2 * Kernel iptables module to track stats for packets based on user tags.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
12 * There are run-time debug flags enabled via the debug_mask module param, or
13 * via the DEFAULT_DEBUG_MASK. See xt_qtaguid_internal.h.
17 #include <linux/file.h>
18 #include <linux/inetdevice.h>
19 #include <linux/module.h>
20 #include <linux/netfilter/x_tables.h>
21 #include <linux/netfilter/xt_qtaguid.h>
22 #include <linux/ratelimit.h>
23 #include <linux/seq_file.h>
24 #include <linux/skbuff.h>
25 #include <linux/workqueue.h>
26 #include <net/addrconf.h>
31 #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE)
32 #include <linux/netfilter_ipv6/ip6_tables.h>
35 #include <linux/netfilter/xt_socket.h>
36 #include "xt_qtaguid_internal.h"
37 #include "xt_qtaguid_print.h"
38 #include "../../fs/proc/internal.h"
41 * We only use the xt_socket funcs within a similar context to avoid unexpected
44 #define XT_SOCKET_SUPPORTED_HOOKS \
45 ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_IN))
48 static const char *module_procdirname = "xt_qtaguid";
49 static struct proc_dir_entry *xt_qtaguid_procdir;
51 static unsigned int proc_iface_perms = S_IRUGO;
52 module_param_named(iface_perms, proc_iface_perms, uint, S_IRUGO | S_IWUSR);
54 static struct proc_dir_entry *xt_qtaguid_stats_file;
55 static unsigned int proc_stats_perms = S_IRUGO;
56 module_param_named(stats_perms, proc_stats_perms, uint, S_IRUGO | S_IWUSR);
58 static struct proc_dir_entry *xt_qtaguid_ctrl_file;
60 /* Everybody can write. But proc_ctrl_write_limited is true by default which
61 * limits what can be controlled. See the can_*() functions.
63 static unsigned int proc_ctrl_perms = S_IRUGO | S_IWUGO;
64 module_param_named(ctrl_perms, proc_ctrl_perms, uint, S_IRUGO | S_IWUSR);
66 /* Limited by default, so the gid of the ctrl and stats proc entries
67 * will limit what can be done. See the can_*() functions.
69 static bool proc_stats_readall_limited = true;
70 static bool proc_ctrl_write_limited = true;
72 module_param_named(stats_readall_limited, proc_stats_readall_limited, bool,
74 module_param_named(ctrl_write_limited, proc_ctrl_write_limited, bool,
78 * Limit the number of active tags (via socket tags) for a given UID.
79 * Multiple processes could share the UID.
81 static int max_sock_tags = DEFAULT_MAX_SOCK_TAGS;
82 module_param(max_sock_tags, int, S_IRUGO | S_IWUSR);
85 * After the kernel has initiallized this module, it is still possible
87 * Setting passive to Y:
88 * - the iface stats handling will not act on notifications.
89 * - iptables matches will never match.
90 * - ctrl commands silently succeed.
91 * - stats are always empty.
92 * This is mostly usefull when a bug is suspected.
94 static bool module_passive;
95 module_param_named(passive, module_passive, bool, S_IRUGO | S_IWUSR);
98 * Control how qtaguid data is tracked per proc/uid.
99 * Setting tag_tracking_passive to Y:
100 * - don't create proc specific structs to track tags
101 * - don't check that active tag stats exceed some limits.
102 * - don't clean up socket tags on process exits.
103 * This is mostly usefull when a bug is suspected.
105 static bool qtu_proc_handling_passive;
106 module_param_named(tag_tracking_passive, qtu_proc_handling_passive, bool,
109 #define QTU_DEV_NAME "xt_qtaguid"
111 uint qtaguid_debug_mask = DEFAULT_DEBUG_MASK;
112 module_param_named(debug_mask, qtaguid_debug_mask, uint, S_IRUGO | S_IWUSR);
114 /*---------------------------------------------------------------------------*/
115 static const char *iface_stat_procdirname = "iface_stat";
116 static struct proc_dir_entry *iface_stat_procdir;
118 * The iface_stat_all* will go away once userspace gets use to the new fields
119 * that have a format line.
121 static const char *iface_stat_all_procfilename = "iface_stat_all";
122 static struct proc_dir_entry *iface_stat_all_procfile;
123 static const char *iface_stat_fmt_procfilename = "iface_stat_fmt";
124 static struct proc_dir_entry *iface_stat_fmt_procfile;
127 static LIST_HEAD(iface_stat_list);
128 static DEFINE_SPINLOCK(iface_stat_list_lock);
130 static struct rb_root sock_tag_tree = RB_ROOT;
131 static DEFINE_SPINLOCK(sock_tag_list_lock);
133 static struct rb_root tag_counter_set_tree = RB_ROOT;
134 static DEFINE_SPINLOCK(tag_counter_set_list_lock);
136 static struct rb_root uid_tag_data_tree = RB_ROOT;
137 static DEFINE_SPINLOCK(uid_tag_data_tree_lock);
139 static struct rb_root proc_qtu_data_tree = RB_ROOT;
140 /* No proc_qtu_data_tree_lock; use uid_tag_data_tree_lock */
142 static struct qtaguid_event_counts qtu_events;
143 /*----------------------------------------------*/
144 static bool can_manipulate_uids(void)
147 return in_egroup_p(xt_qtaguid_ctrl_file->gid)
148 || unlikely(!current_fsuid()) || unlikely(!proc_ctrl_write_limited)
149 || unlikely(current_fsuid() == xt_qtaguid_ctrl_file->uid);
152 static bool can_impersonate_uid(uid_t uid)
154 return uid == current_fsuid() || can_manipulate_uids();
157 static bool can_read_other_uid_stats(uid_t uid)
160 return in_egroup_p(xt_qtaguid_stats_file->gid)
161 || unlikely(!current_fsuid()) || uid == current_fsuid()
162 || unlikely(!proc_stats_readall_limited)
163 || unlikely(current_fsuid() == xt_qtaguid_ctrl_file->uid);
166 static inline void dc_add_byte_packets(struct data_counters *counters, int set,
167 enum ifs_tx_rx direction,
168 enum ifs_proto ifs_proto,
172 counters->bpc[set][direction][ifs_proto].bytes += bytes;
173 counters->bpc[set][direction][ifs_proto].packets += packets;
176 static struct tag_node *tag_node_tree_search(struct rb_root *root, tag_t tag)
178 struct rb_node *node = root->rb_node;
181 struct tag_node *data = rb_entry(node, struct tag_node, node);
183 RB_DEBUG("qtaguid: tag_node_tree_search(0x%llx): "
184 " node=%p data=%p\n", tag, node, data);
185 result = tag_compare(tag, data->tag);
186 RB_DEBUG("qtaguid: tag_node_tree_search(0x%llx): "
187 " data.tag=0x%llx (uid=%u) res=%d\n",
188 tag, data->tag, get_uid_from_tag(data->tag), result);
190 node = node->rb_left;
192 node = node->rb_right;
199 static void tag_node_tree_insert(struct tag_node *data, struct rb_root *root)
201 struct rb_node **new = &(root->rb_node), *parent = NULL;
203 /* Figure out where to put new node */
205 struct tag_node *this = rb_entry(*new, struct tag_node,
207 int result = tag_compare(data->tag, this->tag);
208 RB_DEBUG("qtaguid: %s(): tag=0x%llx"
209 " (uid=%u)\n", __func__,
211 get_uid_from_tag(this->tag));
214 new = &((*new)->rb_left);
216 new = &((*new)->rb_right);
221 /* Add new node and rebalance tree. */
222 rb_link_node(&data->node, parent, new);
223 rb_insert_color(&data->node, root);
226 static void tag_stat_tree_insert(struct tag_stat *data, struct rb_root *root)
228 tag_node_tree_insert(&data->tn, root);
231 static struct tag_stat *tag_stat_tree_search(struct rb_root *root, tag_t tag)
233 struct tag_node *node = tag_node_tree_search(root, tag);
236 return rb_entry(&node->node, struct tag_stat, tn.node);
239 static void tag_counter_set_tree_insert(struct tag_counter_set *data,
240 struct rb_root *root)
242 tag_node_tree_insert(&data->tn, root);
245 static struct tag_counter_set *tag_counter_set_tree_search(struct rb_root *root,
248 struct tag_node *node = tag_node_tree_search(root, tag);
251 return rb_entry(&node->node, struct tag_counter_set, tn.node);
255 static void tag_ref_tree_insert(struct tag_ref *data, struct rb_root *root)
257 tag_node_tree_insert(&data->tn, root);
260 static struct tag_ref *tag_ref_tree_search(struct rb_root *root, tag_t tag)
262 struct tag_node *node = tag_node_tree_search(root, tag);
265 return rb_entry(&node->node, struct tag_ref, tn.node);
268 static struct sock_tag *sock_tag_tree_search(struct rb_root *root,
269 const struct sock *sk)
271 struct rb_node *node = root->rb_node;
274 struct sock_tag *data = rb_entry(node, struct sock_tag,
277 node = node->rb_left;
278 else if (sk > data->sk)
279 node = node->rb_right;
286 static void sock_tag_tree_insert(struct sock_tag *data, struct rb_root *root)
288 struct rb_node **new = &(root->rb_node), *parent = NULL;
290 /* Figure out where to put new node */
292 struct sock_tag *this = rb_entry(*new, struct sock_tag,
295 if (data->sk < this->sk)
296 new = &((*new)->rb_left);
297 else if (data->sk > this->sk)
298 new = &((*new)->rb_right);
303 /* Add new node and rebalance tree. */
304 rb_link_node(&data->sock_node, parent, new);
305 rb_insert_color(&data->sock_node, root);
308 static void sock_tag_tree_erase(struct rb_root *st_to_free_tree)
310 struct rb_node *node;
311 struct sock_tag *st_entry;
313 node = rb_first(st_to_free_tree);
315 st_entry = rb_entry(node, struct sock_tag, sock_node);
316 node = rb_next(node);
317 CT_DEBUG("qtaguid: %s(): "
318 "erase st: sk=%p tag=0x%llx (uid=%u)\n", __func__,
321 get_uid_from_tag(st_entry->tag));
322 rb_erase(&st_entry->sock_node, st_to_free_tree);
323 sockfd_put(st_entry->socket);
328 static struct proc_qtu_data *proc_qtu_data_tree_search(struct rb_root *root,
331 struct rb_node *node = root->rb_node;
334 struct proc_qtu_data *data = rb_entry(node,
335 struct proc_qtu_data,
338 node = node->rb_left;
339 else if (pid > data->pid)
340 node = node->rb_right;
347 static void proc_qtu_data_tree_insert(struct proc_qtu_data *data,
348 struct rb_root *root)
350 struct rb_node **new = &(root->rb_node), *parent = NULL;
352 /* Figure out where to put new node */
354 struct proc_qtu_data *this = rb_entry(*new,
355 struct proc_qtu_data,
358 if (data->pid < this->pid)
359 new = &((*new)->rb_left);
360 else if (data->pid > this->pid)
361 new = &((*new)->rb_right);
366 /* Add new node and rebalance tree. */
367 rb_link_node(&data->node, parent, new);
368 rb_insert_color(&data->node, root);
371 static void uid_tag_data_tree_insert(struct uid_tag_data *data,
372 struct rb_root *root)
374 struct rb_node **new = &(root->rb_node), *parent = NULL;
376 /* Figure out where to put new node */
378 struct uid_tag_data *this = rb_entry(*new,
382 if (data->uid < this->uid)
383 new = &((*new)->rb_left);
384 else if (data->uid > this->uid)
385 new = &((*new)->rb_right);
390 /* Add new node and rebalance tree. */
391 rb_link_node(&data->node, parent, new);
392 rb_insert_color(&data->node, root);
395 static struct uid_tag_data *uid_tag_data_tree_search(struct rb_root *root,
398 struct rb_node *node = root->rb_node;
401 struct uid_tag_data *data = rb_entry(node,
405 node = node->rb_left;
406 else if (uid > data->uid)
407 node = node->rb_right;
415 * Allocates a new uid_tag_data struct if needed.
416 * Returns a pointer to the found or allocated uid_tag_data.
417 * Returns a PTR_ERR on failures, and lock is not held.
418 * If found is not NULL:
419 * sets *found to true if not allocated.
420 * sets *found to false if allocated.
