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 | |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 16 | #define NFLOGGER_NAME_LEN 64 |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 17 | |
Pablo Neira Ayuso | 5962815 | 2014-06-18 19:24:30 +0200 | [diff] [blame] | 18 | 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] | 19 | static DEFINE_MUTEX(nf_log_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 20 | |
Marcelo Leitner | 0c26ed1 | 2014-10-29 10:04:51 -0200 | [diff] [blame] | 21 | #define nft_log_dereference(logger) \ |
| 22 | rcu_dereference_protected(logger, lockdep_is_held(&nf_log_mutex)) |
| 23 | |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 24 | static struct nf_logger *__find_logger(int pf, const char *str_logger) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 25 | { |
Pablo Neira Ayuso | 5962815 | 2014-06-18 19:24:30 +0200 | [diff] [blame] | 26 | struct nf_logger *log; |
| 27 | int i; |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 28 | |
Pablo Neira Ayuso | 5962815 | 2014-06-18 19:24:30 +0200 | [diff] [blame] | 29 | for (i = 0; i < NF_LOG_TYPE_MAX; i++) { |
| 30 | if (loggers[pf][i] == NULL) |
| 31 | continue; |
| 32 | |
Marcelo Leitner | 0c26ed1 | 2014-10-29 10:04:51 -0200 | [diff] [blame] | 33 | log = nft_log_dereference(loggers[pf][i]); |
Rasmus Villemoes | 1808274 | 2014-10-13 15:54:31 -0700 | [diff] [blame] | 34 | if (!strncasecmp(str_logger, log->name, strlen(log->name))) |
Pablo Neira Ayuso | 5962815 | 2014-06-18 19:24:30 +0200 | [diff] [blame] | 35 | return log; |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 36 | } |
| 37 | |
| 38 | return NULL; |
| 39 | } |
| 40 | |
Gao Feng | 779994f | 2016-08-29 18:25:28 +0800 | [diff] [blame] | 41 | int nf_log_set(struct net *net, u_int8_t pf, const struct nf_logger *logger) |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 42 | { |
| 43 | const struct nf_logger *log; |
| 44 | |
Gao Feng | 779994f | 2016-08-29 18:25:28 +0800 | [diff] [blame] | 45 | if (pf == NFPROTO_UNSPEC || pf >= ARRAY_SIZE(net->nf.nf_loggers)) |
| 46 | return -EOPNOTSUPP; |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 47 | |
| 48 | mutex_lock(&nf_log_mutex); |
Marcelo Leitner | 0c26ed1 | 2014-10-29 10:04:51 -0200 | [diff] [blame] | 49 | log = nft_log_dereference(net->nf.nf_loggers[pf]); |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 50 | if (log == NULL) |
| 51 | rcu_assign_pointer(net->nf.nf_loggers[pf], logger); |
| 52 | |
| 53 | mutex_unlock(&nf_log_mutex); |
Gao Feng | 779994f | 2016-08-29 18:25:28 +0800 | [diff] [blame] | 54 | |
| 55 | return 0; |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 56 | } |
| 57 | EXPORT_SYMBOL(nf_log_set); |
| 58 | |
| 59 | void nf_log_unset(struct net *net, const struct nf_logger *logger) |
| 60 | { |
| 61 | int i; |
| 62 | const struct nf_logger *log; |
| 63 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 64 | mutex_lock(&nf_log_mutex); |
| 65 | for (i = 0; i < NFPROTO_NUMPROTO; i++) { |
Marcelo Leitner | 0c26ed1 | 2014-10-29 10:04:51 -0200 | [diff] [blame] | 66 | log = nft_log_dereference(net->nf.nf_loggers[i]); |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 67 | if (log == logger) |
| 68 | RCU_INIT_POINTER(net->nf.nf_loggers[i], NULL); |
| 69 | } |
| 70 | mutex_unlock(&nf_log_mutex); |
| 71 | synchronize_rcu(); |
| 72 | } |
| 73 | EXPORT_SYMBOL(nf_log_unset); |
| 74 | |
Adam Buchbinder | d93cf06 | 2012-09-19 21:47:58 -0400 | [diff] [blame] | 75 | /* return EEXIST if the same logger is registered, 0 on success. */ |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 76 | int nf_log_register(u_int8_t pf, struct nf_logger *logger) |
