![Joe Perches](/assets/img/avatar_default.png)
Standardize the net core ratelimited logging functions. Coalesce formats, align arguments. Change a printk then vprintk sequence to use printf extension %pV. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
745 lines
18 KiB
C
745 lines
18 KiB
C
/* Cluster IP hashmark target
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* (C) 2003-2004 by Harald Welte <laforge@netfilter.org>
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* based on ideas of Fabio Olive Leite <olive@unixforge.org>
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*
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* Development of this code funded by SuSE Linux AG, http://www.suse.com/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/proc_fs.h>
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#include <linux/jhash.h>
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#include <linux/bitops.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <linux/ip.h>
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#include <linux/tcp.h>
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#include <linux/udp.h>
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#include <linux/icmp.h>
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#include <linux/if_arp.h>
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#include <linux/seq_file.h>
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#include <linux/netfilter_arp.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter_ipv4/ip_tables.h>
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#include <linux/netfilter_ipv4/ipt_CLUSTERIP.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/net_namespace.h>
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#include <net/checksum.h>
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#include <net/ip.h>
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#define CLUSTERIP_VERSION "0.8"
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
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MODULE_DESCRIPTION("Xtables: CLUSTERIP target");
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struct clusterip_config {
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struct list_head list; /* list of all configs */
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atomic_t refcount; /* reference count */
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atomic_t entries; /* number of entries/rules
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* referencing us */
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__be32 clusterip; /* the IP address */
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u_int8_t clustermac[ETH_ALEN]; /* the MAC address */
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struct net_device *dev; /* device */
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u_int16_t num_total_nodes; /* total number of nodes */
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unsigned long local_nodes; /* node number array */
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#ifdef CONFIG_PROC_FS
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struct proc_dir_entry *pde; /* proc dir entry */
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#endif
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enum clusterip_hashmode hash_mode; /* which hashing mode */
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u_int32_t hash_initval; /* hash initialization */
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struct rcu_head rcu;
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};
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static LIST_HEAD(clusterip_configs);
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/* clusterip_lock protects the clusterip_configs list */
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static DEFINE_SPINLOCK(clusterip_lock);
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#ifdef CONFIG_PROC_FS
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static const struct file_operations clusterip_proc_fops;
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static struct proc_dir_entry *clusterip_procdir;
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#endif
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static inline void
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clusterip_config_get(struct clusterip_config *c)
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{
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atomic_inc(&c->refcount);
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}
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static void clusterip_config_rcu_free(struct rcu_head *head)
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{
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kfree(container_of(head, struct clusterip_config, rcu));
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}
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static inline void
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clusterip_config_put(struct clusterip_config *c)
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{
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if (atomic_dec_and_test(&c->refcount))
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call_rcu_bh(&c->rcu, clusterip_config_rcu_free);
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}
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/* decrease the count of entries using/referencing this config. If last
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* entry(rule) is removed, remove the config from lists, but don't free it
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* yet, since proc-files could still be holding references */
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static inline void
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clusterip_config_entry_put(struct clusterip_config *c)
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{
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local_bh_disable();
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if (atomic_dec_and_lock(&c->entries, &clusterip_lock)) {
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list_del_rcu(&c->list);
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spin_unlock(&clusterip_lock);
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local_bh_enable();
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dev_mc_del(c->dev, c->clustermac);
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dev_put(c->dev);
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/* In case anyone still accesses the file, the open/close
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* functions are also incrementing the refcount on their own,
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* so it's safe to remove the entry even if it's in use. */
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#ifdef CONFIG_PROC_FS
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remove_proc_entry(c->pde->name, c->pde->parent);
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#endif
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return;
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}
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local_bh_enable();
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}
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static struct clusterip_config *
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__clusterip_config_find(__be32 clusterip)
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{
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struct clusterip_config *c;
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list_for_each_entry_rcu(c, &clusterip_configs, list) {
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if (c->clusterip == clusterip)
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return c;
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}
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return NULL;
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}
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static inline struct clusterip_config *
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clusterip_config_find_get(__be32 clusterip, int entry)
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{
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struct clusterip_config *c;
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rcu_read_lock_bh();
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c = __clusterip_config_find(clusterip);
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if (c) {
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if (unlikely(!atomic_inc_not_zero(&c->refcount)))
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c = NULL;
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else if (entry)
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atomic_inc(&c->entries);
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}
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rcu_read_unlock_bh();
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return c;
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}
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static void
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clusterip_config_init_nodelist(struct clusterip_config *c,
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const struct ipt_clusterip_tgt_info *i)
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{
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int n;
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for (n = 0; n < i->num_local_nodes; n++)
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set_bit(i->local_nodes[n] - 1, &c->local_nodes);
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}
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static struct clusterip_config *
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clusterip_config_init(const struct ipt_clusterip_tgt_info *i, __be32 ip,
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struct net_device *dev)
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{
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struct clusterip_config *c;
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c = kzalloc(sizeof(*c), GFP_ATOMIC);
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if (!c)
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return NULL;
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c->dev = dev;
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c->clusterip = ip;
