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14#include <linux/module.h>
15#include <linux/skbuff.h>
16#include <linux/init.h>
17#include <linux/ip.h>
18#include <linux/ipv6.h>
19#include <linux/netdevice.h>
20#include <linux/netfilter.h>
21#include <linux/netlink.h>
22#include <linux/netfilter/nfnetlink.h>
23#include <linux/netfilter/nfnetlink_log.h>
24#include <linux/spinlock.h>
25#include <linux/sysctl.h>
26#include <linux/proc_fs.h>
27#include <linux/security.h>
28#include <linux/list.h>
29#include <linux/jhash.h>
30#include <linux/random.h>
31#include <net/sock.h>
32#include <net/netfilter/nf_log.h>
33
34#include <asm/atomic.h>
35
36#ifdef CONFIG_BRIDGE_NETFILTER
37#include "../bridge/br_private.h"
38#endif
39
40#define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE
41#define NFULNL_TIMEOUT_DEFAULT HZ
42#define NFULNL_QTHRESH_DEFAULT 100
43#define NFULNL_COPY_RANGE_MAX 0xFFFF
44
45#define PRINTR(x, args...) do { if (net_ratelimit()) \
46 printk(x, ## args); } while (0);
47
48struct nfulnl_instance {
49 struct hlist_node hlist;
50 spinlock_t lock;
51 atomic_t use;
52
53 unsigned int qlen;
54 struct sk_buff *skb;
55 struct timer_list timer;
56 int peer_pid;
57
58
59 unsigned int flushtimeout;
60 unsigned int nlbufsiz;
61 unsigned int qthreshold;
62 u_int32_t copy_range;
63 u_int32_t seq;
64 u_int16_t group_num;
65 u_int16_t flags;
66 u_int8_t copy_mode;
67};
68
69static DEFINE_RWLOCK(instances_lock);
70static atomic_t global_seq;
71
72#define INSTANCE_BUCKETS 16
73static struct hlist_head instance_table[INSTANCE_BUCKETS];
74static unsigned int hash_init;
75
76static inline u_int8_t instance_hashfn(u_int16_t group_num)
77{
78 return ((group_num & 0xff) % INSTANCE_BUCKETS);
79}
80
81static struct nfulnl_instance *
82__instance_lookup(u_int16_t group_num)
83{
84 struct hlist_head *head;
85 struct hlist_node *pos;
86 struct nfulnl_instance *inst;
87
88 head = &instance_table[instance_hashfn(group_num)];
89 hlist_for_each_entry(inst, pos, head, hlist) {
90 if (inst->group_num == group_num)
91 return inst;
92 }
93 return NULL;
94}
95
96static inline void
97instance_get(struct nfulnl_instance *inst)
98{
99 atomic_inc(&inst->use);
100}
101
102static struct nfulnl_instance *
103instance_lookup_get(u_int16_t group_num)
104{
105 struct nfulnl_instance *inst;
106
107 read_lock_bh(&instances_lock);
108 inst = __instance_lookup(group_num);
109 if (inst)
110 instance_get(inst);
111 read_unlock_bh(&instances_lock);
112
113 return inst;
114}
115
116static void
117instance_put(struct nfulnl_instance *inst)
118{
119 if (inst && atomic_dec_and_test(&inst->use)) {
120 kfree(inst);
121 module_put(THIS_MODULE);
122 }
123}
124
125static void nfulnl_timer(unsigned long data);
126
127static struct nfulnl_instance *
128instance_create(u_int16_t group_num, int pid)
129{
130 struct nfulnl_instance *inst;
131 int err;
132
133 write_lock_bh(&instances_lock);
134 if (__instance_lookup(group_num)) {
135 err = -EEXIST;
136 goto out_unlock;
137 }
138
139 inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
140 if (!inst) {
141 err = -ENOMEM;
142 goto out_unlock;
143 }
144
145 if (!try_module_get(THIS_MODULE)) {
146 kfree(inst);
147 err = -EAGAIN;
148 goto out_unlock;
149 }
150
151 INIT_HLIST_NODE(&inst->hlist);
152 spin_lock_init(&inst->lock);
153
154 atomic_set(&inst->use, 2);