422 struct uid_tag_data *get_uid_data(uid_t uid, bool *found_res)
424 struct uid_tag_data *utd_entry;
426 /* Look for top level uid_tag_data for the UID */
427 utd_entry = uid_tag_data_tree_search(&uid_tag_data_tree, uid);
428 DR_DEBUG("qtaguid: get_uid_data(%u) utd=%p\n", uid, utd_entry);
431 *found_res = utd_entry;
435 utd_entry = kzalloc(sizeof(*utd_entry), GFP_ATOMIC);
437 pr_err("qtaguid: get_uid_data(%u): "
438 "tag data alloc failed\n", uid);
439 return ERR_PTR(-ENOMEM);
442 utd_entry->uid = uid;
443 utd_entry->tag_ref_tree = RB_ROOT;
444 uid_tag_data_tree_insert(utd_entry, &uid_tag_data_tree);
445 DR_DEBUG("qtaguid: get_uid_data(%u) new utd=%p\n", uid, utd_entry);
449 /* Never returns NULL. Either PTR_ERR or a valid ptr. */
450 static struct tag_ref *new_tag_ref(tag_t new_tag,
451 struct uid_tag_data *utd_entry)
453 struct tag_ref *tr_entry;
456 if (utd_entry->num_active_tags + 1 > max_sock_tags) {
457 pr_info("qtaguid: new_tag_ref(0x%llx): "
458 "tag ref alloc quota exceeded. max=%d\n",
459 new_tag, max_sock_tags);
465 tr_entry = kzalloc(sizeof(*tr_entry), GFP_ATOMIC);
467 pr_err("qtaguid: new_tag_ref(0x%llx): "
468 "tag ref alloc failed\n",
473 tr_entry->tn.tag = new_tag;
474 /* tr_entry->num_sock_tags handled by caller */
475 utd_entry->num_active_tags++;
476 tag_ref_tree_insert(tr_entry, &utd_entry->tag_ref_tree);
477 DR_DEBUG("qtaguid: new_tag_ref(0x%llx): "
478 " inserted new tag ref %p\n",
486 static struct tag_ref *lookup_tag_ref(tag_t full_tag,
487 struct uid_tag_data **utd_res)
489 struct uid_tag_data *utd_entry;
490 struct tag_ref *tr_entry;
492 uid_t uid = get_uid_from_tag(full_tag);
494 DR_DEBUG("qtaguid: lookup_tag_ref(tag=0x%llx (uid=%u))\n",
497 utd_entry = get_uid_data(uid, &found_utd);
498 if (IS_ERR_OR_NULL(utd_entry)) {
500 *utd_res = utd_entry;
504 tr_entry = tag_ref_tree_search(&utd_entry->tag_ref_tree, full_tag);
506 *utd_res = utd_entry;
507 DR_DEBUG("qtaguid: lookup_tag_ref(0x%llx) utd_entry=%p tr_entry=%p\n",
508 full_tag, utd_entry, tr_entry);
512 /* Never returns NULL. Either PTR_ERR or a valid ptr. */
513 static struct tag_ref *get_tag_ref(tag_t full_tag,
514 struct uid_tag_data **utd_res)
516 struct uid_tag_data *utd_entry;
517 struct tag_ref *tr_entry;
519 DR_DEBUG("qtaguid: get_tag_ref(0x%llx)\n",
521 spin_lock_bh(&uid_tag_data_tree_lock);
522 tr_entry = lookup_tag_ref(full_tag, &utd_entry);
523 BUG_ON(IS_ERR_OR_NULL(utd_entry));
525 tr_entry = new_tag_ref(full_tag, utd_entry);
527 spin_unlock_bh(&uid_tag_data_tree_lock);
529 *utd_res = utd_entry;
530 DR_DEBUG("qtaguid: get_tag_ref(0x%llx) utd=%p tr=%p\n",
531 full_tag, utd_entry, tr_entry);
535 /* Checks and maybe frees the UID Tag Data entry */
536 static void put_utd_entry(struct uid_tag_data *utd_entry)
538 /* Are we done with the UID tag data entry? */
539 if (RB_EMPTY_ROOT(&utd_entry->tag_ref_tree) &&
540 !utd_entry->num_pqd) {
541 DR_DEBUG("qtaguid: %s(): "
542 "erase utd_entry=%p uid=%u "
543 "by pid=%u tgid=%u uid=%u\n", __func__,
544 utd_entry, utd_entry->uid,
545 current->pid, current->tgid, current_fsuid());
546 BUG_ON(utd_entry->num_active_tags);
547 rb_erase(&utd_entry->node, &uid_tag_data_tree);
550 DR_DEBUG("qtaguid: %s(): "
551 "utd_entry=%p still has %d tags %d proc_qtu_data\n",
552 __func__, utd_entry, utd_entry->num_active_tags,
554 BUG_ON(!(utd_entry->num_active_tags ||
555 utd_entry->num_pqd));
560 * If no sock_tags are using this tag_ref,
561 * decrements refcount of utd_entry, removes tr_entry
562 * from utd_entry->tag_ref_tree and frees.
564 static void free_tag_ref_from_utd_entry(struct tag_ref *tr_entry,
565 struct uid_tag_data *utd_entry)
567 DR_DEBUG("qtaguid: %s(): %p tag=0x%llx (uid=%u)\n", __func__,
568 tr_entry, tr_entry->tn.tag,
569 get_uid_from_tag(tr_entry->tn.tag));
570 if (!tr_entry->num_sock_tags) {
571 BUG_ON(!utd_entry->num_active_tags);
572 utd_entry->num_active_tags--;
573 rb_erase(&tr_entry->tn.node, &utd_entry->tag_ref_tree);
574 DR_DEBUG("qtaguid: %s(): erased %p\n", __func__, tr_entry);
579 static void put_tag_ref_tree(tag_t full_tag, struct uid_tag_data *utd_entry)
581 struct rb_node *node;
582 struct tag_ref *tr_entry;
585 DR_DEBUG("qtaguid: %s(tag=0x%llx (uid=%u))\n", __func__,
586 full_tag, get_uid_from_tag(full_tag));
587 acct_tag = get_atag_from_tag(full_tag);
588 node = rb_first(&utd_entry->tag_ref_tree);
590 tr_entry = rb_entry(node, struct tag_ref, tn.node);
591 node = rb_next(node);
592 if (!acct_tag || tr_entry->tn.tag == full_tag)
593 free_tag_ref_from_utd_entry(tr_entry, utd_entry);
597 static int read_proc_u64(struct file *file, char __user *buf,
598 size_t size, loff_t *ppos)
600 uint64_t *valuep = PDE_DATA(file_inode(file));
604 tmp_size = scnprintf(tmp, sizeof(tmp), "%llu\n", *valuep);
605 return simple_read_from_buffer(buf, size, ppos, tmp, tmp_size);
608 static int read_proc_bool(struct file *file, char __user *buf,
609 size_t size, loff_t *ppos)
611 bool *valuep = PDE_DATA(file_inode(file));
615 tmp_size = scnprintf(tmp, sizeof(tmp), "%u\n", *valuep);
616 return simple_read_from_buffer(buf, size, ppos, tmp, tmp_size);
619 static int get_active_counter_set(tag_t tag)
622 struct tag_counter_set *tcs;
624 MT_DEBUG("qtaguid: get_active_counter_set(tag=0x%llx)"
626 tag, get_uid_from_tag(tag));
627 /* For now we only handle UID tags for active sets */
628 tag = get_utag_from_tag(tag);
629 spin_lock_bh(&tag_counter_set_list_lock);
630 tcs = tag_counter_set_tree_search(&tag_counter_set_tree, tag);
632 active_set = tcs->active_set;
633 spin_unlock_bh(&tag_counter_set_list_lock);
638 * Find the entry for tracking the specified interface.
639 * Caller must hold iface_stat_list_lock
641 static struct iface_stat *get_iface_entry(const char *ifname)
643 struct iface_stat *iface_entry;
645 /* Find the entry for tracking the specified tag within the interface */
646 if (ifname == NULL) {
647 pr_info("qtaguid: iface_stat: get() NULL device name\n");
651 /* Iterate over interfaces */
652 list_for_each_entry(iface_entry, &iface_stat_list, list) {
653 if (!strcmp(ifname, iface_entry->ifname))
661 /* This is for fmt2 only */
662 static void pp_iface_stat_header(struct seq_file *m)
666 "total_skb_rx_bytes total_skb_rx_packets "
667 "total_skb_tx_bytes total_skb_tx_packets "
668 "rx_tcp_bytes rx_tcp_packets "
669 "rx_udp_bytes rx_udp_packets "
670 "rx_other_bytes rx_other_packets "
671 "tx_tcp_bytes tx_tcp_packets "
672 "tx_udp_bytes tx_udp_packets "
673 "tx_other_bytes tx_other_packets\n"
677 static void pp_iface_stat_line(struct seq_file *m,
678 struct iface_stat *iface_entry)
680 struct data_counters *cnts;
681 int cnt_set = 0; /* We only use one set for the device */
682 cnts = &iface_entry->totals_via_skb;
683 seq_printf(m, "%s %llu %llu %llu %llu %llu %llu %llu %llu "
684 "%llu %llu %llu %llu %llu %llu %llu %llu\n",
686 dc_sum_bytes(cnts, cnt_set, IFS_RX),
687 dc_sum_packets(cnts, cnt_set, IFS_RX),
688 dc_sum_bytes(cnts, cnt_set, IFS_TX),
689 dc_sum_packets(cnts, cnt_set, IFS_TX),
690 cnts->bpc[cnt_set][IFS_RX][IFS_TCP].bytes,
691 cnts->bpc[cnt_set][IFS_RX][IFS_TCP].packets,
692 cnts->bpc[cnt_set][IFS_RX][IFS_UDP].bytes,
693 cnts->bpc[cnt_set][IFS_RX][IFS_UDP].packets,
694 cnts->bpc[cnt_set][IFS_RX][IFS_PROTO_OTHER].bytes,
695 cnts->bpc[cnt_set][IFS_RX][IFS_PROTO_OTHER].packets,
696 cnts->bpc[cnt_set][IFS_TX][IFS_TCP].bytes,
697 cnts->bpc[cnt_set][IFS_TX][IFS_TCP].packets,
698 cnts->bpc[cnt_set][IFS_TX][IFS_UDP].bytes,
699 cnts->bpc[cnt_set][IFS_TX][IFS_UDP].packets,
700 cnts->bpc[cnt_set][IFS_TX][IFS_PROTO_OTHER].bytes,
701 cnts->bpc[cnt_set][IFS_TX][IFS_PROTO_OTHER].packets);
704 struct proc_iface_stat_fmt_info {
708 static void *iface_stat_fmt_proc_start(struct seq_file *m, loff_t *pos)
710 struct proc_iface_stat_fmt_info *p = m->private;
714 * This lock will prevent iface_stat_update() from changing active,
715 * and in turn prevent an interface from unregistering itself.
717 spin_lock_bh(&iface_stat_list_lock);
719 if (unlikely(module_passive))
722 if (!n && p->fmt == 2)
723 pp_iface_stat_header(m);
725 return seq_list_start(&iface_stat_list, n);
728 static void *iface_stat_fmt_proc_next(struct seq_file *m, void *p, loff_t *pos)
730 return seq_list_next(p, &iface_stat_list, pos);
733 static void iface_stat_fmt_proc_stop(struct seq_file *m, void *p)
735 spin_unlock_bh(&iface_stat_list_lock);
738 static int iface_stat_fmt_proc_show(struct seq_file *m, void *v)
740 struct proc_iface_stat_fmt_info *p = m->private;
741 struct iface_stat *iface_entry;
742 struct rtnl_link_stats64 dev_stats, *stats;
743 struct rtnl_link_stats64 no_dev_stats = {0};
746 CT_DEBUG("qtaguid:proc iface_stat_fmt pid=%u tgid=%u uid=%u\n",
747 current->pid, current->tgid, current_fsuid());
749 iface_entry = list_entry(v, struct iface_stat, list);
751 if (iface_entry->active) {
752 stats = dev_get_stats(iface_entry->net_dev,
755 stats = &no_dev_stats;
758 * If the meaning of the data changes, then update the fmtX
762 seq_printf(m, "%s %d %llu %llu %llu %llu %llu %llu %llu %llu\n",
765 iface_entry->totals_via_dev[IFS_RX].bytes,
766 iface_entry->totals_via_dev[IFS_RX].packets,
767 iface_entry->totals_via_dev[IFS_TX].bytes,
768 iface_entry->totals_via_dev[IFS_TX].packets,
769 stats->rx_bytes, stats->rx_packets,
770 stats->tx_bytes, stats->tx_packets
773 pp_iface_stat_line(m, iface_entry);
778 static const struct file_operations read_u64_fops = {
779 .read = read_proc_u64,
780 .llseek = default_llseek,
783 static const struct file_operations read_bool_fops = {
784 .read = read_proc_bool,
785 .llseek = default_llseek,
788 static void iface_create_proc_worker(struct work_struct *work)
790 struct proc_dir_entry *proc_entry;
791 struct iface_stat_work *isw = container_of(work, struct iface_stat_work,
793 struct iface_stat *new_iface = isw->iface_entry;
795 /* iface_entries are not deleted, so safe to manipulate. */
796 proc_entry = proc_mkdir(new_iface->ifname, iface_stat_procdir);
797 if (IS_ERR_OR_NULL(proc_entry)) {
798 pr_err("qtaguid: iface_stat: create_proc(): alloc failed.\n");
803 new_iface->proc_ptr = proc_entry;
805 proc_create_data("tx_bytes", proc_iface_perms, proc_entry,
807 &new_iface->totals_via_dev[IFS_TX].bytes);
808 proc_create_data("rx_bytes", proc_iface_perms, proc_entry,
810 &new_iface->totals_via_dev[IFS_RX].bytes);
811 proc_create_data("tx_packets", proc_iface_perms, proc_entry,
813 &new_iface->totals_via_dev[IFS_TX].packets);
814 proc_create_data("rx_packets", proc_iface_perms, proc_entry,
816 &new_iface->totals_via_dev[IFS_RX].packets);
817 proc_create_data("active", proc_iface_perms, proc_entry,
818 &read_bool_fops, &new_iface->active);
820 IF_DEBUG("qtaguid: iface_stat: create_proc(): done "
821 "entry=%p dev=%s\n", new_iface, new_iface->ifname);
826 * Will set the entry's active state, and
827 * update the net_dev accordingly also.
