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 |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 17 | #define NFLOGGER_NAME_LEN 64 |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 18 | |
Pablo Neira Ayuso | 5962815 | 2014-06-18 19:24:30 +0200 | [diff] [blame] | 19 | static struct nf_logger __rcu *loggers[NFPROTO_NUMPROTO][NF_LOG_TYPE_MAX] __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 | |
Marcelo Leitner | 0c26ed1 | 2014-10-29 10:04:51 -0200 | [diff] [blame] | 22 | #define nft_log_dereference(logger) \ |
| 23 | rcu_dereference_protected(logger, lockdep_is_held(&nf_log_mutex)) |
| 24 | |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 25 | static struct nf_logger *__find_logger(int pf, const char *str_logger) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 26 | { |
Pablo Neira Ayuso | 5962815 | 2014-06-18 19:24:30 +0200 | [diff] [blame] | 27 | struct nf_logger *log; |
| 28 | int i; |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 29 | |
Pablo Neira Ayuso | 5962815 | 2014-06-18 19:24:30 +0200 | [diff] [blame] | 30 | for (i = 0; i < NF_LOG_TYPE_MAX; i++) { |
| 31 | if (loggers[pf][i] == NULL) |
| 32 | continue; |
| 33 | |
Marcelo Leitner | 0c26ed1 | 2014-10-29 10:04:51 -0200 | [diff] [blame] | 34 | log = nft_log_dereference(loggers[pf][i]); |
Rasmus Villemoes | 1808274 | 2014-10-13 15:54:31 -0700 | [diff] [blame] | 35 | if (!strncasecmp(str_logger, log->name, strlen(log->name))) |
Pablo Neira Ayuso | 5962815 | 2014-06-18 19:24:30 +0200 | [diff] [blame] | 36 | return log; |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 37 | } |
| 38 | |
| 39 | return NULL; |
| 40 | } |
| 41 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 42 | void nf_log_set(struct net *net, u_int8_t pf, const struct nf_logger *logger) |
| 43 | { |
| 44 | const struct nf_logger *log; |
| 45 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 46 | if (pf == NFPROTO_UNSPEC) |
| 47 | return; |
| 48 | |
| 49 | mutex_lock(&nf_log_mutex); |
Marcelo Leitner | 0c26ed1 | 2014-10-29 10:04:51 -0200 | [diff] [blame] | 50 | log = nft_log_dereference(net->nf.nf_loggers[pf]); |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 51 | if (log == NULL) |
| 52 | rcu_assign_pointer(net->nf.nf_loggers[pf], logger); |
| 53 | |
| 54 | mutex_unlock(&nf_log_mutex); |
| 55 | } |
| 56 | EXPORT_SYMBOL(nf_log_set); |
| 57 | |
| 58 | void nf_log_unset(struct net *net, const struct nf_logger *logger) |
| 59 | { |
| 60 | int i; |
| 61 | const struct nf_logger *log; |
| 62 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 63 | mutex_lock(&nf_log_mutex); |
| 64 | for (i = 0; i < NFPROTO_NUMPROTO; i++) { |
Marcelo Leitner | 0c26ed1 | 2014-10-29 10:04:51 -0200 | [diff] [blame] | 65 | log = nft_log_dereference(net->nf.nf_loggers[i]); |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 66 | if (log == logger) |
| 67 | RCU_INIT_POINTER(net->nf.nf_loggers[i], NULL); |
| 68 | } |
| 69 | mutex_unlock(&nf_log_mutex); |
| 70 | synchronize_rcu(); |
| 71 | } |
| 72 | EXPORT_SYMBOL(nf_log_unset); |
| 73 | |
Adam Buchbinder | d93cf06 | 2012-09-19 21:47:58 -0400 | [diff] [blame] | 74 | /* return EEXIST if the same logger is registered, 0 on success. */ |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 75 | int nf_log_register(u_int8_t pf, struct nf_logger *logger) |
| 76 | { |
Eric Dumazet | b6f0a36 | 2009-04-15 12:16:19 +0200 | [diff] [blame] | 77 | int i; |
Marcelo Leitner | 8ac2bde | 2014-10-29 10:51:13 -0200 | [diff] [blame] | 78 | int ret = 0; |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 79 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 80 | if (pf >= ARRAY_SIZE(init_net.nf.nf_loggers)) |
Harald Welte | 8a61fad | 2005-08-09 20:23:53 -0700 | [diff] [blame] | 81 | return -EINVAL; |
| 82 | |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 83 | mutex_lock(&nf_log_mutex); |
