| /* |
| * Kernel iptables module to track stats for packets based on user tags. |
| * |
| * (C) 2011 Google, Inc |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| /* |
| * There are run-time debug flags enabled via the debug_mask module param, or |
| * via the DEFAULT_DEBUG_MASK. See xt_qtaguid_internal.h. |
| */ |
| #define DEBUG |
| |
| #include <linux/file.h> |
| #include <linux/inetdevice.h> |
| #include <linux/module.h> |
| #include <linux/netfilter/x_tables.h> |
| #include <linux/netfilter/xt_qtaguid.h> |
| #include <linux/skbuff.h> |
| #include <linux/workqueue.h> |
| #include <net/addrconf.h> |
| #include <net/sock.h> |
| #include <net/tcp.h> |
| #include <net/udp.h> |
| |
| #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
| #include <linux/netfilter_ipv6/ip6_tables.h> |
| #endif |
| |
| #include <linux/netfilter/xt_socket.h> |
| #include "xt_qtaguid_internal.h" |
| #include "xt_qtaguid_print.h" |
| |
| /* |
| * We only use the xt_socket funcs within a similar context to avoid unexpected |
| * return values. |
| */ |
| #define XT_SOCKET_SUPPORTED_HOOKS \ |
| ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_IN)) |
| |
| |
| static const char *module_procdirname = "xt_qtaguid"; |
| static struct proc_dir_entry *xt_qtaguid_procdir; |
| |
| static unsigned int proc_iface_perms = S_IRUGO; |
| module_param_named(iface_perms, proc_iface_perms, uint, S_IRUGO | S_IWUSR); |
| |
| static struct proc_dir_entry *xt_qtaguid_stats_file; |
| static unsigned int proc_stats_perms = S_IRUGO; |
| module_param_named(stats_perms, proc_stats_perms, uint, S_IRUGO | S_IWUSR); |
| |
| static struct proc_dir_entry *xt_qtaguid_ctrl_file; |
| #ifdef CONFIG_ANDROID_PARANOID_NETWORK |
| static unsigned int proc_ctrl_perms = S_IRUGO | S_IWUGO; |
| #else |
| static unsigned int proc_ctrl_perms = S_IRUGO | S_IWUSR; |
| #endif |
| module_param_named(ctrl_perms, proc_ctrl_perms, uint, S_IRUGO | S_IWUSR); |
| |
| #ifdef CONFIG_ANDROID_PARANOID_NETWORK |
| #include <linux/android_aid.h> |
| static gid_t proc_stats_readall_gid = AID_NET_BW_STATS; |
| static gid_t proc_ctrl_write_gid = AID_NET_BW_ACCT; |
| #else |
| /* 0 means, don't limit anybody */ |
| static gid_t proc_stats_readall_gid; |
| static gid_t proc_ctrl_write_gid; |
| #endif |
| module_param_named(stats_readall_gid, proc_stats_readall_gid, uint, |
| S_IRUGO | S_IWUSR); |
| module_param_named(ctrl_write_gid, proc_ctrl_write_gid, uint, |
| S_IRUGO | S_IWUSR); |
| |
| /* |
| * Limit the number of active tags (via socket tags) for a given UID. |
| * Multiple processes could share the UID. |
| */ |
| static int max_sock_tags = DEFAULT_MAX_SOCK_TAGS; |
| module_param(max_sock_tags, int, S_IRUGO | S_IWUSR); |
| |
| /* |
| * After the kernel has initiallized this module, it is still possible |
| * to make it passive. |
| * Setting passive to Y: |
| * - the iface stats handling will not act on notifications. |
| * - iptables matches will never match. |
| * - ctrl commands silently succeed. |
| * - stats are always empty. |
| * This is mostly usefull when a bug is suspected. |
| */ |
| static bool module_passive; |
| module_param_named(passive, module_passive, bool, S_IRUGO | S_IWUSR); |
| |
| /* |
| * Control how qtaguid data is tracked per proc/uid. |
| * Setting tag_tracking_passive to Y: |
| * - don't create proc specific structs to track tags |
| * - don't check that active tag stats exceed some limits. |
| * - don't clean up socket tags on process exits. |
| * This is mostly usefull when a bug is suspected. |
| */ |
| static bool qtu_proc_handling_passive; |
| module_param_named(tag_tracking_passive, qtu_proc_handling_passive, bool, |
| S_IRUGO | S_IWUSR); |
| |
| #define QTU_DEV_NAME "xt_qtaguid" |
| |
| uint qtaguid_debug_mask = DEFAULT_DEBUG_MASK; |
| module_param_named(debug_mask, qtaguid_debug_mask, uint, S_IRUGO | S_IWUSR); |
| |
| /*---------------------------------------------------------------------------*/ |
| static const char *iface_stat_procdirname = "iface_stat"; |
| static struct proc_dir_entry *iface_stat_procdir; |
| /* |
| * The iface_stat_all* will go away once userspace gets use to the new fields |
| * that have a format line. |
| */ |
| static const char *iface_stat_all_procfilename = "iface_stat_all"; |
| static struct proc_dir_entry *iface_stat_all_procfile; |
| static const char *iface_stat_fmt_procfilename = "iface_stat_fmt"; |
| static struct proc_dir_entry *iface_stat_fmt_procfile; |
| |
| |
| /* |
| * Ordering of locks: |
| * outer locks: |
| * iface_stat_list_lock |
| * sock_tag_list_lock |
| * inner locks: |
| * uid_tag_data_tree_lock |
| * tag_counter_set_list_lock |
| * Notice how sock_tag_list_lock is held sometimes when uid_tag_data_tree_lock |
| * is acquired. |
| * |
| * Call tree with all lock holders as of 2012-04-27: |
| * |
| * iface_stat_fmt_proc_read() |
| * iface_stat_list_lock |
| * (struct iface_stat) |
| * |
| * qtaguid_ctrl_proc_read() |
| * sock_tag_list_lock |
| * (sock_tag_tree) |
| * (struct proc_qtu_data->sock_tag_list) |
| * prdebug_full_state() |
| * sock_tag_list_lock |
| * (sock_tag_tree) |
| * uid_tag_data_tree_lock |
| * (uid_tag_data_tree) |
| * (proc_qtu_data_tree) |
| * iface_stat_list_lock |
| * |
| * qtaguid_stats_proc_read() |
| * iface_stat_list_lock |
| * struct iface_stat->tag_stat_list_lock |
| * |
| * qtudev_open() |
| * uid_tag_data_tree_lock |
| * |
| * qtudev_release() |
| * sock_tag_data_list_lock |
| * uid_tag_data_tree_lock |
| * prdebug_full_state() |
| * sock_tag_list_lock |
| * uid_tag_data_tree_lock |
| * iface_stat_list_lock |
| * |
| * iface_netdev_event_handler() |
| * iface_stat_create() |
| * iface_stat_list_lock |
| * iface_stat_update() |
| * iface_stat_list_lock |
| * |
| * iface_inetaddr_event_handler() |
| * iface_stat_create() |
| * iface_stat_list_lock |
| * iface_stat_update() |
| * iface_stat_list_lock |
| * |
| * iface_inet6addr_event_handler() |
| * iface_stat_create_ipv6() |
| * iface_stat_list_lock |
| * iface_stat_update() |
| * iface_stat_list_lock |
| * |
| * qtaguid_mt() |
| * account_for_uid() |
| * if_tag_stat_update() |
| * get_sock_stat() |
| * sock_tag_list_lock |
| * struct iface_stat->tag_stat_list_lock |
| * tag_stat_update() |
| * get_active_counter_set() |
| * tag_counter_set_list_lock |
| * tag_stat_update() |
| * get_active_counter_set() |
| * tag_counter_set_list_lock |
| * |
| * |
| * qtaguid_ctrl_parse() |
| * ctrl_cmd_delete() |
| * sock_tag_list_lock |
| * tag_counter_set_list_lock |
| * iface_stat_list_lock |
| * struct iface_stat->tag_stat_list_lock |
| * uid_tag_data_tree_lock |
| * ctrl_cmd_counter_set() |
| * tag_counter_set_list_lock |
| * ctrl_cmd_tag() |
| * sock_tag_list_lock |
| * (sock_tag_tree) |
| * get_tag_ref() |
| * uid_tag_data_tree_lock |
| * (uid_tag_data_tree) |
| * uid_tag_data_tree_lock |
| * (proc_qtu_data_tree) |
| * ctrl_cmd_untag() |
| * sock_tag_list_lock |
| * uid_tag_data_tree_lock |
| * |
| */ |
| static LIST_HEAD(iface_stat_list); |
| static DEFINE_SPINLOCK(iface_stat_list_lock); |
| |
| static struct rb_root sock_tag_tree = RB_ROOT; |
| static DEFINE_SPINLOCK(sock_tag_list_lock); |
| |
| static struct rb_root tag_counter_set_tree = RB_ROOT; |
| static DEFINE_SPINLOCK(tag_counter_set_list_lock); |
| |
| static struct rb_root uid_tag_data_tree = RB_ROOT; |
| static DEFINE_SPINLOCK(uid_tag_data_tree_lock); |
| |
| static struct rb_root proc_qtu_data_tree = RB_ROOT; |
| /* No proc_qtu_data_tree_lock; use uid_tag_data_tree_lock */ |
| |
| static struct qtaguid_event_counts qtu_events; |
| /*----------------------------------------------*/ |
| static bool can_manipulate_uids(void) |
| { |
| /* root pwnd */ |
| return unlikely(!current_fsuid()) || unlikely(!proc_ctrl_write_gid) |
| || in_egroup_p(proc_ctrl_write_gid); |
| } |
| |
| static bool can_impersonate_uid(uid_t uid) |
| { |
| return uid == current_fsuid() || can_manipulate_uids(); |
| } |
| |
| static bool can_read_other_uid_stats(uid_t uid) |
| { |
| /* root pwnd */ |
| return unlikely(!current_fsuid()) || uid == current_fsuid() |
| || unlikely(!proc_stats_readall_gid) |
| || in_egroup_p(proc_stats_readall_gid); |
| } |
| |
| static inline void dc_add_byte_packets(struct data_counters *counters, int set, |
| enum ifs_tx_rx direction, |
| enum ifs_proto ifs_proto, |
| int bytes, |
| int packets) |
| { |
| counters->bpc[set][direction][ifs_proto].bytes += bytes; |
| counters->bpc[set][direction][ifs_proto].packets += packets; |
| } |
| |
| static inline uint64_t dc_sum_bytes(struct data_counters *counters, |
| int set, |
| enum ifs_tx_rx direction) |
| { |
| return counters->bpc[set][direction][IFS_TCP].bytes |
| + counters->bpc[set][direction][IFS_UDP].bytes |
| + counters->bpc[set][direction][IFS_PROTO_OTHER].bytes; |
| } |
| |
| static inline uint64_t dc_sum_packets(struct data_counters *counters, |
| int set, |
| enum ifs_tx_rx direction) |
| { |
| return counters->bpc[set][direction][IFS_TCP].packets |
| + counters->bpc[set][direction][IFS_UDP].packets |
| + counters->bpc[set][direction][IFS_PROTO_OTHER].packets; |
| } |
| |
| static struct tag_node *tag_node_tree_search(struct rb_root *root, tag_t tag) |
| { |
| struct rb_node *node = root->rb_node; |
| |