155
156 setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst);
157
158 inst->peer_pid = pid;
159 inst->group_num = group_num;
160
161 inst->qthreshold = NFULNL_QTHRESH_DEFAULT;
162 inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT;
163 inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT;
164 inst->copy_mode = NFULNL_COPY_PACKET;
165 inst->copy_range = NFULNL_COPY_RANGE_MAX;
166
167 hlist_add_head(&inst->hlist,
168 &instance_table[instance_hashfn(group_num)]);
169
170 write_unlock_bh(&instances_lock);
171
172 return inst;
173
174out_unlock:
175 write_unlock_bh(&instances_lock);
176 return ERR_PTR(err);
177}
178
179static void __nfulnl_flush(struct nfulnl_instance *inst);
180
181static void
182__instance_destroy(struct nfulnl_instance *inst)
183{
184
185 hlist_del(&inst->hlist);
186
187
188
189 spin_lock_bh(&inst->lock);
190 if (inst->skb)
191 __nfulnl_flush(inst);
192 spin_unlock_bh(&inst->lock);
193
194
195 instance_put(inst);
196}
197
198static inline void
199instance_destroy(struct nfulnl_instance *inst)
200{
201 write_lock_bh(&instances_lock);
202 __instance_destroy(inst);
203 write_unlock_bh(&instances_lock);
204}
205
206static int
207nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode,
208 unsigned int range)
209{
210 int status = 0;
211
212 spin_lock_bh(&inst->lock);
213
214 switch (mode) {
215 case NFULNL_COPY_NONE:
216 case NFULNL_COPY_META:
217 inst->copy_mode = mode;
218 inst->copy_range = 0;
219 break;
220
221 case NFULNL_COPY_PACKET:
222 inst->copy_mode = mode;
223 inst->copy_range = min_t(unsigned int,
224 range, NFULNL_COPY_RANGE_MAX);
225 break;
226
227 default:
228 status = -EINVAL;
229 break;
230 }
231
232 spin_unlock_bh(&inst->lock);
233
234 return status;
235}
236
237static int
238nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz)
239{
240 int status;
241
242 spin_lock_bh(&inst->lock);
243 if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT)
244 status = -ERANGE;
245 else if (nlbufsiz > 131072)
246 status = -ERANGE;
247 else {
248 inst->nlbufsiz = nlbufsiz;
249 status = 0;
250 }
251 spin_unlock_bh(&inst->lock);
252
253 return status;
254}
255
256static int
257nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout)
258{
259 spin_lock_bh(&inst->lock);
260 inst->flushtimeout = timeout;
261 spin_unlock_bh(&inst->lock);
262
263 return 0;
264}
265
266static int
267nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh)
268{
269 spin_lock_bh(&inst->lock);
270 inst->qthreshold = qthresh;
271 spin_unlock_bh(&inst->lock);
272
273 return 0;
274}
275
276static int
277nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags)
278{
279 spin_lock_bh(&inst->lock);
280 inst->flags = flags;
281 spin_unlock_bh(&inst->lock);
282
283 return 0;
284}
285
286static struct sk_buff *
287nfulnl_alloc_skb(unsigned int inst_size, unsigned int pkt_size)
288{
289 struct sk_buff *skb;
290 unsigned int n;
291
292
293
294
295 n = max(inst_size, pkt_size);
296 skb = alloc_skb(n, GFP_ATOMIC);
297 if (!skb) {
298 PRINTR("nfnetlink_log: can't alloc whole buffer (%u bytes)\n",
299 inst_size);
300
301 if (n > pkt_size) {
302
303
304
305 skb = alloc_skb(pkt_size, GFP_ATOMIC);
306 if (!skb)
307 PRINTR("nfnetlink_log: can't even alloc %u "
308 "bytes\n", pkt_size);
309 }
310 }
311
312 return skb;
313}
314
315static int
316__nfulnl_send(struct nfulnl_instance *inst)