| 77 | { |
Eric Dumazet | b6f0a36 | 2009-04-15 12:16:19 +0200 | [diff] [blame] | 78 | int i; |
Marcelo Leitner | 8ac2bde | 2014-10-29 10:51:13 -0200 | [diff] [blame] | 79 | int ret = 0; |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 80 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 81 | if (pf >= ARRAY_SIZE(init_net.nf.nf_loggers)) |
Harald Welte | 8a61fad | 2005-08-09 20:23:53 -0700 | [diff] [blame] | 82 | return -EINVAL; |
| 83 | |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 84 | mutex_lock(&nf_log_mutex); |
Harald Welte | d72367b | 2005-08-09 20:23:36 -0700 | [diff] [blame] | 85 | |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 86 | if (pf == NFPROTO_UNSPEC) { |
Marcelo Leitner | 8ac2bde | 2014-10-29 10:51:13 -0200 | [diff] [blame] | 87 | for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) { |
| 88 | if (rcu_access_pointer(loggers[i][logger->type])) { |
| 89 | ret = -EEXIST; |
| 90 | goto unlock; |
| 91 | } |
| 92 | } |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 93 | for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) |
Pablo Neira Ayuso | 5962815 | 2014-06-18 19:24:30 +0200 | [diff] [blame] | 94 | rcu_assign_pointer(loggers[i][logger->type], logger); |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 95 | } else { |
Marcelo Leitner | 8ac2bde | 2014-10-29 10:51:13 -0200 | [diff] [blame] | 96 | if (rcu_access_pointer(loggers[pf][logger->type])) { |
| 97 | ret = -EEXIST; |
| 98 | goto unlock; |
| 99 | } |
Pablo Neira Ayuso | 5962815 | 2014-06-18 19:24:30 +0200 | [diff] [blame] | 100 | rcu_assign_pointer(loggers[pf][logger->type], logger); |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 101 | } |
Patrick McHardy | 9b73534 | 2007-02-12 11:11:39 -0800 | [diff] [blame] | 102 | |
Marcelo Leitner | 8ac2bde | 2014-10-29 10:51:13 -0200 | [diff] [blame] | 103 | unlock: |
Patrick McHardy | 9b73534 | 2007-02-12 11:11:39 -0800 | [diff] [blame] | 104 | mutex_unlock(&nf_log_mutex); |
Marcelo Leitner | 8ac2bde | 2014-10-29 10:51:13 -0200 | [diff] [blame] | 105 | return ret; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 106 | } |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 107 | EXPORT_SYMBOL(nf_log_register); |
| 108 | |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 109 | void nf_log_unregister(struct nf_logger *logger) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 110 | { |
Florian Westphal | 205ee117 | 2015-09-09 02:57:21 +0200 | [diff] [blame] | 111 | const struct nf_logger *log; |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 112 | int i; |
| 113 | |
Patrick McHardy | 9b73534 | 2007-02-12 11:11:39 -0800 | [diff] [blame] | 114 | mutex_lock(&nf_log_mutex); |
Florian Westphal | 205ee117 | 2015-09-09 02:57:21 +0200 | [diff] [blame] | 115 | for (i = 0; i < NFPROTO_NUMPROTO; i++) { |
| 116 | log = nft_log_dereference(loggers[i][logger->type]); |
| 117 | if (log == logger) |
| 118 | RCU_INIT_POINTER(loggers[i][logger->type], NULL); |
| 119 | } |
Patrick McHardy | 9b73534 | 2007-02-12 11:11:39 -0800 | [diff] [blame] | 120 | mutex_unlock(&nf_log_mutex); |
Pablo Neira Ayuso | ad5001c | 2015-09-17 13:37:00 +0200 | [diff] [blame] | 121 | synchronize_rcu(); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 122 | } |
Patrick McHardy | e92ad99 | 2007-02-12 11:11:55 -0800 | [diff] [blame] | 123 | EXPORT_SYMBOL(nf_log_unregister); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 124 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 125 | int nf_log_bind_pf(struct net *net, u_int8_t pf, |
