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> |
Hong zhi guo | 573ce26 | 2013-03-27 06:47:04 +0000 | [diff] [blame] | 38 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Gao feng | 5b175b7 | 2013-03-24 23:50:43 +0000 | [diff] [blame] | 44 | #include <net/netns/generic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <net/sock.h> |
| 46 | #include "../br_private.h" |
| 47 | |
Holger Eitzenberger | c2db292 | 2006-02-04 02:13:14 -0800 | [diff] [blame] | 48 | static unsigned int nlbufsiz = NLMSG_GOODSIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | module_param(nlbufsiz, uint, 0600); |
| 50 | MODULE_PARM_DESC(nlbufsiz, "netlink buffer size (number of bytes) " |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 51 | "(defaults to 4096)"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
| 53 | static unsigned int flushtimeout = 10; |
| 54 | module_param(flushtimeout, uint, 0600); |
| 55 | MODULE_PARM_DESC(flushtimeout, "buffer flush timeout (hundredths ofa second) " |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 56 | "(defaults to 10)"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
| 58 | typedef struct { |
| 59 | unsigned int qlen; /* number of nlmsgs' in the skb */ |
| 60 | struct nlmsghdr *lastnlh; /* netlink header of last msg in skb */ |
| 61 | struct sk_buff *skb; /* the pre-allocated skb */ |
| 62 | struct timer_list timer; /* the timer function */ |
| 63 | spinlock_t lock; /* the per-queue lock */ |
| 64 | } ebt_ulog_buff_t; |
| 65 | |
Gao feng | 5b175b7 | 2013-03-24 23:50:43 +0000 | [diff] [blame] | 66 | static int ebt_ulog_net_id __read_mostly; |
| 67 | struct ebt_ulog_net { |
| 68 | unsigned int nlgroup[EBT_ULOG_MAXNLGROUPS]; |
| 69 | ebt_ulog_buff_t ulog_buffers[EBT_ULOG_MAXNLGROUPS]; |
| 70 | struct sock *ebtulognl; |
| 71 | }; |
| 72 | |
| 73 | static struct ebt_ulog_net *ebt_ulog_pernet(struct net *net) |
| 74 | { |
| 75 | return net_generic(net, ebt_ulog_net_id); |
| 76 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
| 78 | /* send one ulog_buff_t to userspace */ |
Gao feng | 5b175b7 | 2013-03-24 23:50:43 +0000 | [diff] [blame] | 79 | static void ulog_send(struct ebt_ulog_net *ebt, unsigned int nlgroup) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | { |
Gao feng | 5b175b7 | 2013-03-24 23:50:43 +0000 | [diff] [blame] | 81 | ebt_ulog_buff_t *ub = &ebt->ulog_buffers[nlgroup]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | |
Ying Xue | 25cc4ae | 2013-02-03 20:32:57 +0000 | [diff] [blame] | 83 | del_timer(&ub->timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
Mark Huang | dcb7cd9 | 2006-08-13 18:57:54 -0700 | [diff] [blame] | 85 | if (!ub->skb) |
| 86 | return; |
| 87 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | /* last nlmsg needs NLMSG_DONE */ |
| 89 | if (ub->qlen > 1) |
| 90 | ub->lastnlh->nlmsg_type = NLMSG_DONE; |
| 91 | |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 92 | NETLINK_CB(ub->skb).dst_group = nlgroup + 1; |
Gao feng | 5b175b7 | 2013-03-24 23:50:43 +0000 | [diff] [blame] | 93 | netlink_broadcast(ebt->ebtulognl, ub->skb, 0, nlgroup + 1, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
| 95 | ub->qlen = 0; |
| 96 | ub->skb = NULL; |
| 97 | } |
| 98 | |
| 99 | /* timer function to flush queue in flushtimeout time */ |
| 100 | static void ulog_timer(unsigned long data) |
| 101 | { |
Gao feng | 5b175b7 | 2013-03-24 23:50:43 +0000 | [diff] [blame] | 102 | struct ebt_ulog_net *ebt = container_of((void *)data, |
| 103 | struct ebt_ulog_net, |
| 104 | nlgroup[*(unsigned int *)data]); |
| 105 | |
| 106 | ebt_ulog_buff_t *ub = &ebt->ulog_buffers[*(unsigned int *)data]; |
| 107 | spin_lock_bh(&ub->lock); |
| 108 | if (ub->skb) |
| 109 | ulog_send(ebt, *(unsigned int *)data); |
| 110 | spin_unlock_bh(&ub->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | } |
| 112 | |
| 113 | static struct sk_buff *ulog_alloc_skb(unsigned int size) |
| 114 | { |
| 115 | struct sk_buff *skb; |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 116 | unsigned int n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 118 | n = max(size, nlbufsiz); |
Joe Perches | 0a9ee81 | 2011-08-29 14:17:25 -0700 | [diff] [blame] | 119 | skb = alloc_skb(n, GFP_ATOMIC | __GFP_NOWARN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | if (!skb) { |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 121 | if (n > size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | /* try to allocate only as much as we need for |
| 123 | * current packet */ |
| 124 | skb = alloc_skb(size, GFP_ATOMIC); |
| 125 | if (!skb) |
Joe Perches | 0a9ee81 | 2011-08-29 14:17:25 -0700 | [diff] [blame] | 126 | pr_debug("cannot even allocate buffer of size %ub\n", |
| 127 | size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | } |
| 129 | } |
| 130 | |
| 131 | return skb; |
| 132 | } |
| 133 | |
Hans Schillstrom | 8cdb46d | 2013-05-15 01:23:45 +0000 | [diff] [blame] | 134 | static void ebt_ulog_packet(struct net *net, unsigned int hooknr, |
| 135 | const struct sk_buff *skb, |
| 136 | const struct net_device *in, |
| 137 | const struct net_device *out, |
| 138 | const struct ebt_ulog_info *uloginfo, |
| 139 | const char *prefix) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | { |
| 141 | ebt_ulog_packet_msg_t *pm; |
| 142 | size_t size, copy_len; |
| 143 | struct nlmsghdr *nlh; |
Gao feng | 5b175b7 | 2013-03-24 23:50:43 +0000 | [diff] [blame] | 144 | struct ebt_ulog_net *ebt = ebt_ulog_pernet(net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | unsigned int group = uloginfo->nlgroup; |
Gao feng | 5b175b7 | 2013-03-24 23:50:43 +0000 | [diff] [blame] | 146 | ebt_ulog_buff_t *ub = &ebt->ulog_buffers[group]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | spinlock_t *lock = &ub->lock; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 148 | ktime_t kt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
| 150 | if ((uloginfo->cprange == 0) || |
| 151 | (uloginfo->cprange > skb->len + ETH_HLEN)) |
| 152 | copy_len = skb->len + ETH_HLEN; |
| 153 | else |
| 154 | copy_len = uloginfo->cprange; |
| 155 | |
Hong zhi guo | 573ce26 | 2013-03-27 06:47:04 +0000 | [diff] [blame] | 156 | size = nlmsg_total_size(sizeof(*pm) + copy_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | if (size > nlbufsiz) { |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 158 | pr_debug("Size %Zd needed, but nlbufsiz=%d\n", size, nlbufsiz); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | return; |
| 160 | } |
| 161 | |
| 162 | spin_lock_bh(lock); |
| 163 | |
| 164 | if (!ub->skb) { |
| 165 | if (!(ub->skb = ulog_alloc_skb(size))) |
David S. Miller | 62566ca | 2012-06-26 21:23:42 -0700 | [diff] [blame] | 166 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | } else if (size > skb_tailroom(ub->skb)) { |
Gao feng | 5b175b7 | 2013-03-24 23:50:43 +0000 | [diff] [blame] | 168 | ulog_send(ebt, group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | |
| 170 | if (!(ub->skb = ulog_alloc_skb(size))) |
David S. Miller | 62566ca | 2012-06-26 21:23:42 -0700 | [diff] [blame] | 171 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | } |
| 173 | |
David S. Miller | 62566ca | 2012-06-26 21:23:42 -0700 | [diff] [blame] | 174 | nlh = nlmsg_put(ub->skb, 0, ub->qlen, 0, |
| 175 | size - NLMSG_ALIGN(sizeof(*nlh)), 0); |
| 176 | if (!nlh) { |
Dan Carpenter | f7eadaf | 2012-06-30 01:48:53 +0000 | [diff] [blame] | 177 | kfree_skb(ub->skb); |
David S. Miller | 62566ca | 2012-06-26 21:23:42 -0700 | [diff] [blame] | 178 | ub->skb = NULL; |
| 179 | goto unlock; |
| 180 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | ub->qlen++; |