| while (node) { |
| struct tag_node *data = rb_entry(node, struct tag_node, node); |
| int result; |
| RB_DEBUG("qtaguid: tag_node_tree_search(0x%llx): " |
| " node=%p data=%p\n", tag, node, data); |
| result = tag_compare(tag, data->tag); |
| RB_DEBUG("qtaguid: tag_node_tree_search(0x%llx): " |
| " data.tag=0x%llx (uid=%u) res=%d\n", |
| tag, data->tag, get_uid_from_tag(data->tag), result); |
| if (result < 0) |
| node = node->rb_left; |
| else if (result > 0) |
| node = node->rb_right; |
| else |
| return data; |
| } |
| return NULL; |
| } |
| |
| static void tag_node_tree_insert(struct tag_node *data, struct rb_root *root) |
| { |
| struct rb_node **new = &(root->rb_node), *parent = NULL; |
| |
| /* Figure out where to put new node */ |
| while (*new) { |
| struct tag_node *this = rb_entry(*new, struct tag_node, |
| node); |
| int result = tag_compare(data->tag, this->tag); |
| RB_DEBUG("qtaguid: %s(): tag=0x%llx" |
| " (uid=%u)\n", __func__, |
| this->tag, |
| get_uid_from_tag(this->tag)); |
| parent = *new; |
| if (result < 0) |
| new = &((*new)->rb_left); |
| else if (result > 0) |
| new = &((*new)->rb_right); |
| else |
| BUG(); |
| } |
| |
| /* Add new node and rebalance tree. */ |
| rb_link_node(&data->node, parent, new); |
| rb_insert_color(&data->node, root); |
| } |
| |
| static void tag_stat_tree_insert(struct tag_stat *data, struct rb_root *root) |
| { |
| tag_node_tree_insert(&data->tn, root); |
| } |
| |
| static struct tag_stat *tag_stat_tree_search(struct rb_root *root, tag_t tag) |
| { |
| struct tag_node *node = tag_node_tree_search(root, tag); |
| if (!node) |
| return NULL; |
| return rb_entry(&node->node, struct tag_stat, tn.node); |
| } |
| |
| static void tag_counter_set_tree_insert(struct tag_counter_set *data, |
| struct rb_root *root) |
| { |
| tag_node_tree_insert(&data->tn, root); |
| } |
| |
| static struct tag_counter_set *tag_counter_set_tree_search(struct rb_root *root, |
| tag_t tag) |
| { |
| struct tag_node *node = tag_node_tree_search(root, tag); |
| if (!node) |
| return NULL; |
| return rb_entry(&node->node, struct tag_counter_set, tn.node); |
| |
| } |
| |
| static void tag_ref_tree_insert(struct tag_ref *data, struct rb_root *root) |
| { |
| tag_node_tree_insert(&data->tn, root); |
| } |
| |
| static struct tag_ref *tag_ref_tree_search(struct rb_root *root, tag_t tag) |
| { |
| struct tag_node *node = tag_node_tree_search(root, tag); |
| if (!node) |
| return NULL; |
| return rb_entry(&node->node, struct tag_ref, tn.node); |
| } |
| |
| static struct sock_tag *sock_tag_tree_search(struct rb_root *root, |
| const struct sock *sk) |
| { |
| struct rb_node *node = root->rb_node; |
| |
| while (node) { |
| struct sock_tag *data = rb_entry(node, struct sock_tag, |
| sock_node); |
| if (sk < data->sk) |
| node = node->rb_left; |
| else if (sk > data->sk) |
| node = node->rb_right; |
| else |
| return data; |
| } |
| return NULL; |
| } |
| |
| static void sock_tag_tree_insert(struct sock_tag *data, struct rb_root *root) |
| { |
| struct rb_node **new = &(root->rb_node), *parent = NULL; |
| |
| /* Figure out where to put new node */ |
| while (*new) { |
| struct sock_tag *this = rb_entry(*new, struct sock_tag, |
| sock_node); |
| parent = *new; |
| if (data->sk < this->sk) |
| new = &((*new)->rb_left); |
| else if (data->sk > this->sk) |
| new = &((*new)->rb_right); |
| else |
| BUG(); |
| } |
| |
| /* Add new node and rebalance tree. */ |
| rb_link_node(&data->sock_node, parent, new); |
| rb_insert_color(&data->sock_node, root); |
| } |
| |
| static void sock_tag_tree_erase(struct rb_root *st_to_free_tree) |
| { |
| struct rb_node *node; |
| struct sock_tag *st_entry; |
| |
| node = rb_first(st_to_free_tree); |
| while (node) { |
| st_entry = rb_entry(node, struct sock_tag, sock_node); |
| node = rb_next(node); |
| CT_DEBUG("qtaguid: %s(): " |
| "erase st: sk=%p tag=0x%llx (uid=%u)\n", __func__, |
| st_entry->sk, |
| st_entry->tag, |
| get_uid_from_tag(st_entry->tag)); |
| rb_erase(&st_entry->sock_node, st_to_free_tree); |
| sockfd_put(st_entry->socket); |
| kfree(st_entry); |
| } |
| } |
| |
| static struct proc_qtu_data *proc_qtu_data_tree_search(struct rb_root *root, |
| const pid_t pid) |
| { |
| struct rb_node *node = root->rb_node; |
| |
| while (node) { |
| struct proc_qtu_data *data = rb_entry(node, |
| struct proc_qtu_data, |
| node); |
| if (pid < data->pid) |
| node = node->rb_left; |
| else if (pid > data->pid) |
| node = node->rb_right; |
| else |
| return data; |
| } |
| return NULL; |
| } |
| |
| static void proc_qtu_data_tree_insert(struct proc_qtu_data *data, |
| struct rb_root *root) |
| { |
| struct rb_node **new = &(root->rb_node), *parent = NULL; |
| |
| /* Figure out where to put new node */ |
| while (*new) { |
| struct proc_qtu_data *this = rb_entry(*new, |
| struct proc_qtu_data, |
| node); |
| parent = *new; |
| if (data->pid < this->pid) |
| new = &((*new)->rb_left); |
| else if (data->pid > this->pid) |
| new = &((*new)->rb_right); |
| else |
| BUG(); |
| } |
| |
| /* Add new node and rebalance tree. */ |
| rb_link_node(&data->node, parent, new); |
| rb_insert_color(&data->node, root); |
| } |
| |
| static void uid_tag_data_tree_insert(struct uid_tag_data *data, |
| struct rb_root *root) |
| { |
| struct rb_node **new = &(root->rb_node), *parent = NULL; |
| |
| /* Figure out where to put new node */ |
| while (*new) { |
| struct uid_tag_data *this = rb_entry(*new, |
| struct uid_tag_data, |
| node); |
| parent = *new; |
| if (data->uid < this->uid) |
| new = &((*new)->rb_left); |
| else if (data->uid > this->uid) |
| new = &((*new)->rb_right); |
| else |
| BUG(); |
| } |
| |
| /* Add new node and rebalance tree. */ |
| rb_link_node(&data->node, parent, new); |
| rb_insert_color(&data->node, root); |
| } |
| |
| static struct uid_tag_data *uid_tag_data_tree_search(struct rb_root *root, |
| uid_t uid) |
| { |
| struct rb_node *node = root->rb_node; |
| |
| while (node) { |
| struct uid_tag_data *data = rb_entry(node, |
| struct uid_tag_data, |
| node); |
| if (uid < data->uid) |
| node = node->rb_left; |
| else if (uid > data->uid) |
| node = node->rb_right; |
| else |
| return data; |
| } |
| return NULL; |
| } |
| |
| /* |
| * Allocates a new uid_tag_data struct if needed. |
| * Returns a pointer to the found or allocated uid_tag_data. |
| * Returns a PTR_ERR on failures, and lock is not held. |
| * If found is not NULL: |
| * sets *found to true if not allocated. |
| * sets *found to false if allocated. |
| */ |
| struct uid_tag_data *get_uid_data(uid_t uid, bool *found_res) |
| { |
| struct uid_tag_data *utd_entry; |
| |
| /* Look for top level uid_tag_data for the UID */ |
| utd_entry = uid_tag_data_tree_search(&uid_tag_data_tree, uid); |
| DR_DEBUG("qtaguid: get_uid_data(%u) utd=%p\n", uid, utd_entry); |
| |
| if (found_res) |
| *found_res = utd_entry; |
| if (utd_entry) |
| return utd_entry; |
| |
| utd_entry = kzalloc(sizeof(*utd_entry), GFP_ATOMIC); |
| if (!utd_entry) { |
| pr_err("qtaguid: get_uid_data(%u): " |
| "tag data alloc failed\n", uid); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| utd_entry->uid = uid; |
| utd_entry->tag_ref_tree = RB_ROOT; |
| uid_tag_data_tree_insert(utd_entry, &uid_tag_data_tree); |
| DR_DEBUG("qtaguid: get_uid_data(%u) new utd=%p\n", uid, utd_entry); |
| return utd_entry; |
| } |
| |
| /* Never returns NULL. Either PTR_ERR or a valid ptr. */ |
| static struct tag_ref *new_tag_ref(tag_t new_tag, |
| struct uid_tag_data *utd_entry) |
| { |
| struct tag_ref *tr_entry; |
| int res; |
| |
| if (utd_entry->num_active_tags + 1 > max_sock_tags) { |
| pr_info("qtaguid: new_tag_ref(0x%llx): " |
| "tag ref alloc quota exceeded. max=%d\n", |
| new_tag, max_sock_tags); |
| res = -EMFILE; |
| goto err_res; |
| |
| } |
| |
| tr_entry = kzalloc(sizeof(*tr_entry), GFP_ATOMIC); |
| if (!tr_entry) { |
| pr_err("qtaguid: new_tag_ref(0x%llx): " |
| "tag ref alloc failed\n", |
| new_tag); |
| res = -ENOMEM; |
| goto err_res; |
| } |
| tr_entry->tn.tag = new_tag; |
| /* tr_entry->num_sock_tags handled by caller */ |
| utd_entry->num_active_tags++; |
| tag_ref_tree_insert(tr_entry, &utd_entry->tag_ref_tree); |
| DR_DEBUG("qtaguid: new_tag_ref(0x%llx): " |
| " inserted new tag ref %p\n", |
| new_tag, tr_entry); |
| return tr_entry; |
| |
| err_res: |
| return ERR_PTR(res); |
| } |
| |
| static struct tag_ref *lookup_tag_ref(tag_t full_tag, |
| struct uid_tag_data **utd_res) |
| { |
| struct uid_tag_data *utd_entry; |
| struct tag_ref *tr_entry; |
| bool found_utd; |
| uid_t uid = get_uid_from_tag(full_tag); |
| |
| DR_DEBUG("qtaguid: lookup_tag_ref(tag=0x%llx (uid=%u))\n", |
| full_tag, uid); |
| |
| utd_entry = get_uid_data(uid, &found_utd); |
| if (IS_ERR_OR_NULL(utd_entry)) { |
| if (utd_res) |
| *utd_res = utd_entry; |
| return NULL; |
| } |
| |
| tr_entry = tag_ref_tree_search(&utd_entry->tag_ref_tree, full_tag); |
| if (utd_res) |
| *utd_res = utd_entry; |
| DR_DEBUG("qtaguid: lookup_tag_ref(0x%llx) utd_entry=%p tr_entry=%p\n", |
| full_tag, utd_entry, tr_entry); |
| return tr_entry; |
| } |
| |
| /* Never returns NULL. Either PTR_ERR or a valid ptr. */ |
| static struct tag_ref *get_tag_ref(tag_t full_tag, |