829 static void _iface_stat_set_active(struct iface_stat *entry,
830 struct net_device *net_dev,
834 entry->net_dev = net_dev;
835 entry->active = true;
836 IF_DEBUG("qtaguid: %s(%s): "
837 "enable tracking. rfcnt=%d\n", __func__,
839 __this_cpu_read(*net_dev->pcpu_refcnt));
841 entry->active = false;
842 entry->net_dev = NULL;
843 IF_DEBUG("qtaguid: %s(%s): "
844 "disable tracking. rfcnt=%d\n", __func__,
846 __this_cpu_read(*net_dev->pcpu_refcnt));
851 /* Caller must hold iface_stat_list_lock */
852 static struct iface_stat *iface_alloc(struct net_device *net_dev)
854 struct iface_stat *new_iface;
855 struct iface_stat_work *isw;
857 new_iface = kzalloc(sizeof(*new_iface), GFP_ATOMIC);
858 if (new_iface == NULL) {
859 pr_err("qtaguid: iface_stat: create(%s): "
860 "iface_stat alloc failed\n", net_dev->name);
863 new_iface->ifname = kstrdup(net_dev->name, GFP_ATOMIC);
864 if (new_iface->ifname == NULL) {
865 pr_err("qtaguid: iface_stat: create(%s): "
866 "ifname alloc failed\n", net_dev->name);
870 spin_lock_init(&new_iface->tag_stat_list_lock);
871 new_iface->tag_stat_tree = RB_ROOT;
872 _iface_stat_set_active(new_iface, net_dev, true);
875 * ipv6 notifier chains are atomic :(
876 * No create_proc_read_entry() for you!
878 isw = kmalloc(sizeof(*isw), GFP_ATOMIC);
880 pr_err("qtaguid: iface_stat: create(%s): "
881 "work alloc failed\n", new_iface->ifname);
882 _iface_stat_set_active(new_iface, net_dev, false);
883 kfree(new_iface->ifname);
887 isw->iface_entry = new_iface;
888 INIT_WORK(&isw->iface_work, iface_create_proc_worker);
889 schedule_work(&isw->iface_work);
890 list_add(&new_iface->list, &iface_stat_list);
894 static void iface_check_stats_reset_and_adjust(struct net_device *net_dev,
895 struct iface_stat *iface)
897 struct rtnl_link_stats64 dev_stats, *stats;
900 stats = dev_get_stats(net_dev, &dev_stats);
901 /* No empty packets */
903 (stats->rx_bytes < iface->last_known[IFS_RX].bytes)
904 || (stats->tx_bytes < iface->last_known[IFS_TX].bytes);
906 IF_DEBUG("qtaguid: %s(%s): iface=%p netdev=%p "
907 "bytes rx/tx=%llu/%llu "
908 "active=%d last_known=%d "
909 "stats_rewound=%d\n", __func__,
910 net_dev ? net_dev->name : "?",
912 stats->rx_bytes, stats->tx_bytes,
913 iface->active, iface->last_known_valid, stats_rewound);
915 if (iface->active && iface->last_known_valid && stats_rewound) {
916 pr_warn_once("qtaguid: iface_stat: %s(%s): "
917 "iface reset its stats unexpectedly\n", __func__,
920 iface->totals_via_dev[IFS_TX].bytes +=
921 iface->last_known[IFS_TX].bytes;
922 iface->totals_via_dev[IFS_TX].packets +=
923 iface->last_known[IFS_TX].packets;
924 iface->totals_via_dev[IFS_RX].bytes +=
925 iface->last_known[IFS_RX].bytes;
926 iface->totals_via_dev[IFS_RX].packets +=
927 iface->last_known[IFS_RX].packets;
928 iface->last_known_valid = false;
929 IF_DEBUG("qtaguid: %s(%s): iface=%p "
930 "used last known bytes rx/tx=%llu/%llu\n", __func__,
931 iface->ifname, iface, iface->last_known[IFS_RX].bytes,
932 iface->last_known[IFS_TX].bytes);
937 * Create a new entry for tracking the specified interface.
938 * Do nothing if the entry already exists.
939 * Called when an interface is configured with a valid IP address.
941 static void iface_stat_create(struct net_device *net_dev,
942 struct in_ifaddr *ifa)
944 struct in_device *in_dev = NULL;
946 struct iface_stat *entry;
948 struct iface_stat *new_iface;
950 IF_DEBUG("qtaguid: iface_stat: create(%s): ifa=%p netdev=%p\n",
951 net_dev ? net_dev->name : "?",
954 pr_err("qtaguid: iface_stat: create(): no net dev\n");
958 ifname = net_dev->name;
960 in_dev = in_dev_get(net_dev);
962 pr_err("qtaguid: iface_stat: create(%s): no inet dev\n",
966 IF_DEBUG("qtaguid: iface_stat: create(%s): in_dev=%p\n",
968 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
969 IF_DEBUG("qtaguid: iface_stat: create(%s): "
970 "ifa=%p ifa_label=%s\n",
972 ifa->ifa_label ? ifa->ifa_label : "(null)");
973 if (ifa->ifa_label && !strcmp(ifname, ifa->ifa_label))
979 IF_DEBUG("qtaguid: iface_stat: create(%s): no matching IP\n",
983 ipaddr = ifa->ifa_local;
985 spin_lock_bh(&iface_stat_list_lock);
986 entry = get_iface_entry(ifname);
988 IF_DEBUG("qtaguid: iface_stat: create(%s): entry=%p\n",
990 iface_check_stats_reset_and_adjust(net_dev, entry);
991 _iface_stat_set_active(entry, net_dev, true);
992 IF_DEBUG("qtaguid: %s(%s): "
993 "tracking now %d on ip=%pI4\n", __func__,
994 entry->ifname, true, &ipaddr);
995 goto done_unlock_put;
998 new_iface = iface_alloc(net_dev);
999 IF_DEBUG("qtaguid: iface_stat: create(%s): done "
1000 "entry=%p ip=%pI4\n", ifname, new_iface, &ipaddr);
1002 spin_unlock_bh(&iface_stat_list_lock);
1008 static void iface_stat_create_ipv6(struct net_device *net_dev,
1009 struct inet6_ifaddr *ifa)
1011 struct in_device *in_dev;
1013 struct iface_stat *entry;
1014 struct iface_stat *new_iface;
1017 IF_DEBUG("qtaguid: iface_stat: create6(): ifa=%p netdev=%p->name=%s\n",
1018 ifa, net_dev, net_dev ? net_dev->name : "");
1020 pr_err("qtaguid: iface_stat: create6(): no net dev!\n");
1023 ifname = net_dev->name;
1025 in_dev = in_dev_get(net_dev);
1027 pr_err("qtaguid: iface_stat: create6(%s): no inet dev\n",
1032 IF_DEBUG("qtaguid: iface_stat: create6(%s): in_dev=%p\n",
1036 IF_DEBUG("qtaguid: iface_stat: create6(%s): no matching IP\n",
1040 addr_type = ipv6_addr_type(&ifa->addr);
1042 spin_lock_bh(&iface_stat_list_lock);
1043 entry = get_iface_entry(ifname);
1044 if (entry != NULL) {
1045 IF_DEBUG("qtaguid: %s(%s): entry=%p\n", __func__,
1047 iface_check_stats_reset_and_adjust(net_dev, entry);
1048 _iface_stat_set_active(entry, net_dev, true);
1049 IF_DEBUG("qtaguid: %s(%s): "
1050 "tracking now %d on ip=%pI6c\n", __func__,
1051 entry->ifname, true, &ifa->addr);
1052 goto done_unlock_put;
1055 new_iface = iface_alloc(net_dev);
1056 IF_DEBUG("qtaguid: iface_stat: create6(%s): done "
1057 "entry=%p ip=%pI6c\n", ifname, new_iface, &ifa->addr);
1060 spin_unlock_bh(&iface_stat_list_lock);
1065 static struct sock_tag *get_sock_stat_nl(const struct sock *sk)
1067 MT_DEBUG("qtaguid: get_sock_stat_nl(sk=%p)\n", sk);
1068 return sock_tag_tree_search(&sock_tag_tree, sk);
1071 static struct sock_tag *get_sock_stat(const struct sock *sk)
1073 struct sock_tag *sock_tag_entry;
1074 MT_DEBUG("qtaguid: get_sock_stat(sk=%p)\n", sk);
1077 spin_lock_bh(&sock_tag_list_lock);
1078 sock_tag_entry = get_sock_stat_nl(sk);
1079 spin_unlock_bh(&sock_tag_list_lock);
1080 return sock_tag_entry;
1083 static int ipx_proto(const struct sk_buff *skb,
1084 struct xt_action_param *par)
1086 int thoff = 0, tproto;
1088 switch (par->family) {
1090 tproto = ipv6_find_hdr(skb, &thoff, -1, NULL, NULL);
1092 MT_DEBUG("%s(): transport header not found in ipv6"
1093 " skb=%p\n", __func__, skb);
1096 tproto = ip_hdr(skb)->protocol;
1099 tproto = IPPROTO_RAW;
1105 data_counters_update(struct data_counters *dc, int set,
1106 enum ifs_tx_rx direction, int proto, int bytes)
1110 dc_add_byte_packets(dc, set, direction, IFS_TCP, bytes, 1);
1113 dc_add_byte_packets(dc, set, direction, IFS_UDP, bytes, 1);
1117 dc_add_byte_packets(dc, set, direction, IFS_PROTO_OTHER, bytes,
1124 * Update stats for the specified interface. Do nothing if the entry
1125 * does not exist (when a device was never configured with an IP address).
1126 * Called when an device is being unregistered.
1128 static void iface_stat_update(struct net_device *net_dev, bool stash_only)
1130 struct rtnl_link_stats64 dev_stats, *stats;
1131 struct iface_stat *entry;
1133 stats = dev_get_stats(net_dev, &dev_stats);
1134 spin_lock_bh(&iface_stat_list_lock);
1135 entry = get_iface_entry(net_dev->name);
1136 if (entry == NULL) {
1137 IF_DEBUG("qtaguid: iface_stat: update(%s): not tracked\n",
1139 spin_unlock_bh(&iface_stat_list_lock);
1143 IF_DEBUG("qtaguid: %s(%s): entry=%p\n", __func__,
1144 net_dev->name, entry);
1145 if (!entry->active) {
1146 IF_DEBUG("qtaguid: %s(%s): already disabled\n", __func__,
1148 spin_unlock_bh(&iface_stat_list_lock);
1153 entry->last_known[IFS_TX].bytes = stats->tx_bytes;
1154 entry->last_known[IFS_TX].packets = stats->tx_packets;
1155 entry->last_known[IFS_RX].bytes = stats->rx_bytes;
1156 entry->last_known[IFS_RX].packets = stats->rx_packets;
1157 entry->last_known_valid = true;
1158 IF_DEBUG("qtaguid: %s(%s): "
1159 "dev stats stashed rx/tx=%llu/%llu\n", __func__,
1160 net_dev->name, stats->rx_bytes, stats->tx_bytes);
1161 spin_unlock_bh(&iface_stat_list_lock);
1164 entry->totals_via_dev[IFS_TX].bytes += stats->tx_bytes;
1165 entry->totals_via_dev[IFS_TX].packets += stats->tx_packets;
1166 entry->totals_via_dev[IFS_RX].bytes += stats->rx_bytes;
1167 entry->totals_via_dev[IFS_RX].packets += stats->rx_packets;
1168 /* We don't need the last_known[] anymore */
1169 entry->last_known_valid = false;
1170 _iface_stat_set_active(entry, net_dev, false);
1171 IF_DEBUG("qtaguid: %s(%s): "
1172 "disable tracking. rx/tx=%llu/%llu\n", __func__,
1173 net_dev->name, stats->rx_bytes, stats->tx_bytes);
1174 spin_unlock_bh(&iface_stat_list_lock);
1178 * Update stats for the specified interface from the skb.
