Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * netfilter module for userspace packet logging daemons |
| 3 | * |
| 4 | * (C) 2000-2004 by Harald Welte <laforge@netfilter.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * (C) 1999-2001 Paul `Rusty' Russell |
| 6 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> |
Patrick McHardy | f229f6c | 2013-04-06 15:24:29 +0200 | [diff] [blame] | 7 | * (C) 2005-2007 Patrick McHardy <kaber@trash.net> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 as |
| 11 | * published by the Free Software Foundation. |
| 12 | * |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +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 | * |
Holger Eitzenberger | c2db292 | 2006-02-04 02:13:14 -0800 | [diff] [blame] | 25 | * Actually you should use nlbufsiz a bit smaller than PAGE_SIZE, since |
| 26 | * nlbufsiz is used with alloc_skb, which adds another |
| 27 | * sizeof(struct skb_shared_info). Use NLMSG_GOODSIZE instead. |
| 28 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | * flushtimeout: |
| 30 | * Specify, after how many hundredths of a second the queue should be |
| 31 | * flushed even if it is not full yet. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | */ |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 33 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/spinlock.h> |
| 36 | #include <linux/socket.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 37 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include <linux/skbuff.h> |
| 39 | #include <linux/kernel.h> |
| 40 | #include <linux/timer.h> |
Hong zhi guo | 573ce26 | 2013-03-27 06:47:04 +0000 | [diff] [blame] | 41 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #include <linux/netdevice.h> |
| 43 | #include <linux/mm.h> |
| 44 | #include <linux/moduleparam.h> |
| 45 | #include <linux/netfilter.h> |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 46 | #include <linux/netfilter/x_tables.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <linux/netfilter_ipv4/ipt_ULOG.h> |
Patrick McHardy | f01ffbd | 2007-12-17 22:38:49 -0800 | [diff] [blame] | 48 | #include <net/netfilter/nf_log.h> |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 49 | #include <net/netns/generic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #include <net/sock.h> |
| 51 | #include <linux/bitops.h> |
Patrick McHardy | 01102e7 | 2007-04-12 14:27:03 -0700 | [diff] [blame] | 52 | #include <asm/unaligned.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
| 54 | MODULE_LICENSE("GPL"); |
| 55 | MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>"); |
Jan Engelhardt | 2ae15b6 | 2008-01-14 23:42:28 -0800 | [diff] [blame] | 56 | MODULE_DESCRIPTION("Xtables: packet logging to netlink using ULOG"); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 57 | MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_NFLOG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
| 59 | #define ULOG_NL_EVENT 111 /* Harald's favorite number */ |
| 60 | #define ULOG_MAXNLGROUPS 32 /* numer of nlgroups */ |
| 61 | |
Holger Eitzenberger | c2db292 | 2006-02-04 02:13:14 -0800 | [diff] [blame] | 62 | static unsigned int nlbufsiz = NLMSG_GOODSIZE; |
Patrick McHardy | e7be699 | 2006-01-05 12:19:46 -0800 | [diff] [blame] | 63 | module_param(nlbufsiz, uint, 0400); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | MODULE_PARM_DESC(nlbufsiz, "netlink buffer size"); |
| 65 | |
| 66 | static unsigned int flushtimeout = 10; |
Patrick McHardy | e7be699 | 2006-01-05 12:19:46 -0800 | [diff] [blame] | 67 | module_param(flushtimeout, uint, 0600); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | MODULE_PARM_DESC(flushtimeout, "buffer flush timeout (hundredths of a second)"); |
| 69 | |
Rusty Russell | eb93992 | 2011-12-19 14:08:01 +0000 | [diff] [blame] | 70 | static bool nflog = true; |
Patrick McHardy | e7be699 | 2006-01-05 12:19:46 -0800 | [diff] [blame] | 71 | module_param(nflog, bool, 0400); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | MODULE_PARM_DESC(nflog, "register as internal netfilter logging module"); |
| 73 | |
| 74 | /* global data structures */ |
| 75 | |
| 76 | typedef struct { |
| 77 | unsigned int qlen; /* number of nlmsgs' in the skb */ |
| 78 | struct nlmsghdr *lastnlh; /* netlink header of last msg in skb */ |
| 79 | struct sk_buff *skb; /* the pre-allocated skb */ |