Harald Welte | d72367b | 2005-08-09 20:23:36 -0700 | [diff] [blame] | 84 | |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 85 | if (pf == NFPROTO_UNSPEC) { |
Marcelo Leitner | 8ac2bde | 2014-10-29 10:51:13 -0200 | [diff] [blame] | 86 | for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) { |
| 87 | if (rcu_access_pointer(loggers[i][logger->type])) { |
| 88 | ret = -EEXIST; |
| 89 | goto unlock; |
| 90 | } |
| 91 | } |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 92 | for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) |
Pablo Neira Ayuso | 5962815 | 2014-06-18 19:24:30 +0200 | [diff] [blame] | 93 | rcu_assign_pointer(loggers[i][logger->type], logger); |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 94 | } else { |
Marcelo Leitner | 8ac2bde | 2014-10-29 10:51:13 -0200 | [diff] [blame] | 95 | if (rcu_access_pointer(loggers[pf][logger->type])) { |
| 96 | ret = -EEXIST; |
| 97 | goto unlock; |
| 98 | } |
Pablo Neira Ayuso | 5962815 | 2014-06-18 19:24:30 +0200 | [diff] [blame] | 99 | rcu_assign_pointer(loggers[pf][logger->type], logger); |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 100 | } |
Patrick McHardy | 9b73534 | 2007-02-12 11:11:39 -0800 | [diff] [blame] | 101 | |
Marcelo Leitner | 8ac2bde | 2014-10-29 10:51:13 -0200 | [diff] [blame] | 102 | unlock: |
Patrick McHardy | 9b73534 | 2007-02-12 11:11:39 -0800 | [diff] [blame] | 103 | mutex_unlock(&nf_log_mutex); |
Marcelo Leitner | 8ac2bde | 2014-10-29 10:51:13 -0200 | [diff] [blame] | 104 | return ret; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 105 | } |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 106 | EXPORT_SYMBOL(nf_log_register); |
| 107 | |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 108 | void nf_log_unregister(struct nf_logger *logger) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 109 | { |
Florian Westphal | 205ee117 | 2015-09-09 02:57:21 +0200 | [diff] [blame] | 110 | const struct nf_logger *log; |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 111 | int i; |
| 112 | |
Patrick McHardy | 9b73534 | 2007-02-12 11:11:39 -0800 | [diff] [blame] | 113 | mutex_lock(&nf_log_mutex); |
Florian Westphal | 205ee117 | 2015-09-09 02:57:21 +0200 | [diff] [blame] | 114 | for (i = 0; i < NFPROTO_NUMPROTO; i++) { |
| 115 | log = nft_log_dereference(loggers[i][logger->type]); |
| 116 | if (log == logger) |
| 117 | RCU_INIT_POINTER(loggers[i][logger->type], NULL); |
| 118 | } |
Patrick McHardy | 9b73534 | 2007-02-12 11:11:39 -0800 | [diff] [blame] | 119 | mutex_unlock(&nf_log_mutex); |
Pablo Neira Ayuso | ad5001c | 2015-09-17 13:37:00 +0200 | [diff] [blame^] | 120 | synchronize_rcu(); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 121 | } |
Patrick McHardy | e92ad99 | 2007-02-12 11:11:55 -0800 | [diff] [blame] | 122 | EXPORT_SYMBOL(nf_log_unregister); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 123 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 124 | int nf_log_bind_pf(struct net *net, u_int8_t pf, |
| 125 | const struct nf_logger *logger) |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 126 | { |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 127 | if (pf >= ARRAY_SIZE(net->nf.nf_loggers)) |
Jan Engelhardt | 9ef0298 | 2011-03-02 12:10:13 +0100 | [diff] [blame] | 128 | return -EINVAL; |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 129 | mutex_lock(&nf_log_mutex); |
| 130 | if (__find_logger(pf, logger->name) == NULL) { |
| 131 | mutex_unlock(&nf_log_mutex); |
| 132 | return -ENOENT; |
| 133 | } |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 134 | rcu_assign_pointer(net->nf.nf_loggers[pf], logger); |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 135 | mutex_unlock(&nf_log_mutex); |
| 136 | return 0; |
| 137 | } |
| 138 | EXPORT_SYMBOL(nf_log_bind_pf); |