| 126 | const struct nf_logger *logger) |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 127 | { |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 128 | if (pf >= ARRAY_SIZE(net->nf.nf_loggers)) |
Jan Engelhardt | 9ef0298 | 2011-03-02 12:10:13 +0100 | [diff] [blame] | 129 | return -EINVAL; |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 130 | mutex_lock(&nf_log_mutex); |
| 131 | if (__find_logger(pf, logger->name) == NULL) { |
| 132 | mutex_unlock(&nf_log_mutex); |
| 133 | return -ENOENT; |
| 134 | } |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 135 | rcu_assign_pointer(net->nf.nf_loggers[pf], logger); |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 136 | mutex_unlock(&nf_log_mutex); |
| 137 | return 0; |
| 138 | } |
| 139 | EXPORT_SYMBOL(nf_log_bind_pf); |
| 140 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 141 | void nf_log_unbind_pf(struct net *net, u_int8_t pf) |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 142 | { |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 143 | if (pf >= ARRAY_SIZE(net->nf.nf_loggers)) |
Jan Engelhardt | 9ef0298 | 2011-03-02 12:10:13 +0100 | [diff] [blame] | 144 | return; |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 145 | mutex_lock(&nf_log_mutex); |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 146 | RCU_INIT_POINTER(net->nf.nf_loggers[pf], NULL); |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 147 | mutex_unlock(&nf_log_mutex); |
| 148 | } |
| 149 | EXPORT_SYMBOL(nf_log_unbind_pf); |
| 150 | |
Pablo Neira Ayuso | 960649d | 2014-06-23 00:28:18 +0200 | [diff] [blame] | 151 | void nf_logger_request_module(int pf, enum nf_log_type type) |
| 152 | { |
| 153 | if (loggers[pf][type] == NULL) |
| 154 | request_module("nf-logger-%u-%u", pf, type); |
| 155 | } |
| 156 | EXPORT_SYMBOL_GPL(nf_logger_request_module); |
| 157 | |
Pablo Neira Ayuso | fab4085 | 2014-06-18 19:38:25 +0200 | [diff] [blame] | 158 | int nf_logger_find_get(int pf, enum nf_log_type type) |
| 159 | { |
| 160 | struct nf_logger *logger; |
| 161 | int ret = -ENOENT; |
| 162 | |
Liping Zhang | f3bb533 | 2016-06-08 20:43:17 +0800 | [diff] [blame] | 163 | if (pf == NFPROTO_INET) { |
| 164 | ret = nf_logger_find_get(NFPROTO_IPV4, type); |
| 165 | if (ret < 0) |
| 166 | return ret; |
| 167 | |
| 168 | ret = nf_logger_find_get(NFPROTO_IPV6, type); |
| 169 | if (ret < 0) { |
| 170 | nf_logger_put(NFPROTO_IPV4, type); |
| 171 | return ret; |
| 172 | } |
| 173 | |
| 174 | return 0; |
| 175 | } |
| 176 | |
Pablo Neira Ayuso | c5a589c | 2014-10-30 18:39:12 +0100 | [diff] [blame] | 177 | if (rcu_access_pointer(loggers[pf][type]) == NULL) |
Pablo Neira Ayuso | fab4085 | 2014-06-18 19:38:25 +0200 | [diff] [blame] | 178 | request_module("nf-logger-%u-%u", pf, type); |
| 179 | |
| 180 | rcu_read_lock(); |
| 181 | logger = rcu_dereference(loggers[pf][type]); |
| 182 | if (logger == NULL) |
| 183 | goto out; |
| 184 | |
Shivani Bhardwaj | 7e53e7f | 2016-06-12 00:26:10 +0530 | [diff] [blame] | 185 | if (try_module_get(logger->me)) |
Pablo Neira Ayuso | fab4085 | 2014-06-18 19:38:25 +0200 | [diff] [blame] | 186 | ret = 0; |
| 187 | out: |
| 188 | rcu_read_unlock(); |
| 189 | return ret; |
| 190 | } |
| 191 | EXPORT_SYMBOL_GPL(nf_logger_find_get); |
| 192 | |
| 193 | void nf_logger_put(int pf, enum nf_log_type type) |
| 194 | { |
| 195 | struct nf_logger *logger; |
| 196 | |
Liping Zhang | f3bb533 | 2016-06-08 20:43:17 +0800 | [diff] [blame] | 197 | if (pf == NFPROTO_INET) { |
| 198 | nf_logger_put(NFPROTO_IPV4, type); |
| 199 | nf_logger_put(NFPROTO_IPV6, type); |
| 200 | return; |
| 201 | } |
| 202 | |
Pablo Neira Ayuso | fab4085 | 2014-06-18 19:38:25 +0200 | [diff] [blame] | 203 | BUG_ON(loggers[pf][type] == NULL); |