| 80 | struct timer_list timer; /* the timer function */ |
| 81 | } ulog_buff_t; |
| 82 | |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 83 | static int ulog_net_id __read_mostly; |
| 84 | struct ulog_net { |
| 85 | unsigned int nlgroup[ULOG_MAXNLGROUPS]; |
| 86 | ulog_buff_t ulog_buffers[ULOG_MAXNLGROUPS]; |
| 87 | struct sock *nflognl; |
| 88 | spinlock_t lock; |
| 89 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 91 | static struct ulog_net *ulog_pernet(struct net *net) |
| 92 | { |
| 93 | return net_generic(net, ulog_net_id); |
| 94 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
| 96 | /* send one ulog_buff_t to userspace */ |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 97 | static void ulog_send(struct ulog_net *ulog, unsigned int nlgroupnum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | { |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 99 | ulog_buff_t *ub = &ulog->ulog_buffers[nlgroupnum]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
Ying Xue | 25cc4ae | 2013-02-03 20:32:57 +0000 | [diff] [blame] | 101 | pr_debug("ulog_send: timer is deleting\n"); |
| 102 | del_timer(&ub->timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
Mark Huang | dcb7cd9 | 2006-08-13 18:57:54 -0700 | [diff] [blame] | 104 | if (!ub->skb) { |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 105 | pr_debug("ulog_send: nothing to send\n"); |
Mark Huang | dcb7cd9 | 2006-08-13 18:57:54 -0700 | [diff] [blame] | 106 | return; |
| 107 | } |
| 108 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | /* last nlmsg needs NLMSG_DONE */ |
| 110 | if (ub->qlen > 1) |
| 111 | ub->lastnlh->nlmsg_type = NLMSG_DONE; |
| 112 | |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 113 | NETLINK_CB(ub->skb).dst_group = nlgroupnum + 1; |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 114 | pr_debug("throwing %d packets to netlink group %u\n", |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 115 | ub->qlen, nlgroupnum + 1); |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 116 | netlink_broadcast(ulog->nflognl, ub->skb, 0, nlgroupnum + 1, |
| 117 | GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
| 119 | ub->qlen = 0; |
| 120 | ub->skb = NULL; |
| 121 | ub->lastnlh = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | } |
| 123 | |
| 124 | |
| 125 | /* timer function to flush queue in flushtimeout time */ |
| 126 | static void ulog_timer(unsigned long data) |
| 127 | { |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 128 | struct ulog_net *ulog = container_of((void *)data, |
| 129 | struct ulog_net, |
| 130 | nlgroup[*(unsigned int *)data]); |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 131 | pr_debug("timer function called, calling ulog_send\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
| 133 | /* lock to protect against somebody modifying our structure |
| 134 | * from ipt_ulog_target at the same time */ |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 135 | spin_lock_bh(&ulog->lock); |
| 136 | ulog_send(ulog, data); |
| 137 | spin_unlock_bh(&ulog->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | static struct sk_buff *ulog_alloc_skb(unsigned int size) |
| 141 | { |
| 142 | struct sk_buff *skb; |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 143 | unsigned int n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
| 145 | /* alloc skb which should be big enough for a whole |
| 146 | * multipart message. WARNING: has to be <= 131000 |
| 147 | * due to slab allocator restrictions */ |
| 148 | |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 149 | n = max(size, nlbufsiz); |
Joe Perches | 0a9ee81 | 2011-08-29 14:17:25 -0700 | [diff] [blame] | 150 | skb = alloc_skb(n, GFP_ATOMIC | __GFP_NOWARN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | if (!skb) { |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 152 | if (n > size) { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 153 | /* try to allocate only as much as we need for |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 154 | * current packet */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 156 | skb = alloc_skb(size, GFP_ATOMIC); |
| 157 | if (!skb) |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 158 | pr_debug("cannot even allocate %ub\n", size); |
Patrick McHardy | ad2ad0f | 2006-02-04 02:13:57 -0800 | [diff] [blame] | 159 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | } |