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memcpy(&c->clustermac, &i->clustermac, ETH_ALEN);
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c->num_total_nodes = i->num_total_nodes;
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clusterip_config_init_nodelist(c, i);
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c->hash_mode = i->hash_mode;
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c->hash_initval = i->hash_initval;
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atomic_set(&c->refcount, 1);
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atomic_set(&c->entries, 1);
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#ifdef CONFIG_PROC_FS
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{
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char buffer[16];
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/* create proc dir entry */
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sprintf(buffer, "%pI4", &ip);
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c->pde = proc_create_data(buffer, S_IWUSR|S_IRUSR,
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clusterip_procdir,
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&clusterip_proc_fops, c);
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if (!c->pde) {
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kfree(c);
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return NULL;
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}
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}
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#endif
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spin_lock_bh(&clusterip_lock);
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list_add_rcu(&c->list, &clusterip_configs);
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spin_unlock_bh(&clusterip_lock);
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return c;
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}
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#ifdef CONFIG_PROC_FS
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static int
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clusterip_add_node(struct clusterip_config *c, u_int16_t nodenum)
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{
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if (nodenum == 0 ||
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nodenum > c->num_total_nodes)
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return 1;
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/* check if we already have this number in our bitfield */
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if (test_and_set_bit(nodenum - 1, &c->local_nodes))
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return 1;
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return 0;
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}
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static bool
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clusterip_del_node(struct clusterip_config *c, u_int16_t nodenum)
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{
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if (nodenum == 0 ||
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nodenum > c->num_total_nodes)
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return true;
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if (test_and_clear_bit(nodenum - 1, &c->local_nodes))
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return false;
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return true;
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}
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#endif
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static inline u_int32_t
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clusterip_hashfn(const struct sk_buff *skb,
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const struct clusterip_config *config)
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{
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const struct iphdr *iph = ip_hdr(skb);
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unsigned long hashval;
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u_int16_t sport = 0, dport = 0;
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int poff;
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poff = proto_ports_offset(iph->protocol);
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if (poff >= 0) {
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const u_int16_t *ports;
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u16 _ports[2];
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ports = skb_header_pointer(skb, iph->ihl * 4 + poff, 4, _ports);
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if (ports) {
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sport = ports[0];
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dport = ports[1];
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}
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} else {
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net_info_ratelimited("unknown protocol %u\n", iph->protocol);
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}
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switch (config->hash_mode) {
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case CLUSTERIP_HASHMODE_SIP:
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hashval = jhash_1word(ntohl(iph->saddr),
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config->hash_initval);
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break;
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case CLUSTERIP_HASHMODE_SIP_SPT:
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hashval = jhash_2words(ntohl(iph->saddr), sport,
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config->hash_initval);
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break;
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case CLUSTERIP_HASHMODE_SIP_SPT_DPT:
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hashval = jhash_3words(ntohl(iph->saddr), sport, dport,
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config->hash_initval);
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break;
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default:
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/* to make gcc happy */
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hashval = 0;
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/* This cannot happen, unless the check function wasn't called
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* at rule load time */
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pr_info("unknown mode %u\n", config->hash_mode);
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BUG();
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break;
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}
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/* node numbers are 1..n, not 0..n */
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return (((u64)hashval * config->num_total_nodes) >> 32) + 1;
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}
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static inline int
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clusterip_responsible(const struct clusterip_config *config, u_int32_t hash)
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{
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return test_bit(hash - 1, &config->local_nodes);
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}
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/***********************************************************************
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* IPTABLES TARGET
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***********************************************************************/
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static unsigned int
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clusterip_tg(struct sk_buff *skb, const struct xt_action_param *par)
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{
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const struct ipt_clusterip_tgt_info *cipinfo = par->targinfo;
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struct nf_conn *ct;
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enum ip_conntrack_info ctinfo;
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u_int32_t hash;
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/* don't need to clusterip_config_get() here, since refcount
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* is only decremented by destroy() - and ip_tables guarantees
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* that the ->target() function isn't called after ->destroy() */
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ct = nf_ct_get(skb, &ctinfo);
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if (ct == NULL)
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return NF_DROP;
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/* special case: ICMP error handling. conntrack distinguishes between
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* error messages (RELATED) and information requests (see below) */
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if (ip_hdr(skb)->protocol == IPPROTO_ICMP &&
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(ctinfo == IP_CT_RELATED ||
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ctinfo == IP_CT_RELATED_REPLY))
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return XT_CONTINUE;
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/* ip_conntrack_icmp guarantees us that we only have ICMP_ECHO,
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* TIMESTAMP, INFO_REQUEST or ADDRESS type icmp packets from here
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* on, which all have an ID field [relevant for hashing]. */
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hash = clusterip_hashfn(skb, cipinfo->config);
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switch (ctinfo) {
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case IP_CT_NEW:
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ct->mark = hash;
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break;
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case IP_CT_RELATED:
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case IP_CT_RELATED_REPLY:
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/* FIXME: we don't handle expectations at the moment.
