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-rw-r--r--net/bridge/netfilter/Kconfig16
-rw-r--r--net/bridge/netfilter/ebt_ulog.c393
2 files changed, 0 insertions, 409 deletions
diff --git a/net/bridge/netfilter/Kconfig b/net/bridge/netfilter/Kconfig
index 629dc77874a9..3a76ac7b7141 100644
--- a/net/bridge/netfilter/Kconfig
+++ b/net/bridge/netfilter/Kconfig
@@ -202,22 +202,6 @@ config BRIDGE_EBT_LOG
202 202
203 To compile it as a module, choose M here. If unsure, say N. 203 To compile it as a module, choose M here. If unsure, say N.
204 204
205config BRIDGE_EBT_ULOG
206 tristate "ebt: ulog support (OBSOLETE)"
207 help
208 This option enables the old bridge-specific "ebt_ulog" implementation
209 which has been obsoleted by the new "nfnetlink_log" code (see
210 CONFIG_NETFILTER_NETLINK_LOG).
211
212 This option adds the ulog watcher, that you can use in any rule
213 in any ebtables table. The packet is passed to a userspace
214 logging daemon using netlink multicast sockets. This differs
215 from the log watcher in the sense that the complete packet is
216 sent to userspace instead of a descriptive text and that
217 netlink multicast sockets are used instead of the syslog.
218
219 To compile it as a module, choose M here. If unsure, say N.
220
221config BRIDGE_EBT_NFLOG 205config BRIDGE_EBT_NFLOG
222 tristate "ebt: nflog support" 206 tristate "ebt: nflog support"
223 help 207 help
diff --git a/net/bridge/netfilter/ebt_ulog.c b/net/bridge/netfilter/ebt_ulog.c
deleted file mode 100644
index 7c470c371e14..000000000000
--- a/net/bridge/netfilter/ebt_ulog.c
+++ /dev/null
@@ -1,393 +0,0 @@
1/*
2 * netfilter module for userspace bridged Ethernet frames logging daemons
3 *
4 * Authors:
5 * Bart De Schuymer <bdschuym@pandora.be>
6 * Harald Welte <laforge@netfilter.org>
7 *
8 * November, 2004
9 *
10 * Based on ipt_ULOG.c, which is
11 * (C) 2000-2002 by Harald Welte <laforge@netfilter.org>
12 *
13 * This module accepts two parameters:
14 *
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 */
30#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31#include <linux/module.h>
32#include <linux/slab.h>
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 <net/netlink.h>
39#include <linux/netdevice.h>
40#include <linux/netfilter/x_tables.h>
41#include <linux/netfilter_bridge/ebtables.h>
42#include <linux/netfilter_bridge/ebt_ulog.h>
43#include <net/netfilter/nf_log.h>
44#include <net/netns/generic.h>
45#include <net/sock.h>
46#include "../br_private.h"
47
48static unsigned int nlbufsiz = NLMSG_GOODSIZE;
49module_param(nlbufsiz, uint, 0600);
50MODULE_PARM_DESC(nlbufsiz, "netlink buffer size (number of bytes) "
51 "(defaults to 4096)");
52
53static unsigned int flushtimeout = 10;
54module_param(flushtimeout, uint, 0600);
55MODULE_PARM_DESC(flushtimeout, "buffer flush timeout (hundredths ofa second) "
56 "(defaults to 10)");
57
58typedef 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
66static int ebt_ulog_net_id __read_mostly;
67struct 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
73static struct ebt_ulog_net *ebt_ulog_pernet(struct net *net)
74{
75 return net_generic(net, ebt_ulog_net_id);
76}
77
78/* send one ulog_buff_t to userspace */
79static void ulog_send(struct ebt_ulog_net *ebt, unsigned int nlgroup)
80{
81 ebt_ulog_buff_t *ub = &ebt->ulog_buffers[nlgroup];
82
83 del_timer(&ub->timer);
84
85 if (!ub->skb)
86 return;
87
88 /* last nlmsg needs NLMSG_DONE */
89 if (ub->qlen > 1)
90 ub->lastnlh->nlmsg_type = NLMSG_DONE;
91
92 NETLINK_CB(ub->skb).dst_group = nlgroup + 1;
93 netlink_broadcast(ebt->ebtulognl, ub->skb, 0, nlgroup + 1, GFP_ATOMIC);
94
95 ub->qlen = 0;
96 ub->skb = NULL;
97}
98
99/* timer function to flush queue in flushtimeout time */
100static void ulog_timer(unsigned long data)
101{
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);
111}
112
113static struct sk_buff *ulog_alloc_skb(unsigned int size)
114{
115 struct sk_buff *skb;
116 unsigned int n;
117
118 n = max(size, nlbufsiz);
119 skb = alloc_skb(n, GFP_ATOMIC | __GFP_NOWARN);
120 if (!skb) {
121 if (n > size) {
122 /* try to allocate only as much as we need for
123 * current packet */
124 skb = alloc_skb(size, GFP_ATOMIC);
125 if (!skb)
126 pr_debug("cannot even allocate buffer of size %ub\n",
127 size);
128 }
129 }
130
131 return skb;
132}
133
134static 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)
140{
141 ebt_ulog_packet_msg_t *pm;
142 size_t size, copy_len;
143 struct nlmsghdr *nlh;
144 struct ebt_ulog_net *ebt = ebt_ulog_pernet(net);
145 unsigned int group = uloginfo->nlgroup;
146 ebt_ulog_buff_t *ub = &ebt->ulog_buffers[group];
147 spinlock_t *lock = &ub->lock;