317{
318 int status = -1;
319
320 if (inst->qlen > 1)
321 NLMSG_PUT(inst->skb, 0, 0,
322 NLMSG_DONE,
323 sizeof(struct nfgenmsg));
324
325 status = nfnetlink_unicast(inst->skb, inst->peer_pid, MSG_DONTWAIT);
326
327 inst->qlen = 0;
328 inst->skb = NULL;
329
330nlmsg_failure:
331 return status;
332}
333
334static void
335__nfulnl_flush(struct nfulnl_instance *inst)
336{
337
338 if (del_timer(&inst->timer))
339 instance_put(inst);
340 if (inst->skb)
341 __nfulnl_send(inst);
342}
343
344static void
345nfulnl_timer(unsigned long data)
346{
347 struct nfulnl_instance *inst = (struct nfulnl_instance *)data;
348
349 spin_lock_bh(&inst->lock);
350 if (inst->skb)
351 __nfulnl_send(inst);
352 spin_unlock_bh(&inst->lock);
353 instance_put(inst);
354}
355
356
357
358static inline int
359__build_packet_message(struct nfulnl_instance *inst,
360 const struct sk_buff *skb,
361 unsigned int data_len,
362 u_int8_t pf,
363 unsigned int hooknum,
364 const struct net_device *indev,
365 const struct net_device *outdev,
366 const struct nf_loginfo *li,
367 const char *prefix, unsigned int plen)
368{
369 struct nfulnl_msg_packet_hdr pmsg;
370 struct nlmsghdr *nlh;
371 struct nfgenmsg *nfmsg;
372 __be32 tmp_uint;
373 sk_buff_data_t old_tail = inst->skb->tail;
374
375 nlh = NLMSG_PUT(inst->skb, 0, 0,
376 NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET,
377 sizeof(struct nfgenmsg));
378 nfmsg = NLMSG_DATA(nlh);
379 nfmsg->nfgen_family = pf;
380 nfmsg->version = NFNETLINK_V0;
381 nfmsg->res_id = htons(inst->group_num);
382
383 pmsg.hw_protocol = skb->protocol;
384 pmsg.hook = hooknum;
385
386 NLA_PUT(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg);
387
388 if (prefix)
389 NLA_PUT(inst->skb, NFULA_PREFIX, plen, prefix);
390
391 if (indev) {
392#ifndef CONFIG_BRIDGE_NETFILTER
393 NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV,
394 htonl(indev->ifindex));
395#else
396 if (pf == PF_BRIDGE) {
397
398
399
400 NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSINDEV,
401 htonl(indev->ifindex));
402
403 NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV,
404 htonl(indev->br_port->br->dev->ifindex));
405 } else {
406
407
408 NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV,
409 htonl(indev->ifindex));
410 if (skb->nf_bridge && skb->nf_bridge->physindev)
411 NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSINDEV,
412 htonl(skb->nf_bridge->physindev->ifindex));
413 }
414#endif
415 }
416
417 if (outdev) {
418 tmp_uint = htonl(outdev->ifindex);
419#ifndef CONFIG_BRIDGE_NETFILTER
420 NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV,
421 htonl(outdev->ifindex));
422#else
423 if (pf == PF_BRIDGE) {
424
425
426
427 NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
428 htonl(outdev->ifindex));
429
430 NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV,
431 htonl(outdev->br_port->br->dev->ifindex));
432 } else {
433
434
435 NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV,
436 htonl(outdev->ifindex));
437 if (skb->nf_bridge && skb->nf_bridge->physoutdev)
438 NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
439 htonl(skb->nf_bridge->physoutdev->ifindex));
440 }
441#endif
442 }
443
444 if (skb->mark)
445 NLA_PUT_BE32(inst->skb, NFULA_MARK, htonl(skb->mark));
446
447 if (indev && skb->dev) {
448 struct nfulnl_msg_packet_hw phw;