| 182 | |
David S. Miller | 62566ca | 2012-06-26 21:23:42 -0700 | [diff] [blame] | 183 | pm = nlmsg_data(nlh); |
Mathias Krause | ca0a106 | 2013-09-30 22:05:07 +0200 | [diff] [blame^] | 184 | memset(pm, 0, sizeof(*pm)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
| 186 | /* Fill in the ulog data */ |
| 187 | pm->version = EBT_ULOG_VERSION; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 188 | kt = ktime_get_real(); |
| 189 | pm->stamp = ktime_to_timeval(kt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | if (ub->qlen == 1) |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 191 | ub->skb->tstamp = kt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | pm->data_len = copy_len; |
Thomas Graf | 82e91ff | 2006-11-09 15:19:14 -0800 | [diff] [blame] | 193 | pm->mark = skb->mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | pm->hook = hooknr; |
| 195 | if (uloginfo->prefix != NULL) |
| 196 | strcpy(pm->prefix, uloginfo->prefix); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | |
| 198 | if (in) { |
| 199 | strcpy(pm->physindev, in->name); |
| 200 | /* If in isn't a bridge, then physindev==indev */ |
Jiri Pirko | f350a0a8 | 2010-06-15 06:50:45 +0000 | [diff] [blame] | 201 | if (br_port_exists(in)) |
| 202 | /* rcu_read_lock()ed by nf_hook_slow */ |
| 203 | strcpy(pm->indev, br_port_get_rcu(in)->br->dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | else |
| 205 | strcpy(pm->indev, in->name); |
Mathias Krause | ca0a106 | 2013-09-30 22:05:07 +0200 | [diff] [blame^] | 206 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | |
| 208 | if (out) { |
| 209 | /* If out exists, then out is a bridge port */ |
| 210 | strcpy(pm->physoutdev, out->name); |
Jiri Pirko | f350a0a8 | 2010-06-15 06:50:45 +0000 | [diff] [blame] | 211 | /* rcu_read_lock()ed by nf_hook_slow */ |
| 212 | strcpy(pm->outdev, br_port_get_rcu(out)->br->dev->name); |
Mathias Krause | ca0a106 | 2013-09-30 22:05:07 +0200 | [diff] [blame^] | 213 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | |
| 215 | if (skb_copy_bits(skb, -ETH_HLEN, pm->data, copy_len) < 0) |
| 216 | BUG(); |
| 217 | |
| 218 | if (ub->qlen > 1) |
| 219 | ub->lastnlh->nlmsg_flags |= NLM_F_MULTI; |
| 220 | |
| 221 | ub->lastnlh = nlh; |
| 222 | |
| 223 | if (ub->qlen >= uloginfo->qthreshold) |
Gao feng | 5b175b7 | 2013-03-24 23:50:43 +0000 | [diff] [blame] | 224 | ulog_send(ebt, group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | else if (!timer_pending(&ub->timer)) { |
| 226 | ub->timer.expires = jiffies + flushtimeout * HZ / 100; |
| 227 | add_timer(&ub->timer); |
| 228 | } |
| 229 | |
| 230 | unlock: |
| 231 | spin_unlock_bh(lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | } |
| 233 | |
Bart De Schuymer | d5228a4 | 2005-12-13 23:14:08 -0800 | [diff] [blame] | 234 | /* this function is registered with the netfilter core */ |
Hans Schillstrom | 8cdb46d | 2013-05-15 01:23:45 +0000 | [diff] [blame] | 235 | static void ebt_log_packet(struct net *net, u_int8_t pf, unsigned int hooknum, |
Bart De Schuymer | d5228a4 | 2005-12-13 23:14:08 -0800 | [diff] [blame] | 236 | const struct sk_buff *skb, const struct net_device *in, |
| 237 | const struct net_device *out, const struct nf_loginfo *li, |
| 238 | const char *prefix) |
| 239 | { |
| 240 | struct ebt_ulog_info loginfo; |
| 241 | |
| 242 | if (!li || li->type != NF_LOG_TYPE_ULOG) { |
| 243 | loginfo.nlgroup = EBT_ULOG_DEFAULT_NLGROUP; |
| 244 | loginfo.cprange = 0; |
| 245 | loginfo.qthreshold = EBT_ULOG_DEFAULT_QTHRESHOLD; |
| 246 | loginfo.prefix[0] = '\0'; |
| 247 | } else { |
| 248 | loginfo.nlgroup = li->u.ulog.group; |
| 249 | loginfo.cprange = li->u.ulog.copy_len; |
| 250 | loginfo.qthreshold = li->u.ulog.qthreshold; |
| 251 | strlcpy(loginfo.prefix, prefix, sizeof(loginfo.prefix)); |