| 139 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 140 | void nf_log_unbind_pf(struct net *net, u_int8_t pf) |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 141 | { |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 142 | if (pf >= ARRAY_SIZE(net->nf.nf_loggers)) |
Jan Engelhardt | 9ef0298 | 2011-03-02 12:10:13 +0100 | [diff] [blame] | 143 | return; |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 144 | mutex_lock(&nf_log_mutex); |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 145 | RCU_INIT_POINTER(net->nf.nf_loggers[pf], NULL); |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 146 | mutex_unlock(&nf_log_mutex); |
| 147 | } |
| 148 | EXPORT_SYMBOL(nf_log_unbind_pf); |
| 149 | |
Pablo Neira Ayuso | 960649d | 2014-06-23 00:28:18 +0200 | [diff] [blame] | 150 | void nf_logger_request_module(int pf, enum nf_log_type type) |
| 151 | { |
| 152 | if (loggers[pf][type] == NULL) |
| 153 | request_module("nf-logger-%u-%u", pf, type); |
| 154 | } |
| 155 | EXPORT_SYMBOL_GPL(nf_logger_request_module); |
| 156 | |
Pablo Neira Ayuso | fab4085 | 2014-06-18 19:38:25 +0200 | [diff] [blame] | 157 | int nf_logger_find_get(int pf, enum nf_log_type type) |
| 158 | { |
| 159 | struct nf_logger *logger; |
| 160 | int ret = -ENOENT; |
| 161 | |
Pablo Neira Ayuso | c5a589c | 2014-10-30 18:39:12 +0100 | [diff] [blame] | 162 | if (rcu_access_pointer(loggers[pf][type]) == NULL) |
Pablo Neira Ayuso | fab4085 | 2014-06-18 19:38:25 +0200 | [diff] [blame] | 163 | request_module("nf-logger-%u-%u", pf, type); |
| 164 | |
| 165 | rcu_read_lock(); |
| 166 | logger = rcu_dereference(loggers[pf][type]); |
| 167 | if (logger == NULL) |
| 168 | goto out; |
| 169 | |
| 170 | if (logger && try_module_get(logger->me)) |
| 171 | ret = 0; |
| 172 | out: |
| 173 | rcu_read_unlock(); |
| 174 | return ret; |
| 175 | } |
| 176 | EXPORT_SYMBOL_GPL(nf_logger_find_get); |
| 177 | |
| 178 | void nf_logger_put(int pf, enum nf_log_type type) |
| 179 | { |
| 180 | struct nf_logger *logger; |
| 181 | |
| 182 | BUG_ON(loggers[pf][type] == NULL); |
| 183 | |
| 184 | rcu_read_lock(); |
| 185 | logger = rcu_dereference(loggers[pf][type]); |
| 186 | module_put(logger->me); |
| 187 | rcu_read_unlock(); |
| 188 | } |
| 189 | EXPORT_SYMBOL_GPL(nf_logger_put); |
| 190 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 191 | void nf_log_packet(struct net *net, |
| 192 | u_int8_t pf, |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 193 | unsigned int hooknum, |
| 194 | const struct sk_buff *skb, |
| 195 | const struct net_device *in, |
| 196 | const struct net_device *out, |
Patrick McHardy | 7b2f963 | 2007-12-17 22:39:08 -0800 | [diff] [blame] | 197 | const struct nf_loginfo *loginfo, |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 198 | const char *fmt, ...) |
| 199 | { |
| 200 | va_list args; |
| 201 | char prefix[NF_LOG_PREFIXLEN]; |
Patrick McHardy | 7b2f963 | 2007-12-17 22:39:08 -0800 | [diff] [blame] | 202 | const struct nf_logger *logger; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 203 | |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 204 | rcu_read_lock(); |
Pablo Neira Ayuso | fab4085 | 2014-06-18 19:38:25 +0200 | [diff] [blame] | 205 | if (loginfo != NULL) |
| 206 | logger = rcu_dereference(loggers[pf][loginfo->type]); |
| 207 | else |
| 208 | logger = rcu_dereference(net->nf.nf_loggers[pf]); |
| 209 | |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 210 | if (logger) { |
| 211 | va_start(args, fmt); |
| 212 | vsnprintf(prefix, sizeof(prefix), fmt, args); |
| 213 | va_end(args); |
Hans Schillstrom | 8cdb46d | 2013-05-15 01:23:45 +0000 | [diff] [blame] | 214 | logger->logfn(net, pf, hooknum, skb, in, out, loginfo, prefix); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 215 | } |
| 216 | rcu_read_unlock(); |
| 217 | } |
| 218 | EXPORT_SYMBOL(nf_log_packet); |
| 219 | |
Pablo Neira Ayuso | 4017a7e | 2015-03-02 01:10:28 +0100 | [diff] [blame] | 220 | void nf_log_trace(struct net *net, |