449 int len = dev_parse_header(skb, phw.hw_addr);
450 if (len > 0) {
451 phw.hw_addrlen = htons(len);
452 NLA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw);
453 }
454 }
455
456 if (indev && skb_mac_header_was_set(skb)) {
457 NLA_PUT_BE16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type));
458 NLA_PUT_BE16(inst->skb, NFULA_HWLEN,
459 htons(skb->dev->hard_header_len));
460 NLA_PUT(inst->skb, NFULA_HWHEADER, skb->dev->hard_header_len,
461 skb_mac_header(skb));
462 }
463
464 if (skb->tstamp.tv64) {
465 struct nfulnl_msg_packet_timestamp ts;
466 struct timeval tv = ktime_to_timeval(skb->tstamp);
467 ts.sec = cpu_to_be64(tv.tv_sec);
468 ts.usec = cpu_to_be64(tv.tv_usec);
469
470 NLA_PUT(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts);
471 }
472
473
474 if (skb->sk) {
475 read_lock_bh(&skb->sk->sk_callback_lock);
476 if (skb->sk->sk_socket && skb->sk->sk_socket->file) {
477 __be32 uid = htonl(skb->sk->sk_socket->file->f_uid);
478 __be32 gid = htonl(skb->sk->sk_socket->file->f_gid);
479
480 read_unlock_bh(&skb->sk->sk_callback_lock);
481 NLA_PUT_BE32(inst->skb, NFULA_UID, uid);
482 NLA_PUT_BE32(inst->skb, NFULA_GID, gid);
483 } else
484 read_unlock_bh(&skb->sk->sk_callback_lock);
485 }
486
487
488 if (inst->flags & NFULNL_CFG_F_SEQ)
489 NLA_PUT_BE32(inst->skb, NFULA_SEQ, htonl(inst->seq++));
490
491
492 if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL)
493 NLA_PUT_BE32(inst->skb, NFULA_SEQ_GLOBAL,
494 htonl(atomic_inc_return(&global_seq)));
495
496 if (data_len) {
497 struct nlattr *nla;
498 int size = nla_attr_size(data_len);
499
500 if (skb_tailroom(inst->skb) < nla_total_size(data_len)) {
501 printk(KERN_WARNING "nfnetlink_log: no tailroom!\n");
502 goto nlmsg_failure;
503 }
504
505 nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len));
506 nla->nla_type = NFULA_PAYLOAD;
507 nla->nla_len = size;
508
509 if (skb_copy_bits(skb, 0, nla_data(nla), data_len))
510 BUG();
511 }
512
513 nlh->nlmsg_len = inst->skb->tail - old_tail;
514 return 0;
515
516nlmsg_failure:
517nla_put_failure:
518 PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n");
519 return -1;
520}
521
522#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
523
524static struct nf_loginfo default_loginfo = {
525 .type = NF_LOG_TYPE_ULOG,
526 .u = {
527 .ulog = {
528 .copy_len = 0xffff,
529 .group = 0,
530 .qthreshold = 1,
531 },
532 },
533};
534
535
536static void
537nfulnl_log_packet(u_int8_t pf,
538 unsigned int hooknum,
539 const struct sk_buff *skb,
540 const struct net_device *in,
541 const struct net_device *out,
542 const struct nf_loginfo *li_user,
543 const char *prefix)
544{
545 unsigned int size, data_len;
546 struct nfulnl_instance *inst;
547 const struct nf_loginfo *li;
548 unsigned int qthreshold;
549 unsigned int plen;
550
551 if (li_user && li_user->type == NF_LOG_TYPE_ULOG)
552 li = li_user;
553 else
554 li = &default_loginfo;
555
556 inst = instance_lookup_get(li->u.ulog.group);
557 if (!inst)
558 return;
559
560 plen = 0;
561 if (prefix)
562 plen = strlen(prefix) + 1;
563
564
565
566
567 size = NLMSG_SPACE(sizeof(struct nfgenmsg))
568 + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr))
569 + nla_total_size(sizeof(u_int32_t))
570 + nla_total_size(sizeof(u_int32_t))
571#ifdef CONFIG_BRIDGE_NETFILTER
572 + nla_total_size(sizeof(u_int32_t))