| 204 | |
| 205 | rcu_read_lock(); |
| 206 | logger = rcu_dereference(loggers[pf][type]); |
| 207 | module_put(logger->me); |
| 208 | rcu_read_unlock(); |
| 209 | } |
| 210 | EXPORT_SYMBOL_GPL(nf_logger_put); |
| 211 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 212 | void nf_log_packet(struct net *net, |
| 213 | u_int8_t pf, |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 214 | unsigned int hooknum, |
| 215 | const struct sk_buff *skb, |
| 216 | const struct net_device *in, |
| 217 | const struct net_device *out, |
Patrick McHardy | 7b2f963 | 2007-12-17 22:39:08 -0800 | [diff] [blame] | 218 | const struct nf_loginfo *loginfo, |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 219 | const char *fmt, ...) |
| 220 | { |
| 221 | va_list args; |
| 222 | char prefix[NF_LOG_PREFIXLEN]; |
Patrick McHardy | 7b2f963 | 2007-12-17 22:39:08 -0800 | [diff] [blame] | 223 | const struct nf_logger *logger; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 224 | |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 225 | rcu_read_lock(); |
Pablo Neira Ayuso | fab4085 | 2014-06-18 19:38:25 +0200 | [diff] [blame] | 226 | if (loginfo != NULL) |
| 227 | logger = rcu_dereference(loggers[pf][loginfo->type]); |
| 228 | else |
| 229 | logger = rcu_dereference(net->nf.nf_loggers[pf]); |
| 230 | |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 231 | if (logger) { |
| 232 | va_start(args, fmt); |
| 233 | vsnprintf(prefix, sizeof(prefix), fmt, args); |
| 234 | va_end(args); |
Hans Schillstrom | 8cdb46d | 2013-05-15 01:23:45 +0000 | [diff] [blame] | 235 | logger->logfn(net, pf, hooknum, skb, in, out, loginfo, prefix); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 236 | } |
| 237 | rcu_read_unlock(); |
| 238 | } |
| 239 | EXPORT_SYMBOL(nf_log_packet); |
| 240 | |
Pablo Neira Ayuso | 4017a7e | 2015-03-02 01:10:28 +0100 | [diff] [blame] | 241 | void nf_log_trace(struct net *net, |
| 242 | u_int8_t pf, |
| 243 | unsigned int hooknum, |
| 244 | const struct sk_buff *skb, |
| 245 | const struct net_device *in, |
| 246 | const struct net_device *out, |
| 247 | const struct nf_loginfo *loginfo, const char *fmt, ...) |
| 248 | { |
| 249 | va_list args; |
| 250 | char prefix[NF_LOG_PREFIXLEN]; |
| 251 | const struct nf_logger *logger; |
| 252 | |
| 253 | rcu_read_lock(); |
| 254 | logger = rcu_dereference(net->nf.nf_loggers[pf]); |
| 255 | if (logger) { |
| 256 | va_start(args, fmt); |
| 257 | vsnprintf(prefix, sizeof(prefix), fmt, args); |
| 258 | va_end(args); |
| 259 | logger->logfn(net, pf, hooknum, skb, in, out, loginfo, prefix); |
| 260 | } |
| 261 | rcu_read_unlock(); |
| 262 | } |
| 263 | EXPORT_SYMBOL(nf_log_trace); |
| 264 | |
Pablo Neira Ayuso | 27fd8d90 | 2014-06-19 12:37:58 +0200 | [diff] [blame] | 265 | #define S_SIZE (1024 - (sizeof(unsigned int) + 1)) |
| 266 | |
| 267 | struct nf_log_buf { |
| 268 | unsigned int count; |
| 269 | char buf[S_SIZE + 1]; |
| 270 | }; |
| 271 | static struct nf_log_buf emergency, *emergency_ptr = &emergency; |
| 272 | |
| 273 | __printf(2, 3) int nf_log_buf_add(struct nf_log_buf *m, const char *f, ...) |
| 274 | { |
| 275 | va_list args; |
| 276 | int len; |
| 277 | |
| 278 | if (likely(m->count < S_SIZE)) { |
| 279 | va_start(args, f); |
| 280 | len = vsnprintf(m->buf + m->count, S_SIZE - m->count, f, args); |
| 281 | va_end(args); |
| 282 | if (likely(m->count + len < S_SIZE)) { |
| 283 | m->count += len; |
| 284 | return 0; |
| 285 | } |
| 286 | } |
| 287 | m->count = S_SIZE; |
| 288 | printk_once(KERN_ERR KBUILD_MODNAME " please increase S_SIZE\n"); |
| 289 | return -1; |
| 290 | } |
| 291 | EXPORT_SYMBOL_GPL(nf_log_buf_add); |