| struct uid_tag_data **utd_res) |
| { |
| struct uid_tag_data *utd_entry; |
| struct tag_ref *tr_entry; |
| |
| DR_DEBUG("qtaguid: get_tag_ref(0x%llx)\n", |
| full_tag); |
| spin_lock_bh(&uid_tag_data_tree_lock); |
| tr_entry = lookup_tag_ref(full_tag, &utd_entry); |
| BUG_ON(IS_ERR_OR_NULL(utd_entry)); |
| if (!tr_entry) |
| tr_entry = new_tag_ref(full_tag, utd_entry); |
| |
| spin_unlock_bh(&uid_tag_data_tree_lock); |
| if (utd_res) |
| *utd_res = utd_entry; |
| DR_DEBUG("qtaguid: get_tag_ref(0x%llx) utd=%p tr=%p\n", |
| full_tag, utd_entry, tr_entry); |
| return tr_entry; |
| } |
| |
| /* Checks and maybe frees the UID Tag Data entry */ |
| static void put_utd_entry(struct uid_tag_data *utd_entry) |
| { |
| /* Are we done with the UID tag data entry? */ |
| if (RB_EMPTY_ROOT(&utd_entry->tag_ref_tree) && |
| !utd_entry->num_pqd) { |
| DR_DEBUG("qtaguid: %s(): " |
| "erase utd_entry=%p uid=%u " |
| "by pid=%u tgid=%u uid=%u\n", __func__, |
| utd_entry, utd_entry->uid, |
| current->pid, current->tgid, current_fsuid()); |
| BUG_ON(utd_entry->num_active_tags); |
| rb_erase(&utd_entry->node, &uid_tag_data_tree); |
| kfree(utd_entry); |
| } else { |
| DR_DEBUG("qtaguid: %s(): " |
| "utd_entry=%p still has %d tags %d proc_qtu_data\n", |
| __func__, utd_entry, utd_entry->num_active_tags, |
| utd_entry->num_pqd); |
| BUG_ON(!(utd_entry->num_active_tags || |
| utd_entry->num_pqd)); |
| } |
| } |
| |
| /* |
| * If no sock_tags are using this tag_ref, |
| * decrements refcount of utd_entry, removes tr_entry |
| * from utd_entry->tag_ref_tree and frees. |
| */ |
| static void free_tag_ref_from_utd_entry(struct tag_ref *tr_entry, |
| struct uid_tag_data *utd_entry) |
| { |
| DR_DEBUG("qtaguid: %s(): %p tag=0x%llx (uid=%u)\n", __func__, |
| tr_entry, tr_entry->tn.tag, |
| get_uid_from_tag(tr_entry->tn.tag)); |
| if (!tr_entry->num_sock_tags) { |
| BUG_ON(!utd_entry->num_active_tags); |
| utd_entry->num_active_tags--; |
| rb_erase(&tr_entry->tn.node, &utd_entry->tag_ref_tree); |
| DR_DEBUG("qtaguid: %s(): erased %p\n", __func__, tr_entry); |
| kfree(tr_entry); |
| } |
| } |
| |
| static void put_tag_ref_tree(tag_t full_tag, struct uid_tag_data *utd_entry) |
| { |
| struct rb_node *node; |
| struct tag_ref *tr_entry; |
| tag_t acct_tag; |
| |
| DR_DEBUG("qtaguid: %s(tag=0x%llx (uid=%u))\n", __func__, |
| full_tag, get_uid_from_tag(full_tag)); |
| acct_tag = get_atag_from_tag(full_tag); |
| node = rb_first(&utd_entry->tag_ref_tree); |
| while (node) { |
| tr_entry = rb_entry(node, struct tag_ref, tn.node); |
| node = rb_next(node); |
| if (!acct_tag || tr_entry->tn.tag == full_tag) |
| free_tag_ref_from_utd_entry(tr_entry, utd_entry); |
| } |
| } |
| |
| static int read_proc_u64(char *page, char **start, off_t off, |
| int count, int *eof, void *data) |
| { |
| int len; |
| uint64_t value; |
| char *p = page; |
| uint64_t *iface_entry = data; |
| |
| if (!data) |
| return 0; |
| |
| value = *iface_entry; |
| p += sprintf(p, "%llu\n", value); |
| len = (p - page) - off; |
| *eof = (len <= count) ? 1 : 0; |
| *start = page + off; |
| return len; |
| } |
| |
| static int read_proc_bool(char *page, char **start, off_t off, |
| int count, int *eof, void *data) |
| { |
| int len; |
| bool value; |
| char *p = page; |
| bool *bool_entry = data; |
| |
| if (!data) |
| return 0; |
| |
| value = *bool_entry; |
| p += sprintf(p, "%u\n", value); |
| len = (p - page) - off; |
| *eof = (len <= count) ? 1 : 0; |
| *start = page + off; |
| return len; |
| } |
| |
| static int get_active_counter_set(tag_t tag) |
| { |
| int active_set = 0; |
| struct tag_counter_set *tcs; |
| |
| MT_DEBUG("qtaguid: get_active_counter_set(tag=0x%llx)" |
| " (uid=%u)\n", |
| tag, get_uid_from_tag(tag)); |
| /* For now we only handle UID tags for active sets */ |
| tag = get_utag_from_tag(tag); |
| spin_lock_bh(&tag_counter_set_list_lock); |
| tcs = tag_counter_set_tree_search(&tag_counter_set_tree, tag); |
| if (tcs) |
| active_set = tcs->active_set; |
| spin_unlock_bh(&tag_counter_set_list_lock); |
| return active_set; |
| } |
| |
| /* |
| * Find the entry for tracking the specified interface. |
| * Caller must hold iface_stat_list_lock |
| */ |
| static struct iface_stat *get_iface_entry(const char *ifname) |
| { |
| struct iface_stat *iface_entry; |
| |
| /* Find the entry for tracking the specified tag within the interface */ |
| if (ifname == NULL) { |
| pr_info("qtaguid: iface_stat: get() NULL device name\n"); |
| return NULL; |
| } |
| |
| /* Iterate over interfaces */ |
| list_for_each_entry(iface_entry, &iface_stat_list, list) { |
| if (!strcmp(ifname, iface_entry->ifname)) |
| goto done; |
| } |
| iface_entry = NULL; |
| done: |
| return iface_entry; |
| } |
| |
| static int iface_stat_fmt_proc_read(char *page, char **num_items_returned, |
| off_t items_to_skip, int char_count, |
| int *eof, void *data) |
| { |
| char *outp = page; |
| int item_index = 0; |
| int len; |
| int fmt = (int)data; /* The data is just 1 (old) or 2 (uses fmt) */ |
| struct iface_stat *iface_entry; |
| struct rtnl_link_stats64 dev_stats, *stats; |
| struct rtnl_link_stats64 no_dev_stats = {0}; |
| |
| if (unlikely(module_passive)) { |
| *eof = 1; |
| return 0; |
| } |
| |
| CT_DEBUG("qtaguid:proc iface_stat_fmt " |
| "pid=%u tgid=%u uid=%u " |
| "page=%p *num_items_returned=%p off=%ld " |
| "char_count=%d *eof=%d\n", |
| current->pid, current->tgid, current_fsuid(), |
| page, *num_items_returned, |
| items_to_skip, char_count, *eof); |
| |
| if (*eof) |
| return 0; |
| |
| if (fmt == 2 && item_index++ >= items_to_skip) { |
| len = snprintf(outp, char_count, |
| "ifname " |
| "total_skb_rx_bytes total_skb_rx_packets " |
| "total_skb_tx_bytes total_skb_tx_packets\n" |
| ); |
| if (len >= char_count) { |
| *outp = '\0'; |
| return outp - page; |
| } |
| outp += len; |
| char_count -= len; |
| (*num_items_returned)++; |
| } |
| |
| /* |
| * This lock will prevent iface_stat_update() from changing active, |
| * and in turn prevent an interface from unregistering itself. |
| */ |
| spin_lock_bh(&iface_stat_list_lock); |
| list_for_each_entry(iface_entry, &iface_stat_list, list) { |
| if (item_index++ < items_to_skip) |
| continue; |
| |
| if (iface_entry->active) { |
| stats = dev_get_stats(iface_entry->net_dev, |
| &dev_stats); |
| } else { |
| stats = &no_dev_stats; |
| } |
| /* |
| * If the meaning of the data changes, then update the fmtX |
| * string. |
| */ |
| if (fmt == 1) { |
| len = snprintf( |
| outp, char_count, |
| "%s %d " |
| "%llu %llu %llu %llu " |
| "%llu %llu %llu %llu\n", |
| iface_entry->ifname, |
| iface_entry->active, |
| iface_entry->totals_via_dev[IFS_RX].bytes, |
| iface_entry->totals_via_dev[IFS_RX].packets, |
| iface_entry->totals_via_dev[IFS_TX].bytes, |
| iface_entry->totals_via_dev[IFS_TX].packets, |
| stats->rx_bytes, stats->rx_packets, |
| stats->tx_bytes, stats->tx_packets |
| ); |
| } else { |
| len = snprintf( |
| outp, char_count, |
| "%s " |
| "%llu %llu %llu %llu\n", |
| iface_entry->ifname, |
| iface_entry->totals_via_skb[IFS_RX].bytes, |
| iface_entry->totals_via_skb[IFS_RX].packets, |
| iface_entry->totals_via_skb[IFS_TX].bytes, |
| iface_entry->totals_via_skb[IFS_TX].packets |
| ); |
| } |
| if (len >= char_count) { |
| spin_unlock_bh(&iface_stat_list_lock); |
| *outp = '\0'; |
| return outp - page; |
| } |
| outp += len; |
| char_count -= len; |
| (*num_items_returned)++; |
| } |
| spin_unlock_bh(&iface_stat_list_lock); |
| |
| *eof = 1; |
| return outp - page; |
| } |
| |
| static void iface_create_proc_worker(struct work_struct *work) |
| { |
| struct proc_dir_entry *proc_entry; |
| struct iface_stat_work *isw = container_of(work, struct iface_stat_work, |
| iface_work); |
| struct iface_stat *new_iface = isw->iface_entry; |
| |
| /* iface_entries are not deleted, so safe to manipulate. */ |
| proc_entry = proc_mkdir(new_iface->ifname, iface_stat_procdir); |
| if (IS_ERR_OR_NULL(proc_entry)) { |
| pr_err("qtaguid: iface_stat: create_proc(): alloc failed.\n"); |
| kfree(isw); |
| return; |
| } |
| |
| new_iface->proc_ptr = proc_entry; |
| |
| create_proc_read_entry("tx_bytes", proc_iface_perms, proc_entry, |
| read_proc_u64, |
| &new_iface->totals_via_dev[IFS_TX].bytes); |
| create_proc_read_entry("rx_bytes", proc_iface_perms, proc_entry, |
| read_proc_u64, |
| &new_iface->totals_via_dev[IFS_RX].bytes); |
| create_proc_read_entry("tx_packets", proc_iface_perms, proc_entry, |
| read_proc_u64, |
| &new_iface->totals_via_dev[IFS_TX].packets); |
| create_proc_read_entry("rx_packets", proc_iface_perms, proc_entry, |
| read_proc_u64, |
| &new_iface->totals_via_dev[IFS_RX].packets); |
| create_proc_read_entry("active", proc_iface_perms, proc_entry, |
| read_proc_bool, &new_iface->active); |
| |
| IF_DEBUG("qtaguid: iface_stat: create_proc(): done " |
| "entry=%p dev=%s\n", new_iface, new_iface->ifname); |
| kfree(isw); |
| } |
| |
| /* |
| * Will set the entry's active state, and |
| * update the net_dev accordingly also. |
| */ |
| static void _iface_stat_set_active(struct iface_stat *entry, |
| struct net_device *net_dev, |
| bool activate) |
| { |
| if (activate) { |
| entry->net_dev = net_dev; |
| entry->active = true; |
| IF_DEBUG("qtaguid: %s(%s): " |