| 161 | |
| 162 | return skb; |
| 163 | } |
| 164 | |
Hans Schillstrom | 8cdb46d | 2013-05-15 01:23:45 +0000 | [diff] [blame] | 165 | static void ipt_ulog_packet(struct net *net, |
| 166 | unsigned int hooknum, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | const struct sk_buff *skb, |
| 168 | const struct net_device *in, |
| 169 | const struct net_device *out, |
| 170 | const struct ipt_ulog_info *loginfo, |
| 171 | const char *prefix) |
| 172 | { |
| 173 | ulog_buff_t *ub; |
| 174 | ulog_packet_msg_t *pm; |
| 175 | size_t size, copy_len; |
| 176 | struct nlmsghdr *nlh; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 177 | struct timeval tv; |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 178 | struct ulog_net *ulog = ulog_pernet(net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | |
| 180 | /* ffs == find first bit set, necessary because userspace |
| 181 | * is already shifting groupnumber, but we need unshifted. |
| 182 | * ffs() returns [1..32], we need [0..31] */ |
| 183 | unsigned int groupnum = ffs(loginfo->nl_group) - 1; |
| 184 | |
| 185 | /* calculate the size of the skb needed */ |
Jan Engelhardt | 7c4e36b | 2007-07-07 22:19:08 -0700 | [diff] [blame] | 186 | if (loginfo->copy_range == 0 || loginfo->copy_range > skb->len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | copy_len = skb->len; |
Jan Engelhardt | 7c4e36b | 2007-07-07 22:19:08 -0700 | [diff] [blame] | 188 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | copy_len = loginfo->copy_range; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | |
Hong zhi guo | 573ce26 | 2013-03-27 06:47:04 +0000 | [diff] [blame] | 191 | size = nlmsg_total_size(sizeof(*pm) + copy_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 193 | ub = &ulog->ulog_buffers[groupnum]; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 194 | |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 195 | spin_lock_bh(&ulog->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
| 197 | if (!ub->skb) { |
| 198 | if (!(ub->skb = ulog_alloc_skb(size))) |
| 199 | goto alloc_failure; |
| 200 | } else if (ub->qlen >= loginfo->qthreshold || |
| 201 | size > skb_tailroom(ub->skb)) { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 202 | /* either the queue len is too high or we don't have |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | * enough room in nlskb left. send it to userspace. */ |
| 204 | |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 205 | ulog_send(ulog, groupnum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | |
| 207 | if (!(ub->skb = ulog_alloc_skb(size))) |
| 208 | goto alloc_failure; |
| 209 | } |
| 210 | |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 211 | pr_debug("qlen %d, qthreshold %Zu\n", ub->qlen, loginfo->qthreshold); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
David S. Miller | c2bd4ba | 2012-06-26 21:30:49 -0700 | [diff] [blame] | 213 | nlh = nlmsg_put(ub->skb, 0, ub->qlen, ULOG_NL_EVENT, |
| 214 | sizeof(*pm)+copy_len, 0); |
| 215 | if (!nlh) { |
| 216 | pr_debug("error during nlmsg_put\n"); |
| 217 | goto out_unlock; |
| 218 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | ub->qlen++; |
| 220 | |
David S. Miller | c2bd4ba | 2012-06-26 21:30:49 -0700 | [diff] [blame] | 221 | pm = nlmsg_data(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | |
| 223 | /* We might not have a timestamp, get one */ |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 224 | if (skb->tstamp.tv64 == 0) |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 225 | __net_timestamp((struct sk_buff *)skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | |
| 227 | /* copy hook, prefix, timestamp, payload, etc. */ |
| 228 | pm->data_len = copy_len; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 229 | tv = ktime_to_timeval(skb->tstamp); |
| 230 | put_unaligned(tv.tv_sec, &pm->timestamp_sec); |
| 231 | put_unaligned(tv.tv_usec, &pm->timestamp_usec); |
Patrick McHardy | 01102e7 | 2007-04-12 14:27:03 -0700 | [diff] [blame] | 232 | put_unaligned(skb->mark, &pm->mark); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | pm->hook = hooknum; |
| 234 | if (prefix != NULL) |
| 235 | strncpy(pm->prefix, prefix, sizeof(pm->prefix)); |
| 236 | else if (loginfo->prefix[0] != '\0') |
| 237 | strncpy(pm->prefix, loginfo->prefix, sizeof(pm->prefix)); |
| 238 | else |