| 221 | u_int8_t pf, |
| 222 | unsigned int hooknum, |
| 223 | const struct sk_buff *skb, |
| 224 | const struct net_device *in, |
| 225 | const struct net_device *out, |
| 226 | const struct nf_loginfo *loginfo, const char *fmt, ...) |
| 227 | { |
| 228 | va_list args; |
| 229 | char prefix[NF_LOG_PREFIXLEN]; |
| 230 | const struct nf_logger *logger; |
| 231 | |
| 232 | rcu_read_lock(); |
| 233 | logger = rcu_dereference(net->nf.nf_loggers[pf]); |
| 234 | if (logger) { |
| 235 | va_start(args, fmt); |
| 236 | vsnprintf(prefix, sizeof(prefix), fmt, args); |
| 237 | va_end(args); |
| 238 | logger->logfn(net, pf, hooknum, skb, in, out, loginfo, prefix); |
| 239 | } |
| 240 | rcu_read_unlock(); |
| 241 | } |
| 242 | EXPORT_SYMBOL(nf_log_trace); |
| 243 | |
Pablo Neira Ayuso | 27fd8d90 | 2014-06-19 12:37:58 +0200 | [diff] [blame] | 244 | #define S_SIZE (1024 - (sizeof(unsigned int) + 1)) |
| 245 | |
| 246 | struct nf_log_buf { |
| 247 | unsigned int count; |
| 248 | char buf[S_SIZE + 1]; |
| 249 | }; |
| 250 | static struct nf_log_buf emergency, *emergency_ptr = &emergency; |
| 251 | |
| 252 | __printf(2, 3) int nf_log_buf_add(struct nf_log_buf *m, const char *f, ...) |
| 253 | { |
| 254 | va_list args; |
| 255 | int len; |
| 256 | |
| 257 | if (likely(m->count < S_SIZE)) { |
| 258 | va_start(args, f); |
| 259 | len = vsnprintf(m->buf + m->count, S_SIZE - m->count, f, args); |
| 260 | va_end(args); |
| 261 | if (likely(m->count + len < S_SIZE)) { |
| 262 | m->count += len; |
| 263 | return 0; |
| 264 | } |
| 265 | } |
| 266 | m->count = S_SIZE; |
| 267 | printk_once(KERN_ERR KBUILD_MODNAME " please increase S_SIZE\n"); |
| 268 | return -1; |
| 269 | } |
| 270 | EXPORT_SYMBOL_GPL(nf_log_buf_add); |
| 271 | |
| 272 | struct nf_log_buf *nf_log_buf_open(void) |
| 273 | { |
| 274 | struct nf_log_buf *m = kmalloc(sizeof(*m), GFP_ATOMIC); |
| 275 | |
| 276 | if (unlikely(!m)) { |
| 277 | local_bh_disable(); |
| 278 | do { |
| 279 | m = xchg(&emergency_ptr, NULL); |
| 280 | } while (!m); |
| 281 | } |
| 282 | m->count = 0; |
| 283 | return m; |
| 284 | } |
| 285 | EXPORT_SYMBOL_GPL(nf_log_buf_open); |
| 286 | |
| 287 | void nf_log_buf_close(struct nf_log_buf *m) |
| 288 | { |
| 289 | m->buf[m->count] = 0; |
| 290 | printk("%s\n", m->buf); |
| 291 | |
| 292 | if (likely(m != &emergency)) |
| 293 | kfree(m); |
| 294 | else { |
| 295 | emergency_ptr = m; |
| 296 | local_bh_enable(); |
| 297 | } |
| 298 | } |
| 299 | EXPORT_SYMBOL_GPL(nf_log_buf_close); |
| 300 | |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 301 | #ifdef CONFIG_PROC_FS |
| 302 | static void *seq_start(struct seq_file *seq, loff_t *pos) |
| 303 | { |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 304 | struct net *net = seq_file_net(seq); |
| 305 | |
Patrick McHardy | 6440fe0 | 2009-11-19 04:59:05 +0000 | [diff] [blame] | 306 | mutex_lock(&nf_log_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 307 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 308 | if (*pos >= ARRAY_SIZE(net->nf.nf_loggers)) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 309 | return NULL; |
| 310 | |
| 311 | return pos; |
| 312 | } |
| 313 | |
| 314 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 315 | { |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 316 | struct net *net = seq_file_net(s); |
| 317 | |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 318 | (*pos)++; |
| 319 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 320 | if (*pos >= ARRAY_SIZE(net->nf.nf_loggers)) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 321 | return NULL; |
| 322 | |
| 323 | return pos; |
| 324 | } |
| 325 | |
| 326 | static void seq_stop(struct seq_file *s, void *v) |
| 327 | { |
Patrick McHardy | 6440fe0 | 2009-11-19 04:59:05 +0000 | [diff] [blame] | 328 | mutex_unlock(&nf_log_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 329 | } |