573 + nla_total_size(sizeof(u_int32_t))
574#endif
575 + nla_total_size(sizeof(u_int32_t))
576 + nla_total_size(sizeof(u_int32_t))
577 + nla_total_size(sizeof(u_int32_t))
578 + nla_total_size(plen)
579 + nla_total_size(sizeof(struct nfulnl_msg_packet_hw))
580 + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp));
581
582 spin_lock_bh(&inst->lock);
583
584 if (inst->flags & NFULNL_CFG_F_SEQ)
585 size += nla_total_size(sizeof(u_int32_t));
586 if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL)
587 size += nla_total_size(sizeof(u_int32_t));
588
589 qthreshold = inst->qthreshold;
590
591 if (qthreshold > li->u.ulog.qthreshold)
592 qthreshold = li->u.ulog.qthreshold;
593
594 switch (inst->copy_mode) {
595 case NFULNL_COPY_META:
596 case NFULNL_COPY_NONE:
597 data_len = 0;
598 break;
599
600 case NFULNL_COPY_PACKET:
601 if (inst->copy_range == 0
602 || inst->copy_range > skb->len)
603 data_len = skb->len;
604 else
605 data_len = inst->copy_range;
606
607 size += nla_total_size(data_len);
608 break;
609
610 default:
611 goto unlock_and_release;
612 }
613
614 if (inst->skb &&
615 size > skb_tailroom(inst->skb) - sizeof(struct nfgenmsg)) {
616
617
618 __nfulnl_flush(inst);
619 }
620
621 if (!inst->skb) {
622 inst->skb = nfulnl_alloc_skb(inst->nlbufsiz, size);
623 if (!inst->skb)
624 goto alloc_failure;
625 }
626
627 inst->qlen++;
628
629 __build_packet_message(inst, skb, data_len, pf,
630 hooknum, in, out, li, prefix, plen);
631
632 if (inst->qlen >= qthreshold)
633 __nfulnl_flush(inst);
634
635
636 else if (!timer_pending(&inst->timer)) {
637 instance_get(inst);
638 inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100);
639 add_timer(&inst->timer);
640 }
641
642unlock_and_release:
643 spin_unlock_bh(&inst->lock);
644 instance_put(inst);
645 return;
646
647alloc_failure:
648
649 goto unlock_and_release;
650}
651
652static int
653nfulnl_rcv_nl_event(struct notifier_block *this,
654 unsigned long event, void *ptr)
655{
656 struct netlink_notify *n = ptr;
657
658 if (event == NETLINK_URELEASE &&
659 n->protocol == NETLINK_NETFILTER && n->pid) {
660 int i;
661
662
663 write_lock_bh(&instances_lock);
664 for (i = 0; i < INSTANCE_BUCKETS; i++) {
665 struct hlist_node *tmp, *t2;
666 struct nfulnl_instance *inst;
667 struct hlist_head *head = &instance_table[i];
668
669 hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) {
670 if ((n->net == &init_net) &&
671 (n->pid == inst->peer_pid))
672 __instance_destroy(inst);
673 }
674 }
675 write_unlock_bh(&instances_lock);
676 }
677 return NOTIFY_DONE;
678}
679
680static struct notifier_block nfulnl_rtnl_notifier = {
681 .notifier_call = nfulnl_rcv_nl_event,
682};
683
684static int
685nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
686 struct nlmsghdr *nlh, struct nlattr *nfqa[])
687{
688 return -ENOTSUPP;
689}
690
691static const struct nf_logger nfulnl_logger = {
692 .name = "nfnetlink_log",
693 .logfn = &nfulnl_log_packet,
694 .me = THIS_MODULE,
695};
696
697static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = {
698 [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) },
699 [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) },
700 [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 },
701 [NFULA_CFG_QTHRESH] = { .type = NLA_U32 },
702 [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 },