| "enable tracking. rfcnt=%d\n", __func__, |
| entry->ifname, |
| percpu_read(*net_dev->pcpu_refcnt)); |
| } else { |
| entry->active = false; |
| entry->net_dev = NULL; |
| IF_DEBUG("qtaguid: %s(%s): " |
| "disable tracking. rfcnt=%d\n", __func__, |
| entry->ifname, |
| percpu_read(*net_dev->pcpu_refcnt)); |
| |
| } |
| } |
| |
| /* Caller must hold iface_stat_list_lock */ |
| static struct iface_stat *iface_alloc(struct net_device *net_dev) |
| { |
| struct iface_stat *new_iface; |
| struct iface_stat_work *isw; |
| |
| new_iface = kzalloc(sizeof(*new_iface), GFP_ATOMIC); |
| if (new_iface == NULL) { |
| pr_err("qtaguid: iface_stat: create(%s): " |
| "iface_stat alloc failed\n", net_dev->name); |
| return NULL; |
| } |
| new_iface->ifname = kstrdup(net_dev->name, GFP_ATOMIC); |
| if (new_iface->ifname == NULL) { |
| pr_err("qtaguid: iface_stat: create(%s): " |
| "ifname alloc failed\n", net_dev->name); |
| kfree(new_iface); |
| return NULL; |
| } |
| spin_lock_init(&new_iface->tag_stat_list_lock); |
| new_iface->tag_stat_tree = RB_ROOT; |
| _iface_stat_set_active(new_iface, net_dev, true); |
| |
| /* |
| * ipv6 notifier chains are atomic :( |
| * No create_proc_read_entry() for you! |
| */ |
| isw = kmalloc(sizeof(*isw), GFP_ATOMIC); |
| if (!isw) { |
| pr_err("qtaguid: iface_stat: create(%s): " |
| "work alloc failed\n", new_iface->ifname); |
| _iface_stat_set_active(new_iface, net_dev, false); |
| kfree(new_iface->ifname); |
| kfree(new_iface); |
| return NULL; |
| } |
| isw->iface_entry = new_iface; |
| INIT_WORK(&isw->iface_work, iface_create_proc_worker); |
| schedule_work(&isw->iface_work); |
| list_add(&new_iface->list, &iface_stat_list); |
| return new_iface; |
| } |
| |
| static void iface_check_stats_reset_and_adjust(struct net_device *net_dev, |
| struct iface_stat *iface) |
| { |
| struct rtnl_link_stats64 dev_stats, *stats; |
| bool stats_rewound; |
| |
| stats = dev_get_stats(net_dev, &dev_stats); |
| /* No empty packets */ |
| stats_rewound = |
| (stats->rx_bytes < iface->last_known[IFS_RX].bytes) |
| || (stats->tx_bytes < iface->last_known[IFS_TX].bytes); |
| |
| IF_DEBUG("qtaguid: %s(%s): iface=%p netdev=%p " |
| "bytes rx/tx=%llu/%llu " |
| "active=%d last_known=%d " |
| "stats_rewound=%d\n", __func__, |
| net_dev ? net_dev->name : "?", |
| iface, net_dev, |
| stats->rx_bytes, stats->tx_bytes, |
| iface->active, iface->last_known_valid, stats_rewound); |
| |
| if (iface->active && iface->last_known_valid && stats_rewound) { |
| pr_warn_once("qtaguid: iface_stat: %s(%s): " |
| "iface reset its stats unexpectedly\n", __func__, |
| net_dev->name); |
| |
| iface->totals_via_dev[IFS_TX].bytes += |
| iface->last_known[IFS_TX].bytes; |
| iface->totals_via_dev[IFS_TX].packets += |
| iface->last_known[IFS_TX].packets; |
| iface->totals_via_dev[IFS_RX].bytes += |
| iface->last_known[IFS_RX].bytes; |
| iface->totals_via_dev[IFS_RX].packets += |
| iface->last_known[IFS_RX].packets; |
| iface->last_known_valid = false; |
| IF_DEBUG("qtaguid: %s(%s): iface=%p " |
| "used last known bytes rx/tx=%llu/%llu\n", __func__, |
| iface->ifname, iface, iface->last_known[IFS_RX].bytes, |
| iface->last_known[IFS_TX].bytes); |
| } |
| } |
| |
| /* |
| * Create a new entry for tracking the specified interface. |
| * Do nothing if the entry already exists. |
| * Called when an interface is configured with a valid IP address. |
| */ |
| static void iface_stat_create(struct net_device *net_dev, |
| struct in_ifaddr *ifa) |
| { |
| struct in_device *in_dev = NULL; |
| const char *ifname; |
| struct iface_stat *entry; |
| __be32 ipaddr = 0; |
| struct iface_stat *new_iface; |
| |
| IF_DEBUG("qtaguid: iface_stat: create(%s): ifa=%p netdev=%p\n", |
| net_dev ? net_dev->name : "?", |
| ifa, net_dev); |
| if (!net_dev) { |
| pr_err("qtaguid: iface_stat: create(): no net dev\n"); |
| return; |
| } |
| |
| ifname = net_dev->name; |
| if (!ifa) { |
| in_dev = in_dev_get(net_dev); |
| if (!in_dev) { |
| pr_err("qtaguid: iface_stat: create(%s): no inet dev\n", |
| ifname); |
| return; |
| } |
| IF_DEBUG("qtaguid: iface_stat: create(%s): in_dev=%p\n", |
| ifname, in_dev); |
| for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
| IF_DEBUG("qtaguid: iface_stat: create(%s): " |
| "ifa=%p ifa_label=%s\n", |
| ifname, ifa, |
| ifa->ifa_label ? ifa->ifa_label : "(null)"); |
| if (ifa->ifa_label && !strcmp(ifname, ifa->ifa_label)) |
| break; |
| } |
| } |
| |
| if (!ifa) { |
| IF_DEBUG("qtaguid: iface_stat: create(%s): no matching IP\n", |
| ifname); |
| goto done_put; |
| } |
| ipaddr = ifa->ifa_local; |
| |
| spin_lock_bh(&iface_stat_list_lock); |
| entry = get_iface_entry(ifname); |
| if (entry != NULL) { |
| bool activate = !ipv4_is_loopback(ipaddr); |
| IF_DEBUG("qtaguid: iface_stat: create(%s): entry=%p\n", |
| ifname, entry); |
| iface_check_stats_reset_and_adjust(net_dev, entry); |
| _iface_stat_set_active(entry, net_dev, activate); |
| IF_DEBUG("qtaguid: %s(%s): " |
| "tracking now %d on ip=%pI4\n", __func__, |
| entry->ifname, activate, &ipaddr); |
| goto done_unlock_put; |
| } else if (ipv4_is_loopback(ipaddr)) { |
| IF_DEBUG("qtaguid: iface_stat: create(%s): " |
| "ignore loopback dev. ip=%pI4\n", ifname, &ipaddr); |
| goto done_unlock_put; |
| } |
| |
| new_iface = iface_alloc(net_dev); |
| IF_DEBUG("qtaguid: iface_stat: create(%s): done " |
| "entry=%p ip=%pI4\n", ifname, new_iface, &ipaddr); |
| done_unlock_put: |
| spin_unlock_bh(&iface_stat_list_lock); |
| done_put: |
| if (in_dev) |
| in_dev_put(in_dev); |
| } |
| |
| static void iface_stat_create_ipv6(struct net_device *net_dev, |
| struct inet6_ifaddr *ifa) |
| { |
| struct in_device *in_dev; |
| const char *ifname; |
| struct iface_stat *entry; |
| struct iface_stat *new_iface; |
| int addr_type; |
| |
| IF_DEBUG("qtaguid: iface_stat: create6(): ifa=%p netdev=%p->name=%s\n", |
| ifa, net_dev, net_dev ? net_dev->name : ""); |
| if (!net_dev) { |
| pr_err("qtaguid: iface_stat: create6(): no net dev!\n"); |
| return; |
| } |
| ifname = net_dev->name; |
| |
| in_dev = in_dev_get(net_dev); |
| if (!in_dev) { |
| pr_err("qtaguid: iface_stat: create6(%s): no inet dev\n", |
| ifname); |
| return; |
| } |
| |
| IF_DEBUG("qtaguid: iface_stat: create6(%s): in_dev=%p\n", |
| ifname, in_dev); |
| |
| if (!ifa) { |
| IF_DEBUG("qtaguid: iface_stat: create6(%s): no matching IP\n", |
| ifname); |
| goto done_put; |
| } |
| addr_type = ipv6_addr_type(&ifa->addr); |
| |
| spin_lock_bh(&iface_stat_list_lock); |
| entry = get_iface_entry(ifname); |
| if (entry != NULL) { |
| bool activate = !(addr_type & IPV6_ADDR_LOOPBACK); |
| IF_DEBUG("qtaguid: %s(%s): entry=%p\n", __func__, |
| ifname, entry); |
| iface_check_stats_reset_and_adjust(net_dev, entry); |
| _iface_stat_set_active(entry, net_dev, activate); |
| IF_DEBUG("qtaguid: %s(%s): " |
| "tracking now %d on ip=%pI6c\n", __func__, |
| entry->ifname, activate, &ifa->addr); |
| goto done_unlock_put; |
| } else if (addr_type & IPV6_ADDR_LOOPBACK) { |
| IF_DEBUG("qtaguid: %s(%s): " |
| "ignore loopback dev. ip=%pI6c\n", __func__, |
| ifname, &ifa->addr); |
| goto done_unlock_put; |
| } |
| |
| new_iface = iface_alloc(net_dev); |
| IF_DEBUG("qtaguid: iface_stat: create6(%s): done " |
| "entry=%p ip=%pI6c\n", ifname, new_iface, &ifa->addr); |
| |
| done_unlock_put: |
| spin_unlock_bh(&iface_stat_list_lock); |
| done_put: |
| in_dev_put(in_dev); |
| } |
| |
| static struct sock_tag *get_sock_stat_nl(const struct sock *sk) |
| { |
| MT_DEBUG("qtaguid: get_sock_stat_nl(sk=%p)\n", sk); |
| return sock_tag_tree_search(&sock_tag_tree, sk); |
| } |
| |
| static struct sock_tag *get_sock_stat(const struct sock *sk) |
| { |
| struct sock_tag *sock_tag_entry; |
| MT_DEBUG("qtaguid: get_sock_stat(sk=%p)\n", sk); |
| if (!sk) |
| return NULL; |
| spin_lock_bh(&sock_tag_list_lock); |
| sock_tag_entry = get_sock_stat_nl(sk); |
| spin_unlock_bh(&sock_tag_list_lock); |
| return sock_tag_entry; |
| } |
| |
| static int ipx_proto(const struct sk_buff *skb, |
| struct xt_action_param *par) |
| { |
| int thoff = 0, tproto; |
| |
| switch (par->family) { |
| case NFPROTO_IPV6: |
| tproto = ipv6_find_hdr(skb, &thoff, -1, NULL); |
| if (tproto < 0) |
| MT_DEBUG("%s(): transport header not found in ipv6" |
| " skb=%p\n", __func__, skb); |
| break; |
| case NFPROTO_IPV4: |
| tproto = ip_hdr(skb)->protocol; |
| break; |
| default: |
| tproto = IPPROTO_RAW; |
| } |
| return tproto; |
| } |
| |
| static void |
| data_counters_update(struct data_counters *dc, int set, |
| enum ifs_tx_rx direction, int proto, int bytes) |
| { |
| switch (proto) { |
| case IPPROTO_TCP: |
| dc_add_byte_packets(dc, set, direction, IFS_TCP, bytes, 1); |
| break; |
| case IPPROTO_UDP: |
| dc_add_byte_packets(dc, set, direction, IFS_UDP, bytes, 1); |
| break; |
| case IPPROTO_IP: |
| default: |
| dc_add_byte_packets(dc, set, direction, IFS_PROTO_OTHER, bytes, |
| 1); |
| break; |
| } |
| } |
| |
| /* |
| * Update stats for the specified interface. Do nothing if the entry |
| * does not exist (when a device was never configured with an IP address). |
| * Called when an device is being unregistered. |
| */ |
| static void iface_stat_update(struct net_device *net_dev, bool stash_only) |