148 ktime_t kt;
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
156 size = nlmsg_total_size(sizeof(*pm) + copy_len);
157 if (size > nlbufsiz) {
158 pr_debug("Size %Zd needed, but nlbufsiz=%d\n", size, nlbufsiz);
159 return;
160 }
161
162 spin_lock_bh(lock);
163
164 if (!ub->skb) {
165 if (!(ub->skb = ulog_alloc_skb(size)))
166 goto unlock;
167 } else if (size > skb_tailroom(ub->skb)) {
168 ulog_send(ebt, group);
169
170 if (!(ub->skb = ulog_alloc_skb(size)))
171 goto unlock;
172 }
173
174 nlh = nlmsg_put(ub->skb, 0, ub->qlen, 0,
175 size - NLMSG_ALIGN(sizeof(*nlh)), 0);
176 if (!nlh) {
177 kfree_skb(ub->skb);
178 ub->skb = NULL;
179 goto unlock;
180 }
181 ub->qlen++;
182
183 pm = nlmsg_data(nlh);
184 memset(pm, 0, sizeof(*pm));
185
186 /* Fill in the ulog data */
187 pm->version = EBT_ULOG_VERSION;
188 kt = ktime_get_real();
189 pm->stamp = ktime_to_timeval(kt);
190 if (ub->qlen == 1)
191 ub->skb->tstamp = kt;
192 pm->data_len = copy_len;
193 pm->mark = skb->mark;
194 pm->hook = hooknr;
195 if (uloginfo->prefix != NULL)
196 strcpy(pm->prefix, uloginfo->prefix);
197
198 if (in) {
199 strcpy(pm->physindev, in->name);
200 /* If in isn't a bridge, then physindev==indev */
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);
204 else
205 strcpy(pm->indev, in->name);
206 }
207
208 if (out) {
209 /* If out exists, then out is a bridge port */
210 strcpy(pm->physoutdev, out->name);
211 /* rcu_read_lock()ed by nf_hook_slow */
212 strcpy(pm->outdev, br_port_get_rcu(out)->br->dev->name);
213 }
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)
224 ulog_send(ebt, group);
225 else if (!timer_pending(&ub->timer)) {
226 ub->timer.expires = jiffies + flushtimeout * HZ / 100;
227 add_timer(&ub->timer);
228 }
229
230unlock:
231 spin_unlock_bh(lock);
232}
233
234/* this function is registered with the netfilter core */
235static void ebt_log_packet(struct net *net, u_int8_t pf, unsigned int hooknum,
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
254 ebt_ulog_packet(net, hooknum, skb, in, out, &loginfo, prefix);
255}
256
257static unsigned int
258ebt_ulog_tg(struct sk_buff *skb, const struct xt_action_param *par)
259{
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,
263 par->targinfo, NULL);
264 return EBT_CONTINUE;
265}
266
267static int ebt_ulog_tg_check(const struct xt_tgchk_param *par)
268{
269 struct ebt_ulog_info *uloginfo = par->targinfo;
270
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
277 if (uloginfo->nlgroup > 31)
278 return -EINVAL;
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
285 return 0;
286}
287
288static struct xt_target ebt_ulog_tg_reg __read_mostly = {
289 .name = "ulog",
290 .revision = 0,
291 .family = NFPROTO_BRIDGE,
292 .target = ebt_ulog_tg,
293 .checkentry = ebt_ulog_tg_check,
294 .targetsize = sizeof(struct ebt_ulog_info),
295 .me = THIS_MODULE,
296};
297
298static struct nf_logger ebt_ulog_logger __read_mostly = {
299 .name = "ebt_ulog",
300 .logfn = &ebt_log_packet,
301 .me = THIS_MODULE,
302};
303
304static int __net_init ebt_ulog_net_init(struct net *net)
305{
306 int i;
307 struct ebt_ulog_net *ebt = ebt_ulog_pernet(net);
308
309 struct netlink_kernel_cfg cfg = {
310 .groups = EBT_ULOG_MAXNLGROUPS,
311 };
312
313 /* initialize ulog_buffers */
314 for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) {
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);
319 }
320
321 ebt->ebtulognl = netlink_kernel_create(net, NETLINK_NFLOG, &cfg);
322 if (!ebt->ebtulognl)
323 return -ENOMEM;
324
325 nf_log_set(net, NFPROTO_BRIDGE, &ebt_ulog_logger);
326 return 0;
327}
328
329static void __net_exit ebt_ulog_net_fini(struct net *net)
330{
331 int i;
332 struct ebt_ulog_net *ebt = ebt_ulog_pernet(net);
333
334 nf_log_unset(net, &ebt_ulog_logger);
335 for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) {
336 ebt_ulog_buff_t *ub = &ebt->ulog_buffers[i];
337 del_timer(&ub->timer);
338
339 if (ub->skb) {
340 kfree_skb(ub->skb);
341 ub->skb = NULL;
342 }
343 }
344 netlink_kernel_release(ebt->ebtulognl);
345}
346
347static 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
354static 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
376out_target:
377 unregister_pernet_subsys(&ebt_ulog_net_ops);
378out_pernet:
379 return ret;
380}
381
382static 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);
387}
388
389module_init(ebt_ulog_init);
390module_exit(ebt_ulog_fini);
391MODULE_LICENSE("GPL");
392MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>");
393MODULE_DESCRIPTION("Ebtables: Packet logging to netlink using ULOG");
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-02 22:01:25 -0500