diff options
Diffstat (limited to 'net/ipv4/netfilter')
| -rw-r--r-- | net/ipv4/netfilter/ipt_CLUSTERIP.c | 155 |
1 files changed, 87 insertions, 68 deletions
diff --git a/net/ipv4/netfilter/ipt_CLUSTERIP.c b/net/ipv4/netfilter/ipt_CLUSTERIP.c index 5b0c1ee6ae26..091d163d215b 100644 --- a/net/ipv4/netfilter/ipt_CLUSTERIP.c +++ b/net/ipv4/netfilter/ipt_CLUSTERIP.c @@ -57,17 +57,14 @@ struct clusterip_config { enum clusterip_hashmode hash_mode; /* which hashing mode */ u_int32_t hash_initval; /* hash initialization */ struct rcu_head rcu; - + struct net *net; /* netns for pernet list */ char ifname[IFNAMSIZ]; /* device ifname */ - struct notifier_block notifier; /* refresh c->ifindex in it */ }; #ifdef CONFIG_PROC_FS static const struct file_operations clusterip_proc_fops; #endif -static unsigned int clusterip_net_id __read_mostly; - struct clusterip_net { struct list_head configs; /* lock protects the configs list */ @@ -78,16 +75,30 @@ struct clusterip_net { #endif }; +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) { - kfree(container_of(head, struct clusterip_config, rcu)); + 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 @@ -101,9 +112,9 @@ clusterip_config_put(struct clusterip_config *c) * 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 net *net, struct clusterip_config *c) +clusterip_config_entry_put(struct clusterip_config *c) { - struct clusterip_net *cn = net_generic(net, clusterip_net_id); + struct clusterip_net *cn = clusterip_pernet(c->net); local_bh_disable(); if (refcount_dec_and_lock(&c->entries, &cn->lock)) { @@ -118,8 +129,6 @@ clusterip_config_entry_put(struct net *net, struct clusterip_config *c) spin_unlock(&cn->lock); local_bh_enable(); - unregister_netdevice_notifier(&c->notifier); - return; } local_bh_enable(); @@ -129,7 +138,7 @@ static struct clusterip_config * __clusterip_config_find(struct net *net, __be32 clusterip) { struct clusterip_config *c; - struct clusterip_net *cn = net_generic(net, clusterip_net_id); + struct clusterip_net *cn = clusterip_pernet(net); list_for_each_entry_rcu(c, &cn->configs, list) { if (c->clusterip == clusterip) @@ -181,32 +190,37 @@ 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; - c = container_of(this, struct clusterip_config, notifier); - 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; + 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; } - break; } + spin_unlock_bh(&cn->lock); return NOTIFY_DONE; } @@ -215,30 +229,44 @@ 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 = net_generic(net, clusterip_net_id); + 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); - strcpy(c->ifname, iniface); - c->ifindex = -1; - c->clusterip = ip; + 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)) { - spin_unlock_bh(&cn->lock); - kfree(c); - - return ERR_PTR(-EBUSY); + err = -EBUSY; + goto out_config_put; } list_add_rcu(&c->list, &cn->configs); @@ -260,22 +288,17 @@ clusterip_config_init(struct net *net, const struct ipt_clusterip_tgt_info *i, } #endif - c->notifier.notifier_call = clusterip_netdev_event; - err = register_netdevice_notifier(&c->notifier); - if (!err) { - refcount_set(&c->entries, 1); - return c; - } + refcount_set(&c->entries, 1); + return c; #ifdef CONFIG_PROC_FS - proc_remove(c->pde); 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); } @@ -475,21 +498,6 @@ static int clusterip_tg_check(const struct xt_tgchk_param *par) &e->ip.dst.s_addr); return -EINVAL; } else { - struct net_device *dev; - - if (e->ip.iniface[0] == '\0') { - pr_info("Please specify an interface name\n"); - return -EINVAL; - } - - dev = dev_get_by_name(par->net, e->ip.iniface); - if (!dev) { - pr_info("no such interface %s\n", - e->ip.iniface); - return -ENOENT; - } - dev_put(dev); - config = clusterip_config_init(par->net, cipinfo, e->ip.dst.s_addr, e->ip.iniface); @@ -502,7 +510,7 @@ static int clusterip_tg_check(const struct xt_tgchk_param *par) if (ret < 0) { pr_info("cannot load conntrack support for proto=%u\n", par->family); - clusterip_config_entry_put(par->net, config); + clusterip_config_entry_put(config); clusterip_config_put(config); return ret; } @@ -524,7 +532,7 @@ static void clusterip_tg_destroy(const struct xt_tgdtor_param *par) /* if no more entries are referencing the config, remove it * from the list and destroy the proc entry */ - clusterip_config_entry_put(par->net, cipinfo->config); + clusterip_config_entry_put(cipinfo->config); clusterip_config_put(cipinfo->config); @@ -806,7 +814,7 @@ static const struct file_operations clusterip_proc_fops = { static int clusterip_net_init(struct net *net) { - struct clusterip_net *cn = net_generic(net, clusterip_net_id); + struct clusterip_net *cn = clusterip_pernet(net); int ret; INIT_LIST_HEAD(&cn->configs); @@ -831,7 +839,7 @@ static int clusterip_net_init(struct net *net) static void clusterip_net_exit(struct net *net) { - struct clusterip_net *cn = net_generic(net, clusterip_net_id); + struct clusterip_net *cn = clusterip_pernet(net); #ifdef CONFIG_PROC_FS proc_remove(cn->procdir); cn->procdir = NULL; @@ -847,6 +855,10 @@ static struct pernet_operations clusterip_net_ops = { .size = sizeof(struct clusterip_net), }; +struct notifier_block cip_netdev_notifier = { + .notifier_call = clusterip_netdev_event +}; + static int __init clusterip_tg_init(void) { int ret; @@ -859,11 +871,17 @@ static int __init clusterip_tg_init(void) 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; @@ -873,6 +891,7 @@ 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); |