| { |
| struct rtnl_link_stats64 dev_stats, *stats; |
| struct iface_stat *entry; |
| |
| stats = dev_get_stats(net_dev, &dev_stats); |
| spin_lock_bh(&iface_stat_list_lock); |
| entry = get_iface_entry(net_dev->name); |
| if (entry == NULL) { |
| IF_DEBUG("qtaguid: iface_stat: update(%s): not tracked\n", |
| net_dev->name); |
| spin_unlock_bh(&iface_stat_list_lock); |
| return; |
| } |
| |
| IF_DEBUG("qtaguid: %s(%s): entry=%p\n", __func__, |
| net_dev->name, entry); |
| if (!entry->active) { |
| IF_DEBUG("qtaguid: %s(%s): already disabled\n", __func__, |
| net_dev->name); |
| spin_unlock_bh(&iface_stat_list_lock); |
| return; |
| } |
| |
| if (stash_only) { |
| entry->last_known[IFS_TX].bytes = stats->tx_bytes; |
| entry->last_known[IFS_TX].packets = stats->tx_packets; |
| entry->last_known[IFS_RX].bytes = stats->rx_bytes; |
| entry->last_known[IFS_RX].packets = stats->rx_packets; |
| entry->last_known_valid = true; |
| IF_DEBUG("qtaguid: %s(%s): " |
| "dev stats stashed rx/tx=%llu/%llu\n", __func__, |
| net_dev->name, stats->rx_bytes, stats->tx_bytes); |
| spin_unlock_bh(&iface_stat_list_lock); |
| return; |
| } |
| entry->totals_via_dev[IFS_TX].bytes += stats->tx_bytes; |
| entry->totals_via_dev[IFS_TX].packets += stats->tx_packets; |
| entry->totals_via_dev[IFS_RX].bytes += stats->rx_bytes; |
| entry->totals_via_dev[IFS_RX].packets += stats->rx_packets; |
| /* We don't need the last_known[] anymore */ |
| entry->last_known_valid = false; |
| _iface_stat_set_active(entry, net_dev, false); |
| IF_DEBUG("qtaguid: %s(%s): " |
| "disable tracking. rx/tx=%llu/%llu\n", __func__, |
| net_dev->name, stats->rx_bytes, stats->tx_bytes); |
| spin_unlock_bh(&iface_stat_list_lock); |
| } |
| |
| /* |
| * Update stats for the specified interface from the skb. |
| * Do nothing if the entry |
| * does not exist (when a device was never configured with an IP address). |
| * Called on each sk. |
| */ |
| static void iface_stat_update_from_skb(const struct sk_buff *skb, |
| struct xt_action_param *par) |
| { |
| struct iface_stat *entry; |
| const struct net_device *el_dev; |
| enum ifs_tx_rx direction = par->in ? IFS_RX : IFS_TX; |
| int bytes = skb->len; |
| |
| if (!skb->dev) { |
| MT_DEBUG("qtaguid[%d]: no skb->dev\n", par->hooknum); |
| el_dev = par->in ? : par->out; |
| } else { |
| const struct net_device *other_dev; |
| el_dev = skb->dev; |
| other_dev = par->in ? : par->out; |
| if (el_dev != other_dev) { |
| MT_DEBUG("qtaguid[%d]: skb->dev=%p %s vs " |
| "par->(in/out)=%p %s\n", |
| par->hooknum, el_dev, el_dev->name, other_dev, |
| other_dev->name); |
| } |
| } |
| |
| if (unlikely(!el_dev)) { |
| pr_err("qtaguid[%d]: %s(): no par->in/out?!!\n", |
| par->hooknum, __func__); |
| BUG(); |
| } else if (unlikely(!el_dev->name)) { |
| pr_err("qtaguid[%d]: %s(): no dev->name?!!\n", |
| par->hooknum, __func__); |
| BUG(); |
| } else { |
| int proto = ipx_proto(skb, par); |
| MT_DEBUG("qtaguid[%d]: dev name=%s type=%d fam=%d proto=%d\n", |
| par->hooknum, el_dev->name, el_dev->type, |
| par->family, proto); |
| } |
| |
| spin_lock_bh(&iface_stat_list_lock); |
| entry = get_iface_entry(el_dev->name); |
| if (entry == NULL) { |
| IF_DEBUG("qtaguid: iface_stat: %s(%s): not tracked\n", |
| __func__, el_dev->name); |
| spin_unlock_bh(&iface_stat_list_lock); |
| return; |
| } |
| |
| IF_DEBUG("qtaguid: %s(%s): entry=%p\n", __func__, |
| el_dev->name, entry); |
| |
| entry->totals_via_skb[direction].bytes += bytes; |
| entry->totals_via_skb[direction].packets++; |
| spin_unlock_bh(&iface_stat_list_lock); |
| } |
| |
| static void tag_stat_update(struct tag_stat *tag_entry, |
| enum ifs_tx_rx direction, int proto, int bytes) |
| { |
| int active_set; |
| active_set = get_active_counter_set(tag_entry->tn.tag); |
| MT_DEBUG("qtaguid: tag_stat_update(tag=0x%llx (uid=%u) set=%d " |
| "dir=%d proto=%d bytes=%d)\n", |
| tag_entry->tn.tag, get_uid_from_tag(tag_entry->tn.tag), |
| active_set, direction, proto, bytes); |
| data_counters_update(&tag_entry->counters, active_set, direction, |
| proto, bytes); |
| if (tag_entry->parent_counters) |
| data_counters_update(tag_entry->parent_counters, active_set, |
| direction, proto, bytes); |
| } |
| |
| /* |
| * Create a new entry for tracking the specified {acct_tag,uid_tag} within |
| * the interface. |
| * iface_entry->tag_stat_list_lock should be held. |
| */ |
| static struct tag_stat *create_if_tag_stat(struct iface_stat *iface_entry, |
| tag_t tag) |
| { |
| struct tag_stat *new_tag_stat_entry = NULL; |
| IF_DEBUG("qtaguid: iface_stat: %s(): ife=%p tag=0x%llx" |
| " (uid=%u)\n", __func__, |
| iface_entry, tag, get_uid_from_tag(tag)); |
| new_tag_stat_entry = kzalloc(sizeof(*new_tag_stat_entry), GFP_ATOMIC); |
| if (!new_tag_stat_entry) { |
| pr_err("qtaguid: iface_stat: tag stat alloc failed\n"); |
| goto done; |
| } |
| new_tag_stat_entry->tn.tag = tag; |
| tag_stat_tree_insert(new_tag_stat_entry, &iface_entry->tag_stat_tree); |
| done: |
| return new_tag_stat_entry; |
| } |
| |
| static void if_tag_stat_update(const char *ifname, uid_t uid, |
| const struct sock *sk, enum ifs_tx_rx direction, |
| int proto, int bytes) |
| { |
| struct tag_stat *tag_stat_entry; |
| tag_t tag, acct_tag; |
| tag_t uid_tag; |
| struct data_counters *uid_tag_counters; |
| struct sock_tag *sock_tag_entry; |
| struct iface_stat *iface_entry; |
| struct tag_stat *new_tag_stat = NULL; |
| MT_DEBUG("qtaguid: if_tag_stat_update(ifname=%s " |
| "uid=%u sk=%p dir=%d proto=%d bytes=%d)\n", |
| ifname, uid, sk, direction, proto, bytes); |
| |
| |
| spin_lock_bh(&iface_stat_list_lock); |
| iface_entry = get_iface_entry(ifname); |
| if (!iface_entry) { |
| spin_unlock_bh(&iface_stat_list_lock); |
| pr_err("qtaguid: iface_stat: stat_update() %s not found\n", |
| ifname); |
| return; |
| } |
| spin_unlock_bh(&iface_stat_list_lock); |
| /* It is ok to process data when an iface_entry is inactive */ |
| |
| MT_DEBUG("qtaguid: iface_stat: stat_update() dev=%s entry=%p\n", |
| ifname, iface_entry); |
| |
| /* |
| * Look for a tagged sock. |
| * It will have an acct_uid. |
| */ |
| sock_tag_entry = get_sock_stat(sk); |
| if (sock_tag_entry) { |
| tag = sock_tag_entry->tag; |
| acct_tag = get_atag_from_tag(tag); |
| uid_tag = get_utag_from_tag(tag); |
| } else { |
| acct_tag = make_atag_from_value(0); |
| tag = combine_atag_with_uid(acct_tag, uid); |
| uid_tag = make_tag_from_uid(uid); |
| } |
| MT_DEBUG("qtaguid: iface_stat: stat_update(): " |
| " looking for tag=0x%llx (uid=%u) in ife=%p\n", |
| tag, get_uid_from_tag(tag), iface_entry); |
| /* Loop over tag list under this interface for {acct_tag,uid_tag} */ |
| spin_lock_bh(&iface_entry->tag_stat_list_lock); |
| |
| tag_stat_entry = tag_stat_tree_search(&iface_entry->tag_stat_tree, |
| tag); |
| if (tag_stat_entry) { |
| /* |
| * Updating the {acct_tag, uid_tag} entry handles both stats: |
| * {0, uid_tag} will also get updated. |
| */ |
| tag_stat_update(tag_stat_entry, direction, proto, bytes); |
| spin_unlock_bh(&iface_entry->tag_stat_list_lock); |
| return; |
| } |
| |
| /* Loop over tag list under this interface for {0,uid_tag} */ |
| tag_stat_entry = tag_stat_tree_search(&iface_entry->tag_stat_tree, |
| uid_tag); |
| if (!tag_stat_entry) { |
| /* Here: the base uid_tag did not exist */ |
| /* |
| * No parent counters. So |
| * - No {0, uid_tag} stats and no {acc_tag, uid_tag} stats. |
| */ |
| new_tag_stat = create_if_tag_stat(iface_entry, uid_tag); |
| uid_tag_counters = &new_tag_stat->counters; |
| } else { |
| uid_tag_counters = &tag_stat_entry->counters; |
| } |
| |
| if (acct_tag) { |
| /* Create the child {acct_tag, uid_tag} and hook up parent. */ |
| new_tag_stat = create_if_tag_stat(iface_entry, tag); |
| new_tag_stat->parent_counters = uid_tag_counters; |
| } else { |
| /* |
| * For new_tag_stat to be still NULL here would require: |
| * {0, uid_tag} exists |
| * and {acct_tag, uid_tag} doesn't exist |
| * AND acct_tag == 0. |
| * Impossible. This reassures us that new_tag_stat |
| * below will always be assigned. |
| */ |
| BUG_ON(!new_tag_stat); |
| } |
| tag_stat_update(new_tag_stat, direction, proto, bytes); |
| spin_unlock_bh(&iface_entry->tag_stat_list_lock); |
| } |
| |
| static int iface_netdev_event_handler(struct notifier_block *nb, |
| unsigned long event, void *ptr) { |
| struct net_device *dev = ptr; |
| |
| if (unlikely(module_passive)) |
| return NOTIFY_DONE; |
| |
| IF_DEBUG("qtaguid: iface_stat: netdev_event(): " |
| "ev=0x%lx/%s netdev=%p->name=%s\n", |
| event, netdev_evt_str(event), dev, dev ? dev->name : ""); |
| |
| switch (event) { |
| case NETDEV_UP: |
| iface_stat_create(dev, NULL); |
| atomic64_inc(&qtu_events.iface_events); |
| break; |
| case NETDEV_DOWN: |
| case NETDEV_UNREGISTER: |
| iface_stat_update(dev, event == NETDEV_DOWN); |
| atomic64_inc(&qtu_events.iface_events); |
| break; |
| } |
| return NOTIFY_DONE; |
| } |
| |
| static int iface_inet6addr_event_handler(struct notifier_block *nb, |
| unsigned long event, void *ptr) |
| { |
| struct inet6_ifaddr *ifa = ptr; |
| struct net_device *dev; |
| |
| if (unlikely(module_passive)) |
| return NOTIFY_DONE; |
| |
| IF_DEBUG("qtaguid: iface_stat: inet6addr_event(): " |