703 [NFULA_CFG_FLAGS] = { .type = NLA_U16 },
704};
705
706static int
707nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
708 struct nlmsghdr *nlh, struct nlattr *nfula[])
709{
710 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
711 u_int16_t group_num = ntohs(nfmsg->res_id);
712 struct nfulnl_instance *inst;
713 struct nfulnl_msg_config_cmd *cmd = NULL;
714 int ret = 0;
715
716 if (nfula[NFULA_CFG_CMD]) {
717 u_int8_t pf = nfmsg->nfgen_family;
718 cmd = nla_data(nfula[NFULA_CFG_CMD]);
719
720
721 switch (cmd->command) {
722 case NFULNL_CFG_CMD_PF_BIND:
723 return nf_log_register(pf, &nfulnl_logger);
724 case NFULNL_CFG_CMD_PF_UNBIND:
725 nf_log_unregister_pf(pf);
726 return 0;
727 }
728 }
729
730 inst = instance_lookup_get(group_num);
731 if (inst && inst->peer_pid != NETLINK_CB(skb).pid) {
732 ret = -EPERM;
733 goto out_put;
734 }
735
736 if (cmd != NULL) {
737 switch (cmd->command) {
738 case NFULNL_CFG_CMD_BIND:
739 if (inst) {
740 ret = -EBUSY;
741 goto out_put;
742 }
743
744 inst = instance_create(group_num,
745 NETLINK_CB(skb).pid);
746 if (IS_ERR(inst)) {
747 ret = PTR_ERR(inst);
748 goto out;
749 }
750 break;
751 case NFULNL_CFG_CMD_UNBIND:
752 if (!inst) {
753 ret = -ENODEV;
754 goto out;
755 }
756
757 instance_destroy(inst);
758 goto out;
759 default:
760 ret = -ENOTSUPP;
761 break;
762 }
763 }
764
765 if (nfula[NFULA_CFG_MODE]) {
766 struct nfulnl_msg_config_mode *params;
767 params = nla_data(nfula[NFULA_CFG_MODE]);
768
769 if (!inst) {
770 ret = -ENODEV;
771 goto out;
772 }
773 nfulnl_set_mode(inst, params->copy_mode,
774 ntohl(params->copy_range));
775 }
776
777 if (nfula[NFULA_CFG_TIMEOUT]) {
778 __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]);
779
780 if (!inst) {
781 ret = -ENODEV;
782 goto out;
783 }
784 nfulnl_set_timeout(inst, ntohl(timeout));
785 }
786
787 if (nfula[NFULA_CFG_NLBUFSIZ]) {
788 __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]);
789
790 if (!inst) {
791 ret = -ENODEV;
792 goto out;
793 }
794 nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz));
795 }
796
797 if (nfula[NFULA_CFG_QTHRESH]) {
798 __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]);
799
800 if (!inst) {
801 ret = -ENODEV;
802 goto out;
803 }
804 nfulnl_set_qthresh(inst, ntohl(qthresh));
805 }
806
807 if (nfula[NFULA_CFG_FLAGS]) {
808 __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]);
809
810 if (!inst) {
811 ret = -ENODEV;
812 goto out;
813 }
814 nfulnl_set_flags(inst, ntohs(flags));
815 }
816
817out_put:
818 instance_put(inst);
819out:
820 return ret;
821}
822
823static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = {
824 [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp,
825 .attr_count = NFULA_MAX, },
826 [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config,
827 .attr_count = NFULA_CFG_MAX,
828 .policy = nfula_cfg_policy },
829};
830
831static const struct nfnetlink_subsystem nfulnl_subsys = {
832 .name = "log",
833 .subsys_id = NFNL_SUBSYS_ULOG,
834 .cb_count = NFULNL_MSG_MAX,
835 .cb = nfulnl_cb,
836};
837
838#ifdef CONFIG_PROC_FS
839struct iter_state {
840 unsigned int bucket;
841};
842
843static struct hlist_node *get_first(struct iter_state *st)
844{
845 if (!st)
846 return NULL;
847
848 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
849 if (!hlist_empty(&instance_table[st->bucket]))