1179 * Do nothing if the entry
1180 * does not exist (when a device was never configured with an IP address).
1181 * Called on each sk.
1183 static void iface_stat_update_from_skb(const struct sk_buff *skb,
1184 struct xt_action_param *par)
1186 struct iface_stat *entry;
1187 const struct net_device *el_dev;
1188 enum ifs_tx_rx direction = par->in ? IFS_RX : IFS_TX;
1189 int bytes = skb->len;
1193 MT_DEBUG("qtaguid[%d]: no skb->dev\n", par->hooknum);
1194 el_dev = par->in ? : par->out;
1196 const struct net_device *other_dev;
1198 other_dev = par->in ? : par->out;
1199 if (el_dev != other_dev) {
1200 MT_DEBUG("qtaguid[%d]: skb->dev=%p %s vs "
1201 "par->(in/out)=%p %s\n",
1202 par->hooknum, el_dev, el_dev->name, other_dev,
1207 if (unlikely(!el_dev)) {
1208 pr_err_ratelimited("qtaguid[%d]: %s(): no par->in/out?!!\n",
1209 par->hooknum, __func__);
1211 } else if (unlikely(!el_dev->name)) {
1212 pr_err_ratelimited("qtaguid[%d]: %s(): no dev->name?!!\n",
1213 par->hooknum, __func__);
1216 proto = ipx_proto(skb, par);
1217 MT_DEBUG("qtaguid[%d]: dev name=%s type=%d fam=%d proto=%d\n",
1218 par->hooknum, el_dev->name, el_dev->type,
1219 par->family, proto);
1222 spin_lock_bh(&iface_stat_list_lock);
1223 entry = get_iface_entry(el_dev->name);
1224 if (entry == NULL) {
1225 IF_DEBUG("qtaguid: iface_stat: %s(%s): not tracked\n",
1226 __func__, el_dev->name);
1227 spin_unlock_bh(&iface_stat_list_lock);
1231 IF_DEBUG("qtaguid: %s(%s): entry=%p\n", __func__,
1232 el_dev->name, entry);
1234 data_counters_update(&entry->totals_via_skb, 0, direction, proto,
1236 spin_unlock_bh(&iface_stat_list_lock);
1239 static void tag_stat_update(struct tag_stat *tag_entry,
1240 enum ifs_tx_rx direction, int proto, int bytes)
1243 active_set = get_active_counter_set(tag_entry->tn.tag);
1244 MT_DEBUG("qtaguid: tag_stat_update(tag=0x%llx (uid=%u) set=%d "
1245 "dir=%d proto=%d bytes=%d)\n",
1246 tag_entry->tn.tag, get_uid_from_tag(tag_entry->tn.tag),
1247 active_set, direction, proto, bytes);
1248 data_counters_update(&tag_entry->counters, active_set, direction,
1250 if (tag_entry->parent_counters)
1251 data_counters_update(tag_entry->parent_counters, active_set,
1252 direction, proto, bytes);
1256 * Create a new entry for tracking the specified {acct_tag,uid_tag} within
1258 * iface_entry->tag_stat_list_lock should be held.
1260 static struct tag_stat *create_if_tag_stat(struct iface_stat *iface_entry,
1263 struct tag_stat *new_tag_stat_entry = NULL;
1264 IF_DEBUG("qtaguid: iface_stat: %s(): ife=%p tag=0x%llx"
1265 " (uid=%u)\n", __func__,
1266 iface_entry, tag, get_uid_from_tag(tag));
1267 new_tag_stat_entry = kzalloc(sizeof(*new_tag_stat_entry), GFP_ATOMIC);
1268 if (!new_tag_stat_entry) {
1269 pr_err("qtaguid: iface_stat: tag stat alloc failed\n");
1272 new_tag_stat_entry->tn.tag = tag;
1273 tag_stat_tree_insert(new_tag_stat_entry, &iface_entry->tag_stat_tree);
1275 return new_tag_stat_entry;
1278 static void if_tag_stat_update(const char *ifname, uid_t uid,
1279 const struct sock *sk, enum ifs_tx_rx direction,
1280 int proto, int bytes)
1282 struct tag_stat *tag_stat_entry;
1283 tag_t tag, acct_tag;
1285 struct data_counters *uid_tag_counters;
1286 struct sock_tag *sock_tag_entry;
1287 struct iface_stat *iface_entry;
1288 struct tag_stat *new_tag_stat = NULL;
1289 MT_DEBUG("qtaguid: if_tag_stat_update(ifname=%s "
1290 "uid=%u sk=%p dir=%d proto=%d bytes=%d)\n",
1291 ifname, uid, sk, direction, proto, bytes);
1294 iface_entry = get_iface_entry(ifname);
1296 pr_err_ratelimited("qtaguid: iface_stat: stat_update() "
1297 "%s not found\n", ifname);
1300 /* It is ok to process data when an iface_entry is inactive */
1302 MT_DEBUG("qtaguid: iface_stat: stat_update() dev=%s entry=%p\n",
1303 ifname, iface_entry);
1306 * Look for a tagged sock.
1307 * It will have an acct_uid.
1309 sock_tag_entry = get_sock_stat(sk);
1310 if (sock_tag_entry) {
1311 tag = sock_tag_entry->tag;
1312 acct_tag = get_atag_from_tag(tag);
1313 uid_tag = get_utag_from_tag(tag);
1315 acct_tag = make_atag_from_value(0);
1316 tag = combine_atag_with_uid(acct_tag, uid);
1317 uid_tag = make_tag_from_uid(uid);
1319 MT_DEBUG("qtaguid: iface_stat: stat_update(): "
1320 " looking for tag=0x%llx (uid=%u) in ife=%p\n",
1321 tag, get_uid_from_tag(tag), iface_entry);
1322 /* Loop over tag list under this interface for {acct_tag,uid_tag} */
1323 spin_lock_bh(&iface_entry->tag_stat_list_lock);
1325 tag_stat_entry = tag_stat_tree_search(&iface_entry->tag_stat_tree,
1327 if (tag_stat_entry) {
1329 * Updating the {acct_tag, uid_tag} entry handles both stats:
1330 * {0, uid_tag} will also get updated.
1332 tag_stat_update(tag_stat_entry, direction, proto, bytes);
1333 spin_unlock_bh(&iface_entry->tag_stat_list_lock);
1337 /* Loop over tag list under this interface for {0,uid_tag} */
1338 tag_stat_entry = tag_stat_tree_search(&iface_entry->tag_stat_tree,
1340 if (!tag_stat_entry) {
1341 /* Here: the base uid_tag did not exist */
1343 * No parent counters. So
1344 * - No {0, uid_tag} stats and no {acc_tag, uid_tag} stats.
1346 new_tag_stat = create_if_tag_stat(iface_entry, uid_tag);
1349 uid_tag_counters = &new_tag_stat->counters;
1351 uid_tag_counters = &tag_stat_entry->counters;
1355 /* Create the child {acct_tag, uid_tag} and hook up parent. */
1356 new_tag_stat = create_if_tag_stat(iface_entry, tag);
1359 new_tag_stat->parent_counters = uid_tag_counters;
1362 * For new_tag_stat to be still NULL here would require:
1363 * {0, uid_tag} exists
1364 * and {acct_tag, uid_tag} doesn't exist
1365 * AND acct_tag == 0.
1366 * Impossible. This reassures us that new_tag_stat
1367 * below will always be assigned.
1369 BUG_ON(!new_tag_stat);
1371 tag_stat_update(new_tag_stat, direction, proto, bytes);
1373 spin_unlock_bh(&iface_entry->tag_stat_list_lock);
1376 static int iface_netdev_event_handler(struct notifier_block *nb,
1377 unsigned long event, void *ptr) {
1378 struct net_device *dev = ptr;
1380 if (unlikely(module_passive))
1383 IF_DEBUG("qtaguid: iface_stat: netdev_event(): "
1384 "ev=0x%lx/%s netdev=%p->name=%s\n",
1385 event, netdev_evt_str(event), dev, dev ? dev->name : "");
1389 iface_stat_create(dev, NULL);
1390 atomic64_inc(&qtu_events.iface_events);
1393 case NETDEV_UNREGISTER:
1394 iface_stat_update(dev, event == NETDEV_DOWN);
1395 atomic64_inc(&qtu_events.iface_events);
1401 static int iface_inet6addr_event_handler(struct notifier_block *nb,
1402 unsigned long event, void *ptr)
1404 struct inet6_ifaddr *ifa = ptr;
1405 struct net_device *dev;
1407 if (unlikely(module_passive))
1410 IF_DEBUG("qtaguid: iface_stat: inet6addr_event(): "
1411 "ev=0x%lx/%s ifa=%p\n",
1412 event, netdev_evt_str(event), ifa);
1416 BUG_ON(!ifa || !ifa->idev);
1417 dev = (struct net_device *)ifa->idev->dev;
1418 iface_stat_create_ipv6(dev, ifa);
1419 atomic64_inc(&qtu_events.iface_events);
1422 case NETDEV_UNREGISTER:
1423 BUG_ON(!ifa || !ifa->idev);
1424 dev = (struct net_device *)ifa->idev->dev;
1425 iface_stat_update(dev, event == NETDEV_DOWN);
1426 atomic64_inc(&qtu_events.iface_events);
1432 static int iface_inetaddr_event_handler(struct notifier_block *nb,
1433 unsigned long event, void *ptr)
1435 struct in_ifaddr *ifa = ptr;
1436 struct net_device *dev;
1438 if (unlikely(module_passive))
1441 IF_DEBUG("qtaguid: iface_stat: inetaddr_event(): "
1442 "ev=0x%lx/%s ifa=%p\n",
1443 event, netdev_evt_str(event), ifa);
1447 BUG_ON(!ifa || !ifa->ifa_dev);
1448 dev = ifa->ifa_dev->dev;
1449 iface_stat_create(dev, ifa);
1450 atomic64_inc(&qtu_events.iface_events);
1453 case NETDEV_UNREGISTER:
1454 BUG_ON(!ifa || !ifa->ifa_dev);
1455 dev = ifa->ifa_dev->dev;
1456 iface_stat_update(dev, event == NETDEV_DOWN);
1457 atomic64_inc(&qtu_events.iface_events);
1463 static struct notifier_block iface_netdev_notifier_blk = {
1464 .notifier_call = iface_netdev_event_handler,
1467 static struct notifier_block iface_inetaddr_notifier_blk = {
1468 .notifier_call = iface_inetaddr_event_handler,
1471 static struct notifier_block iface_inet6addr_notifier_blk = {
1472 .notifier_call = iface_inet6addr_event_handler,
1475 static const struct seq_operations iface_stat_fmt_proc_seq_ops = {
1476 .start = iface_stat_fmt_proc_start,
1477 .next = iface_stat_fmt_proc_next,
1478 .stop = iface_stat_fmt_proc_stop,
1479 .show = iface_stat_fmt_proc_show,
1482 static int proc_iface_stat_fmt_open(struct inode *inode, struct file *file)
1484 struct proc_iface_stat_fmt_info *s;
1486 s = __seq_open_private(file, &iface_stat_fmt_proc_seq_ops,
1487 sizeof(struct proc_iface_stat_fmt_info));
1491 s->fmt = (int)PDE_DATA(inode);
1495 static const struct file_operations proc_iface_stat_fmt_fops = {
1496 .open = proc_iface_stat_fmt_open,
1498 .llseek = seq_lseek,
1499 .release = seq_release,
1502 static int __init iface_stat_init(struct proc_dir_entry *parent_procdir)
1506 iface_stat_procdir = proc_mkdir(iface_stat_procdirname, parent_procdir);
1507 if (!iface_stat_procdir) {
1508 pr_err("qtaguid: iface_stat: init failed to create proc entry\n");
1513 iface_stat_all_procfile = proc_create_data(iface_stat_all_procfilename,
1516 &proc_iface_stat_fmt_fops,
1517 (void *)1 /* fmt1 */);
1518 if (!iface_stat_all_procfile) {
1519 pr_err("qtaguid: iface_stat: init "
1520 " failed to create stat_old proc entry\n");
1525 iface_stat_fmt_procfile = proc_create_data(iface_stat_fmt_procfilename,
1528 &proc_iface_stat_fmt_fops,
1529 (void *)2 /* fmt2 */);
1530 if (!iface_stat_fmt_procfile) {
1531 pr_err("qtaguid: iface_stat: init "
1532 " failed to create stat_all proc entry\n");
1534 goto err_zap_all_stats_entry;
1538 err = register_netdevice_notifier(&iface_netdev_notifier_blk);
1540 pr_err("qtaguid: iface_stat: init "
1541 "failed to register dev event handler\n");
1542 goto err_zap_all_stats_entries;
1544 err = register_inetaddr_notifier(&iface_inetaddr_notifier_blk);
1546 pr_err("qtaguid: iface_stat: init "
1547 "failed to register ipv4 dev event handler\n");
1551 err = register_inet6addr_notifier(&iface_inet6addr_notifier_blk);
1553 pr_err("qtaguid: iface_stat: init "
1554 "failed to register ipv6 dev event handler\n");
1555 goto err_unreg_ip4_addr;
1560 unregister_inetaddr_notifier(&iface_inetaddr_notifier_blk);
1562 unregister_netdevice_notifier(&iface_netdev_notifier_blk);
1563 err_zap_all_stats_entries:
1564 remove_proc_entry(iface_stat_fmt_procfilename, parent_procdir);
1565 err_zap_all_stats_entry:
1566 remove_proc_entry(iface_stat_all_procfilename, parent_procdir);
1568 remove_proc_entry(iface_stat_procdirname, parent_procdir);
1573 static struct sock *qtaguid_find_sk(const struct sk_buff *skb,
1574 struct xt_action_param *par)
1577 unsigned int hook_mask = (1 << par->hooknum);
1579 MT_DEBUG("qtaguid: find_sk(skb=%p) hooknum=%d family=%d\n", skb,
1580 par->hooknum, par->family);
1583 * Let's not abuse the the xt_socket_get*_sk(), or else it will
1584 * return garbage SKs.
