Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 1 | #include <linux/kernel.h> |
| 2 | #include <linux/init.h> |
| 3 | #include <linux/module.h> |
| 4 | #include <linux/proc_fs.h> |
| 5 | #include <linux/skbuff.h> |
| 6 | #include <linux/netfilter.h> |
Harald Welte | bbd86b9f | 2005-08-09 20:23:11 -0700 | [diff] [blame] | 7 | #include <linux/seq_file.h> |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 8 | #include <net/protocol.h> |
Patrick McHardy | f01ffbd | 2007-12-17 22:38:49 -0800 | [diff] [blame] | 9 | #include <net/netfilter/nf_log.h> |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 10 | |
| 11 | #include "nf_internals.h" |
| 12 | |
YOSHIFUJI Hideaki | a5d2926 | 2007-07-19 10:44:21 +0900 | [diff] [blame] | 13 | /* Internal logging interface, which relies on the real |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 14 | LOG target modules */ |
| 15 | |
| 16 | #define NF_LOG_PREFIXLEN 128 |
| 17 | |
Jan Engelhardt | 7e9c6ee | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 18 | static const struct nf_logger *nf_loggers[NFPROTO_NUMPROTO] __read_mostly; |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame^] | 19 | static struct list_head nf_loggers_l[NFPROTO_NUMPROTO] __read_mostly; |
Patrick McHardy | 9b73534 | 2007-02-12 11:11:39 -0800 | [diff] [blame] | 20 | static DEFINE_MUTEX(nf_log_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 21 | |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame^] | 22 | static struct nf_logger *__find_logger(int pf, const char *str_logger) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 23 | { |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame^] | 24 | struct nf_logger *t; |
| 25 | |
| 26 | list_for_each_entry(t, &nf_loggers_l[pf], list[pf]) { |
| 27 | if (!strnicmp(str_logger, t->name, strlen(t->name))) |
| 28 | return t; |
| 29 | } |
| 30 | |
| 31 | return NULL; |
| 32 | } |
| 33 | |
| 34 | /* return EEXIST if the same logger is registred, 0 on success. */ |
| 35 | int nf_log_register(u_int8_t pf, struct nf_logger *logger) |
| 36 | { |
| 37 | const struct nf_logger *llog; |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 38 | |
Jan Engelhardt | 7e9c6ee | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 39 | if (pf >= ARRAY_SIZE(nf_loggers)) |
Harald Welte | 8a61fad | 2005-08-09 20:23:53 -0700 | [diff] [blame] | 40 | return -EINVAL; |
| 41 | |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame^] | 42 | mutex_lock(&nf_log_mutex); |
Harald Welte | d72367b | 2005-08-09 20:23:36 -0700 | [diff] [blame] | 43 | |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame^] | 44 | if (pf == NFPROTO_UNSPEC) { |
| 45 | int i; |
| 46 | for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) |
| 47 | list_add_tail(&(logger->list[i]), &(nf_loggers_l[i])); |
| 48 | } else { |
| 49 | /* register at end of list to honor first register win */ |
| 50 | list_add_tail(&logger->list[pf], &nf_loggers_l[pf]); |
| 51 | llog = rcu_dereference(nf_loggers[pf]); |
| 52 | if (llog == NULL) |
| 53 | rcu_assign_pointer(nf_loggers[pf], logger); |
| 54 | } |
Patrick McHardy | 9b73534 | 2007-02-12 11:11:39 -0800 | [diff] [blame] | 55 | |
| 56 | mutex_unlock(&nf_log_mutex); |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame^] | 57 | |
| 58 | return 0; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 59 | } |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 60 | EXPORT_SYMBOL(nf_log_register); |
| 61 | |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame^] | 62 | void nf_log_unregister(struct nf_logger *logger) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 63 | { |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame^] | 64 | const struct nf_logger *c_logger; |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 65 | int i; |
| 66 | |
Patrick McHardy | 9b73534 | 2007-02-12 11:11:39 -0800 | [diff] [blame] | 67 | mutex_lock(&nf_log_mutex); |
Jan Engelhardt | 7e9c6ee | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 68 | for (i = 0; i < ARRAY_SIZE(nf_loggers); i++) { |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame^] | 69 | c_logger = rcu_dereference(nf_loggers[i]); |
| 70 | if (c_logger == logger) |
Patrick McHardy | e92ad99 | 2007-02-12 11:11:55 -0800 | [diff] [blame] | 71 | rcu_assign_pointer(nf_loggers[i], NULL); |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame^] | 72 | list_del(&logger->list[i]); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 73 | } |
Patrick McHardy | 9b73534 | 2007-02-12 11:11:39 -0800 | [diff] [blame] | 74 | mutex_unlock(&nf_log_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 75 | |
Patrick McHardy | a5ea6169 | 2007-02-12 11:11:06 -0800 | [diff] [blame] | 76 | synchronize_rcu(); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 77 | } |
Patrick McHardy | e92ad99 | 2007-02-12 11:11:55 -0800 | [diff] [blame] | 78 | EXPORT_SYMBOL(nf_log_unregister); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 79 | |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame^] | 80 | int nf_log_bind_pf(u_int8_t pf, const struct nf_logger *logger) |
| 81 | { |
| 82 | mutex_lock(&nf_log_mutex); |
| 83 | if (__find_logger(pf, logger->name) == NULL) { |
| 84 | mutex_unlock(&nf_log_mutex); |
| 85 | return -ENOENT; |
