Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * netfilter module for userspace bridged Ethernet frames logging daemons |
| 3 | * |
| 4 | * Authors: |
| 5 | * Bart De Schuymer <bdschuym@pandora.be> |
Bart De Schuymer | d5228a4 | 2005-12-13 23:14:08 -0800 | [diff] [blame] | 6 | * Harald Welte <laforge@netfilter.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
| 8 | * November, 2004 |
| 9 | * |
| 10 | * Based on ipt_ULOG.c, which is |
| 11 | * (C) 2000-2002 by Harald Welte <laforge@netfilter.org> |
| 12 | * |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 13 | * This module accepts two parameters: |
| 14 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | * nlbufsiz: |
| 16 | * The parameter specifies how big the buffer for each netlink multicast |
| 17 | * group is. e.g. If you say nlbufsiz=8192, up to eight kb of packets will |
| 18 | * get accumulated in the kernel until they are sent to userspace. It is |
| 19 | * NOT possible to allocate more than 128kB, and it is strongly discouraged, |
| 20 | * because atomically allocating 128kB inside the network rx softirq is not |
| 21 | * reliable. Please also keep in mind that this buffer size is allocated for |
| 22 | * each nlgroup you are using, so the total kernel memory usage increases |
| 23 | * by that factor. |
| 24 | * |
| 25 | * flushtimeout: |
| 26 | * Specify, after how many hundredths of a second the queue should be |
| 27 | * flushed even if it is not full yet. |
| 28 | * |
| 29 | */ |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 30 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 32 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/spinlock.h> |
| 34 | #include <linux/socket.h> |
| 35 | #include <linux/skbuff.h> |
| 36 | #include <linux/kernel.h> |
| 37 | #include <linux/timer.h> |
| 38 | #include <linux/netlink.h> |
| 39 | #include <linux/netdevice.h> |
Jan Engelhardt | 18219d3 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 40 | #include <linux/netfilter/x_tables.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include <linux/netfilter_bridge/ebtables.h> |
| 42 | #include <linux/netfilter_bridge/ebt_ulog.h> |
Patrick McHardy | f01ffbd | 2007-12-17 22:38:49 -0800 | [diff] [blame] | 43 | #include <net/netfilter/nf_log.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <net/sock.h> |
| 45 | #include "../br_private.h" |
| 46 | |
Holger Eitzenberger | c2db292 | 2006-02-04 02:13:14 -0800 | [diff] [blame] | 47 | static unsigned int nlbufsiz = NLMSG_GOODSIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | module_param(nlbufsiz, uint, 0600); |
| 49 | MODULE_PARM_DESC(nlbufsiz, "netlink buffer size (number of bytes) " |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 50 | "(defaults to 4096)"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
| 52 | static unsigned int flushtimeout = 10; |
| 53 | module_param(flushtimeout, uint, 0600); |
| 54 | MODULE_PARM_DESC(flushtimeout, "buffer flush timeout (hundredths ofa second) " |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 55 | "(defaults to 10)"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
| 57 | typedef struct { |
| 58 | unsigned int qlen; /* number of nlmsgs' in the skb */ |
| 59 | struct nlmsghdr *lastnlh; /* netlink header of last msg in skb */ |
| 60 | struct sk_buff *skb; /* the pre-allocated skb */ |
| 61 | struct timer_list timer; /* the timer function */ |
| 62 | spinlock_t lock; /* the per-queue lock */ |
| 63 | } ebt_ulog_buff_t; |
| 64 | |
| 65 | static ebt_ulog_buff_t ulog_buffers[EBT_ULOG_MAXNLGROUPS]; |
| 66 | static struct sock *ebtulognl; |
| 67 | |