| "ev=0x%lx/%s ifa=%p\n", |
| event, netdev_evt_str(event), ifa); |
| |
| switch (event) { |
| case NETDEV_UP: |
| BUG_ON(!ifa || !ifa->idev); |
| dev = (struct net_device *)ifa->idev->dev; |
| iface_stat_create_ipv6(dev, ifa); |
| atomic64_inc(&qtu_events.iface_events); |
| break; |
| case NETDEV_DOWN: |
| case NETDEV_UNREGISTER: |
| BUG_ON(!ifa || !ifa->idev); |
| dev = (struct net_device *)ifa->idev->dev; |
| iface_stat_update(dev, event == NETDEV_DOWN); |
| atomic64_inc(&qtu_events.iface_events); |
| break; |
| } |
| return NOTIFY_DONE; |
| } |
| |
| static int iface_inetaddr_event_handler(struct notifier_block *nb, |
| unsigned long event, void *ptr) |
| { |
| struct in_ifaddr *ifa = ptr; |
| struct net_device *dev; |
| |
| if (unlikely(module_passive)) |
| return NOTIFY_DONE; |
| |
| IF_DEBUG("qtaguid: iface_stat: inetaddr_event(): " |
| "ev=0x%lx/%s ifa=%p\n", |
| event, netdev_evt_str(event), ifa); |
| |
| switch (event) { |
| case NETDEV_UP: |
| BUG_ON(!ifa || !ifa->ifa_dev); |
| dev = ifa->ifa_dev->dev; |
| iface_stat_create(dev, ifa); |
| atomic64_inc(&qtu_events.iface_events); |
| break; |
| case NETDEV_DOWN: |
| case NETDEV_UNREGISTER: |
| BUG_ON(!ifa || !ifa->ifa_dev); |
| dev = ifa->ifa_dev->dev; |
| iface_stat_update(dev, event == NETDEV_DOWN); |
| atomic64_inc(&qtu_events.iface_events); |
| break; |
| } |
| return NOTIFY_DONE; |
| } |
| |
| static struct notifier_block iface_netdev_notifier_blk = { |
| .notifier_call = iface_netdev_event_handler, |
| }; |
| |
| static struct notifier_block iface_inetaddr_notifier_blk = { |
| .notifier_call = iface_inetaddr_event_handler, |
| }; |
| |
| static struct notifier_block iface_inet6addr_notifier_blk = { |
| .notifier_call = iface_inet6addr_event_handler, |
| }; |
| |
| static int __init iface_stat_init(struct proc_dir_entry *parent_procdir) |
| { |
| int err; |
| |
| iface_stat_procdir = proc_mkdir(iface_stat_procdirname, parent_procdir); |
| if (!iface_stat_procdir) { |
| pr_err("qtaguid: iface_stat: init failed to create proc entry\n"); |
| err = -1; |
| goto err; |
| } |
| |
| iface_stat_all_procfile = create_proc_entry(iface_stat_all_procfilename, |
| proc_iface_perms, |
| parent_procdir); |
| if (!iface_stat_all_procfile) { |
| pr_err("qtaguid: iface_stat: init " |
| " failed to create stat_old proc entry\n"); |
| err = -1; |
| goto err_zap_entry; |
| } |
| iface_stat_all_procfile->read_proc = iface_stat_fmt_proc_read; |
| iface_stat_all_procfile->data = (void *)1; /* fmt1 */ |
| |
| iface_stat_fmt_procfile = create_proc_entry(iface_stat_fmt_procfilename, |
| proc_iface_perms, |
| parent_procdir); |
| if (!iface_stat_fmt_procfile) { |
| pr_err("qtaguid: iface_stat: init " |
| " failed to create stat_all proc entry\n"); |
| err = -1; |
| goto err_zap_all_stats_entry; |
| } |
| iface_stat_fmt_procfile->read_proc = iface_stat_fmt_proc_read; |
| iface_stat_fmt_procfile->data = (void *)2; /* fmt2 */ |
| |
| |
| err = register_netdevice_notifier(&iface_netdev_notifier_blk); |
| if (err) { |
| pr_err("qtaguid: iface_stat: init " |
| "failed to register dev event handler\n"); |
| goto err_zap_all_stats_entries; |
| } |
| err = register_inetaddr_notifier(&iface_inetaddr_notifier_blk); |
| if (err) { |
| pr_err("qtaguid: iface_stat: init " |
| "failed to register ipv4 dev event handler\n"); |
| goto err_unreg_nd; |
| } |
| |
| err = register_inet6addr_notifier(&iface_inet6addr_notifier_blk); |
| if (err) { |
| pr_err("qtaguid: iface_stat: init " |
| "failed to register ipv6 dev event handler\n"); |
| goto err_unreg_ip4_addr; |
| } |
| return 0; |
| |
| err_unreg_ip4_addr: |
| unregister_inetaddr_notifier(&iface_inetaddr_notifier_blk); |
| err_unreg_nd: |
| unregister_netdevice_notifier(&iface_netdev_notifier_blk); |
| err_zap_all_stats_entries: |
| remove_proc_entry(iface_stat_fmt_procfilename, parent_procdir); |
| err_zap_all_stats_entry: |
| remove_proc_entry(iface_stat_all_procfilename, parent_procdir); |
| err_zap_entry: |
| remove_proc_entry(iface_stat_procdirname, parent_procdir); |
| err: |
| return err; |
| } |
| |
| static struct sock *qtaguid_find_sk(const struct sk_buff *skb, |
| struct xt_action_param *par) |
| { |
| struct sock *sk; |
| unsigned int hook_mask = (1 << par->hooknum); |
| |
| MT_DEBUG("qtaguid: find_sk(skb=%p) hooknum=%d family=%d\n", skb, |
| par->hooknum, par->family); |
| |
| /* |
| * Let's not abuse the the xt_socket_get*_sk(), or else it will |
| * return garbage SKs. |
| */ |
| if (!(hook_mask & XT_SOCKET_SUPPORTED_HOOKS)) |
| return NULL; |
| |
| switch (par->family) { |
| case NFPROTO_IPV6: |
| sk = xt_socket_get6_sk(skb, par); |
| break; |
| case NFPROTO_IPV4: |
| sk = xt_socket_get4_sk(skb, par); |
| break; |
| default: |
| return NULL; |
| } |
| |
| /* |
| * Seems to be issues on the file ptr for TCP_TIME_WAIT SKs. |
| * http://kerneltrap.org/mailarchive/linux-netdev/2010/10/21/6287959 |
| * Not fixed in 3.0-r3 :( |
| */ |
| if (sk) { |
| MT_DEBUG("qtaguid: %p->sk_proto=%u " |
| "->sk_state=%d\n", sk, sk->sk_protocol, sk->sk_state); |
| if (sk->sk_state == TCP_TIME_WAIT) { |
| xt_socket_put_sk(sk); |
| sk = NULL; |
| } |
| } |
| return sk; |
| } |
| |
| static void account_for_uid(const struct sk_buff *skb, |
| const struct sock *alternate_sk, uid_t uid, |
| struct xt_action_param *par) |
| { |
| const struct net_device *el_dev; |
| |
| if (!skb->dev) { |
| MT_DEBUG("qtaguid[%d]: no skb->dev\n", par->hooknum); |
| el_dev = par->in ? : par->out; |
| } else { |
| const struct net_device *other_dev; |
| el_dev = skb->dev; |
| other_dev = par->in ? : par->out; |
| if (el_dev != other_dev) { |
| MT_DEBUG("qtaguid[%d]: skb->dev=%p %s vs " |
| "par->(in/out)=%p %s\n", |
| par->hooknum, el_dev, el_dev->name, other_dev, |
| other_dev->name); |
| } |
| } |
| |
| if (unlikely(!el_dev)) { |
| pr_info("qtaguid[%d]: no par->in/out?!!\n", par->hooknum); |
| } else if (unlikely(!el_dev->name)) { |
| pr_info("qtaguid[%d]: no dev->name?!!\n", par->hooknum); |
| } else { |
| int proto = ipx_proto(skb, par); |
| MT_DEBUG("qtaguid[%d]: dev name=%s type=%d fam=%d proto=%d\n", |
| par->hooknum, el_dev->name, el_dev->type, |
| par->family, proto); |
| |
| if_tag_stat_update(el_dev->name, uid, |
| skb->sk ? skb->sk : alternate_sk, |
| par->in ? IFS_RX : IFS_TX, |
| proto, skb->len); |
| } |
| } |
| |
| static bool qtaguid_mt(const struct sk_buff *skb, struct xt_action_param *par) |
| { |
| const struct xt_qtaguid_match_info *info = par->matchinfo; |
| const struct file *filp; |
| bool got_sock = false; |
| struct sock *sk; |
| uid_t sock_uid; |
| bool res; |
| |
| if (unlikely(module_passive)) |
| return (info->match ^ info->invert) == 0; |
| |
| MT_DEBUG("qtaguid[%d]: entered skb=%p par->in=%p/out=%p fam=%d\n", |
| par->hooknum, skb, par->in, par->out, par->family); |
| |
| atomic64_inc(&qtu_events.match_calls); |
| if (skb == NULL) { |
| res = (info->match ^ info->invert) == 0; |
| goto ret_res; |
| } |
| |
| switch (par->hooknum) { |
| case NF_INET_PRE_ROUTING: |
| case NF_INET_POST_ROUTING: |
| atomic64_inc(&qtu_events.match_calls_prepost); |
| iface_stat_update_from_skb(skb, par); |
| /* |
| * We are done in pre/post. The skb will get processed |
| * further alter. |
| */ |
| res = (info->match ^ info->invert); |
| goto ret_res; |
| break; |
| /* default: Fall through and do UID releated work */ |
| } |
| |
| sk = skb->sk; |
| if (sk && sk->sk_state == TCP_TIME_WAIT) |
| sk = NULL; |
| if (sk == NULL) { |
| /* |
| * A missing sk->sk_socket happens when packets are in-flight |
| * and the matching socket is already closed and gone. |
| */ |
| sk = qtaguid_find_sk(skb, par); |
| /* |
| * If we got the socket from the find_sk(), we will need to put |
| * it back, as nf_tproxy_get_sock_v4() got it. |
| */ |
| got_sock = sk; |
| if (sk) |
| atomic64_inc(&qtu_events.match_found_sk_in_ct); |
| else |
| atomic64_inc(&qtu_events.match_found_no_sk_in_ct); |
| } else { |
| atomic64_inc(&qtu_events.match_found_sk); |
| } |
| MT_DEBUG("qtaguid[%d]: sk=%p got_sock=%d fam=%d proto=%d\n", |
| par->hooknum, sk, got_sock, par->family, ipx_proto(skb, par)); |
| if (sk != NULL) { |
| MT_DEBUG("qtaguid[%d]: sk=%p->sk_socket=%p->file=%p\n", |
| par->hooknum, sk, sk->sk_socket, |
| sk->sk_socket ? sk->sk_socket->file : (void *)-1LL); |
| filp = sk->sk_socket ? sk->sk_socket->file : NULL; |
| MT_DEBUG("qtaguid[%d]: filp...uid=%u\n", |
| par->hooknum, filp ? filp->f_cred->fsuid : -1); |
| } |
| |
| if (sk == NULL || sk->sk_socket == NULL) { |
| /* |
| * Here, the qtaguid_find_sk() using connection tracking |
| * couldn't find the owner, so for now we just count them |
| * against the system. |
| */ |
| /* |
| * TODO: unhack how to force just accounting. |
| * For now we only do iface stats when the uid-owner is not |
| * requested. |
| */ |
| if (!(info->match & XT_QTAGUID_UID)) |
| account_for_uid(skb, sk, 0, par); |
| MT_DEBUG("qtaguid[%d]: leaving (sk?sk->sk_socket)=%p\n", |
| par->hooknum, |
| sk ? sk->sk_socket : NULL); |
| res = (info->match ^ info->invert) == 0; |
| atomic64_inc(&qtu_events.match_no_sk); |
| goto put_sock_ret_res; |
| } else if (info->match & info->invert & XT_QTAGUID_SOCKET) { |
| res = false; |
| goto put_sock_ret_res; |
| } |