| 292 | |
| 293 | struct nf_log_buf *nf_log_buf_open(void) |
| 294 | { |
| 295 | struct nf_log_buf *m = kmalloc(sizeof(*m), GFP_ATOMIC); |
| 296 | |
| 297 | if (unlikely(!m)) { |
| 298 | local_bh_disable(); |
| 299 | do { |
| 300 | m = xchg(&emergency_ptr, NULL); |
| 301 | } while (!m); |
| 302 | } |
| 303 | m->count = 0; |
| 304 | return m; |
| 305 | } |
| 306 | EXPORT_SYMBOL_GPL(nf_log_buf_open); |
| 307 | |
| 308 | void nf_log_buf_close(struct nf_log_buf *m) |
| 309 | { |
| 310 | m->buf[m->count] = 0; |
| 311 | printk("%s\n", m->buf); |
| 312 | |
| 313 | if (likely(m != &emergency)) |
| 314 | kfree(m); |
| 315 | else { |
| 316 | emergency_ptr = m; |
| 317 | local_bh_enable(); |
| 318 | } |
| 319 | } |
| 320 | EXPORT_SYMBOL_GPL(nf_log_buf_close); |
| 321 | |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 322 | #ifdef CONFIG_PROC_FS |
| 323 | static void *seq_start(struct seq_file *seq, loff_t *pos) |
| 324 | { |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 325 | struct net *net = seq_file_net(seq); |
| 326 | |
Patrick McHardy | 6440fe0 | 2009-11-19 04:59:05 +0000 | [diff] [blame] | 327 | mutex_lock(&nf_log_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 328 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 329 | if (*pos >= ARRAY_SIZE(net->nf.nf_loggers)) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 330 | return NULL; |
| 331 | |
| 332 | return pos; |
| 333 | } |
| 334 | |
| 335 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 336 | { |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 337 | struct net *net = seq_file_net(s); |
| 338 | |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 339 | (*pos)++; |
| 340 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 341 | if (*pos >= ARRAY_SIZE(net->nf.nf_loggers)) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 342 | return NULL; |
| 343 | |
| 344 | return pos; |
| 345 | } |
| 346 | |
| 347 | static void seq_stop(struct seq_file *s, void *v) |
| 348 | { |
Patrick McHardy | 6440fe0 | 2009-11-19 04:59:05 +0000 | [diff] [blame] | 349 | mutex_unlock(&nf_log_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 350 | } |
| 351 | |
| 352 | static int seq_show(struct seq_file *s, void *v) |
| 353 | { |
| 354 | loff_t *pos = v; |
| 355 | const struct nf_logger *logger; |
Steven Rostedt (Red Hat) | e71456a | 2014-10-27 17:43:45 -0400 | [diff] [blame] | 356 | int i; |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 357 | struct net *net = seq_file_net(s); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 358 | |
Marcelo Leitner | 0c26ed1 | 2014-10-29 10:04:51 -0200 | [diff] [blame] | 359 | logger = nft_log_dereference(net->nf.nf_loggers[*pos]); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 360 | |
| 361 | if (!logger) |
Steven Rostedt (Red Hat) | e71456a | 2014-10-27 17:43:45 -0400 | [diff] [blame] | 362 | seq_printf(s, "%2lld NONE (", *pos); |
Eric Leblond | c7a913c | 2009-03-16 14:55:27 +0100 | [diff] [blame] | 363 | else |
Steven Rostedt (Red Hat) | e71456a | 2014-10-27 17:43:45 -0400 | [diff] [blame] | 364 | seq_printf(s, "%2lld %s (", *pos, logger->name); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 365 | |
Steven Rostedt (Red Hat) | e71456a | 2014-10-27 17:43:45 -0400 | [diff] [blame] | 366 | if (seq_has_overflowed(s)) |
| 367 | return -ENOSPC; |
Eric Leblond | c7a913c | 2009-03-16 14:55:27 +0100 | [diff] [blame] | 368 | |
Pablo Neira Ayuso | 5962815 | 2014-06-18 19:24:30 +0200 | [diff] [blame] | 369 | for (i = 0; i < NF_LOG_TYPE_MAX; i++) { |
| 370 | if (loggers[*pos][i] == NULL) |
| 371 | continue; |
| 372 | |