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* They can arrive on a different node than
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* the master connection (e.g. FTP passive mode) */
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case IP_CT_ESTABLISHED:
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case IP_CT_ESTABLISHED_REPLY:
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break;
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default: /* Prevent gcc warnings */
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break;
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}
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#ifdef DEBUG
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nf_ct_dump_tuple_ip(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
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#endif
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pr_debug("hash=%u ct_hash=%u ", hash, ct->mark);
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if (!clusterip_responsible(cipinfo->config, hash)) {
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pr_debug("not responsible\n");
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return NF_DROP;
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}
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pr_debug("responsible\n");
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/* despite being received via linklayer multicast, this is
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* actually a unicast IP packet. TCP doesn't like PACKET_MULTICAST */
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skb->pkt_type = PACKET_HOST;
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return XT_CONTINUE;
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}
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static int clusterip_tg_check(const struct xt_tgchk_param *par)
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{
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struct ipt_clusterip_tgt_info *cipinfo = par->targinfo;
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const struct ipt_entry *e = par->entryinfo;
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struct clusterip_config *config;
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int ret;
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if (cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP &&
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cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT &&
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cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT_DPT) {
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pr_info("unknown mode %u\n", cipinfo->hash_mode);
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return -EINVAL;
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}
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if (e->ip.dmsk.s_addr != htonl(0xffffffff) ||
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e->ip.dst.s_addr == 0) {
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pr_info("Please specify destination IP\n");
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return -EINVAL;
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}
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/* FIXME: further sanity checks */
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config = clusterip_config_find_get(e->ip.dst.s_addr, 1);
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if (!config) {
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if (!(cipinfo->flags & CLUSTERIP_FLAG_NEW)) {
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pr_info("no config found for %pI4, need 'new'\n",
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&e->ip.dst.s_addr);
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return -EINVAL;
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} else {
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struct net_device *dev;
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if (e->ip.iniface[0] == '\0') {
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pr_info("Please specify an interface name\n");
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return -EINVAL;
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}
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dev = dev_get_by_name(&init_net, e->ip.iniface);
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if (!dev) {
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pr_info("no such interface %s\n",
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e->ip.iniface);
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return -ENOENT;
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}
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config = clusterip_config_init(cipinfo,
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e->ip.dst.s_addr, dev);
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if (!config) {
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dev_put(dev);
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return -ENOMEM;
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}
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dev_mc_add(config->dev, config->clustermac);
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}
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}
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cipinfo->config = config;
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ret = nf_ct_l3proto_try_module_get(par->family);
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if (ret < 0)
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pr_info("cannot load conntrack support for proto=%u\n",
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par->family);
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return ret;
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}
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/* drop reference count of cluster config when rule is deleted */
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static void clusterip_tg_destroy(const struct xt_tgdtor_param *par)
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{
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const struct ipt_clusterip_tgt_info *cipinfo = par->targinfo;
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/* if no more entries are referencing the config, remove it
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* from the list and destroy the proc entry */
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clusterip_config_entry_put(cipinfo->config);
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clusterip_config_put(cipinfo->config);
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nf_ct_l3proto_module_put(par->family);
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}
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#ifdef CONFIG_COMPAT
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struct compat_ipt_clusterip_tgt_info
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{
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u_int32_t flags;
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u_int8_t clustermac[6];