| 68 | /* send one ulog_buff_t to userspace */ |
| 69 | static void ulog_send(unsigned int nlgroup) |
| 70 | { |
| 71 | ebt_ulog_buff_t *ub = &ulog_buffers[nlgroup]; |
| 72 | |
Ying Xue | 25cc4ae | 2013-02-03 20:32:57 +0000 | [diff] [blame] | 73 | del_timer(&ub->timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
Mark Huang | dcb7cd9 | 2006-08-13 18:57:54 -0700 | [diff] [blame] | 75 | if (!ub->skb) |
| 76 | return; |
| 77 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | /* last nlmsg needs NLMSG_DONE */ |
| 79 | if (ub->qlen > 1) |
| 80 | ub->lastnlh->nlmsg_type = NLMSG_DONE; |
| 81 | |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 82 | NETLINK_CB(ub->skb).dst_group = nlgroup + 1; |
| 83 | netlink_broadcast(ebtulognl, ub->skb, 0, nlgroup + 1, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
| 85 | ub->qlen = 0; |
| 86 | ub->skb = NULL; |
| 87 | } |
| 88 | |
| 89 | /* timer function to flush queue in flushtimeout time */ |
| 90 | static void ulog_timer(unsigned long data) |
| 91 | { |
| 92 | spin_lock_bh(&ulog_buffers[data].lock); |
| 93 | if (ulog_buffers[data].skb) |
| 94 | ulog_send(data); |
| 95 | spin_unlock_bh(&ulog_buffers[data].lock); |
| 96 | } |
| 97 | |
| 98 | static struct sk_buff *ulog_alloc_skb(unsigned int size) |
| 99 | { |
| 100 | struct sk_buff *skb; |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 101 | unsigned int n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 103 | n = max(size, nlbufsiz); |
Joe Perches | 0a9ee81 | 2011-08-29 14:17:25 -0700 | [diff] [blame] | 104 | skb = alloc_skb(n, GFP_ATOMIC | __GFP_NOWARN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | if (!skb) { |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 106 | if (n > size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | /* try to allocate only as much as we need for |
| 108 | * current packet */ |
| 109 | skb = alloc_skb(size, GFP_ATOMIC); |
| 110 | if (!skb) |
Joe Perches | 0a9ee81 | 2011-08-29 14:17:25 -0700 | [diff] [blame] | 111 | pr_debug("cannot even allocate buffer of size %ub\n", |
| 112 | size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | } |
| 114 | } |
| 115 | |
| 116 | return skb; |
| 117 | } |
| 118 | |
Bart De Schuymer | d5228a4 | 2005-12-13 23:14:08 -0800 | [diff] [blame] | 119 | static void ebt_ulog_packet(unsigned int hooknr, const struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | const struct net_device *in, const struct net_device *out, |
Bart De Schuymer | d5228a4 | 2005-12-13 23:14:08 -0800 | [diff] [blame] | 121 | const struct ebt_ulog_info *uloginfo, const char *prefix) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | { |
| 123 | ebt_ulog_packet_msg_t *pm; |
| 124 | size_t size, copy_len; |
| 125 | struct nlmsghdr *nlh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | unsigned int group = uloginfo->nlgroup; |
| 127 | ebt_ulog_buff_t *ub = &ulog_buffers[group]; |
| 128 | spinlock_t *lock = &ub->lock; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 129 | ktime_t kt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
| 131 | if ((uloginfo->cprange == 0) || |
| 132 | (uloginfo->cprange > skb->len + ETH_HLEN)) |
| 133 | copy_len = skb->len + ETH_HLEN; |
| 134 | else |
| 135 | copy_len = uloginfo->cprange; |
| 136 | |
| 137 | size = NLMSG_SPACE(sizeof(*pm) + copy_len); |
| 138 | if (size > nlbufsiz) { |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 139 | pr_debug("Size %Zd needed, but nlbufsiz=%d\n", size, nlbufsiz); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | return; |
| 141 | } |
| 142 | |
| 143 | spin_lock_bh(lock); |
| 144 | |
| 145 | if (!ub->skb) { |