850 return instance_table[st->bucket].first;
851 }
852 return NULL;
853}
854
855static struct hlist_node *get_next(struct iter_state *st, struct hlist_node *h)
856{
857 h = h->next;
858 while (!h) {
859 if (++st->bucket >= INSTANCE_BUCKETS)
860 return NULL;
861
862 h = instance_table[st->bucket].first;
863 }
864 return h;
865}
866
867static struct hlist_node *get_idx(struct iter_state *st, loff_t pos)
868{
869 struct hlist_node *head;
870 head = get_first(st);
871
872 if (head)
873 while (pos && (head = get_next(st, head)))
874 pos--;
875 return pos ? NULL : head;
876}
877
878static void *seq_start(struct seq_file *seq, loff_t *pos)
879 __acquires(instances_lock)
880{
881 read_lock_bh(&instances_lock);
882 return get_idx(seq->private, *pos);
883}
884
885static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
886{
887 (*pos)++;
888 return get_next(s->private, v);
889}
890
891static void seq_stop(struct seq_file *s, void *v)
892 __releases(instances_lock)
893{
894 read_unlock_bh(&instances_lock);
895}
896
897static int seq_show(struct seq_file *s, void *v)
898{
899 const struct nfulnl_instance *inst = v;
900
901 return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n",
902 inst->group_num,
903 inst->peer_pid, inst->qlen,
904 inst->copy_mode, inst->copy_range,
905 inst->flushtimeout, atomic_read(&inst->use));
906}
907
908static const struct seq_operations nful_seq_ops = {
909 .start = seq_start,
910 .next = seq_next,
911 .stop = seq_stop,
912 .show = seq_show,
913};
914
915static int nful_open(struct inode *inode, struct file *file)
916{
917 return seq_open_private(file, &nful_seq_ops,
918 sizeof(struct iter_state));
919}
920
921static const struct file_operations nful_file_ops = {
922 .owner = THIS_MODULE,
923 .open = nful_open,
924 .read = seq_read,
925 .llseek = seq_lseek,
926 .release = seq_release_private,
927};
928
929#endif
930
931static int __init nfnetlink_log_init(void)
932{
933 int i, status = -ENOMEM;
934
935 for (i = 0; i < INSTANCE_BUCKETS; i++)
936 INIT_HLIST_HEAD(&instance_table[i]);
937
938
939
940
941 get_random_bytes(&hash_init, sizeof(hash_init));
942
943 netlink_register_notifier(&nfulnl_rtnl_notifier);
944 status = nfnetlink_subsys_register(&nfulnl_subsys);
945 if (status < 0) {
946 printk(KERN_ERR "log: failed to create netlink socket\n");
947 goto cleanup_netlink_notifier;
948 }
949
950#ifdef CONFIG_PROC_FS
951 if (!proc_create("nfnetlink_log", 0440,
952 proc_net_netfilter, &nful_file_ops))
953 goto cleanup_subsys;
954#endif
955 return status;
956
957#ifdef CONFIG_PROC_FS
958cleanup_subsys:
959 nfnetlink_subsys_unregister(&nfulnl_subsys);
960#endif
961cleanup_netlink_notifier:
962 netlink_unregister_notifier(&nfulnl_rtnl_notifier);
963 return status;
964}
965
966static void __exit nfnetlink_log_fini(void)
967{
968 nf_log_unregister(&nfulnl_logger);
969#ifdef CONFIG_PROC_FS
970 remove_proc_entry("nfnetlink_log", proc_net_netfilter);
971#endif
972 nfnetlink_subsys_unregister(&nfulnl_subsys);
973 netlink_unregister_notifier(&nfulnl_rtnl_notifier);
974}
975
976MODULE_DESCRIPTION("netfilter userspace logging");
977MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
978MODULE_LICENSE("GPL");
979MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG);
980
981module_init(nfnetlink_log_init);
982module_exit(nfnetlink_log_fini);