| filp = sk->sk_socket->file; |
| if (filp == NULL) { |
| MT_DEBUG("qtaguid[%d]: leaving filp=NULL\n", par->hooknum); |
| account_for_uid(skb, sk, 0, par); |
| res = ((info->match ^ info->invert) & |
| (XT_QTAGUID_UID | XT_QTAGUID_GID)) == 0; |
| atomic64_inc(&qtu_events.match_no_sk_file); |
| goto put_sock_ret_res; |
| } |
| sock_uid = filp->f_cred->fsuid; |
| /* |
| * TODO: unhack how to force just accounting. |
| * For now we only do iface stats when the uid-owner is not requested |
| */ |
| if (!(info->match & XT_QTAGUID_UID)) |
| account_for_uid(skb, sk, sock_uid, par); |
| |
| /* |
| * The following two tests fail the match when: |
| * id not in range AND no inverted condition requested |
| * or id in range AND inverted condition requested |
| * Thus (!a && b) || (a && !b) == a ^ b |
| */ |
| if (info->match & XT_QTAGUID_UID) |
| if ((filp->f_cred->fsuid >= info->uid_min && |
| filp->f_cred->fsuid <= info->uid_max) ^ |
| !(info->invert & XT_QTAGUID_UID)) { |
| MT_DEBUG("qtaguid[%d]: leaving uid not matching\n", |
| par->hooknum); |
| res = false; |
| goto put_sock_ret_res; |
| } |
| if (info->match & XT_QTAGUID_GID) |
| if ((filp->f_cred->fsgid >= info->gid_min && |
| filp->f_cred->fsgid <= info->gid_max) ^ |
| !(info->invert & XT_QTAGUID_GID)) { |
| MT_DEBUG("qtaguid[%d]: leaving gid not matching\n", |
| par->hooknum); |
| res = false; |
| goto put_sock_ret_res; |
| } |
| |
| MT_DEBUG("qtaguid[%d]: leaving matched\n", par->hooknum); |
| res = true; |
| |
| put_sock_ret_res: |
| if (got_sock) |
| xt_socket_put_sk(sk); |
| ret_res: |
| MT_DEBUG("qtaguid[%d]: left %d\n", par->hooknum, res); |
| return res; |
| } |
| |
| #ifdef DDEBUG |
| /* This function is not in xt_qtaguid_print.c because of locks visibility */ |
| static void prdebug_full_state(int indent_level, const char *fmt, ...) |
| { |
| va_list args; |
| char *fmt_buff; |
| char *buff; |
| |
| if (!unlikely(qtaguid_debug_mask & DDEBUG_MASK)) |
| return; |
| |
| fmt_buff = kasprintf(GFP_ATOMIC, |
| "qtaguid: %s(): %s {\n", __func__, fmt); |
| BUG_ON(!fmt_buff); |
| va_start(args, fmt); |
| buff = kvasprintf(GFP_ATOMIC, |
| fmt_buff, args); |
| BUG_ON(!buff); |
| pr_debug("%s", buff); |
| kfree(fmt_buff); |
| kfree(buff); |
| va_end(args); |
| |
| spin_lock_bh(&sock_tag_list_lock); |
| prdebug_sock_tag_tree(indent_level, &sock_tag_tree); |
| spin_unlock_bh(&sock_tag_list_lock); |
| |
| spin_lock_bh(&sock_tag_list_lock); |
| spin_lock_bh(&uid_tag_data_tree_lock); |
| prdebug_uid_tag_data_tree(indent_level, &uid_tag_data_tree); |
| prdebug_proc_qtu_data_tree(indent_level, &proc_qtu_data_tree); |
| spin_unlock_bh(&uid_tag_data_tree_lock); |
| spin_unlock_bh(&sock_tag_list_lock); |
| |
| spin_lock_bh(&iface_stat_list_lock); |
| prdebug_iface_stat_list(indent_level, &iface_stat_list); |
| spin_unlock_bh(&iface_stat_list_lock); |
| |
| pr_debug("qtaguid: %s(): }\n", __func__); |
| } |
| #else |
| static void prdebug_full_state(int indent_level, const char *fmt, ...) {} |
| #endif |
| |
| /* |
| * Procfs reader to get all active socket tags using style "1)" as described in |
| * fs/proc/generic.c |
| */ |
| static int qtaguid_ctrl_proc_read(char *page, char **num_items_returned, |
| off_t items_to_skip, int char_count, int *eof, |
| void *data) |
| { |
| char *outp = page; |
| int len; |
| uid_t uid; |
| struct rb_node *node; |
| struct sock_tag *sock_tag_entry; |
| int item_index = 0; |
| int indent_level = 0; |
| long f_count; |
| |
| if (unlikely(module_passive)) { |
| *eof = 1; |
| return 0; |
| } |
| |
| if (*eof) |
| return 0; |
| |
| CT_DEBUG("qtaguid: proc ctrl pid=%u tgid=%u uid=%u " |
| "page=%p off=%ld char_count=%d *eof=%d\n", |
| current->pid, current->tgid, current_fsuid(), |
| page, items_to_skip, char_count, *eof); |
| |
| spin_lock_bh(&sock_tag_list_lock); |
| for (node = rb_first(&sock_tag_tree); |
| node; |
| node = rb_next(node)) { |
| if (item_index++ < items_to_skip) |
| continue; |
| sock_tag_entry = rb_entry(node, struct sock_tag, sock_node); |
| uid = get_uid_from_tag(sock_tag_entry->tag); |
| CT_DEBUG("qtaguid: proc_read(): sk=%p tag=0x%llx (uid=%u) " |
| "pid=%u\n", |
| sock_tag_entry->sk, |
| sock_tag_entry->tag, |
| uid, |
| sock_tag_entry->pid |
| ); |
| f_count = atomic_long_read( |
| &sock_tag_entry->socket->file->f_count); |
| len = snprintf(outp, char_count, |
| "sock=%p tag=0x%llx (uid=%u) pid=%u " |
| "f_count=%lu\n", |
| sock_tag_entry->sk, |
| sock_tag_entry->tag, uid, |
| sock_tag_entry->pid, f_count); |
| if (len >= char_count) { |
| spin_unlock_bh(&sock_tag_list_lock); |
| *outp = '\0'; |
| return outp - page; |
| } |
| outp += len; |
| char_count -= len; |
| (*num_items_returned)++; |
| } |
| spin_unlock_bh(&sock_tag_list_lock); |
| |
| if (item_index++ >= items_to_skip) { |
| len = snprintf(outp, char_count, |
| "events: sockets_tagged=%llu " |
| "sockets_untagged=%llu " |
| "counter_set_changes=%llu " |
| "delete_cmds=%llu " |
| "iface_events=%llu " |
| "match_calls=%llu " |
| "match_calls_prepost=%llu " |
| "match_found_sk=%llu " |
| "match_found_sk_in_ct=%llu " |
| "match_found_no_sk_in_ct=%llu " |
| "match_no_sk=%llu " |
| "match_no_sk_file=%llu\n", |
| atomic64_read(&qtu_events.sockets_tagged), |
| atomic64_read(&qtu_events.sockets_untagged), |
| atomic64_read(&qtu_events.counter_set_changes), |
| atomic64_read(&qtu_events.delete_cmds), |
| atomic64_read(&qtu_events.iface_events), |
| atomic64_read(&qtu_events.match_calls), |
| atomic64_read(&qtu_events.match_calls_prepost), |
| atomic64_read(&qtu_events.match_found_sk), |
| atomic64_read(&qtu_events.match_found_sk_in_ct), |
| atomic64_read( |
| &qtu_events.match_found_no_sk_in_ct), |
| atomic64_read(&qtu_events.match_no_sk), |
| atomic64_read(&qtu_events.match_no_sk_file)); |
| if (len >= char_count) { |
| *outp = '\0'; |
| return outp - page; |
| } |
| outp += len; |
| char_count -= len; |
| (*num_items_returned)++; |
| } |
| |
| /* Count the following as part of the last item_index */ |
| if (item_index > items_to_skip) { |
| prdebug_full_state(indent_level, "proc ctrl"); |
| } |
| |
| *eof = 1; |
| return outp - page; |
| } |
| |
| /* |
| * Delete socket tags, and stat tags associated with a given |
| * accouting tag and uid. |
| */ |
| static int ctrl_cmd_delete(const char *input) |
| { |
| char cmd; |
| uid_t uid; |
| uid_t entry_uid; |
| tag_t acct_tag; |
| tag_t tag; |
| int res, argc; |
| struct iface_stat *iface_entry; |
| struct rb_node *node; |
| struct sock_tag *st_entry; |
| struct rb_root st_to_free_tree = RB_ROOT; |
| struct tag_stat *ts_entry; |
| struct tag_counter_set *tcs_entry; |
| struct tag_ref *tr_entry; |
| struct uid_tag_data *utd_entry; |
| |
| argc = sscanf(input, "%c %llu %u", &cmd, &acct_tag, &uid); |
| CT_DEBUG("qtaguid: ctrl_delete(%s): argc=%d cmd=%c " |
| "user_tag=0x%llx uid=%u\n", input, argc, cmd, |
| acct_tag, uid); |
| if (argc < 2) { |
| res = -EINVAL; |
| goto err; |
| } |
| if (!valid_atag(acct_tag)) { |
| pr_info("qtaguid: ctrl_delete(%s): invalid tag\n", input); |
| res = -EINVAL; |
| goto err; |
| } |
| if (argc < 3) { |
| uid = current_fsuid(); |
| } else if (!can_impersonate_uid(uid)) { |
| pr_info("qtaguid: ctrl_delete(%s): " |
| "insufficient priv from pid=%u tgid=%u uid=%u\n", |
| input, current->pid, current->tgid, current_fsuid()); |
| res = -EPERM; |
| goto err; |
| } |
| |
| tag = combine_atag_with_uid(acct_tag, uid); |
| CT_DEBUG("qtaguid: ctrl_delete(%s): " |
| "looking for tag=0x%llx (uid=%u)\n", |
| input, tag, uid); |
| |
| /* Delete socket tags */ |
| spin_lock_bh(&sock_tag_list_lock); |
| node = rb_first(&sock_tag_tree); |
| while (node) { |
| st_entry = rb_entry(node, struct sock_tag, sock_node); |
| entry_uid = get_uid_from_tag(st_entry->tag); |
| node = rb_next(node); |
| if (entry_uid != uid) |
| continue; |
| |
| CT_DEBUG("qtaguid: ctrl_delete(%s): st tag=0x%llx (uid=%u)\n", |
| input, st_entry->tag, entry_uid); |
| |
| if (!acct_tag || st_entry->tag == tag) { |
| rb_erase(&st_entry->sock_node, &sock_tag_tree); |
| /* Can't sockfd_put() within spinlock, do it later. */ |
| sock_tag_tree_insert(st_entry, &st_to_free_tree); |
| tr_entry = lookup_tag_ref(st_entry->tag, NULL); |
| BUG_ON(tr_entry->num_sock_tags <= 0); |
| tr_entry->num_sock_tags--; |
| /* |
| * TODO: remove if, and start failing. |
| * This is a hack to work around the fact that in some |
| * places we have "if (IS_ERR_OR_NULL(pqd_entry))" |
| * and are trying to work around apps |
| * that didn't open the /dev/xt_qtaguid. |
| */ |
| if (st_entry->list.next && st_entry->list.prev) |
| list_del(&st_entry->list); |
| } |
| } |
| spin_unlock_bh(&sock_tag_list_lock); |
| |
| sock_tag_tree_erase(&st_to_free_tree); |
| |
| /* Delete tag counter-sets */ |
| spin_lock_bh(&tag_counter_set_list_lock); |
| /* Counter sets are only on the uid tag, not full tag */ |
| tcs_entry = tag_counter_set_tree_search(&tag_counter_set_tree, tag); |
| if (tcs_entry) { |
| CT_DEBUG("qtaguid: ctrl_delete(%s): " |
| "erase tcs: tag=0x%llx (uid=%u) set=%d\n", |
| input, |
| tcs_entry->tn.tag, |
| get_uid_from_tag(tcs_entry->tn.tag), |
| tcs_entry->active_set); |
| rb_erase(&tcs_entry->tn.node, &tag_counter_set_tree); |
| kfree(tcs_entry); |
| } |
| spin_unlock_bh(&tag_counter_set_list_lock); |