| 146 | if (!(ub->skb = ulog_alloc_skb(size))) |
David S. Miller | 62566ca | 2012-06-26 21:23:42 -0700 | [diff] [blame] | 147 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | } else if (size > skb_tailroom(ub->skb)) { |
| 149 | ulog_send(group); |
| 150 | |
| 151 | if (!(ub->skb = ulog_alloc_skb(size))) |
David S. Miller | 62566ca | 2012-06-26 21:23:42 -0700 | [diff] [blame] | 152 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | } |
| 154 | |
David S. Miller | 62566ca | 2012-06-26 21:23:42 -0700 | [diff] [blame] | 155 | nlh = nlmsg_put(ub->skb, 0, ub->qlen, 0, |
| 156 | size - NLMSG_ALIGN(sizeof(*nlh)), 0); |
| 157 | if (!nlh) { |
Dan Carpenter | f7eadaf | 2012-06-30 01:48:53 +0000 | [diff] [blame] | 158 | kfree_skb(ub->skb); |
David S. Miller | 62566ca | 2012-06-26 21:23:42 -0700 | [diff] [blame] | 159 | ub->skb = NULL; |
| 160 | goto unlock; |
| 161 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | ub->qlen++; |
| 163 | |
David S. Miller | 62566ca | 2012-06-26 21:23:42 -0700 | [diff] [blame] | 164 | pm = nlmsg_data(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | |
| 166 | /* Fill in the ulog data */ |
| 167 | pm->version = EBT_ULOG_VERSION; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 168 | kt = ktime_get_real(); |
| 169 | pm->stamp = ktime_to_timeval(kt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | if (ub->qlen == 1) |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 171 | ub->skb->tstamp = kt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | pm->data_len = copy_len; |
Thomas Graf | 82e91ff | 2006-11-09 15:19:14 -0800 | [diff] [blame] | 173 | pm->mark = skb->mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | pm->hook = hooknr; |
| 175 | if (uloginfo->prefix != NULL) |
| 176 | strcpy(pm->prefix, uloginfo->prefix); |
| 177 | else |
| 178 | *(pm->prefix) = '\0'; |
| 179 | |
| 180 | if (in) { |
| 181 | strcpy(pm->physindev, in->name); |
| 182 | /* If in isn't a bridge, then physindev==indev */ |
Jiri Pirko | f350a0a8 | 2010-06-15 06:50:45 +0000 | [diff] [blame] | 183 | if (br_port_exists(in)) |
| 184 | /* rcu_read_lock()ed by nf_hook_slow */ |
| 185 | strcpy(pm->indev, br_port_get_rcu(in)->br->dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | else |
| 187 | strcpy(pm->indev, in->name); |
| 188 | } else |
| 189 | pm->indev[0] = pm->physindev[0] = '\0'; |
| 190 | |
| 191 | if (out) { |
| 192 | /* If out exists, then out is a bridge port */ |
| 193 | strcpy(pm->physoutdev, out->name); |
Jiri Pirko | f350a0a8 | 2010-06-15 06:50:45 +0000 | [diff] [blame] | 194 | /* rcu_read_lock()ed by nf_hook_slow */ |
| 195 | strcpy(pm->outdev, br_port_get_rcu(out)->br->dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | } else |
| 197 | pm->outdev[0] = pm->physoutdev[0] = '\0'; |
| 198 | |
| 199 | if (skb_copy_bits(skb, -ETH_HLEN, pm->data, copy_len) < 0) |
| 200 | BUG(); |
| 201 | |
| 202 | if (ub->qlen > 1) |
| 203 | ub->lastnlh->nlmsg_flags |= NLM_F_MULTI; |
| 204 | |
| 205 | ub->lastnlh = nlh; |
| 206 | |
| 207 | if (ub->qlen >= uloginfo->qthreshold) |
| 208 | ulog_send(group); |
| 209 | else if (!timer_pending(&ub->timer)) { |
| 210 | ub->timer.expires = jiffies + flushtimeout * HZ / 100; |
| 211 | add_timer(&ub->timer); |
| 212 | } |
| 213 | |
| 214 | unlock: |
| 215 | spin_unlock_bh(lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | } |
| 217 | |
Bart De Schuymer | d5228a4 | 2005-12-13 23:14:08 -0800 | [diff] [blame] | 218 | /* this function is registered with the netfilter core */ |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 219 | static void ebt_log_packet(u_int8_t pf, unsigned int hooknum, |
