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author | Gao feng <gaofeng@cn.fujitsu.com> | 2013-03-24 23:50:40 +0000 |
---|---|---|
committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2013-04-05 20:12:54 +0200 |
commit | 30e0c6a6bee24db0166b7ca709277cd693e179f2 (patch) | |
tree | 264a13fcbf0d76de9e1b3f076ac7f8b045c6c5d5 /net/netfilter/nf_log.c | |
parent | f3c1a44a2208d14b061ad665d9549c9b321f38e5 (diff) | |
download | linux-30e0c6a6bee24db0166b7ca709277cd693e179f2.tar.gz linux-30e0c6a6bee24db0166b7ca709277cd693e179f2.tar.bz2 linux-30e0c6a6bee24db0166b7ca709277cd693e179f2.zip |
netfilter: nf_log: prepare net namespace support for loggers
This patch adds netns support to nf_log and it prepares netns
support for existing loggers. It is composed of four major
changes.
1) nf_log_register has been split to two functions: nf_log_register
and nf_log_set. The new nf_log_register is used to globally
register the nf_logger and nf_log_set is used for enabling
pernet support from nf_loggers.
Per netns is not yet complete after this patch, it comes in
separate follow up patches.
2) Add net as a parameter of nf_log_bind_pf. Per netns is not
yet complete after this patch, it only allows to bind the
nf_logger to the protocol family from init_net and it skips
other cases.
3) Adapt all nf_log_packet callers to pass netns as parameter.
After this patch, this function only works for init_net.
4) Make the sysctl net/netfilter/nf_log pernet.
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/nf_log.c')
-rw-r--r-- | net/netfilter/nf_log.c | 225 |
1 files changed, 168 insertions, 57 deletions
diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c index 9e312695c818..8d331dc9b1ea 100644 --- a/net/netfilter/nf_log.c +++ b/net/netfilter/nf_log.c @@ -16,7 +16,6 @@ #define NF_LOG_PREFIXLEN 128 #define NFLOGGER_NAME_LEN 64 -static const struct nf_logger __rcu *nf_loggers[NFPROTO_NUMPROTO] __read_mostly; static struct list_head nf_loggers_l[NFPROTO_NUMPROTO] __read_mostly; static DEFINE_MUTEX(nf_log_mutex); @@ -32,13 +31,52 @@ static struct nf_logger *__find_logger(int pf, const char *str_logger) return NULL; } +void nf_log_set(struct net *net, u_int8_t pf, const struct nf_logger *logger) +{ + const struct nf_logger *log; + + if (!net_eq(net, &init_net)) + return; + + if (pf == NFPROTO_UNSPEC) + return; + + mutex_lock(&nf_log_mutex); + log = rcu_dereference_protected(net->nf.nf_loggers[pf], + lockdep_is_held(&nf_log_mutex)); + if (log == NULL) + rcu_assign_pointer(net->nf.nf_loggers[pf], logger); + + mutex_unlock(&nf_log_mutex); +} +EXPORT_SYMBOL(nf_log_set); + +void nf_log_unset(struct net *net, const struct nf_logger *logger) +{ + int i; + const struct nf_logger *log; + + if (!net_eq(net, &init_net)) + return; + + mutex_lock(&nf_log_mutex); + for (i = 0; i < NFPROTO_NUMPROTO; i++) { + log = rcu_dereference_protected(net->nf.nf_loggers[i], + lockdep_is_held(&nf_log_mutex)); + if (log == logger) + RCU_INIT_POINTER(net->nf.nf_loggers[i], NULL); + } + mutex_unlock(&nf_log_mutex); + synchronize_rcu(); +} +EXPORT_SYMBOL(nf_log_unset); + /* return EEXIST if the same logger is registered, 0 on success. */ int nf_log_register(u_int8_t pf, struct nf_logger *logger) { - const struct nf_logger *llog; int i; - if (pf >= ARRAY_SIZE(nf_loggers)) + if (pf >= ARRAY_SIZE(init_net.nf.nf_loggers)) return -EINVAL; for (i = 0; i < ARRAY_SIZE(logger->list); i++) @@ -52,63 +90,62 @@ int nf_log_register(u_int8_t pf, struct nf_logger *logger) } else { /* register at end of list to honor first register win */ list_add_tail(&logger->list[pf], &nf_loggers_l[pf]); - llog = rcu_dereference_protected(nf_loggers[pf], - lockdep_is_held(&nf_log_mutex)); - if (llog == NULL) - rcu_assign_pointer(nf_loggers[pf], logger); } mutex_unlock(&nf_log_mutex); + nf_log_set(&init_net, pf, logger); return 0; } EXPORT_SYMBOL(nf_log_register); void nf_log_unregister(struct nf_logger *logger) { - const struct nf_logger *c_logger; int i; mutex_lock(&nf_log_mutex); - for (i = 0; i < ARRAY_SIZE(nf_loggers); i++) { - c_logger = rcu_dereference_protected(nf_loggers[i], - lockdep_is_held(&nf_log_mutex)); - if (c_logger == logger) - RCU_INIT_POINTER(nf_loggers[i], NULL); + for (i = 0; i < NFPROTO_NUMPROTO; i++) list_del(&logger->list[i]); - } mutex_unlock(&nf_log_mutex); - synchronize_rcu(); + nf_log_unset(&init_net, logger); } EXPORT_SYMBOL(nf_log_unregister); -int nf_log_bind_pf(u_int8_t pf, const struct nf_logger *logger) +int nf_log_bind_pf(struct net *net, u_int8_t pf, + const struct nf_logger *logger) { - if (pf >= ARRAY_SIZE(nf_loggers)) + if (!net_eq(net, &init_net)) + return 0; + + if (pf >= ARRAY_SIZE(net->nf.nf_loggers)) return -EINVAL; mutex_lock(&nf_log_mutex); if (__find_logger(pf, logger->name) == NULL) { mutex_unlock(&nf_log_mutex); return -ENOENT; } - rcu_assign_pointer(nf_loggers[pf], logger); + rcu_assign_pointer(net->nf.nf_loggers[pf], logger); mutex_unlock(&nf_log_mutex); return 0; } EXPORT_SYMBOL(nf_log_bind_pf); -void nf_log_unbind_pf(u_int8_t pf) +void nf_log_unbind_pf(struct net *net, u_int8_t pf) { - if (pf >= ARRAY_SIZE(nf_loggers)) + if (!net_eq(net, &init_net)) + return; + + if (pf >= ARRAY_SIZE(net->nf.nf_loggers)) return; mutex_lock(&nf_log_mutex); - RCU_INIT_POINTER(nf_loggers[pf], NULL); + RCU_INIT_POINTER(net->nf.nf_loggers[pf], NULL); mutex_unlock(&nf_log_mutex); } EXPORT_SYMBOL(nf_log_unbind_pf); -void nf_log_packet(u_int8_t pf, +void nf_log_packet(struct net *net, + u_int8_t pf, unsigned int hooknum, const struct sk_buff *skb, const struct net_device *in, @@ -120,8 +157,11 @@ void nf_log_packet(u_int8_t pf, char prefix[NF_LOG_PREFIXLEN]; const struct nf_logger *logger; + if (!net_eq(net, &init_net)) + return; + rcu_read_lock(); - logger = rcu_dereference(nf_loggers[pf]); + logger = rcu_dereference(net->nf.nf_loggers[pf]); if (logger) { va_start(args, fmt); vsnprintf(prefix, sizeof(prefix), fmt, args); @@ -135,9 +175,11 @@ EXPORT_SYMBOL(nf_log_packet); #ifdef CONFIG_PROC_FS static void *seq_start(struct seq_file *seq, loff_t *pos) { + struct net *net = seq_file_net(seq); + mutex_lock(&nf_log_mutex); - if (*pos >= ARRAY_SIZE(nf_loggers)) + if (*pos >= ARRAY_SIZE(net->nf.nf_loggers)) return NULL; return pos; @@ -145,9 +187,11 @@ static void *seq_start(struct seq_file *seq, loff_t *pos) static void *seq_next(struct seq_file *s, void *v, loff_t *pos) { + struct net *net = seq_file_net(s); + (*pos)++; - if (*pos >= ARRAY_SIZE(nf_loggers)) + if (*pos >= ARRAY_SIZE(net->nf.nf_loggers)) return NULL; return pos; @@ -164,8 +208,9 @@ static int seq_show(struct seq_file *s, void *v) const struct nf_logger *logger; struct nf_logger *t; int ret; + struct net *net = seq_file_net(s); - logger = rcu_dereference_protected(nf_loggers[*pos], + logger = rcu_dereference_protected(net->nf.nf_loggers[*pos], lockdep_is_held(&nf_log_mutex)); if (!logger) @@ -199,7 +244,8 @@ static const struct seq_operations nflog_seq_ops = { static int nflog_open(struct inode *inode, struct file *file) { - return seq_open(file, &nflog_seq_ops); + return seq_open_net(inode, file, &nflog_seq_ops, + sizeof(struct seq_net_private)); } static const struct file_operations nflog_file_ops = { @@ -207,7 +253,7 @@ static const struct file_operations nflog_file_ops = { .open = nflog_open, .read = seq_read, .llseek = seq_lseek, - .release = seq_release, + .release = seq_release_net, }; @@ -216,7 +262,6 @@ static const struct file_operations nflog_file_ops = { #ifdef CONFIG_SYSCTL static char nf_log_sysctl_fnames[NFPROTO_NUMPROTO-NFPROTO_UNSPEC][3]; static struct ctl_table nf_log_sysctl_table[NFPROTO_NUMPROTO+1]; -static struct ctl_table_header *nf_log_dir_header; static int nf_log_proc_dostring(ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) @@ -226,15 +271,19 @@ static int nf_log_proc_dostring(ctl_table *table, int write, size_t size = *lenp; int r = 0; int tindex = (unsigned long)table->extra1; + struct net *net = current->nsproxy->net_ns; if (write) { + if (!net_eq(net, &init_net)) + return -EPERM; + if (size > sizeof(buf)) size = sizeof(buf); if (copy_from_user(buf, buffer, size)) return -EFAULT; if (!strcmp(buf, "NONE")) { - nf_log_unbind_pf(tindex); + nf_log_unbind_pf(net, tindex); return 0; } mutex_lock(&nf_log_mutex); @@ -243,11 +292,11 @@ static int nf_log_proc_dostring(ctl_table *table, int write, mutex_unlock(&nf_log_mutex); return -ENOENT; } - rcu_assign_pointer(nf_loggers[tindex], logger); + rcu_assign_pointer(net->nf.nf_loggers[tindex], logger); mutex_unlock(&nf_log_mutex); } else { mutex_lock(&nf_log_mutex); - logger = rcu_dereference_protected(nf_loggers[tindex], + logger = rcu_dereference_protected(net->nf.nf_loggers[tindex], lockdep_is_held(&nf_log_mutex)); if (!logger) table->data = "NONE"; @@ -260,49 +309,111 @@ static int nf_log_proc_dostring(ctl_table *table, int write, return r; } -static __init int netfilter_log_sysctl_init(void) +static int netfilter_log_sysctl_init(struct net *net) { int i; - - for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) { - snprintf(nf_log_sysctl_fnames[i-NFPROTO_UNSPEC], 3, "%d", i); - nf_log_sysctl_table[i].procname = - nf_log_sysctl_fnames[i-NFPROTO_UNSPEC]; - nf_log_sysctl_table[i].data = NULL; - nf_log_sysctl_table[i].maxlen = - NFLOGGER_NAME_LEN * sizeof(char); - nf_log_sysctl_table[i].mode = 0644; - nf_log_sysctl_table[i].proc_handler = nf_log_proc_dostring; - nf_log_sysctl_table[i].extra1 = (void *)(unsigned long) i; + struct ctl_table *table; + + table = nf_log_sysctl_table; + if (!net_eq(net, &init_net)) { + table = kmemdup(nf_log_sysctl_table, + sizeof(nf_log_sysctl_table), + GFP_KERNEL); + if (!table) + goto err_alloc; + } else { + for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) { + snprintf(nf_log_sysctl_fnames[i], + 3, "%d", i); + nf_log_sysctl_table[i].procname = + nf_log_sysctl_fnames[i]; + nf_log_sysctl_table[i].data = NULL; + nf_log_sysctl_table[i].maxlen = + NFLOGGER_NAME_LEN * sizeof(char); + nf_log_sysctl_table[i].mode = 0644; + nf_log_sysctl_table[i].proc_handler = + nf_log_proc_dostring; + nf_log_sysctl_table[i].extra1 = + (void *)(unsigned long) i; + } } - nf_log_dir_header = register_net_sysctl(&init_net, "net/netfilter/nf_log", - nf_log_sysctl_table); - if (!nf_log_dir_header) - return -ENOMEM; + net->nf.nf_log_dir_header = register_net_sysctl(net, + "net/netfilter/nf_log", + table); + if (!net->nf.nf_log_dir_header) + goto err_reg; return 0; + +err_reg: + if (!net_eq(net, &init_net)) + kfree(table); +err_alloc: + return -ENOMEM; +} + +static void netfilter_log_sysctl_exit(struct net *net) +{ + struct ctl_table *table; + + table = net->nf.nf_log_dir_header->ctl_table_arg; + unregister_net_sysctl_table(net->nf.nf_log_dir_header); + if (!net_eq(net, &init_net)) + kfree(table); } #else -static __init int netfilter_log_sysctl_init(void) +static int netfilter_log_sysctl_init(struct net *net) { return 0; } + +static void netfilter_log_sysctl_exit(struct net *net) +{ +} #endif /* CONFIG_SYSCTL */ -int __init netfilter_log_init(void) +static int __net_init nf_log_net_init(struct net *net) { - int i, r; + int ret = -ENOMEM; + #ifdef CONFIG_PROC_FS if (!proc_create("nf_log", S_IRUGO, - proc_net_netfilter, &nflog_file_ops)) - return -1; + net->nf.proc_netfilter, &nflog_file_ops)) + return ret; #endif + ret = netfilter_log_sysctl_init(net); + if (ret < 0) + goto out_sysctl; - /* Errors will trigger panic, unroll on error is unnecessary. */ - r = netfilter_log_sysctl_init(); - if (r < 0) - return r; + return 0; + +out_sysctl: + /* For init_net: errors will trigger panic, don't unroll on error. */ + if (!net_eq(net, &init_net)) + remove_proc_entry("nf_log", net->nf.proc_netfilter); + + return ret; +} + +static void __net_exit nf_log_net_exit(struct net *net) +{ + netfilter_log_sysctl_exit(net); + remove_proc_entry("nf_log", net->nf.proc_netfilter); +} + +static struct pernet_operations nf_log_net_ops = { + .init = nf_log_net_init, + .exit = nf_log_net_exit, +}; + +int __init netfilter_log_init(void) +{ + int i, ret; + + ret = register_pernet_subsys(&nf_log_net_ops); + if (ret < 0) + return ret; for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) INIT_LIST_HEAD(&(nf_loggers_l[i])); |