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u_int16_t num_total_nodes;
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u_int16_t num_local_nodes;
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u_int16_t local_nodes[CLUSTERIP_MAX_NODES];
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u_int32_t hash_mode;
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u_int32_t hash_initval;
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compat_uptr_t config;
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};
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#endif /* CONFIG_COMPAT */
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static struct xt_target clusterip_tg_reg __read_mostly = {
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.name = "CLUSTERIP",
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.family = NFPROTO_IPV4,
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.target = clusterip_tg,
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.checkentry = clusterip_tg_check,
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.destroy = clusterip_tg_destroy,
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.targetsize = sizeof(struct ipt_clusterip_tgt_info),
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#ifdef CONFIG_COMPAT
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.compatsize = sizeof(struct compat_ipt_clusterip_tgt_info),
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#endif /* CONFIG_COMPAT */
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.me = THIS_MODULE
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};
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/***********************************************************************
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* ARP MANGLING CODE
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***********************************************************************/
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/* hardcoded for 48bit ethernet and 32bit ipv4 addresses */
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struct arp_payload {
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u_int8_t src_hw[ETH_ALEN];
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__be32 src_ip;
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u_int8_t dst_hw[ETH_ALEN];
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__be32 dst_ip;
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} __packed;
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#ifdef DEBUG
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static void arp_print(struct arp_payload *payload)
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{
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#define HBUFFERLEN 30
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char hbuffer[HBUFFERLEN];
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int j,k;
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for (k=0, j=0; k < HBUFFERLEN-3 && j < ETH_ALEN; j++) {
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hbuffer[k++] = hex_asc_hi(payload->src_hw[j]);
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hbuffer[k++] = hex_asc_lo(payload->src_hw[j]);
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hbuffer[k++]=':';
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}
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hbuffer[--k]='\0';
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pr_debug("src %pI4@%s, dst %pI4\n",
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&payload->src_ip, hbuffer, &payload->dst_ip);
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}
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#endif
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static unsigned int
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arp_mangle(unsigned int hook,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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struct arphdr *arp = arp_hdr(skb);
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struct arp_payload *payload;
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struct clusterip_config *c;
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/* we don't care about non-ethernet and non-ipv4 ARP */
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if (arp->ar_hrd != htons(ARPHRD_ETHER) ||
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arp->ar_pro != htons(ETH_P_IP) ||
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arp->ar_pln != 4 || arp->ar_hln != ETH_ALEN)
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return NF_ACCEPT;
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/* we only want to mangle arp requests and replies */
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if (arp->ar_op != htons(ARPOP_REPLY) &&
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arp->ar_op != htons(ARPOP_REQUEST))
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return NF_ACCEPT;
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payload = (void *)(arp+1);
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/* 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) {
|
|
pr_debug("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 DEBUG
|
|
pr_debug("mangled arp reply: ");
|
|
arp_print(payload);
|
|
#endif
|
|
|
|
clusterip_config_put(c);
|
|
|
|
return NF_ACCEPT;
|
|
}
|
|
|
|
static struct nf_hook_ops cip_arp_ops __read_mostly = {
|
|
.hook = arp_mangle,
|
|
.pf = NFPROTO_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 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(inode)->data;
|
|
|
|
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(inode)->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)
|
|
{
|
|
struct clusterip_config *c = PDE(file->f_path.dentry->d_inode)->data;
|
|
#define PROC_WRITELEN 10
|
|
char buffer[PROC_WRITELEN+1];
|
|
unsigned long nodenum;
|
|
|
|
if (size > PROC_WRITELEN)
|
|
return -EIO;
|
|
if (copy_from_user(buffer, input, size))
|
|
return -EFAULT;
|
|
buffer[size] = 0;
|
|
|
|
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 const 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 clusterip_tg_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = xt_register_target(&clusterip_tg_reg);
|
|
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", init_net.proc_net);
|
|
if (!clusterip_procdir) {
|
|
pr_err("Unable to proc dir entry\n");
|
|
ret = -ENOMEM;
|
|
goto cleanup_hook;
|
|
}
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
pr_info("ClusterIP Version %s loaded successfully\n",
|
|
CLUSTERIP_VERSION);
|
|
return 0;
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
cleanup_hook:
|
|
nf_unregister_hook(&cip_arp_ops);
|
|
#endif /* CONFIG_PROC_FS */
|
|
cleanup_target:
|
|
xt_unregister_target(&clusterip_tg_reg);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit clusterip_tg_exit(void)
|
|
{
|
|
pr_info("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);
|
|
xt_unregister_target(&clusterip_tg_reg);
|
|
|
|
/* Wait for completion of call_rcu_bh()'s (clusterip_config_rcu_free) */
|
|
rcu_barrier_bh();
|
|
}
|
|
|
|
module_init(clusterip_tg_init);
|
|
module_exit(clusterip_tg_exit);
|