Bart De Schuymer | d5228a4 | 2005-12-13 23:14:08 -0800 | [diff] [blame] | 220 | const struct sk_buff *skb, const struct net_device *in, |
| 221 | const struct net_device *out, const struct nf_loginfo *li, |
| 222 | const char *prefix) |
| 223 | { |
| 224 | struct ebt_ulog_info loginfo; |
| 225 | |
| 226 | if (!li || li->type != NF_LOG_TYPE_ULOG) { |
| 227 | loginfo.nlgroup = EBT_ULOG_DEFAULT_NLGROUP; |
| 228 | loginfo.cprange = 0; |
| 229 | loginfo.qthreshold = EBT_ULOG_DEFAULT_QTHRESHOLD; |
| 230 | loginfo.prefix[0] = '\0'; |
| 231 | } else { |
| 232 | loginfo.nlgroup = li->u.ulog.group; |
| 233 | loginfo.cprange = li->u.ulog.copy_len; |
| 234 | loginfo.qthreshold = li->u.ulog.qthreshold; |
| 235 | strlcpy(loginfo.prefix, prefix, sizeof(loginfo.prefix)); |
| 236 | } |
| 237 | |
| 238 | ebt_ulog_packet(hooknum, skb, in, out, &loginfo, prefix); |
| 239 | } |
| 240 | |
Jan Engelhardt | 2d06d4a | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 241 | static unsigned int |
Jan Engelhardt | 4b560b4 | 2009-07-05 19:43:26 +0200 | [diff] [blame] | 242 | ebt_ulog_tg(struct sk_buff *skb, const struct xt_action_param *par) |
Bart De Schuymer | d5228a4 | 2005-12-13 23:14:08 -0800 | [diff] [blame] | 243 | { |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 244 | ebt_ulog_packet(par->hooknum, skb, par->in, par->out, |
| 245 | par->targinfo, NULL); |
Jan Engelhardt | 0ac6ab1 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 246 | return EBT_CONTINUE; |
Bart De Schuymer | d5228a4 | 2005-12-13 23:14:08 -0800 | [diff] [blame] | 247 | } |
| 248 | |
Jan Engelhardt | 135367b | 2010-03-19 17:16:42 +0100 | [diff] [blame] | 249 | static int ebt_ulog_tg_check(const struct xt_tgchk_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | { |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 251 | struct ebt_ulog_info *uloginfo = par->targinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | |
Jan Engelhardt | 18219d3 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 253 | if (uloginfo->nlgroup > 31) |
Jan Engelhardt | d6b00a5 | 2010-03-25 16:34:45 +0100 | [diff] [blame] | 254 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | |
| 256 | uloginfo->prefix[EBT_ULOG_PREFIX_LEN - 1] = '\0'; |
| 257 | |
| 258 | if (uloginfo->qthreshold > EBT_ULOG_MAX_QLEN) |
| 259 | uloginfo->qthreshold = EBT_ULOG_MAX_QLEN; |
| 260 | |
Jan Engelhardt | d6b00a5 | 2010-03-25 16:34:45 +0100 | [diff] [blame] | 261 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | } |
| 263 | |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 264 | static struct xt_target ebt_ulog_tg_reg __read_mostly = { |
| 265 | .name = "ulog", |
Jan Engelhardt | 001a18d | 2008-10-08 11:35:14 +0200 | [diff] [blame] | 266 | .revision = 0, |
| 267 | .family = NFPROTO_BRIDGE, |
Jan Engelhardt | 2d06d4a | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 268 | .target = ebt_ulog_tg, |
| 269 | .checkentry = ebt_ulog_tg_check, |
Florian Westphal | fc0e3df | 2010-02-15 18:16:26 +0100 | [diff] [blame] | 270 | .targetsize = sizeof(struct ebt_ulog_info), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | .me = THIS_MODULE, |
| 272 | }; |
| 273 | |
Eric Leblond | 704b3ea | 2009-03-26 01:03:23 -0700 | [diff] [blame] | 274 | static struct nf_logger ebt_ulog_logger __read_mostly = { |
Eric Leblond | 7249dee | 2009-03-26 01:04:28 -0700 | [diff] [blame] | 275 | .name = "ebt_ulog", |
Bart De Schuymer | d5228a4 | 2005-12-13 23:14:08 -0800 | [diff] [blame] | 276 | .logfn = &ebt_log_packet, |
| 277 | .me = THIS_MODULE, |
| 278 | }; |