1586 if (!(hook_mask & XT_SOCKET_SUPPORTED_HOOKS))
1589 switch (par->family) {
1591 sk = xt_socket_get6_sk(skb, par);
1594 sk = xt_socket_get4_sk(skb, par);
1601 * Seems to be issues on the file ptr for TCP_TIME_WAIT SKs.
1602 * http://kerneltrap.org/mailarchive/linux-netdev/2010/10/21/6287959
1603 * Not fixed in 3.0-r3 :(
1606 MT_DEBUG("qtaguid: %p->sk_proto=%u "
1607 "->sk_state=%d\n", sk, sk->sk_protocol, sk->sk_state);
1608 if (sk->sk_state == TCP_TIME_WAIT) {
1609 xt_socket_put_sk(sk);
1616 static void account_for_uid(const struct sk_buff *skb,
1617 const struct sock *alternate_sk, uid_t uid,
1618 struct xt_action_param *par)
1620 const struct net_device *el_dev;
1623 MT_DEBUG("qtaguid[%d]: no skb->dev\n", par->hooknum);
1624 el_dev = par->in ? : par->out;
1626 const struct net_device *other_dev;
1628 other_dev = par->in ? : par->out;
1629 if (el_dev != other_dev) {
1630 MT_DEBUG("qtaguid[%d]: skb->dev=%p %s vs "
1631 "par->(in/out)=%p %s\n",
1632 par->hooknum, el_dev, el_dev->name, other_dev,
1637 if (unlikely(!el_dev)) {
1638 pr_info("qtaguid[%d]: no par->in/out?!!\n", par->hooknum);
1639 } else if (unlikely(!el_dev->name)) {
1640 pr_info("qtaguid[%d]: no dev->name?!!\n", par->hooknum);
1642 int proto = ipx_proto(skb, par);
1643 MT_DEBUG("qtaguid[%d]: dev name=%s type=%d fam=%d proto=%d\n",
1644 par->hooknum, el_dev->name, el_dev->type,
1645 par->family, proto);
1647 if_tag_stat_update(el_dev->name, uid,
1648 skb->sk ? skb->sk : alternate_sk,
1649 par->in ? IFS_RX : IFS_TX,
1654 static bool qtaguid_mt(const struct sk_buff *skb, struct xt_action_param *par)
1656 const struct xt_qtaguid_match_info *info = par->matchinfo;
1657 const struct file *filp;
1658 bool got_sock = false;
1663 if (unlikely(module_passive))
1664 return (info->match ^ info->invert) == 0;
1666 MT_DEBUG("qtaguid[%d]: entered skb=%p par->in=%p/out=%p fam=%d\n",
1667 par->hooknum, skb, par->in, par->out, par->family);
1669 atomic64_inc(&qtu_events.match_calls);
1671 res = (info->match ^ info->invert) == 0;
1675 switch (par->hooknum) {
1676 case NF_INET_PRE_ROUTING:
1677 case NF_INET_POST_ROUTING:
1678 atomic64_inc(&qtu_events.match_calls_prepost);
1679 iface_stat_update_from_skb(skb, par);
1681 * We are done in pre/post. The skb will get processed
1684 res = (info->match ^ info->invert);
1687 /* default: Fall through and do UID releated work */
1693 * A missing sk->sk_socket happens when packets are in-flight
1694 * and the matching socket is already closed and gone.
1696 sk = qtaguid_find_sk(skb, par);
1698 * If we got the socket from the find_sk(), we will need to put
1699 * it back, as nf_tproxy_get_sock_v4() got it.
1703 atomic64_inc(&qtu_events.match_found_sk_in_ct);
1705 atomic64_inc(&qtu_events.match_found_no_sk_in_ct);
1707 atomic64_inc(&qtu_events.match_found_sk);
1709 MT_DEBUG("qtaguid[%d]: sk=%p got_sock=%d fam=%d proto=%d\n",
1710 par->hooknum, sk, got_sock, par->family, ipx_proto(skb, par));
1712 MT_DEBUG("qtaguid[%d]: sk=%p->sk_socket=%p->file=%p\n",
1713 par->hooknum, sk, sk->sk_socket,
1714 sk->sk_socket ? sk->sk_socket->file : (void *)-1LL);
1715 filp = sk->sk_socket ? sk->sk_socket->file : NULL;
1716 MT_DEBUG("qtaguid[%d]: filp...uid=%u\n",
1717 par->hooknum, filp ? filp->f_cred->fsuid : -1);
1720 if (sk == NULL || sk->sk_socket == NULL) {
1722 * Here, the qtaguid_find_sk() using connection tracking
1723 * couldn't find the owner, so for now we just count them
1724 * against the system.
1727 * TODO: unhack how to force just accounting.
1728 * For now we only do iface stats when the uid-owner is not
1731 if (!(info->match & XT_QTAGUID_UID))
1732 account_for_uid(skb, sk, 0, par);
1733 MT_DEBUG("qtaguid[%d]: leaving (sk?sk->sk_socket)=%p\n",
1735 sk ? sk->sk_socket : NULL);
1736 res = (info->match ^ info->invert) == 0;
1737 atomic64_inc(&qtu_events.match_no_sk);
1738 goto put_sock_ret_res;
1739 } else if (info->match & info->invert & XT_QTAGUID_SOCKET) {
1741 goto put_sock_ret_res;
1743 filp = sk->sk_socket->file;
1745 MT_DEBUG("qtaguid[%d]: leaving filp=NULL\n", par->hooknum);
1746 account_for_uid(skb, sk, 0, par);
1747 res = ((info->match ^ info->invert) &
1748 (XT_QTAGUID_UID | XT_QTAGUID_GID)) == 0;
1749 atomic64_inc(&qtu_events.match_no_sk_file);
1750 goto put_sock_ret_res;
1752 sock_uid = filp->f_cred->fsuid;
1754 * TODO: unhack how to force just accounting.
1755 * For now we only do iface stats when the uid-owner is not requested
1757 if (!(info->match & XT_QTAGUID_UID))
1758 account_for_uid(skb, sk, sock_uid, par);
1761 * The following two tests fail the match when:
1762 * id not in range AND no inverted condition requested
1763 * or id in range AND inverted condition requested
1764 * Thus (!a && b) || (a && !b) == a ^ b
1766 if (info->match & XT_QTAGUID_UID)
1767 if ((filp->f_cred->fsuid >= info->uid_min &&
1768 filp->f_cred->fsuid <= info->uid_max) ^
1769 !(info->invert & XT_QTAGUID_UID)) {
1770 MT_DEBUG("qtaguid[%d]: leaving uid not matching\n",
1773 goto put_sock_ret_res;
1775 if (info->match & XT_QTAGUID_GID)
1776 if ((filp->f_cred->fsgid >= info->gid_min &&
1777 filp->f_cred->fsgid <= info->gid_max) ^
1778 !(info->invert & XT_QTAGUID_GID)) {
1779 MT_DEBUG("qtaguid[%d]: leaving gid not matching\n",
1782 goto put_sock_ret_res;
1785 MT_DEBUG("qtaguid[%d]: leaving matched\n", par->hooknum);
1790 xt_socket_put_sk(sk);
1792 MT_DEBUG("qtaguid[%d]: left %d\n", par->hooknum, res);
1797 /* This function is not in xt_qtaguid_print.c because of locks visibility */
1798 static void prdebug_full_state(int indent_level, const char *fmt, ...)
1804 if (!unlikely(qtaguid_debug_mask & DDEBUG_MASK))
1807 fmt_buff = kasprintf(GFP_ATOMIC,
1808 "qtaguid: %s(): %s {\n", __func__, fmt);
1810 va_start(args, fmt);
1811 buff = kvasprintf(GFP_ATOMIC,
1814 pr_debug("%s", buff);
1819 spin_lock_bh(&sock_tag_list_lock);
1820 prdebug_sock_tag_tree(indent_level, &sock_tag_tree);
1821 spin_unlock_bh(&sock_tag_list_lock);
1823 spin_lock_bh(&sock_tag_list_lock);
1824 spin_lock_bh(&uid_tag_data_tree_lock);
1825 prdebug_uid_tag_data_tree(indent_level, &uid_tag_data_tree);
1826 prdebug_proc_qtu_data_tree(indent_level, &proc_qtu_data_tree);
1827 spin_unlock_bh(&uid_tag_data_tree_lock);
1828 spin_unlock_bh(&sock_tag_list_lock);
1830 spin_lock_bh(&iface_stat_list_lock);
1831 prdebug_iface_stat_list(indent_level, &iface_stat_list);
1832 spin_unlock_bh(&iface_stat_list_lock);
1834 pr_debug("qtaguid: %s(): }\n", __func__);
1837 static void prdebug_full_state(int indent_level, const char *fmt, ...) {}
1840 struct proc_ctrl_print_info {
1841 struct sock *sk; /* socket found by reading to sk_pos */
1845 static void *qtaguid_ctrl_proc_next(struct seq_file *m, void *v, loff_t *pos)
1847 struct proc_ctrl_print_info *pcpi = m->private;
1848 struct sock_tag *sock_tag_entry = v;
1849 struct rb_node *node;
1853 if (!v || v == SEQ_START_TOKEN)
1856 node = rb_next(&sock_tag_entry->sock_node);
1859 sock_tag_entry = SEQ_START_TOKEN;
1861 sock_tag_entry = rb_entry(node, struct sock_tag, sock_node);
1862 pcpi->sk = sock_tag_entry->sk;
1864 pcpi->sk_pos = *pos;
1865 return sock_tag_entry;
1868 static void *qtaguid_ctrl_proc_start(struct seq_file *m, loff_t *pos)
1870 struct proc_ctrl_print_info *pcpi = m->private;
1871 struct sock_tag *sock_tag_entry;
1872 struct rb_node *node;
1874 spin_lock_bh(&sock_tag_list_lock);
1876 if (unlikely(module_passive))
1881 node = rb_first(&sock_tag_tree);
1884 return SEQ_START_TOKEN;
1886 sock_tag_entry = rb_entry(node, struct sock_tag, sock_node);
1887 pcpi->sk = sock_tag_entry->sk;
1889 sock_tag_entry = (pcpi->sk ? get_sock_stat_nl(pcpi->sk) :
1890 NULL) ?: SEQ_START_TOKEN;
1891 if (*pos != pcpi->sk_pos) {
1892 /* seq_read skipped a next call */
1893 *pos = pcpi->sk_pos;
1894 return qtaguid_ctrl_proc_next(m, sock_tag_entry, pos);
1897 return sock_tag_entry;
1900 static void qtaguid_ctrl_proc_stop(struct seq_file *m, void *v)
1902 spin_unlock_bh(&sock_tag_list_lock);
1906 * Procfs reader to get all active socket tags using style "1)" as described in
1909 static int qtaguid_ctrl_proc_show(struct seq_file *m, void *v)
1911 struct sock_tag *sock_tag_entry = v;
1915 CT_DEBUG("qtaguid: proc ctrl pid=%u tgid=%u uid=%u\n",
1916 current->pid, current->tgid, current_fsuid());
1918 if (sock_tag_entry != SEQ_START_TOKEN) {
1919 uid = get_uid_from_tag(sock_tag_entry->tag);
1920 CT_DEBUG("qtaguid: proc_read(): sk=%p tag=0x%llx (uid=%u) "
1923 sock_tag_entry->tag,
1927 f_count = atomic_long_read(
1928 &sock_tag_entry->socket->file->f_count);
1929 seq_printf(m, "sock=%p tag=0x%llx (uid=%u) pid=%u "
1932 sock_tag_entry->tag, uid,
1933 sock_tag_entry->pid, f_count);
1935 seq_printf(m, "events: sockets_tagged=%llu "
1936 "sockets_untagged=%llu "
1937 "counter_set_changes=%llu "
1939 "iface_events=%llu "
1941 "match_calls_prepost=%llu "
1942 "match_found_sk=%llu "
1943 "match_found_sk_in_ct=%llu "
1944 "match_found_no_sk_in_ct=%llu "
1946 "match_no_sk_file=%llu\n",
1947 atomic64_read(&qtu_events.sockets_tagged),
1948 atomic64_read(&qtu_events.sockets_untagged),
1949 atomic64_read(&qtu_events.counter_set_changes),
1950 atomic64_read(&qtu_events.delete_cmds),
1951 atomic64_read(&qtu_events.iface_events),
1952 atomic64_read(&qtu_events.match_calls),
1953 atomic64_read(&qtu_events.match_calls_prepost),
1954 atomic64_read(&qtu_events.match_found_sk),
1955 atomic64_read(&qtu_events.match_found_sk_in_ct),
1956 atomic64_read(&qtu_events.match_found_no_sk_in_ct),
1957 atomic64_read(&qtu_events.match_no_sk),
1958 atomic64_read(&qtu_events.match_no_sk_file));
1960 /* Count the following as part of the last item_index */
1961 prdebug_full_state(0, "proc ctrl");
1968 * Delete socket tags, and stat tags associated with a given
1969 * accouting tag and uid.