| 252 | } |
| 253 | |
Hans Schillstrom | 8cdb46d | 2013-05-15 01:23:45 +0000 | [diff] [blame] | 254 | ebt_ulog_packet(net, hooknum, skb, in, out, &loginfo, prefix); |
Bart De Schuymer | d5228a4 | 2005-12-13 23:14:08 -0800 | [diff] [blame] | 255 | } |
| 256 | |
Jan Engelhardt | 2d06d4a | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 257 | static unsigned int |
Jan Engelhardt | 4b560b4 | 2009-07-05 19:43:26 +0200 | [diff] [blame] | 258 | 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] | 259 | { |
Hans Schillstrom | 8cdb46d | 2013-05-15 01:23:45 +0000 | [diff] [blame] | 260 | struct net *net = dev_net(par->in ? par->in : par->out); |
| 261 | |
| 262 | ebt_ulog_packet(net, par->hooknum, skb, par->in, par->out, |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 263 | par->targinfo, NULL); |
Jan Engelhardt | 0ac6ab1 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 264 | return EBT_CONTINUE; |
Bart De Schuymer | d5228a4 | 2005-12-13 23:14:08 -0800 | [diff] [blame] | 265 | } |
| 266 | |
Jan Engelhardt | 135367b | 2010-03-19 17:16:42 +0100 | [diff] [blame] | 267 | static int ebt_ulog_tg_check(const struct xt_tgchk_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | { |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 269 | struct ebt_ulog_info *uloginfo = par->targinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | |
Pablo Neira Ayuso | de94c45 | 2013-05-22 22:42:37 +0000 | [diff] [blame] | 271 | if (!par->net->xt.ebt_ulog_warn_deprecated) { |
| 272 | pr_info("ebt_ulog is deprecated and it will be removed soon, " |
| 273 | "use ebt_nflog instead\n"); |
| 274 | par->net->xt.ebt_ulog_warn_deprecated = true; |
| 275 | } |
| 276 | |
Jan Engelhardt | 18219d3 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 277 | if (uloginfo->nlgroup > 31) |
Jan Engelhardt | d6b00a5 | 2010-03-25 16:34:45 +0100 | [diff] [blame] | 278 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | |
| 280 | uloginfo->prefix[EBT_ULOG_PREFIX_LEN - 1] = '\0'; |
| 281 | |
| 282 | if (uloginfo->qthreshold > EBT_ULOG_MAX_QLEN) |
| 283 | uloginfo->qthreshold = EBT_ULOG_MAX_QLEN; |
| 284 | |
Jan Engelhardt | d6b00a5 | 2010-03-25 16:34:45 +0100 | [diff] [blame] | 285 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | } |
| 287 | |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 288 | static struct xt_target ebt_ulog_tg_reg __read_mostly = { |
| 289 | .name = "ulog", |
Jan Engelhardt | 001a18d | 2008-10-08 11:35:14 +0200 | [diff] [blame] | 290 | .revision = 0, |
| 291 | .family = NFPROTO_BRIDGE, |
Jan Engelhardt | 2d06d4a | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 292 | .target = ebt_ulog_tg, |
| 293 | .checkentry = ebt_ulog_tg_check, |
Florian Westphal | fc0e3df | 2010-02-15 18:16:26 +0100 | [diff] [blame] | 294 | .targetsize = sizeof(struct ebt_ulog_info), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | .me = THIS_MODULE, |
| 296 | }; |
| 297 | |
Eric Leblond | 704b3ea | 2009-03-26 01:03:23 -0700 | [diff] [blame] | 298 | static struct nf_logger ebt_ulog_logger __read_mostly = { |
Eric Leblond | 7249dee | 2009-03-26 01:04:28 -0700 | [diff] [blame] | 299 | .name = "ebt_ulog", |
Bart De Schuymer | d5228a4 | 2005-12-13 23:14:08 -0800 | [diff] [blame] | 300 | .logfn = &ebt_log_packet, |
| 301 | .me = THIS_MODULE, |
| 302 | }; |
| 303 | |
Gao feng | 5b175b7 | 2013-03-24 23:50:43 +0000 | [diff] [blame] | 304 | static int __net_init ebt_ulog_net_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | { |
Jan Engelhardt | 19eda87 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 306 | int i; |
Gao feng | 5b175b7 | 2013-03-24 23:50:43 +0000 | [diff] [blame] | 307 | struct ebt_ulog_net *ebt = ebt_ulog_pernet(net); |
| 308 | |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 309 | struct netlink_kernel_cfg cfg = { |