| 239 | *(pm->prefix) = '\0'; |
| 240 | |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 241 | if (in && in->hard_header_len > 0 && |
| 242 | skb->mac_header != skb->network_header && |
| 243 | in->hard_header_len <= ULOG_MAC_LEN) { |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 244 | memcpy(pm->mac, skb_mac_header(skb), in->hard_header_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | pm->mac_len = in->hard_header_len; |
| 246 | } else |
| 247 | pm->mac_len = 0; |
| 248 | |
| 249 | if (in) |
| 250 | strncpy(pm->indev_name, in->name, sizeof(pm->indev_name)); |
| 251 | else |
| 252 | pm->indev_name[0] = '\0'; |
| 253 | |
| 254 | if (out) |
| 255 | strncpy(pm->outdev_name, out->name, sizeof(pm->outdev_name)); |
| 256 | else |
| 257 | pm->outdev_name[0] = '\0'; |
| 258 | |
| 259 | /* copy_len <= skb->len, so can't fail. */ |
| 260 | if (skb_copy_bits(skb, 0, pm->payload, copy_len) < 0) |
| 261 | BUG(); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 262 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | /* check if we are building multi-part messages */ |
Jan Engelhardt | 7c4e36b | 2007-07-07 22:19:08 -0700 | [diff] [blame] | 264 | if (ub->qlen > 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | ub->lastnlh->nlmsg_flags |= NLM_F_MULTI; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | |
| 267 | ub->lastnlh = nlh; |
| 268 | |
| 269 | /* if timer isn't already running, start it */ |
| 270 | if (!timer_pending(&ub->timer)) { |
| 271 | ub->timer.expires = jiffies + flushtimeout * HZ / 100; |
| 272 | add_timer(&ub->timer); |
| 273 | } |
| 274 | |
| 275 | /* if threshold is reached, send message to userspace */ |
| 276 | if (ub->qlen >= loginfo->qthreshold) { |
| 277 | if (loginfo->qthreshold > 1) |
| 278 | nlh->nlmsg_type = NLMSG_DONE; |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 279 | ulog_send(ulog, groupnum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | } |
David S. Miller | c2bd4ba | 2012-06-26 21:30:49 -0700 | [diff] [blame] | 281 | out_unlock: |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 282 | spin_unlock_bh(&ulog->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | |
| 284 | return; |
| 285 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | alloc_failure: |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 287 | pr_debug("Error building netlink message\n"); |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 288 | spin_unlock_bh(&ulog->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | } |
| 290 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 291 | static unsigned int |
Jan Engelhardt | 4b560b4 | 2009-07-05 19:43:26 +0200 | [diff] [blame] | 292 | ulog_tg(struct sk_buff *skb, const struct xt_action_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | { |
Hans Schillstrom | 8cdb46d | 2013-05-15 01:23:45 +0000 | [diff] [blame] | 294 | struct net *net = dev_net(par->in ? par->in : par->out); |
| 295 | |
| 296 | ipt_ulog_packet(net, par->hooknum, skb, par->in, par->out, |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 297 | par->targinfo, NULL); |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 298 | return XT_CONTINUE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | } |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 300 | |
Hans Schillstrom | 8cdb46d | 2013-05-15 01:23:45 +0000 | [diff] [blame] | 301 | static void ipt_logfn(struct net *net, |
| 302 | u_int8_t pf, |
Harald Welte | 608c8e4 | 2005-08-09 19:58:27 -0700 | [diff] [blame] | 303 | unsigned int hooknum, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | const struct sk_buff *skb, |
| 305 | const struct net_device *in, |
| 306 | const struct net_device *out, |
Harald Welte | 608c8e4 | 2005-08-09 19:58:27 -0700 | [diff] [blame] | 307 | const struct nf_loginfo *li, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | const char *prefix) |
| 309 | { |
Harald Welte | 608c8e4 | 2005-08-09 19:58:27 -0700 | [diff] [blame] | 310 | struct ipt_ulog_info loginfo; |
| 311 | |
| 312 | if (!li || li->type != NF_LOG_TYPE_ULOG) { |
| 313 | loginfo.nl_group = ULOG_DEFAULT_NLGROUP; |
| 314 | loginfo.copy_range = 0; |
| 315 | loginfo.qthreshold = ULOG_DEFAULT_QTHRESHOLD; |
| 316 | loginfo.prefix[0] = '\0'; |
| 317 | } else { |
| 318 | loginfo.nl_group = li->u.ulog.group; |
| 319 | loginfo.copy_range = li->u.ulog.copy_len; |
| 320 | loginfo.qthreshold = li->u.ulog.qthreshold; |