1971 static int ctrl_cmd_delete(const char *input)
1979 struct iface_stat *iface_entry;
1980 struct rb_node *node;
1981 struct sock_tag *st_entry;
1982 struct rb_root st_to_free_tree = RB_ROOT;
1983 struct tag_stat *ts_entry;
1984 struct tag_counter_set *tcs_entry;
1985 struct tag_ref *tr_entry;
1986 struct uid_tag_data *utd_entry;
1988 argc = sscanf(input, "%c %llu %u", &cmd, &acct_tag, &uid);
1989 CT_DEBUG("qtaguid: ctrl_delete(%s): argc=%d cmd=%c "
1990 "user_tag=0x%llx uid=%u\n", input, argc, cmd,
1996 if (!valid_atag(acct_tag)) {
1997 pr_info("qtaguid: ctrl_delete(%s): invalid tag\n", input);
2002 uid = current_fsuid();
2003 } else if (!can_impersonate_uid(uid)) {
2004 pr_info("qtaguid: ctrl_delete(%s): "
2005 "insufficient priv from pid=%u tgid=%u uid=%u\n",
2006 input, current->pid, current->tgid, current_fsuid());
2011 tag = combine_atag_with_uid(acct_tag, uid);
2012 CT_DEBUG("qtaguid: ctrl_delete(%s): "
2013 "looking for tag=0x%llx (uid=%u)\n",
2016 /* Delete socket tags */
2017 spin_lock_bh(&sock_tag_list_lock);
2018 node = rb_first(&sock_tag_tree);
2020 st_entry = rb_entry(node, struct sock_tag, sock_node);
2021 entry_uid = get_uid_from_tag(st_entry->tag);
2022 node = rb_next(node);
2023 if (entry_uid != uid)
2026 CT_DEBUG("qtaguid: ctrl_delete(%s): st tag=0x%llx (uid=%u)\n",
2027 input, st_entry->tag, entry_uid);
2029 if (!acct_tag || st_entry->tag == tag) {
2030 rb_erase(&st_entry->sock_node, &sock_tag_tree);
2031 /* Can't sockfd_put() within spinlock, do it later. */
2032 sock_tag_tree_insert(st_entry, &st_to_free_tree);
2033 tr_entry = lookup_tag_ref(st_entry->tag, NULL);
2034 BUG_ON(tr_entry->num_sock_tags <= 0);
2035 tr_entry->num_sock_tags--;
2037 * TODO: remove if, and start failing.
2038 * This is a hack to work around the fact that in some
2039 * places we have "if (IS_ERR_OR_NULL(pqd_entry))"
2040 * and are trying to work around apps
2041 * that didn't open the /dev/xt_qtaguid.
2043 if (st_entry->list.next && st_entry->list.prev)
2044 list_del(&st_entry->list);
2047 spin_unlock_bh(&sock_tag_list_lock);
2049 sock_tag_tree_erase(&st_to_free_tree);
2051 /* Delete tag counter-sets */
2052 spin_lock_bh(&tag_counter_set_list_lock);
2053 /* Counter sets are only on the uid tag, not full tag */
2054 tcs_entry = tag_counter_set_tree_search(&tag_counter_set_tree, tag);
2056 CT_DEBUG("qtaguid: ctrl_delete(%s): "
2057 "erase tcs: tag=0x%llx (uid=%u) set=%d\n",
2060 get_uid_from_tag(tcs_entry->tn.tag),
2061 tcs_entry->active_set);
2062 rb_erase(&tcs_entry->tn.node, &tag_counter_set_tree);
2065 spin_unlock_bh(&tag_counter_set_list_lock);
2068 * If acct_tag is 0, then all entries belonging to uid are
2071 spin_lock_bh(&iface_stat_list_lock);
2072 list_for_each_entry(iface_entry, &iface_stat_list, list) {
2073 spin_lock_bh(&iface_entry->tag_stat_list_lock);
2074 node = rb_first(&iface_entry->tag_stat_tree);
2076 ts_entry = rb_entry(node, struct tag_stat, tn.node);
2077 entry_uid = get_uid_from_tag(ts_entry->tn.tag);
2078 node = rb_next(node);
2080 CT_DEBUG("qtaguid: ctrl_delete(%s): "
2081 "ts tag=0x%llx (uid=%u)\n",
2082 input, ts_entry->tn.tag, entry_uid);
2084 if (entry_uid != uid)
2086 if (!acct_tag || ts_entry->tn.tag == tag) {
2087 CT_DEBUG("qtaguid: ctrl_delete(%s): "
2088 "erase ts: %s 0x%llx %u\n",
2089 input, iface_entry->ifname,
2090 get_atag_from_tag(ts_entry->tn.tag),
2092 rb_erase(&ts_entry->tn.node,
2093 &iface_entry->tag_stat_tree);
2097 spin_unlock_bh(&iface_entry->tag_stat_list_lock);
2099 spin_unlock_bh(&iface_stat_list_lock);
2101 /* Cleanup the uid_tag_data */
2102 spin_lock_bh(&uid_tag_data_tree_lock);
2103 node = rb_first(&uid_tag_data_tree);
2105 utd_entry = rb_entry(node, struct uid_tag_data, node);
2106 entry_uid = utd_entry->uid;
2107 node = rb_next(node);
2109 CT_DEBUG("qtaguid: ctrl_delete(%s): "
2113 if (entry_uid != uid)
2116 * Go over the tag_refs, and those that don't have
2117 * sock_tags using them are freed.
2119 put_tag_ref_tree(tag, utd_entry);
2120 put_utd_entry(utd_entry);
2122 spin_unlock_bh(&uid_tag_data_tree_lock);
2124 atomic64_inc(&qtu_events.delete_cmds);
2131 static int ctrl_cmd_counter_set(const char *input)
2137 struct tag_counter_set *tcs;
2140 argc = sscanf(input, "%c %d %u", &cmd, &counter_set, &uid);
2141 CT_DEBUG("qtaguid: ctrl_counterset(%s): argc=%d cmd=%c "
2142 "set=%d uid=%u\n", input, argc, cmd,
2148 if (counter_set < 0 || counter_set >= IFS_MAX_COUNTER_SETS) {
2149 pr_info("qtaguid: ctrl_counterset(%s): invalid counter_set range\n",
2154 if (!can_manipulate_uids()) {
2155 pr_info("qtaguid: ctrl_counterset(%s): "
2156 "insufficient priv from pid=%u tgid=%u uid=%u\n",
2157 input, current->pid, current->tgid, current_fsuid());
2162 tag = make_tag_from_uid(uid);
2163 spin_lock_bh(&tag_counter_set_list_lock);
2164 tcs = tag_counter_set_tree_search(&tag_counter_set_tree, tag);
2166 tcs = kzalloc(sizeof(*tcs), GFP_ATOMIC);
2168 spin_unlock_bh(&tag_counter_set_list_lock);
2169 pr_err("qtaguid: ctrl_counterset(%s): "
2170 "failed to alloc counter set\n",
2176 tag_counter_set_tree_insert(tcs, &tag_counter_set_tree);
2177 CT_DEBUG("qtaguid: ctrl_counterset(%s): added tcs tag=0x%llx "
2178 "(uid=%u) set=%d\n",
2179 input, tag, get_uid_from_tag(tag), counter_set);
2181 tcs->active_set = counter_set;
2182 spin_unlock_bh(&tag_counter_set_list_lock);
2183 atomic64_inc(&qtu_events.counter_set_changes);
2190 static int ctrl_cmd_tag(const char *input)
2195 tag_t acct_tag = make_atag_from_value(0);
2197 struct socket *el_socket;
2199 struct sock_tag *sock_tag_entry;
2200 struct tag_ref *tag_ref_entry;
2201 struct uid_tag_data *uid_tag_data_entry;
2202 struct proc_qtu_data *pqd_entry;
2204 /* Unassigned args will get defaulted later. */
2205 argc = sscanf(input, "%c %d %llu %u", &cmd, &sock_fd, &acct_tag, &uid);
2206 CT_DEBUG("qtaguid: ctrl_tag(%s): argc=%d cmd=%c sock_fd=%d "
2207 "acct_tag=0x%llx uid=%u\n", input, argc, cmd, sock_fd,
2213 el_socket = sockfd_lookup(sock_fd, &res); /* This locks the file */
2215 pr_info("qtaguid: ctrl_tag(%s): failed to lookup"
2216 " sock_fd=%d err=%d pid=%u tgid=%u uid=%u\n",
2217 input, sock_fd, res, current->pid, current->tgid,
2221 CT_DEBUG("qtaguid: ctrl_tag(%s): socket->...->f_count=%ld ->sk=%p\n",
2222 input, atomic_long_read(&el_socket->file->f_count),
2225 acct_tag = make_atag_from_value(0);
2226 } else if (!valid_atag(acct_tag)) {
2227 pr_info("qtaguid: ctrl_tag(%s): invalid tag\n", input);
2231 CT_DEBUG("qtaguid: ctrl_tag(%s): "
2232 "pid=%u tgid=%u uid=%u euid=%u fsuid=%u "
2233 "ctrl.gid=%u in_group()=%d in_egroup()=%d\n",
2234 input, current->pid, current->tgid, current_uid(),
2235 current_euid(), current_fsuid(),
2236 xt_qtaguid_ctrl_file->gid,
2237 in_group_p(xt_qtaguid_ctrl_file->gid),
2238 in_egroup_p(xt_qtaguid_ctrl_file->gid));
2240 uid = current_fsuid();
2241 } else if (!can_impersonate_uid(uid)) {
2242 pr_info("qtaguid: ctrl_tag(%s): "
2243 "insufficient priv from pid=%u tgid=%u uid=%u\n",
2244 input, current->pid, current->tgid, current_fsuid());
2248 full_tag = combine_atag_with_uid(acct_tag, uid);
2250 spin_lock_bh(&sock_tag_list_lock);
2251 sock_tag_entry = get_sock_stat_nl(el_socket->sk);
2252 tag_ref_entry = get_tag_ref(full_tag, &uid_tag_data_entry);
2253 if (IS_ERR(tag_ref_entry)) {
2254 res = PTR_ERR(tag_ref_entry);
2255 spin_unlock_bh(&sock_tag_list_lock);
2258 tag_ref_entry->num_sock_tags++;
2259 if (sock_tag_entry) {
2260 struct tag_ref *prev_tag_ref_entry;
2262 CT_DEBUG("qtaguid: ctrl_tag(%s): retag for sk=%p "
2263 "st@%p ...->f_count=%ld\n",
2264 input, el_socket->sk, sock_tag_entry,
2265 atomic_long_read(&el_socket->file->f_count));
2267 * This is a re-tagging, so release the sock_fd that was
2268 * locked at the time of the 1st tagging.