| 86 | } |
| 87 | rcu_assign_pointer(nf_loggers[pf], logger); |
| 88 | mutex_unlock(&nf_log_mutex); |
| 89 | return 0; |
| 90 | } |
| 91 | EXPORT_SYMBOL(nf_log_bind_pf); |
| 92 | |
| 93 | void nf_log_unbind_pf(u_int8_t pf) |
| 94 | { |
| 95 | mutex_lock(&nf_log_mutex); |
| 96 | rcu_assign_pointer(nf_loggers[pf], NULL); |
| 97 | mutex_unlock(&nf_log_mutex); |
| 98 | } |
| 99 | EXPORT_SYMBOL(nf_log_unbind_pf); |
| 100 | |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 101 | void nf_log_packet(u_int8_t pf, |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 102 | unsigned int hooknum, |
| 103 | const struct sk_buff *skb, |
| 104 | const struct net_device *in, |
| 105 | const struct net_device *out, |
Patrick McHardy | 7b2f963 | 2007-12-17 22:39:08 -0800 | [diff] [blame] | 106 | const struct nf_loginfo *loginfo, |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 107 | const char *fmt, ...) |
| 108 | { |
| 109 | va_list args; |
| 110 | char prefix[NF_LOG_PREFIXLEN]; |
Patrick McHardy | 7b2f963 | 2007-12-17 22:39:08 -0800 | [diff] [blame] | 111 | const struct nf_logger *logger; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 112 | |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 113 | rcu_read_lock(); |
Patrick McHardy | e92ad99 | 2007-02-12 11:11:55 -0800 | [diff] [blame] | 114 | logger = rcu_dereference(nf_loggers[pf]); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 115 | if (logger) { |
| 116 | va_start(args, fmt); |
| 117 | vsnprintf(prefix, sizeof(prefix), fmt, args); |
| 118 | va_end(args); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 119 | logger->logfn(pf, hooknum, skb, in, out, loginfo, prefix); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 120 | } |
| 121 | rcu_read_unlock(); |
| 122 | } |
| 123 | EXPORT_SYMBOL(nf_log_packet); |
| 124 | |
| 125 | #ifdef CONFIG_PROC_FS |
| 126 | static void *seq_start(struct seq_file *seq, loff_t *pos) |
Eric Dumazet | ca7c48c | 2008-01-31 03:53:27 -0800 | [diff] [blame] | 127 | __acquires(RCU) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 128 | { |
| 129 | rcu_read_lock(); |
| 130 | |
Jan Engelhardt | 7e9c6ee | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 131 | if (*pos >= ARRAY_SIZE(nf_loggers)) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 132 | return NULL; |
| 133 | |
| 134 | return pos; |
| 135 | } |
| 136 | |
| 137 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 138 | { |
| 139 | (*pos)++; |
| 140 | |
Jan Engelhardt | 7e9c6ee | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 141 | if (*pos >= ARRAY_SIZE(nf_loggers)) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 142 | return NULL; |
| 143 | |
| 144 | return pos; |
| 145 | } |
| 146 | |
| 147 | static void seq_stop(struct seq_file *s, void *v) |
Eric Dumazet | ca7c48c | 2008-01-31 03:53:27 -0800 | [diff] [blame] | 148 | __releases(RCU) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 149 | { |
| 150 | rcu_read_unlock(); |
| 151 | } |
| 152 | |
| 153 | static int seq_show(struct seq_file *s, void *v) |
| 154 | { |
| 155 | loff_t *pos = v; |
| 156 | const struct nf_logger *logger; |
| 157 | |
Patrick McHardy | e92ad99 | 2007-02-12 11:11:55 -0800 | [diff] [blame] | 158 | logger = rcu_dereference(nf_loggers[*pos]); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 159 | |
| 160 | if (!logger) |
| 161 | return seq_printf(s, "%2lld NONE\n", *pos); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 162 | |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 163 | return seq_printf(s, "%2lld %s\n", *pos, logger->name); |
| 164 | } |
| 165 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 166 | static const struct seq_operations nflog_seq_ops = { |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 167 | .start = seq_start, |
| 168 | .next = seq_next, |
| 169 | .stop = seq_stop, |
| 170 | .show = seq_show, |
| 171 | }; |
| 172 | |
| 173 | static int nflog_open(struct inode *inode, struct file *file) |
| 174 | { |
| 175 | return seq_open(file, &nflog_seq_ops); |
| 176 | } |
| 177 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 178 | static const struct file_operations nflog_file_ops = { |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 179 | .owner = THIS_MODULE, |
| 180 | .open = nflog_open, |
| 181 | .read = seq_read, |
| 182 | .llseek = seq_lseek, |
| 183 | .release = seq_release, |
| 184 | }; |
| 185 | |
| 186 | #endif /* PROC_FS */ |
| 187 | |
| 188 | |
| 189 | int __init netfilter_log_init(void) |
| 190 | { |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame^] | 191 | int i; |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 192 | #ifdef CONFIG_PROC_FS |
Denis V. Lunev | 8eeee8b | 2008-03-27 16:55:53 -0700 | [diff] [blame] | 193 | if (!proc_create("nf_log", S_IRUGO, |
| 194 | proc_net_netfilter, &nflog_file_ops)) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 195 | return -1; |
Harald Welte | 6224392 | 2005-08-11 15:30:45 -0700 | [diff] [blame] | 196 | #endif |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame^] | 197 | |
| 198 | for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) |
| 199 | INIT_LIST_HEAD(&(nf_loggers_l[i])); |
| 200 | |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 201 | return 0; |
| 202 | } |