| 321 | strlcpy(loginfo.prefix, prefix, sizeof(loginfo.prefix)); |
| 322 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
Hans Schillstrom | 8cdb46d | 2013-05-15 01:23:45 +0000 | [diff] [blame] | 324 | ipt_ulog_packet(net, hooknum, skb, in, out, &loginfo, prefix); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | } |
| 326 | |
Jan Engelhardt | 135367b | 2010-03-19 17:16:42 +0100 | [diff] [blame] | 327 | static int ulog_tg_check(const struct xt_tgchk_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | { |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 329 | const struct ipt_ulog_info *loginfo = par->targinfo; |
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 | if (loginfo->prefix[sizeof(loginfo->prefix) - 1] != '\0') { |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 332 | pr_debug("prefix not null-terminated\n"); |
Jan Engelhardt | d6b00a5 | 2010-03-25 16:34:45 +0100 | [diff] [blame] | 333 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | if (loginfo->qthreshold > ULOG_MAX_QLEN) { |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 336 | pr_debug("queue threshold %Zu > MAX_QLEN\n", |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 337 | loginfo->qthreshold); |
Jan Engelhardt | d6b00a5 | 2010-03-25 16:34:45 +0100 | [diff] [blame] | 338 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | } |
Jan Engelhardt | d6b00a5 | 2010-03-25 16:34:45 +0100 | [diff] [blame] | 340 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | } |
| 342 | |
Patrick McHardy | b076deb | 2007-04-12 22:17:05 -0700 | [diff] [blame] | 343 | #ifdef CONFIG_COMPAT |
| 344 | struct compat_ipt_ulog_info { |
| 345 | compat_uint_t nl_group; |
| 346 | compat_size_t copy_range; |
| 347 | compat_size_t qthreshold; |
| 348 | char prefix[ULOG_PREFIX_LEN]; |
| 349 | }; |
| 350 | |
Jan Engelhardt | 739674f | 2009-06-26 08:23:19 +0200 | [diff] [blame] | 351 | static void ulog_tg_compat_from_user(void *dst, const void *src) |
Patrick McHardy | b076deb | 2007-04-12 22:17:05 -0700 | [diff] [blame] | 352 | { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 353 | const struct compat_ipt_ulog_info *cl = src; |
Patrick McHardy | b076deb | 2007-04-12 22:17:05 -0700 | [diff] [blame] | 354 | struct ipt_ulog_info l = { |
| 355 | .nl_group = cl->nl_group, |
| 356 | .copy_range = cl->copy_range, |
| 357 | .qthreshold = cl->qthreshold, |
| 358 | }; |
| 359 | |
| 360 | memcpy(l.prefix, cl->prefix, sizeof(l.prefix)); |
| 361 | memcpy(dst, &l, sizeof(l)); |
| 362 | } |
| 363 | |
Jan Engelhardt | 739674f | 2009-06-26 08:23:19 +0200 | [diff] [blame] | 364 | static int ulog_tg_compat_to_user(void __user *dst, const void *src) |
Patrick McHardy | b076deb | 2007-04-12 22:17:05 -0700 | [diff] [blame] | 365 | { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 366 | const struct ipt_ulog_info *l = src; |
Patrick McHardy | b076deb | 2007-04-12 22:17:05 -0700 | [diff] [blame] | 367 | struct compat_ipt_ulog_info cl = { |
| 368 | .nl_group = l->nl_group, |
| 369 | .copy_range = l->copy_range, |
| 370 | .qthreshold = l->qthreshold, |
| 371 | }; |
| 372 | |
| 373 | memcpy(cl.prefix, l->prefix, sizeof(cl.prefix)); |
| 374 | return copy_to_user(dst, &cl, sizeof(cl)) ? -EFAULT : 0; |
| 375 | } |
| 376 | #endif /* CONFIG_COMPAT */ |
| 377 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 378 | static struct xt_target ulog_tg_reg __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | .name = "ULOG", |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 380 | .family = NFPROTO_IPV4, |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 381 | .target = ulog_tg, |
Patrick McHardy | 1d5cd90 | 2006-03-20 18:01:14 -0800 | [diff] [blame] | 382 | .targetsize = sizeof(struct ipt_ulog_info), |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 383 | .checkentry = ulog_tg_check, |
Patrick McHardy | b076deb | 2007-04-12 22:17:05 -0700 | [diff] [blame] | 384 | #ifdef CONFIG_COMPAT |
| 385 | .compatsize = sizeof(struct compat_ipt_ulog_info), |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 386 | .compat_from_user = ulog_tg_compat_from_user, |
| 387 | .compat_to_user = ulog_tg_compat_to_user, |
Patrick McHardy | b076deb | 2007-04-12 22:17:05 -0700 | [diff] [blame] | 388 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | .me = THIS_MODULE, |
| 390 | }; |
| 391 | |