2269 * There is still the ref from this call's sockfd_lookup() so
2270 * it can be done within the spinlock.
2272 sockfd_put(sock_tag_entry->socket);
2273 prev_tag_ref_entry = lookup_tag_ref(sock_tag_entry->tag,
2274 &uid_tag_data_entry);
2275 BUG_ON(IS_ERR_OR_NULL(prev_tag_ref_entry));
2276 BUG_ON(prev_tag_ref_entry->num_sock_tags <= 0);
2277 prev_tag_ref_entry->num_sock_tags--;
2278 sock_tag_entry->tag = full_tag;
2280 CT_DEBUG("qtaguid: ctrl_tag(%s): newtag for sk=%p\n",
2281 input, el_socket->sk);
2282 sock_tag_entry = kzalloc(sizeof(*sock_tag_entry),
2284 if (!sock_tag_entry) {
2285 pr_err("qtaguid: ctrl_tag(%s): "
2286 "socket tag alloc failed\n",
2288 spin_unlock_bh(&sock_tag_list_lock);
2290 goto err_tag_unref_put;
2292 sock_tag_entry->sk = el_socket->sk;
2293 sock_tag_entry->socket = el_socket;
2294 sock_tag_entry->pid = current->tgid;
2295 sock_tag_entry->tag = combine_atag_with_uid(acct_tag,
2297 spin_lock_bh(&uid_tag_data_tree_lock);
2298 pqd_entry = proc_qtu_data_tree_search(
2299 &proc_qtu_data_tree, current->tgid);
2301 * TODO: remove if, and start failing.
2302 * At first, we want to catch user-space code that is not
2303 * opening the /dev/xt_qtaguid.
2305 if (IS_ERR_OR_NULL(pqd_entry))
2308 "User space forgot to open /dev/xt_qtaguid? "
2309 "pid=%u tgid=%u uid=%u\n", __func__,
2310 current->pid, current->tgid,
2313 list_add(&sock_tag_entry->list,
2314 &pqd_entry->sock_tag_list);
2315 spin_unlock_bh(&uid_tag_data_tree_lock);
2317 sock_tag_tree_insert(sock_tag_entry, &sock_tag_tree);
2318 atomic64_inc(&qtu_events.sockets_tagged);
2320 spin_unlock_bh(&sock_tag_list_lock);
2321 /* We keep the ref to the socket (file) until it is untagged */
2322 CT_DEBUG("qtaguid: ctrl_tag(%s): done st@%p ...->f_count=%ld\n",
2323 input, sock_tag_entry,
2324 atomic_long_read(&el_socket->file->f_count));
2328 BUG_ON(tag_ref_entry->num_sock_tags <= 0);
2329 tag_ref_entry->num_sock_tags--;
2330 free_tag_ref_from_utd_entry(tag_ref_entry, uid_tag_data_entry);
2332 CT_DEBUG("qtaguid: ctrl_tag(%s): done. ...->f_count=%ld\n",
2333 input, atomic_long_read(&el_socket->file->f_count) - 1);
2334 /* Release the sock_fd that was grabbed by sockfd_lookup(). */
2335 sockfd_put(el_socket);
2339 CT_DEBUG("qtaguid: ctrl_tag(%s): done.\n", input);
2343 static int ctrl_cmd_untag(const char *input)
2347 struct socket *el_socket;
2349 struct sock_tag *sock_tag_entry;
2350 struct tag_ref *tag_ref_entry;
2351 struct uid_tag_data *utd_entry;
2352 struct proc_qtu_data *pqd_entry;
2354 argc = sscanf(input, "%c %d", &cmd, &sock_fd);
2355 CT_DEBUG("qtaguid: ctrl_untag(%s): argc=%d cmd=%c sock_fd=%d\n",
2356 input, argc, cmd, sock_fd);
2361 el_socket = sockfd_lookup(sock_fd, &res); /* This locks the file */
2363 pr_info("qtaguid: ctrl_untag(%s): failed to lookup"
2364 " sock_fd=%d err=%d pid=%u tgid=%u uid=%u\n",
2365 input, sock_fd, res, current->pid, current->tgid,
2369 CT_DEBUG("qtaguid: ctrl_untag(%s): socket->...->f_count=%ld ->sk=%p\n",
2370 input, atomic_long_read(&el_socket->file->f_count),
2372 spin_lock_bh(&sock_tag_list_lock);
2373 sock_tag_entry = get_sock_stat_nl(el_socket->sk);
2374 if (!sock_tag_entry) {
2375 spin_unlock_bh(&sock_tag_list_lock);
2380 * The socket already belongs to the current process
2381 * so it can do whatever it wants to it.
2383 rb_erase(&sock_tag_entry->sock_node, &sock_tag_tree);
2385 tag_ref_entry = lookup_tag_ref(sock_tag_entry->tag, &utd_entry);
2386 BUG_ON(!tag_ref_entry);
2387 BUG_ON(tag_ref_entry->num_sock_tags <= 0);
2388 spin_lock_bh(&uid_tag_data_tree_lock);
2389 pqd_entry = proc_qtu_data_tree_search(
2390 &proc_qtu_data_tree, current->tgid);
2392 * TODO: remove if, and start failing.
2393 * At first, we want to catch user-space code that is not
2394 * opening the /dev/xt_qtaguid.
2396 if (IS_ERR_OR_NULL(pqd_entry))
2397 pr_warn_once("qtaguid: %s(): "
2398 "User space forgot to open /dev/xt_qtaguid? "
2399 "pid=%u tgid=%u uid=%u\n", __func__,
2400 current->pid, current->tgid, current_fsuid());
2402 list_del(&sock_tag_entry->list);
2403 spin_unlock_bh(&uid_tag_data_tree_lock);
2405 * We don't free tag_ref from the utd_entry here,
2406 * only during a cmd_delete().
2408 tag_ref_entry->num_sock_tags--;
2409 spin_unlock_bh(&sock_tag_list_lock);
2411 * Release the sock_fd that was grabbed at tag time,
2412 * and once more for the sockfd_lookup() here.
2414 sockfd_put(sock_tag_entry->socket);
2415 CT_DEBUG("qtaguid: ctrl_untag(%s): done. st@%p ...->f_count=%ld\n",
2416 input, sock_tag_entry,
2417 atomic_long_read(&el_socket->file->f_count) - 1);
2418 sockfd_put(el_socket);
2420 kfree(sock_tag_entry);
2421 atomic64_inc(&qtu_events.sockets_untagged);
2426 CT_DEBUG("qtaguid: ctrl_untag(%s): done. socket->...->f_count=%ld\n",
2427 input, atomic_long_read(&el_socket->file->f_count) - 1);
2428 /* Release the sock_fd that was grabbed by sockfd_lookup(). */
2429 sockfd_put(el_socket);
2433 CT_DEBUG("qtaguid: ctrl_untag(%s): done.\n", input);
2437 static int qtaguid_ctrl_parse(const char *input, int count)
2442 CT_DEBUG("qtaguid: ctrl(%s): pid=%u tgid=%u uid=%u\n",
2443 input, current->pid, current->tgid, current_fsuid());
2446 /* Collect params for commands */
2449 res = ctrl_cmd_delete(input);
2453 res = ctrl_cmd_counter_set(input);
2457 res = ctrl_cmd_tag(input);
2461 res = ctrl_cmd_untag(input);
2471 CT_DEBUG("qtaguid: ctrl(%s): res=%d\n", input, res);
2475 #define MAX_QTAGUID_CTRL_INPUT_LEN 255
2476 static int qtaguid_ctrl_proc_write(struct file *file, const char __user *buffer,
2477 size_t count, loff_t *offp)
2479 char input_buf[MAX_QTAGUID_CTRL_INPUT_LEN];
2481 if (unlikely(module_passive))
2484 if (count >= MAX_QTAGUID_CTRL_INPUT_LEN)
2487 if (copy_from_user(input_buf, buffer, count))
2490 input_buf[count] = '\0';
2491 return qtaguid_ctrl_parse(input_buf, count);
2494 struct proc_print_info {
2495 struct iface_stat *iface_entry;
2497 tag_t tag; /* tag found by reading to tag_pos */
2502 static void pp_stats_header(struct seq_file *m)
2505 "idx iface acct_tag_hex uid_tag_int cnt_set "
2506 "rx_bytes rx_packets "
2507 "tx_bytes tx_packets "
2508 "rx_tcp_bytes rx_tcp_packets "
2509 "rx_udp_bytes rx_udp_packets "
2510 "rx_other_bytes rx_other_packets "
2511 "tx_tcp_bytes tx_tcp_packets "
2512 "tx_udp_bytes tx_udp_packets "
2513 "tx_other_bytes tx_other_packets\n");
2516 static int pp_stats_line(struct seq_file *m, struct tag_stat *ts_entry,
2520 struct data_counters *cnts;
2521 tag_t tag = ts_entry->tn.tag;
2522 uid_t stat_uid = get_uid_from_tag(tag);
2523 struct proc_print_info *ppi = m->private;
2524 /* Detailed tags are not available to everybody */
2525 if (get_atag_from_tag(tag) && !can_read_other_uid_stats(stat_uid)) {
2526 CT_DEBUG("qtaguid: stats line: "
2527 "%s 0x%llx %u: insufficient priv "
2528 "from pid=%u tgid=%u uid=%u stats.gid=%u\n",
2529 ppi->iface_entry->ifname,
2530 get_atag_from_tag(tag), stat_uid,
2531 current->pid, current->tgid, current_fsuid(),
2532 xt_qtaguid_stats_file->gid);
2536 cnts = &ts_entry->counters;
2537 ret = seq_printf(m, "%d %s 0x%llx %u %u "
2547 ppi->iface_entry->ifname,
2548 get_atag_from_tag(tag),
2551 dc_sum_bytes(cnts, cnt_set, IFS_RX),
2552 dc_sum_packets(cnts, cnt_set, IFS_RX),
2553 dc_sum_bytes(cnts, cnt_set, IFS_TX),
2554 dc_sum_packets(cnts, cnt_set, IFS_TX),
2555 cnts->bpc[cnt_set][IFS_RX][IFS_TCP].bytes,
2556 cnts->bpc[cnt_set][IFS_RX][IFS_TCP].packets,
2557 cnts->bpc[cnt_set][IFS_RX][IFS_UDP].bytes,
2558 cnts->bpc[cnt_set][IFS_RX][IFS_UDP].packets,
2559 cnts->bpc[cnt_set][IFS_RX][IFS_PROTO_OTHER].bytes,
2560 cnts->bpc[cnt_set][IFS_RX][IFS_PROTO_OTHER].packets,
2561 cnts->bpc[cnt_set][IFS_TX][IFS_TCP].bytes,
2562 cnts->bpc[cnt_set][IFS_TX][IFS_TCP].packets,
2563 cnts->bpc[cnt_set][IFS_TX][IFS_UDP].bytes,
2564 cnts->bpc[cnt_set][IFS_TX][IFS_UDP].packets,
2565 cnts->bpc[cnt_set][IFS_TX][IFS_PROTO_OTHER].bytes,
2566 cnts->bpc[cnt_set][IFS_TX][IFS_PROTO_OTHER].packets);
2570 static bool pp_sets(struct seq_file *m, struct tag_stat *ts_entry)
2574 for (counter_set = 0; counter_set < IFS_MAX_COUNTER_SETS;
2576 ret = pp_stats_line(m, ts_entry, counter_set);
2583 static int qtaguid_stats_proc_iface_stat_ptr_valid(struct iface_stat *ptr)
2585 struct iface_stat *iface_entry;
2590 list_for_each_entry(iface_entry, &iface_stat_list, list)
2591 if (iface_entry == ptr)
2596 static void qtaguid_stats_proc_next_iface_entry(struct proc_print_info *ppi)
2598 spin_unlock_bh(&ppi->iface_entry->tag_stat_list_lock);
2599 list_for_each_entry_continue(ppi->iface_entry, &iface_stat_list, list) {
2600 spin_lock_bh(&ppi->iface_entry->tag_stat_list_lock);
2603 ppi->iface_entry = NULL;
2606 static void *qtaguid_stats_proc_next(struct seq_file *m, void *v, loff_t *pos)
2608 struct proc_print_info *ppi = m->private;
2609 struct tag_stat *ts_entry;
2610 struct rb_node *node;
2613 pr_err("qtaguid: %s(): unexpected v: NULL\n", __func__);
2619 if (!ppi->iface_entry || unlikely(module_passive))
2622 if (v == SEQ_START_TOKEN)
2623 node = rb_first(&ppi->iface_entry->tag_stat_tree);
2625 node = rb_next(&((struct tag_stat *)v)->tn.node);
2628 qtaguid_stats_proc_next_iface_entry(ppi);
2629 if (!ppi->iface_entry)
2631 node = rb_first(&ppi->iface_entry->tag_stat_tree);
2634 ts_entry = rb_entry(node, struct tag_stat, tn.node);
2635 ppi->tag = ts_entry->tn.tag;
2636 ppi->tag_pos = *pos;
2637 ppi->tag_item_index = ppi->item_index;
2641 static void *qtaguid_stats_proc_start(struct seq_file *m, loff_t *pos)
2643 struct proc_print_info *ppi = m->private;
2644 struct tag_stat *ts_entry = NULL;
2646 spin_lock_bh(&iface_stat_list_lock);
2649 ppi->item_index = 1;
2651 if (list_empty(&iface_stat_list)) {
2652 ppi->iface_entry = NULL;
2654 ppi->iface_entry = list_first_entry(&iface_stat_list,
2657 spin_lock_bh(&ppi->iface_entry->tag_stat_list_lock);
2659 return SEQ_START_TOKEN;
2661 if (!qtaguid_stats_proc_iface_stat_ptr_valid(ppi->iface_entry)) {
2662 if (ppi->iface_entry) {
2663 pr_err("qtaguid: %s(): iface_entry %p not found\n",
2664 __func__, ppi->iface_entry);
2665 ppi->iface_entry = NULL;
2670 spin_lock_bh(&ppi->iface_entry->tag_stat_list_lock);
2672 if (!ppi->tag_pos) {
2673 /* seq_read skipped first next call */
2674 ts_entry = SEQ_START_TOKEN;
2676 ts_entry = tag_stat_tree_search(
2677 &ppi->iface_entry->tag_stat_tree, ppi->tag);
2679 pr_info("qtaguid: %s(): tag_stat.tag 0x%llx not found. Abort.\n",
2680 __func__, ppi->tag);
2685 if (*pos == ppi->tag_pos) { /* normal resume */
2686 ppi->item_index = ppi->tag_item_index;
2688 /* seq_read skipped a next call */
2689 *pos = ppi->tag_pos;
2690 ts_entry = qtaguid_stats_proc_next(m, ts_entry, pos);
2696 static void qtaguid_stats_proc_stop(struct seq_file *m, void *v)
2698 struct proc_print_info *ppi = m->private;
2699 if (ppi->iface_entry)
2700 spin_unlock_bh(&ppi->iface_entry->tag_stat_list_lock);
2701 spin_unlock_bh(&iface_stat_list_lock);
2705 * Procfs reader to get all tag stats using style "1)" as described in
2707 * Groups all protocols tx/rx bytes.