Marcelo Leitner | 0c26ed1 | 2014-10-29 10:04:51 -0200 | [diff] [blame] | 373 | logger = nft_log_dereference(loggers[*pos][i]); |
Steven Rostedt (Red Hat) | e71456a | 2014-10-27 17:43:45 -0400 | [diff] [blame] | 374 | seq_printf(s, "%s", logger->name); |
| 375 | if (i == 0 && loggers[*pos][i + 1] != NULL) |
| 376 | seq_printf(s, ","); |
| 377 | |
| 378 | if (seq_has_overflowed(s)) |
| 379 | return -ENOSPC; |
Eric Leblond | c7a913c | 2009-03-16 14:55:27 +0100 | [diff] [blame] | 380 | } |
Eric Leblond | c7a913c | 2009-03-16 14:55:27 +0100 | [diff] [blame] | 381 | |
Steven Rostedt (Red Hat) | e71456a | 2014-10-27 17:43:45 -0400 | [diff] [blame] | 382 | seq_printf(s, ")\n"); |
| 383 | |
| 384 | if (seq_has_overflowed(s)) |
| 385 | return -ENOSPC; |
| 386 | return 0; |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 387 | } |
| 388 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 389 | static const struct seq_operations nflog_seq_ops = { |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 390 | .start = seq_start, |
| 391 | .next = seq_next, |
| 392 | .stop = seq_stop, |
| 393 | .show = seq_show, |
| 394 | }; |
| 395 | |
| 396 | static int nflog_open(struct inode *inode, struct file *file) |
| 397 | { |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 398 | return seq_open_net(inode, file, &nflog_seq_ops, |
| 399 | sizeof(struct seq_net_private)); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 400 | } |
| 401 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 402 | static const struct file_operations nflog_file_ops = { |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 403 | .owner = THIS_MODULE, |
| 404 | .open = nflog_open, |
| 405 | .read = seq_read, |
| 406 | .llseek = seq_lseek, |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 407 | .release = seq_release_net, |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 408 | }; |
| 409 | |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 410 | |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 411 | #endif /* PROC_FS */ |
| 412 | |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 413 | #ifdef CONFIG_SYSCTL |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 414 | static char nf_log_sysctl_fnames[NFPROTO_NUMPROTO-NFPROTO_UNSPEC][3]; |
| 415 | static struct ctl_table nf_log_sysctl_table[NFPROTO_NUMPROTO+1]; |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 416 | |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame] | 417 | static int nf_log_proc_dostring(struct ctl_table *table, int write, |
Patrick McHardy | 2495561 | 2009-06-22 14:15:30 +0200 | [diff] [blame] | 418 | void __user *buffer, size_t *lenp, loff_t *ppos) |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 419 | { |
| 420 | const struct nf_logger *logger; |
Patrick McHardy | 2495561 | 2009-06-22 14:15:30 +0200 | [diff] [blame] | 421 | char buf[NFLOGGER_NAME_LEN]; |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 422 | int r = 0; |
| 423 | int tindex = (unsigned long)table->extra1; |
Jann Horn | dbb5918 | 2016-09-18 21:40:55 +0200 | [diff] [blame] | 424 | struct net *net = table->extra2; |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 425 | |
| 426 | if (write) { |
Pavel Tikhomirov | c6ac37d | 2016-07-01 16:53:54 +0300 | [diff] [blame] | 427 | struct ctl_table tmp = *table; |
| 428 | |
Jann Horn | f6a6768 | 2018-06-20 18:33:45 +0200 | [diff] [blame^] | 429 | /* proc_dostring() can append to existing strings, so we need to |
| 430 | * initialize it as an empty string. |
| 431 | */ |
| 432 | buf[0] = '\0'; |
Pavel Tikhomirov | c6ac37d | 2016-07-01 16:53:54 +0300 | [diff] [blame] | 433 | tmp.data = buf; |
| 434 | r = proc_dostring(&tmp, write, buffer, lenp, ppos); |