| 330 | |
| 331 | static int seq_show(struct seq_file *s, void *v) |
| 332 | { |
| 333 | loff_t *pos = v; |
| 334 | const struct nf_logger *logger; |
Steven Rostedt (Red Hat) | e71456a | 2014-10-27 17:43:45 -0400 | [diff] [blame] | 335 | int i; |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 336 | struct net *net = seq_file_net(s); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 337 | |
Marcelo Leitner | 0c26ed1 | 2014-10-29 10:04:51 -0200 | [diff] [blame] | 338 | logger = nft_log_dereference(net->nf.nf_loggers[*pos]); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 339 | |
| 340 | if (!logger) |
Steven Rostedt (Red Hat) | e71456a | 2014-10-27 17:43:45 -0400 | [diff] [blame] | 341 | seq_printf(s, "%2lld NONE (", *pos); |
Eric Leblond | c7a913c | 2009-03-16 14:55:27 +0100 | [diff] [blame] | 342 | else |
Steven Rostedt (Red Hat) | e71456a | 2014-10-27 17:43:45 -0400 | [diff] [blame] | 343 | seq_printf(s, "%2lld %s (", *pos, logger->name); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 344 | |
Steven Rostedt (Red Hat) | e71456a | 2014-10-27 17:43:45 -0400 | [diff] [blame] | 345 | if (seq_has_overflowed(s)) |
| 346 | return -ENOSPC; |
Eric Leblond | c7a913c | 2009-03-16 14:55:27 +0100 | [diff] [blame] | 347 | |
Pablo Neira Ayuso | 5962815 | 2014-06-18 19:24:30 +0200 | [diff] [blame] | 348 | for (i = 0; i < NF_LOG_TYPE_MAX; i++) { |
| 349 | if (loggers[*pos][i] == NULL) |
| 350 | continue; |
| 351 | |
Marcelo Leitner | 0c26ed1 | 2014-10-29 10:04:51 -0200 | [diff] [blame] | 352 | logger = nft_log_dereference(loggers[*pos][i]); |
Steven Rostedt (Red Hat) | e71456a | 2014-10-27 17:43:45 -0400 | [diff] [blame] | 353 | seq_printf(s, "%s", logger->name); |
| 354 | if (i == 0 && loggers[*pos][i + 1] != NULL) |
| 355 | seq_printf(s, ","); |
| 356 | |
| 357 | if (seq_has_overflowed(s)) |
| 358 | return -ENOSPC; |
Eric Leblond | c7a913c | 2009-03-16 14:55:27 +0100 | [diff] [blame] | 359 | } |
Eric Leblond | c7a913c | 2009-03-16 14:55:27 +0100 | [diff] [blame] | 360 | |
Steven Rostedt (Red Hat) | e71456a | 2014-10-27 17:43:45 -0400 | [diff] [blame] | 361 | seq_printf(s, ")\n"); |
| 362 | |
| 363 | if (seq_has_overflowed(s)) |
| 364 | return -ENOSPC; |
| 365 | return 0; |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 366 | } |
| 367 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 368 | static const struct seq_operations nflog_seq_ops = { |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 369 | .start = seq_start, |
| 370 | .next = seq_next, |
| 371 | .stop = seq_stop, |
| 372 | .show = seq_show, |
| 373 | }; |
| 374 | |
| 375 | static int nflog_open(struct inode *inode, struct file *file) |
| 376 | { |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 377 | return seq_open_net(inode, file, &nflog_seq_ops, |
| 378 | sizeof(struct seq_net_private)); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 379 | } |
| 380 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 381 | static const struct file_operations nflog_file_ops = { |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 382 | .owner = THIS_MODULE, |
| 383 | .open = nflog_open, |
| 384 | .read = seq_read, |
| 385 | .llseek = seq_lseek, |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 386 | .release = seq_release_net, |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 387 | }; |
| 388 | |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 389 | |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 390 | #endif /* PROC_FS */ |
| 391 | |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 392 | #ifdef CONFIG_SYSCTL |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 393 | static char nf_log_sysctl_fnames[NFPROTO_NUMPROTO-NFPROTO_UNSPEC][3]; |