Eric Leblond | ca735b3 | 2009-03-16 14:54:21 +0100 | [diff] [blame] | 392 | static struct nf_logger ipt_ulog_logger __read_mostly = { |
Harald Welte | 608c8e4 | 2005-08-09 19:58:27 -0700 | [diff] [blame] | 393 | .name = "ipt_ULOG", |
Patrick McHardy | 1d5cd90 | 2006-03-20 18:01:14 -0800 | [diff] [blame] | 394 | .logfn = ipt_logfn, |
Harald Welte | 608c8e4 | 2005-08-09 19:58:27 -0700 | [diff] [blame] | 395 | .me = THIS_MODULE, |
| 396 | }; |
| 397 | |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 398 | static int __net_init ulog_tg_net_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | { |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 400 | int i; |
| 401 | struct ulog_net *ulog = ulog_pernet(net); |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 402 | struct netlink_kernel_cfg cfg = { |
| 403 | .groups = ULOG_MAXNLGROUPS, |
| 404 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 406 | spin_lock_init(&ulog->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | /* initialize ulog_buffers */ |
Patrick McHardy | e6f689d | 2007-03-23 11:16:30 -0700 | [diff] [blame] | 408 | for (i = 0; i < ULOG_MAXNLGROUPS; i++) |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 409 | setup_timer(&ulog->ulog_buffers[i].timer, ulog_timer, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 411 | ulog->nflognl = netlink_kernel_create(net, NETLINK_NFLOG, &cfg); |
| 412 | if (!ulog->nflognl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | return -ENOMEM; |
| 414 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | if (nflog) |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 416 | nf_log_set(net, NFPROTO_IPV4, &ipt_ulog_logger); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 417 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | return 0; |
| 419 | } |
| 420 | |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 421 | static void __net_exit ulog_tg_net_exit(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | { |
| 423 | ulog_buff_t *ub; |
| 424 | int i; |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 425 | struct ulog_net *ulog = ulog_pernet(net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | |
| 427 | if (nflog) |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 428 | nf_log_unset(net, &ipt_ulog_logger); |
| 429 | |
| 430 | netlink_kernel_release(ulog->nflognl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | |
| 432 | /* remove pending timers and free allocated skb's */ |
| 433 | for (i = 0; i < ULOG_MAXNLGROUPS; i++) { |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 434 | ub = &ulog->ulog_buffers[i]; |
Ying Xue | 25cc4ae | 2013-02-03 20:32:57 +0000 | [diff] [blame] | 435 | pr_debug("timer is deleting\n"); |
| 436 | del_timer(&ub->timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | |
| 438 | if (ub->skb) { |
| 439 | kfree_skb(ub->skb); |
| 440 | ub->skb = NULL; |
| 441 | } |
| 442 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | } |
| 444 | |
Gao feng | 3554306 | 2013-03-24 23:50:44 +0000 | [diff] [blame] | 445 | static struct pernet_operations ulog_tg_net_ops = { |
| 446 | .init = ulog_tg_net_init, |
| 447 | .exit = ulog_tg_net_exit, |
| 448 | .id = &ulog_net_id, |
| 449 | .size = sizeof(struct ulog_net), |
| 450 | }; |
| 451 | |
| 452 | static int __init ulog_tg_init(void) |
| 453 | { |
| 454 | int ret; |
| 455 | pr_debug("init module\n"); |
| 456 | |
| 457 | if (nlbufsiz > 128*1024) { |
| 458 | pr_warn("Netlink buffer has to be <= 128kB\n"); |
| 459 | return -EINVAL; |
| 460 | } |
| 461 | |
| 462 | ret = register_pernet_subsys(&ulog_tg_net_ops); |
| 463 | if (ret) |
| 464 | goto out_pernet; |
| 465 | |
| 466 | ret = xt_register_target(&ulog_tg_reg); |
| 467 | if (ret < 0) |
| 468 | goto out_target; |
| 469 | |
| 470 | if (nflog) |
| 471 | nf_log_register(NFPROTO_IPV4, &ipt_ulog_logger); |
| 472 | |
| 473 | return 0; |
| 474 | |
| 475 | out_target: |
| 476 | unregister_pernet_subsys(&ulog_tg_net_ops); |
| 477 | out_pernet: |
| 478 | return ret; |
| 479 | } |
| 480 | |
| 481 | static void __exit ulog_tg_exit(void) |
| 482 | { |
| 483 | pr_debug("cleanup_module\n"); |
| 484 | if (nflog) |
| 485 | nf_log_unregister(&ipt_ulog_logger); |
| 486 | xt_unregister_target(&ulog_tg_reg); |
| 487 | unregister_pernet_subsys(&ulog_tg_net_ops); |
| 488 | } |
| 489 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 490 | module_init(ulog_tg_init); |
| 491 | module_exit(ulog_tg_exit); |