| 279 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 280 | static int __init ebt_ulog_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | { |
Eric Leblond | 3b334d4 | 2009-03-26 01:04:02 -0700 | [diff] [blame] | 282 | int ret; |
Jan Engelhardt | 19eda87 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 283 | int i; |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 284 | struct netlink_kernel_cfg cfg = { |
| 285 | .groups = EBT_ULOG_MAXNLGROUPS, |
| 286 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | |
| 288 | if (nlbufsiz >= 128*1024) { |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 289 | pr_warning("Netlink buffer has to be <= 128kB," |
| 290 | " please try a smaller nlbufsiz parameter.\n"); |
Eric Leblond | 3b334d4 | 2009-03-26 01:04:02 -0700 | [diff] [blame] | 291 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | } |
| 293 | |
| 294 | /* initialize ulog_buffers */ |
| 295 | for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) { |
Patrick McHardy | e6f689d | 2007-03-23 11:16:30 -0700 | [diff] [blame] | 296 | setup_timer(&ulog_buffers[i].timer, ulog_timer, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | spin_lock_init(&ulog_buffers[i].lock); |
| 298 | } |
| 299 | |
Pablo Neira Ayuso | 9f00d97 | 2012-09-08 02:53:54 +0000 | [diff] [blame] | 300 | ebtulognl = netlink_kernel_create(&init_net, NETLINK_NFLOG, &cfg); |
Jan Engelhardt | 85bc3f3 | 2010-03-18 00:27:03 +0100 | [diff] [blame] | 301 | if (!ebtulognl) |
Eric Leblond | 3b334d4 | 2009-03-26 01:04:02 -0700 | [diff] [blame] | 302 | ret = -ENOMEM; |
Jan Engelhardt | 85bc3f3 | 2010-03-18 00:27:03 +0100 | [diff] [blame] | 303 | else if ((ret = xt_register_target(&ebt_ulog_tg_reg)) != 0) |
Denis V. Lunev | b7c6ba6 | 2008-01-28 14:41:19 -0800 | [diff] [blame] | 304 | netlink_kernel_release(ebtulognl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | |
Eric Leblond | 3b334d4 | 2009-03-26 01:04:02 -0700 | [diff] [blame] | 306 | if (ret == 0) |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 307 | nf_log_register(NFPROTO_BRIDGE, &ebt_ulog_logger); |
Bart De Schuymer | d5228a4 | 2005-12-13 23:14:08 -0800 | [diff] [blame] | 308 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | return ret; |
| 310 | } |
| 311 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 312 | static void __exit ebt_ulog_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | { |
| 314 | ebt_ulog_buff_t *ub; |
| 315 | int i; |
| 316 | |
Patrick McHardy | e92ad99 | 2007-02-12 11:11:55 -0800 | [diff] [blame] | 317 | nf_log_unregister(&ebt_ulog_logger); |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 318 | xt_unregister_target(&ebt_ulog_tg_reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) { |
| 320 | ub = &ulog_buffers[i]; |
Ying Xue | 25cc4ae | 2013-02-03 20:32:57 +0000 | [diff] [blame] | 321 | del_timer(&ub->timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | spin_lock_bh(&ub->lock); |
| 323 | if (ub->skb) { |
| 324 | kfree_skb(ub->skb); |
| 325 | ub->skb = NULL; |
| 326 | } |
| 327 | spin_unlock_bh(&ub->lock); |
| 328 | } |
Denis V. Lunev | b7c6ba6 | 2008-01-28 14:41:19 -0800 | [diff] [blame] | 329 | netlink_kernel_release(ebtulognl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | } |
| 331 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 332 | module_init(ebt_ulog_init); |
| 333 | module_exit(ebt_ulog_fini); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | MODULE_LICENSE("GPL"); |
| 335 | MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>"); |
Jan Engelhardt | f776c4c | 2008-01-31 04:00:30 -0800 | [diff] [blame] | 336 | MODULE_DESCRIPTION("Ebtables: Packet logging to netlink using ULOG"); |