| 435 | if (r) |
| 436 | return r; |
Patrick McHardy | 2495561 | 2009-06-22 14:15:30 +0200 | [diff] [blame] | 437 | |
| 438 | if (!strcmp(buf, "NONE")) { |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 439 | nf_log_unbind_pf(net, tindex); |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 440 | return 0; |
| 441 | } |
| 442 | mutex_lock(&nf_log_mutex); |
Patrick McHardy | 2495561 | 2009-06-22 14:15:30 +0200 | [diff] [blame] | 443 | logger = __find_logger(tindex, buf); |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 444 | if (logger == NULL) { |
| 445 | mutex_unlock(&nf_log_mutex); |
| 446 | return -ENOENT; |
| 447 | } |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 448 | rcu_assign_pointer(net->nf.nf_loggers[tindex], logger); |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 449 | mutex_unlock(&nf_log_mutex); |
| 450 | } else { |
Jann Horn | 1712fae | 2018-06-25 17:22:00 +0200 | [diff] [blame] | 451 | struct ctl_table tmp = *table; |
| 452 | |
| 453 | tmp.data = buf; |
Patrick McHardy | 266d07c | 2009-06-13 12:21:10 +0200 | [diff] [blame] | 454 | mutex_lock(&nf_log_mutex); |
Marcelo Leitner | 0c26ed1 | 2014-10-29 10:04:51 -0200 | [diff] [blame] | 455 | logger = nft_log_dereference(net->nf.nf_loggers[tindex]); |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 456 | if (!logger) |
Jann Horn | 1712fae | 2018-06-25 17:22:00 +0200 | [diff] [blame] | 457 | strlcpy(buf, "NONE", sizeof(buf)); |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 458 | else |
Jann Horn | 1712fae | 2018-06-25 17:22:00 +0200 | [diff] [blame] | 459 | strlcpy(buf, logger->name, sizeof(buf)); |
Patrick McHardy | 266d07c | 2009-06-13 12:21:10 +0200 | [diff] [blame] | 460 | mutex_unlock(&nf_log_mutex); |
Jann Horn | 1712fae | 2018-06-25 17:22:00 +0200 | [diff] [blame] | 461 | r = proc_dostring(&tmp, write, buffer, lenp, ppos); |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 462 | } |
| 463 | |
| 464 | return r; |
| 465 | } |
| 466 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 467 | static int netfilter_log_sysctl_init(struct net *net) |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 468 | { |
| 469 | int i; |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 470 | struct ctl_table *table; |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 471 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 472 | table = nf_log_sysctl_table; |
| 473 | if (!net_eq(net, &init_net)) { |
| 474 | table = kmemdup(nf_log_sysctl_table, |
| 475 | sizeof(nf_log_sysctl_table), |
| 476 | GFP_KERNEL); |
| 477 | if (!table) |
| 478 | goto err_alloc; |
| 479 | } else { |
| 480 | for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) { |
| 481 | snprintf(nf_log_sysctl_fnames[i], |
| 482 | 3, "%d", i); |
| 483 | nf_log_sysctl_table[i].procname = |
| 484 | nf_log_sysctl_fnames[i]; |
Fabian Frederick | 8aefc4d | 2014-12-22 19:36:15 +0100 | [diff] [blame] | 485 | nf_log_sysctl_table[i].maxlen = NFLOGGER_NAME_LEN; |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 486 | nf_log_sysctl_table[i].mode = 0644; |
| 487 | nf_log_sysctl_table[i].proc_handler = |
| 488 | nf_log_proc_dostring; |
| 489 | nf_log_sysctl_table[i].extra1 = |
| 490 | (void *)(unsigned long) i; |
| 491 | } |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 492 | } |
| 493 | |
Jann Horn | dbb5918 | 2016-09-18 21:40:55 +0200 | [diff] [blame] | 494 | for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) |
| 495 | table[i].extra2 = net; |
| 496 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 497 | net->nf.nf_log_dir_header = register_net_sysctl(net, |