| 394 | static struct ctl_table nf_log_sysctl_table[NFPROTO_NUMPROTO+1]; |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 395 | |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame] | 396 | static int nf_log_proc_dostring(struct ctl_table *table, int write, |
Patrick McHardy | 2495561 | 2009-06-22 14:15:30 +0200 | [diff] [blame] | 397 | void __user *buffer, size_t *lenp, loff_t *ppos) |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 398 | { |
| 399 | const struct nf_logger *logger; |
Patrick McHardy | 2495561 | 2009-06-22 14:15:30 +0200 | [diff] [blame] | 400 | char buf[NFLOGGER_NAME_LEN]; |
| 401 | size_t size = *lenp; |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 402 | int r = 0; |
| 403 | int tindex = (unsigned long)table->extra1; |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 404 | struct net *net = current->nsproxy->net_ns; |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 405 | |
| 406 | if (write) { |
Patrick McHardy | 2495561 | 2009-06-22 14:15:30 +0200 | [diff] [blame] | 407 | if (size > sizeof(buf)) |
| 408 | size = sizeof(buf); |
| 409 | if (copy_from_user(buf, buffer, size)) |
| 410 | return -EFAULT; |
| 411 | |
| 412 | if (!strcmp(buf, "NONE")) { |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 413 | nf_log_unbind_pf(net, tindex); |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 414 | return 0; |
| 415 | } |
| 416 | mutex_lock(&nf_log_mutex); |
Patrick McHardy | 2495561 | 2009-06-22 14:15:30 +0200 | [diff] [blame] | 417 | logger = __find_logger(tindex, buf); |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 418 | if (logger == NULL) { |
| 419 | mutex_unlock(&nf_log_mutex); |
| 420 | return -ENOENT; |
| 421 | } |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 422 | rcu_assign_pointer(net->nf.nf_loggers[tindex], logger); |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 423 | mutex_unlock(&nf_log_mutex); |
| 424 | } else { |
Patrick McHardy | 266d07c | 2009-06-13 12:21:10 +0200 | [diff] [blame] | 425 | mutex_lock(&nf_log_mutex); |
Marcelo Leitner | 0c26ed1 | 2014-10-29 10:04:51 -0200 | [diff] [blame] | 426 | logger = nft_log_dereference(net->nf.nf_loggers[tindex]); |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 427 | if (!logger) |
| 428 | table->data = "NONE"; |
| 429 | else |
| 430 | table->data = logger->name; |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 431 | r = proc_dostring(table, write, buffer, lenp, ppos); |
Patrick McHardy | 266d07c | 2009-06-13 12:21:10 +0200 | [diff] [blame] | 432 | mutex_unlock(&nf_log_mutex); |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 433 | } |
| 434 | |
| 435 | return r; |
| 436 | } |
| 437 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 438 | static int netfilter_log_sysctl_init(struct net *net) |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 439 | { |
| 440 | int i; |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 441 | struct ctl_table *table; |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 442 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 443 | table = nf_log_sysctl_table; |
| 444 | if (!net_eq(net, &init_net)) { |
| 445 | table = kmemdup(nf_log_sysctl_table, |
| 446 | sizeof(nf_log_sysctl_table), |
| 447 | GFP_KERNEL); |
| 448 | if (!table) |
| 449 | goto err_alloc; |
| 450 | } else { |
| 451 | for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) { |
| 452 | snprintf(nf_log_sysctl_fnames[i], |
| 453 | 3, "%d", i); |
| 454 | nf_log_sysctl_table[i].procname = |
| 455 | nf_log_sysctl_fnames[i]; |
| 456 | nf_log_sysctl_table[i].data = NULL; |
Fabian Frederick | 8aefc4d | 2014-12-22 19:36:15 +0100 | [diff] [blame] | 457 | nf_log_sysctl_table[i].maxlen = NFLOGGER_NAME_LEN; |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 458 | nf_log_sysctl_table[i].mode = 0644; |
| 459 | nf_log_sysctl_table[i].proc_handler = |
| 460 | nf_log_proc_dostring; |
| 461 | nf_log_sysctl_table[i].extra1 = |
