,
- .proc_read = seq_read,
- .proc_write = clusterip_proc_write,
- .proc_lseek = seq_lseek,
- .proc_release = clusterip_proc_release,
-};
-
-#endif /* CONFIG_PROC_FS */
-
-static int clusterip_net_init(struct net *net)
-{
- struct clusterip_net *cn = clusterip_pernet(net);
-
- INIT_LIST_HEAD(&cn->configs);
-
- spin_lock_init(&cn->lock);
-
-#ifdef CONFIG_PROC_FS
- cn->procdir = proc_mkdir("ipt_CLUSTERIP", net->proc_net);
- if (!cn->procdir) {
- pr_err("Unable to proc dir entry\n");
- return -ENOMEM;
- }
- mutex_init(&cn->mutex);
-#endif /* CONFIG_PROC_FS */
-
- return 0;
-}
-
-static void clusterip_net_exit(struct net *net)
-{
-#ifdef CONFIG_PROC_FS
- struct clusterip_net *cn = clusterip_pernet(net);
-
- mutex_lock(&cn->mutex);
- proc_remove(cn->procdir);
- cn->procdir = NULL;
- mutex_unlock(&cn->mutex);
-#endif
-}
-
-static struct pernet_operations clusterip_net_ops = {
- .init = clusterip_net_init,
- .exit = clusterip_net_exit,
- .id = &clusterip_net_id,
- .size = sizeof(struct clusterip_net),
-};
-
-static struct notifier_block cip_netdev_notifier = {
- .notifier_call = clusterip_netdev_event
-};
-
-static int __init clusterip_tg_init(void)
-{
- int ret;
-
- ret = register_pernet_subsys(&clusterip_net_ops);
- if (ret < 0)
- return ret;
-
- ret = xt_register_target(&clusterip_tg_reg);
- if (ret < 0)
- goto cleanup_subsys;
-
- ret = register_netdevice_notifier(&cip_netdev_notifier);
- if (ret < 0)
- goto unregister_target;
-
- pr_info("ClusterIP Version %s loaded successfully\n",
- CLUSTERIP_VERSION);
-
- return 0;
-
-unregister_target:
- xt_unregister_target(&clusterip_tg_reg);
-cleanup_subsys:
- unregister_pernet_subsys(&clusterip_net_ops);
- return ret;
-}
-
-static void __exit clusterip_tg_exit(void)
-{
- pr_info("ClusterIP Version %s unloading\n", CLUSTERIP_VERSION);
-
- unregister_netdevice_notifier(&cip_netdev_notifier);
- xt_unregister_target(&clusterip_tg_reg);
- unregister_pernet_subsys(&clusterip_net_ops);
-
- /* Wait for completion of call_rcu()'s (clusterip_config_rcu_free) */
- rcu_barrier();
-}
-
-module_init(clusterip_tg_init);
-module_exit(clusterip_tg_exit);
--
2.38.2