| 498 | "net/netfilter/nf_log", |
| 499 | table); |
| 500 | if (!net->nf.nf_log_dir_header) |
| 501 | goto err_reg; |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 502 | |
| 503 | return 0; |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 504 | |
| 505 | err_reg: |
| 506 | if (!net_eq(net, &init_net)) |
| 507 | kfree(table); |
| 508 | err_alloc: |
| 509 | return -ENOMEM; |
| 510 | } |
| 511 | |
| 512 | static void netfilter_log_sysctl_exit(struct net *net) |
| 513 | { |
| 514 | struct ctl_table *table; |
| 515 | |
| 516 | table = net->nf.nf_log_dir_header->ctl_table_arg; |
| 517 | unregister_net_sysctl_table(net->nf.nf_log_dir_header); |
| 518 | if (!net_eq(net, &init_net)) |
| 519 | kfree(table); |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 520 | } |
| 521 | #else |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 522 | static int netfilter_log_sysctl_init(struct net *net) |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 523 | { |
| 524 | return 0; |
| 525 | } |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 526 | |
| 527 | static void netfilter_log_sysctl_exit(struct net *net) |
| 528 | { |
| 529 | } |
Eric Leblond | 1762527 | 2009-03-23 13:16:53 +0100 | [diff] [blame] | 530 | #endif /* CONFIG_SYSCTL */ |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 531 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 532 | static int __net_init nf_log_net_init(struct net *net) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 533 | { |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 534 | int ret = -ENOMEM; |
| 535 | |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 536 | #ifdef CONFIG_PROC_FS |
Denis V. Lunev | 8eeee8b | 2008-03-27 16:55:53 -0700 | [diff] [blame] | 537 | if (!proc_create("nf_log", S_IRUGO, |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 538 | net->nf.proc_netfilter, &nflog_file_ops)) |
| 539 | return ret; |
Harald Welte | 6224392 | 2005-08-11 15:30:45 -0700 | [diff] [blame] | 540 | #endif |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 541 | ret = netfilter_log_sysctl_init(net); |
| 542 | if (ret < 0) |
| 543 | goto out_sysctl; |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 544 | |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 545 | return 0; |
| 546 | |
| 547 | out_sysctl: |
Pablo Neira Ayuso | e778f56 | 2013-04-30 08:01:18 +0000 | [diff] [blame] | 548 | #ifdef CONFIG_PROC_FS |
Pablo Neira Ayuso | 6d11cfd | 2013-05-22 22:42:36 +0000 | [diff] [blame] | 549 | remove_proc_entry("nf_log", net->nf.proc_netfilter); |
Pablo Neira Ayuso | e778f56 | 2013-04-30 08:01:18 +0000 | [diff] [blame] | 550 | #endif |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 551 | return ret; |
| 552 | } |
| 553 | |
| 554 | static void __net_exit nf_log_net_exit(struct net *net) |
| 555 | { |
| 556 | netfilter_log_sysctl_exit(net); |
Pablo Neira Ayuso | e778f56 | 2013-04-30 08:01:18 +0000 | [diff] [blame] | 557 | #ifdef CONFIG_PROC_FS |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 558 | remove_proc_entry("nf_log", net->nf.proc_netfilter); |
Pablo Neira Ayuso | e778f56 | 2013-04-30 08:01:18 +0000 | [diff] [blame] | 559 | #endif |
Gao feng | 30e0c6a | 2013-03-24 23:50:40 +0000 | [diff] [blame] | 560 | } |
| 561 | |
| 562 | static struct pernet_operations nf_log_net_ops = { |
| 563 | .init = nf_log_net_init, |
| 564 | .exit = nf_log_net_exit, |
| 565 | }; |
| 566 | |
| 567 | int __init netfilter_log_init(void) |
| 568 | { |
Pablo Neira Ayuso | 5962815 | 2014-06-18 19:24:30 +0200 | [diff] [blame] | 569 | return register_pernet_subsys(&nf_log_net_ops); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 570 | } |