| 462 | (void *)(unsigned long) i; |
| 463 | } |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 464 | } |
| 465 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 466 | net->nf.nf_log_dir_header = register_net_sysctl(net, |
| 467 | "net/netfilter/nf_log", |
| 468 | table); |
| 469 | if (!net->nf.nf_log_dir_header) |
| 470 | goto err_reg; |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 471 | |
| 472 | return 0; |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 473 | |
| 474 | err_reg: |
| 475 | if (!net_eq(net, &init_net)) |
| 476 | kfree(table); |
| 477 | err_alloc: |
| 478 | return -ENOMEM; |
| 479 | } |
| 480 | |
| 481 | static void netfilter_log_sysctl_exit(struct net *net) |
| 482 | { |
| 483 | struct ctl_table *table; |
| 484 | |
| 485 | table = net->nf.nf_log_dir_header->ctl_table_arg; |
| 486 | unregister_net_sysctl_table(net->nf.nf_log_dir_header); |
| 487 | if (!net_eq(net, &init_net)) |
| 488 | kfree(table); |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 489 | } |
| 490 | #else |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 491 | static int netfilter_log_sysctl_init(struct net *net) |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 492 | { |
| 493 | return 0; |
| 494 | } |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 495 | |
| 496 | static void netfilter_log_sysctl_exit(struct net *net) |
| 497 | { |
| 498 | } |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 499 | #endif /* CONFIG_SYSCTL */ |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 500 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 501 | static int __net_init nf_log_net_init(struct net *net) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 502 | { |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 503 | int ret = -ENOMEM; |
| 504 | |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 505 | #ifdef CONFIG_PROC_FS |
Denis V. Lunev | 8eeee8b | 2008-03-27 16:55:53 -0700 | [diff] [blame] | 506 | if (!proc_create("nf_log", S_IRUGO, |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 507 | net->nf.proc_netfilter, &nflog_file_ops)) |
| 508 | return ret; |
Harald Welte | 6224392 | 2005-08-11 15:30:45 -0700 | [diff] [blame] | 509 | #endif |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 510 | ret = netfilter_log_sysctl_init(net); |
| 511 | if (ret < 0) |
| 512 | goto out_sysctl; |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 513 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 514 | return 0; |
| 515 | |
| 516 | out_sysctl: |
Pablo Neira Ayuso | e778f56 | 2013-04-30 08:01:18 +0000 | [diff] [blame] | 517 | #ifdef CONFIG_PROC_FS |
Pablo Neira Ayuso | 6d11cfd | 2013-05-22 22:42:36 +0000 | [diff] [blame] | 518 | remove_proc_entry("nf_log", net->nf.proc_netfilter); |
Pablo Neira Ayuso | e778f56 | 2013-04-30 08:01:18 +0000 | [diff] [blame] | 519 | #endif |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 520 | return ret; |
| 521 | } |
| 522 | |
| 523 | static void __net_exit nf_log_net_exit(struct net *net) |
| 524 | { |
| 525 | netfilter_log_sysctl_exit(net); |
Pablo Neira Ayuso | e778f56 | 2013-04-30 08:01:18 +0000 | [diff] [blame] | 526 | #ifdef CONFIG_PROC_FS |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 527 | remove_proc_entry("nf_log", net->nf.proc_netfilter); |
Pablo Neira Ayuso | e778f56 | 2013-04-30 08:01:18 +0000 | [diff] [blame] | 528 | #endif |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 529 | } |
| 530 | |
| 531 | static struct pernet_operations nf_log_net_ops = { |
| 532 | .init = nf_log_net_init, |
| 533 | .exit = nf_log_net_exit, |
| 534 | }; |
| 535 | |
| 536 | int __init netfilter_log_init(void) |
| 537 | { |
Pablo Neira Ayuso | 5962815 | 2014-06-18 19:24:30 +0200 | [diff] [blame] | 538 | return register_pernet_subsys(&nf_log_net_ops); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 539 | } |