| 310 | .groups = EBT_ULOG_MAXNLGROUPS, |
| 311 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | /* initialize ulog_buffers */ |
| 314 | for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) { |
Gao feng | 5b175b7 | 2013-03-24 23:50:43 +0000 | [diff] [blame] | 315 | ebt->nlgroup[i] = i; |
| 316 | setup_timer(&ebt->ulog_buffers[i].timer, ulog_timer, |
| 317 | (unsigned long)&ebt->nlgroup[i]); |
| 318 | spin_lock_init(&ebt->ulog_buffers[i].lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | } |
| 320 | |
Gao feng | 5b175b7 | 2013-03-24 23:50:43 +0000 | [diff] [blame] | 321 | ebt->ebtulognl = netlink_kernel_create(net, NETLINK_NFLOG, &cfg); |
| 322 | if (!ebt->ebtulognl) |
| 323 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | |
Gao feng | 5b175b7 | 2013-03-24 23:50:43 +0000 | [diff] [blame] | 325 | nf_log_set(net, NFPROTO_BRIDGE, &ebt_ulog_logger); |
| 326 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | } |
| 328 | |
Gao feng | 5b175b7 | 2013-03-24 23:50:43 +0000 | [diff] [blame] | 329 | static void __net_exit ebt_ulog_net_fini(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | int i; |
Gao feng | 5b175b7 | 2013-03-24 23:50:43 +0000 | [diff] [blame] | 332 | struct ebt_ulog_net *ebt = ebt_ulog_pernet(net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | |
Gao feng | 5b175b7 | 2013-03-24 23:50:43 +0000 | [diff] [blame] | 334 | nf_log_unset(net, &ebt_ulog_logger); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) { |
Gao feng | 5b175b7 | 2013-03-24 23:50:43 +0000 | [diff] [blame] | 336 | ebt_ulog_buff_t *ub = &ebt->ulog_buffers[i]; |
Ying Xue | 25cc4ae | 2013-02-03 20:32:57 +0000 | [diff] [blame] | 337 | del_timer(&ub->timer); |
Gao feng | fa900b9 | 2013-02-18 16:59:10 +0000 | [diff] [blame] | 338 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | if (ub->skb) { |
| 340 | kfree_skb(ub->skb); |
| 341 | ub->skb = NULL; |
| 342 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | } |
Gao feng | 5b175b7 | 2013-03-24 23:50:43 +0000 | [diff] [blame] | 344 | netlink_kernel_release(ebt->ebtulognl); |
| 345 | } |
| 346 | |
| 347 | static struct pernet_operations ebt_ulog_net_ops = { |
| 348 | .init = ebt_ulog_net_init, |
| 349 | .exit = ebt_ulog_net_fini, |
| 350 | .id = &ebt_ulog_net_id, |
| 351 | .size = sizeof(struct ebt_ulog_net), |
| 352 | }; |
| 353 | |
| 354 | static int __init ebt_ulog_init(void) |
| 355 | { |
| 356 | int ret; |
| 357 | |
| 358 | if (nlbufsiz >= 128*1024) { |
| 359 | pr_warn("Netlink buffer has to be <= 128kB," |
| 360 | "please try a smaller nlbufsiz parameter.\n"); |
| 361 | return -EINVAL; |
| 362 | } |
| 363 | |
| 364 | ret = register_pernet_subsys(&ebt_ulog_net_ops); |
| 365 | if (ret) |
| 366 | goto out_pernet; |
| 367 | |
| 368 | ret = xt_register_target(&ebt_ulog_tg_reg); |
| 369 | if (ret) |
| 370 | goto out_target; |
| 371 | |
| 372 | nf_log_register(NFPROTO_BRIDGE, &ebt_ulog_logger); |
| 373 | |
| 374 | return 0; |
| 375 | |
| 376 | out_target: |
| 377 | unregister_pernet_subsys(&ebt_ulog_net_ops); |
| 378 | out_pernet: |
| 379 | return ret; |
| 380 | } |
| 381 | |
| 382 | static void __exit ebt_ulog_fini(void) |
| 383 | { |
| 384 | nf_log_unregister(&ebt_ulog_logger); |
| 385 | xt_unregister_target(&ebt_ulog_tg_reg); |
| 386 | unregister_pernet_subsys(&ebt_ulog_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | } |
| 388 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 389 | module_init(ebt_ulog_init); |
| 390 | module_exit(ebt_ulog_fini); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | MODULE_LICENSE("GPL"); |
| 392 | MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>"); |
Jan Engelhardt | f776c4c | 2008-01-31 04:00:30 -0800 | [diff] [blame] | 393 | MODULE_DESCRIPTION("Ebtables: Packet logging to netlink using ULOG"); |