diff options
Diffstat (limited to 'net/netfilter/nf_log.c')
-rw-r--r-- | net/netfilter/nf_log.c | 201 |
1 files changed, 169 insertions, 32 deletions
diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c index fa8ae5d..8bb998f 100644 --- a/net/netfilter/nf_log.c +++ b/net/netfilter/nf_log.c @@ -14,58 +14,63 @@ LOG target modules */ #define NF_LOG_PREFIXLEN 128 +#define NFLOGGER_NAME_LEN 64 static const struct nf_logger *nf_loggers[NFPROTO_NUMPROTO] __read_mostly; +static struct list_head nf_loggers_l[NFPROTO_NUMPROTO] __read_mostly; static DEFINE_MUTEX(nf_log_mutex); -/* return EBUSY if somebody else is registered, EEXIST if the same logger - * is registred, 0 on success. */ -int nf_log_register(u_int8_t pf, const struct nf_logger *logger) +static struct nf_logger *__find_logger(int pf, const char *str_logger) { - int ret; + struct nf_logger *t; - if (pf >= ARRAY_SIZE(nf_loggers)) - return -EINVAL; - - /* Any setup of logging members must be done before - * substituting pointer. */ - ret = mutex_lock_interruptible(&nf_log_mutex); - if (ret < 0) - return ret; - - if (!nf_loggers[pf]) - rcu_assign_pointer(nf_loggers[pf], logger); - else if (nf_loggers[pf] == logger) - ret = -EEXIST; - else - ret = -EBUSY; + list_for_each_entry(t, &nf_loggers_l[pf], list[pf]) { + if (!strnicmp(str_logger, t->name, strlen(t->name))) + return t; + } - mutex_unlock(&nf_log_mutex); - return ret; + return NULL; } -EXPORT_SYMBOL(nf_log_register); -void nf_log_unregister_pf(u_int8_t pf) +/* return EEXIST if the same logger is registred, 0 on success. */ +int nf_log_register(u_int8_t pf, struct nf_logger *logger) { + const struct nf_logger *llog; + if (pf >= ARRAY_SIZE(nf_loggers)) - return; + return -EINVAL; + mutex_lock(&nf_log_mutex); - rcu_assign_pointer(nf_loggers[pf], NULL); + + if (pf == NFPROTO_UNSPEC) { + int i; + for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) + list_add_tail(&(logger->list[i]), &(nf_loggers_l[i])); + } else { + /* register at end of list to honor first register win */ + list_add_tail(&logger->list[pf], &nf_loggers_l[pf]); + llog = rcu_dereference(nf_loggers[pf]); + if (llog == NULL) + rcu_assign_pointer(nf_loggers[pf], logger); + } + mutex_unlock(&nf_log_mutex); - /* Give time to concurrent readers. */ - synchronize_rcu(); + return 0; } -EXPORT_SYMBOL(nf_log_unregister_pf); +EXPORT_SYMBOL(nf_log_register); -void nf_log_unregister(const struct nf_logger *logger) +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++) { - if (nf_loggers[i] == logger) + c_logger = rcu_dereference(nf_loggers[i]); + if (c_logger == logger) rcu_assign_pointer(nf_loggers[i], NULL); + list_del(&logger->list[i]); } mutex_unlock(&nf_log_mutex); @@ -73,6 +78,27 @@ void nf_log_unregister(const struct nf_logger *logger) } EXPORT_SYMBOL(nf_log_unregister); +int nf_log_bind_pf(u_int8_t pf, const struct nf_logger *logger) +{ + 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); + mutex_unlock(&nf_log_mutex); + return 0; +} +EXPORT_SYMBOL(nf_log_bind_pf); + +void nf_log_unbind_pf(u_int8_t pf) +{ + mutex_lock(&nf_log_mutex); + rcu_assign_pointer(nf_loggers[pf], NULL); + mutex_unlock(&nf_log_mutex); +} +EXPORT_SYMBOL(nf_log_unbind_pf); + void nf_log_packet(u_int8_t pf, unsigned int hooknum, const struct sk_buff *skb, @@ -129,13 +155,37 @@ static int seq_show(struct seq_file *s, void *v) { loff_t *pos = v; const struct nf_logger *logger; + struct nf_logger *t; + int ret; logger = rcu_dereference(nf_loggers[*pos]); if (!logger) - return seq_printf(s, "%2lld NONE\n", *pos); + ret = seq_printf(s, "%2lld NONE (", *pos); + else + ret = seq_printf(s, "%2lld %s (", *pos, logger->name); + + if (ret < 0) + return ret; + + mutex_lock(&nf_log_mutex); + list_for_each_entry(t, &nf_loggers_l[*pos], list[*pos]) { + ret = seq_printf(s, "%s", t->name); + if (ret < 0) { + mutex_unlock(&nf_log_mutex); + return ret; + } + if (&t->list[*pos] != nf_loggers_l[*pos].prev) { + ret = seq_printf(s, ","); + if (ret < 0) { + mutex_unlock(&nf_log_mutex); + return ret; + } + } + } + mutex_unlock(&nf_log_mutex); - return seq_printf(s, "%2lld %s\n", *pos, logger->name); + return seq_printf(s, ")\n"); } static const struct seq_operations nflog_seq_ops = { @@ -158,15 +208,102 @@ static const struct file_operations nflog_file_ops = { .release = seq_release, }; + #endif /* PROC_FS */ +#ifdef CONFIG_SYSCTL +struct ctl_path nf_log_sysctl_path[] = { + { .procname = "net", .ctl_name = CTL_NET, }, + { .procname = "netfilter", .ctl_name = NET_NETFILTER, }, + { .procname = "nf_log", .ctl_name = CTL_UNNUMBERED, }, + { } +}; + +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, struct file *filp, + void *buffer, size_t *lenp, loff_t *ppos) +{ + const struct nf_logger *logger; + int r = 0; + int tindex = (unsigned long)table->extra1; + + if (write) { + if (!strcmp(buffer, "NONE")) { + nf_log_unbind_pf(tindex); + return 0; + } + mutex_lock(&nf_log_mutex); + logger = __find_logger(tindex, buffer); + if (logger == NULL) { + mutex_unlock(&nf_log_mutex); + return -ENOENT; + } + rcu_assign_pointer(nf_loggers[tindex], logger); + mutex_unlock(&nf_log_mutex); + } else { + rcu_read_lock(); + logger = rcu_dereference(nf_loggers[tindex]); + if (!logger) + table->data = "NONE"; + else + table->data = logger->name; + r = proc_dostring(table, write, filp, buffer, lenp, ppos); + rcu_read_unlock(); + } + + return r; +} + +static __init int netfilter_log_sysctl_init(void) +{ + 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].ctl_name = CTL_UNNUMBERED; + 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; + } + + nf_log_dir_header = register_sysctl_paths(nf_log_sysctl_path, + nf_log_sysctl_table); + if (!nf_log_dir_header) + return -ENOMEM; + + return 0; +} +#else +static __init int netfilter_log_sysctl_init(void) +{ + return 0; +} +#endif /* CONFIG_SYSCTL */ int __init netfilter_log_init(void) { + int i, r; #ifdef CONFIG_PROC_FS if (!proc_create("nf_log", S_IRUGO, proc_net_netfilter, &nflog_file_ops)) return -1; #endif + + /* Errors will trigger panic, unroll on error is unnecessary. */ + r = netfilter_log_sysctl_init(); + if (r < 0) + return r; + + for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) + INIT_LIST_HEAD(&(nf_loggers_l[i])); + return 0; } |