2709 static int qtaguid_stats_proc_show(struct seq_file *m, void *v)
2711 struct tag_stat *ts_entry = v;
2713 if (v == SEQ_START_TOKEN)
2716 pp_sets(m, ts_entry);
2721 /*------------------------------------------*/
2722 static int qtudev_open(struct inode *inode, struct file *file)
2724 struct uid_tag_data *utd_entry;
2725 struct proc_qtu_data *pqd_entry;
2726 struct proc_qtu_data *new_pqd_entry;
2728 bool utd_entry_found;
2730 if (unlikely(qtu_proc_handling_passive))
2733 DR_DEBUG("qtaguid: qtudev_open(): pid=%u tgid=%u uid=%u\n",
2734 current->pid, current->tgid, current_fsuid());
2736 spin_lock_bh(&uid_tag_data_tree_lock);
2738 /* Look for existing uid data, or alloc one. */
2739 utd_entry = get_uid_data(current_fsuid(), &utd_entry_found);
2740 if (IS_ERR_OR_NULL(utd_entry)) {
2741 res = PTR_ERR(utd_entry);
2745 /* Look for existing PID based proc_data */
2746 pqd_entry = proc_qtu_data_tree_search(&proc_qtu_data_tree,
2749 pr_err("qtaguid: qtudev_open(): %u/%u %u "
2750 "%s already opened\n",
2751 current->pid, current->tgid, current_fsuid(),
2754 goto err_unlock_free_utd;
2757 new_pqd_entry = kzalloc(sizeof(*new_pqd_entry), GFP_ATOMIC);
2758 if (!new_pqd_entry) {
2759 pr_err("qtaguid: qtudev_open(): %u/%u %u: "
2760 "proc data alloc failed\n",
2761 current->pid, current->tgid, current_fsuid());
2763 goto err_unlock_free_utd;
2765 new_pqd_entry->pid = current->tgid;
2766 INIT_LIST_HEAD(&new_pqd_entry->sock_tag_list);
2767 new_pqd_entry->parent_tag_data = utd_entry;
2768 utd_entry->num_pqd++;
2770 proc_qtu_data_tree_insert(new_pqd_entry,
2771 &proc_qtu_data_tree);
2773 spin_unlock_bh(&uid_tag_data_tree_lock);
2774 DR_DEBUG("qtaguid: tracking data for uid=%u in pqd=%p\n",
2775 current_fsuid(), new_pqd_entry);
2776 file->private_data = new_pqd_entry;
2779 err_unlock_free_utd:
2780 if (!utd_entry_found) {
2781 rb_erase(&utd_entry->node, &uid_tag_data_tree);
2785 spin_unlock_bh(&uid_tag_data_tree_lock);
2789 static int qtudev_release(struct inode *inode, struct file *file)
2791 struct proc_qtu_data *pqd_entry = file->private_data;
2792 struct uid_tag_data *utd_entry = pqd_entry->parent_tag_data;
2793 struct sock_tag *st_entry;
2794 struct rb_root st_to_free_tree = RB_ROOT;
2795 struct list_head *entry, *next;
2798 if (unlikely(qtu_proc_handling_passive))
2802 * Do not trust the current->pid, it might just be a kworker cleaning
2803 * up after a dead proc.
2805 DR_DEBUG("qtaguid: qtudev_release(): "
2806 "pid=%u tgid=%u uid=%u "
2807 "pqd_entry=%p->pid=%u utd_entry=%p->active_tags=%d\n",
2808 current->pid, current->tgid, pqd_entry->parent_tag_data->uid,
2809 pqd_entry, pqd_entry->pid, utd_entry,
2810 utd_entry->num_active_tags);
2812 spin_lock_bh(&sock_tag_list_lock);
2813 spin_lock_bh(&uid_tag_data_tree_lock);
2815 list_for_each_safe(entry, next, &pqd_entry->sock_tag_list) {
2816 st_entry = list_entry(entry, struct sock_tag, list);
2817 DR_DEBUG("qtaguid: %s(): "
2818 "erase sock_tag=%p->sk=%p pid=%u tgid=%u uid=%u\n",
2820 st_entry, st_entry->sk,
2821 current->pid, current->tgid,
2822 pqd_entry->parent_tag_data->uid);
2824 utd_entry = uid_tag_data_tree_search(
2826 get_uid_from_tag(st_entry->tag));
2827 BUG_ON(IS_ERR_OR_NULL(utd_entry));
2828 DR_DEBUG("qtaguid: %s(): "
2829 "looking for tag=0x%llx in utd_entry=%p\n", __func__,
2830 st_entry->tag, utd_entry);
2831 tr = tag_ref_tree_search(&utd_entry->tag_ref_tree,
2834 BUG_ON(tr->num_sock_tags <= 0);
2835 tr->num_sock_tags--;
2836 free_tag_ref_from_utd_entry(tr, utd_entry);
2838 rb_erase(&st_entry->sock_node, &sock_tag_tree);
2839 list_del(&st_entry->list);
2840 /* Can't sockfd_put() within spinlock, do it later. */
2841 sock_tag_tree_insert(st_entry, &st_to_free_tree);
2844 * Try to free the utd_entry if no other proc_qtu_data is
2845 * using it (num_pqd is 0) and it doesn't have active tags
2846 * (num_active_tags is 0).
2848 put_utd_entry(utd_entry);
2851 rb_erase(&pqd_entry->node, &proc_qtu_data_tree);
2852 BUG_ON(pqd_entry->parent_tag_data->num_pqd < 1);
2853 pqd_entry->parent_tag_data->num_pqd--;
2854 put_utd_entry(pqd_entry->parent_tag_data);
2856 file->private_data = NULL;
2858 spin_unlock_bh(&uid_tag_data_tree_lock);
2859 spin_unlock_bh(&sock_tag_list_lock);
2862 sock_tag_tree_erase(&st_to_free_tree);
2864 prdebug_full_state(0, "%s(): pid=%u tgid=%u", __func__,
2865 current->pid, current->tgid);
2869 /*------------------------------------------*/
2870 static const struct file_operations qtudev_fops = {
2871 .owner = THIS_MODULE,
2872 .open = qtudev_open,
2873 .release = qtudev_release,
2876 static struct miscdevice qtu_device = {
2877 .minor = MISC_DYNAMIC_MINOR,
2878 .name = QTU_DEV_NAME,
2879 .fops = &qtudev_fops,
2880 /* How sad it doesn't allow for defaults: .mode = S_IRUGO | S_IWUSR */
2883 static const struct seq_operations proc_qtaguid_ctrl_seqops = {
2884 .start = qtaguid_ctrl_proc_start,
2885 .next = qtaguid_ctrl_proc_next,
2886 .stop = qtaguid_ctrl_proc_stop,
2887 .show = qtaguid_ctrl_proc_show,
2890 static int proc_qtaguid_ctrl_open(struct inode *inode, struct file *file)
2892 return seq_open_private(file, &proc_qtaguid_ctrl_seqops,
2893 sizeof(struct proc_ctrl_print_info));
2896 static const struct file_operations proc_qtaguid_ctrl_fops = {
2897 .open = proc_qtaguid_ctrl_open,
2899 .write = qtaguid_ctrl_proc_write,
2900 .llseek = seq_lseek,
2901 .release = seq_release,
2904 static const struct seq_operations proc_qtaguid_stats_seqops = {
2905 .start = qtaguid_stats_proc_start,
2906 .next = qtaguid_stats_proc_next,
2907 .stop = qtaguid_stats_proc_stop,
2908 .show = qtaguid_stats_proc_show,
2911 static int proc_qtaguid_stats_open(struct inode *inode, struct file *file)
2913 return seq_open_private(file, &proc_qtaguid_stats_seqops,
2914 sizeof(struct proc_print_info));
2917 static const struct file_operations proc_qtaguid_stats_fops = {
2918 .open = proc_qtaguid_stats_open,
2920 .llseek = seq_lseek,
2921 .release = seq_release_private,
2924 /*------------------------------------------*/
2925 static int __init qtaguid_proc_register(struct proc_dir_entry **res_procdir)
2928 *res_procdir = proc_mkdir(module_procdirname, init_net.proc_net);
2929 if (!*res_procdir) {
2930 pr_err("qtaguid: failed to create proc/.../xt_qtaguid\n");
2935 xt_qtaguid_ctrl_file = proc_create_data("ctrl", proc_ctrl_perms,
2937 &proc_qtaguid_ctrl_fops,
2939 if (!xt_qtaguid_ctrl_file) {
2940 pr_err("qtaguid: failed to create xt_qtaguid/ctrl "
2946 xt_qtaguid_stats_file = proc_create_data("stats", proc_stats_perms,
2948 &proc_qtaguid_stats_fops,
2950 if (!xt_qtaguid_stats_file) {
2951 pr_err("qtaguid: failed to create xt_qtaguid/stats "
2954 goto no_stats_entry;
2957 * TODO: add support counter hacking
2958 * xt_qtaguid_stats_file->write_proc = qtaguid_stats_proc_write;
2963 remove_proc_entry("ctrl", *res_procdir);
2965 remove_proc_entry("xt_qtaguid", NULL);
2970 static struct xt_match qtaguid_mt_reg __read_mostly = {
2972 * This module masquerades as the "owner" module so that iptables
2973 * tools can deal with it.
2977 .family = NFPROTO_UNSPEC,
2978 .match = qtaguid_mt,
2979 .matchsize = sizeof(struct xt_qtaguid_match_info),
2983 static int __init qtaguid_mt_init(void)
2985 if (qtaguid_proc_register(&xt_qtaguid_procdir)
2986 || iface_stat_init(xt_qtaguid_procdir)
2987 || xt_register_match(&qtaguid_mt_reg)
2988 || misc_register(&qtu_device))
2994 * TODO: allow unloading of the module.
2995 * For now stats are permanent.
2996 * Kconfig forces'y/n' and never an 'm'.
2999 module_init(qtaguid_mt_init);
3000 MODULE_AUTHOR("jpa <jpa@google.com>");
3001 MODULE_DESCRIPTION("Xtables: socket owner+tag matching and associated stats");
3002 MODULE_LICENSE("GPL");
3003 MODULE_ALIAS("ipt_owner");
3004 MODULE_ALIAS("ip6t_owner");
3005 MODULE_ALIAS("ipt_qtaguid");
3006 MODULE_ALIAS("ip6t_qtaguid");