| |
| /* |
| * If acct_tag is 0, then all entries belonging to uid are |
| * erased. |
| */ |
| spin_lock_bh(&iface_stat_list_lock); |
| list_for_each_entry(iface_entry, &iface_stat_list, list) { |
| spin_lock_bh(&iface_entry->tag_stat_list_lock); |
| node = rb_first(&iface_entry->tag_stat_tree); |
| while (node) { |
| ts_entry = rb_entry(node, struct tag_stat, tn.node); |
| entry_uid = get_uid_from_tag(ts_entry->tn.tag); |
| node = rb_next(node); |
| |
| CT_DEBUG("qtaguid: ctrl_delete(%s): " |
| "ts tag=0x%llx (uid=%u)\n", |
| input, ts_entry->tn.tag, entry_uid); |
| |
| if (entry_uid != uid) |
| continue; |
| if (!acct_tag || ts_entry->tn.tag == tag) { |
| CT_DEBUG("qtaguid: ctrl_delete(%s): " |
| "erase ts: %s 0x%llx %u\n", |
| input, iface_entry->ifname, |
| get_atag_from_tag(ts_entry->tn.tag), |
| entry_uid); |
| rb_erase(&ts_entry->tn.node, |
| &iface_entry->tag_stat_tree); |
| kfree(ts_entry); |
| } |
| } |
| spin_unlock_bh(&iface_entry->tag_stat_list_lock); |
| } |
| spin_unlock_bh(&iface_stat_list_lock); |
| |
| /* Cleanup the uid_tag_data */ |
| spin_lock_bh(&uid_tag_data_tree_lock); |
| node = rb_first(&uid_tag_data_tree); |
| while (node) { |
| utd_entry = rb_entry(node, struct uid_tag_data, node); |
| entry_uid = utd_entry->uid; |
| node = rb_next(node); |
| |
| CT_DEBUG("qtaguid: ctrl_delete(%s): " |
| "utd uid=%u\n", |
| input, entry_uid); |
| |
| if (entry_uid != uid) |
| continue; |
| /* |
| * Go over the tag_refs, and those that don't have |
| * sock_tags using them are freed. |
| */ |
| put_tag_ref_tree(tag, utd_entry); |
| put_utd_entry(utd_entry); |
| } |
| spin_unlock_bh(&uid_tag_data_tree_lock); |
| |
| atomic64_inc(&qtu_events.delete_cmds); |
| res = 0; |
| |
| err: |
| return res; |
| } |
| |
| static int ctrl_cmd_counter_set(const char *input) |
| { |
| char cmd; |
| uid_t uid = 0; |
| tag_t tag; |
| int res, argc; |
| struct tag_counter_set *tcs; |
| int counter_set; |
| |
| argc = sscanf(input, "%c %d %u", &cmd, &counter_set, &uid); |
| CT_DEBUG("qtaguid: ctrl_counterset(%s): argc=%d cmd=%c " |
| "set=%d uid=%u\n", input, argc, cmd, |
| counter_set, uid); |
| if (argc != 3) { |
| res = -EINVAL; |
| goto err; |
| } |
| if (counter_set < 0 || counter_set >= IFS_MAX_COUNTER_SETS) { |
| pr_info("qtaguid: ctrl_counterset(%s): invalid counter_set range\n", |
| input); |
| res = -EINVAL; |
| goto err; |
| } |
| if (!can_manipulate_uids()) { |
| pr_info("qtaguid: ctrl_counterset(%s): " |
| "insufficient priv from pid=%u tgid=%u uid=%u\n", |
| input, current->pid, current->tgid, current_fsuid()); |
| res = -EPERM; |
| goto err; |
| } |
| |
| tag = make_tag_from_uid(uid); |
| spin_lock_bh(&tag_counter_set_list_lock); |
| tcs = tag_counter_set_tree_search(&tag_counter_set_tree, tag); |
| if (!tcs) { |
| tcs = kzalloc(sizeof(*tcs), GFP_ATOMIC); |
| if (!tcs) { |
| spin_unlock_bh(&tag_counter_set_list_lock); |
| pr_err("qtaguid: ctrl_counterset(%s): " |
| "failed to alloc counter set\n", |
| input); |
| res = -ENOMEM; |
| goto err; |
| } |
| tcs->tn.tag = tag; |
| tag_counter_set_tree_insert(tcs, &tag_counter_set_tree); |
| CT_DEBUG("qtaguid: ctrl_counterset(%s): added tcs tag=0x%llx " |
| "(uid=%u) set=%d\n", |
| input, tag, get_uid_from_tag(tag), counter_set); |
| } |
| tcs->active_set = counter_set; |
| spin_unlock_bh(&tag_counter_set_list_lock); |
| atomic64_inc(&qtu_events.counter_set_changes); |
| res = 0; |
| |
| err: |
| return res; |
| } |
| |
| static int ctrl_cmd_tag(const char *input) |
| { |
| char cmd; |
| int sock_fd = 0; |
| uid_t uid = 0; |
| tag_t acct_tag = make_atag_from_value(0); |
| tag_t full_tag; |
| struct socket *el_socket; |
| int res, argc; |
| struct sock_tag *sock_tag_entry; |
| struct tag_ref *tag_ref_entry; |
| struct uid_tag_data *uid_tag_data_entry; |
| struct proc_qtu_data *pqd_entry; |
| |
| /* Unassigned args will get defaulted later. */ |
| argc = sscanf(input, "%c %d %llu %u", &cmd, &sock_fd, &acct_tag, &uid); |
| CT_DEBUG("qtaguid: ctrl_tag(%s): argc=%d cmd=%c sock_fd=%d " |
| "acct_tag=0x%llx uid=%u\n", input, argc, cmd, sock_fd, |
| acct_tag, uid); |
| if (argc < 2) { |
| res = -EINVAL; |
| goto err; |
| } |
| el_socket = sockfd_lookup(sock_fd, &res); /* This locks the file */ |
| if (!el_socket) { |
| pr_info("qtaguid: ctrl_tag(%s): failed to lookup" |
| " sock_fd=%d err=%d pid=%u tgid=%u uid=%u\n", |
| input, sock_fd, res, current->pid, current->tgid, |
| current_fsuid()); |
| goto err; |
| } |
| CT_DEBUG("qtaguid: ctrl_tag(%s): socket->...->f_count=%ld ->sk=%p\n", |
| input, atomic_long_read(&el_socket->file->f_count), |
| el_socket->sk); |
| if (argc < 3) { |
| acct_tag = make_atag_from_value(0); |
| } else if (!valid_atag(acct_tag)) { |
| pr_info("qtaguid: ctrl_tag(%s): invalid tag\n", input); |
| res = -EINVAL; |
| goto err_put; |
| } |
| CT_DEBUG("qtaguid: ctrl_tag(%s): " |
| "pid=%u tgid=%u uid=%u euid=%u fsuid=%u " |
| "in_group=%d in_egroup=%d\n", |
| input, current->pid, current->tgid, current_uid(), |
| current_euid(), current_fsuid(), |
| in_group_p(proc_ctrl_write_gid), |
| in_egroup_p(proc_ctrl_write_gid)); |
| if (argc < 4) { |
| uid = current_fsuid(); |
| } else if (!can_impersonate_uid(uid)) { |
| pr_info("qtaguid: ctrl_tag(%s): " |
| "insufficient priv from pid=%u tgid=%u uid=%u\n", |
| input, current->pid, current->tgid, current_fsuid()); |
| res = -EPERM; |
| goto err_put; |
| } |
| full_tag = combine_atag_with_uid(acct_tag, uid); |
| |
| spin_lock_bh(&sock_tag_list_lock); |
| sock_tag_entry = get_sock_stat_nl(el_socket->sk); |
| tag_ref_entry = get_tag_ref(full_tag, &uid_tag_data_entry); |
| if (IS_ERR(tag_ref_entry)) { |
| res = PTR_ERR(tag_ref_entry); |
| spin_unlock_bh(&sock_tag_list_lock); |
| goto err_put; |
| } |
| tag_ref_entry->num_sock_tags++; |
| if (sock_tag_entry) { |
| struct tag_ref *prev_tag_ref_entry; |
| |
| CT_DEBUG("qtaguid: ctrl_tag(%s): retag for sk=%p " |
| "st@%p ...->f_count=%ld\n", |
| input, el_socket->sk, sock_tag_entry, |
| atomic_long_read(&el_socket->file->f_count)); |
| /* |
| * This is a re-tagging, so release the sock_fd that was |
| * locked at the time of the 1st tagging. |
| * There is still the ref from this call's sockfd_lookup() so |
| * it can be done within the spinlock. |
| */ |
| sockfd_put(sock_tag_entry->socket); |
| prev_tag_ref_entry = lookup_tag_ref(sock_tag_entry->tag, |
| &uid_tag_data_entry); |
| BUG_ON(IS_ERR_OR_NULL(prev_tag_ref_entry)); |
| BUG_ON(prev_tag_ref_entry->num_sock_tags <= 0); |
| prev_tag_ref_entry->num_sock_tags--; |
| sock_tag_entry->tag = full_tag; |
| } else { |
| CT_DEBUG("qtaguid: ctrl_tag(%s): newtag for sk=%p\n", |
| input, el_socket->sk); |
| sock_tag_entry = kzalloc(sizeof(*sock_tag_entry), |
| GFP_ATOMIC); |
| if (!sock_tag_entry) { |
| pr_err("qtaguid: ctrl_tag(%s): " |
| "socket tag alloc failed\n", |
| input); |
| spin_unlock_bh(&sock_tag_list_lock); |
| res = -ENOMEM; |
| goto err_tag_unref_put; |
| } |
| sock_tag_entry->sk = el_socket->sk; |
| sock_tag_entry->socket = el_socket; |
| sock_tag_entry->pid = current->tgid; |
| sock_tag_entry->tag = combine_atag_with_uid(acct_tag, |
| uid); |
| spin_lock_bh(&uid_tag_data_tree_lock); |
| pqd_entry = proc_qtu_data_tree_search( |
| &proc_qtu_data_tree, current->tgid); |
| /* |
| * TODO: remove if, and start failing. |
| * At first, we want to catch user-space code that is not |
| * opening the /dev/xt_qtaguid. |
| */ |
| if (IS_ERR_OR_NULL(pqd_entry)) |
| pr_warn_once( |
| "qtaguid: %s(): " |
| "User space forgot to open /dev/xt_qtaguid? " |
| "pid=%u tgid=%u uid=%u\n", __func__, |
| current->pid, current->tgid, |
| current_fsuid()); |
| else |
| list_add(&sock_tag_entry->list, |
| &pqd_entry->sock_tag_list); |
| spin_unlock_bh(&uid_tag_data_tree_lock); |
| |
| sock_tag_tree_insert(sock_tag_entry, &sock_tag_tree); |
| atomic64_inc(&qtu_events.sockets_tagged); |
| } |
| spin_unlock_bh(&sock_tag_list_lock); |
| /* We keep the ref to the socket (file) until it is untagged */ |
| CT_DEBUG("qtaguid: ctrl_tag(%s): done st@%p ...->f_count=%ld\n", |
| input, sock_tag_entry, |
| atomic_long_read(&el_socket->file->f_count)); |
| return 0; |
| |
| err_tag_unref_put: |
| BUG_ON(tag_ref_entry->num_sock_tags <= 0); |
| tag_ref_entry->num_sock_tags--; |
| free_tag_ref_from_utd_entry(tag_ref_entry, uid_tag_data_entry); |
| err_put: |
| CT_DEBUG("qtaguid: ctrl_tag(%s): done. ...->f_count=%ld\n", |
| input, atomic_long_read(&el_socket->file->f_count) - 1); |
| /* Release the sock_fd that was grabbed by sockfd_lookup(). */ |
| sockfd_put(el_socket); |
| return res; |
| |
| err: |
| CT_DEBUG("qtaguid: ctrl_tag(%s): done.\n", input); |
| return res; |
| } |
| |
| static int ctrl_cmd_untag(const char *input) |
| { |
| char cmd; |
| int sock_fd = 0; |
| struct socket *el_socket; |
| int res, argc; |
| struct sock_tag *sock_tag_entry; |
| struct tag_ref *tag_ref_entry; |
| struct uid_tag_data *utd_entry; |
| struct proc_qtu_data *pqd_entry; |
| |
| argc = sscanf(input, "%c %d", &cmd, &sock_fd); |
| CT_DEBUG("qtaguid: ctrl_untag(%s): argc=%d cmd=%c sock_fd=%d\n", |
| input, argc, cmd, sock_fd); |
| if (argc < 2) { |
| res = -EINVAL; |
| goto err; |
| } |
| el_socket = sockfd_lookup(sock_fd, &res); /* This locks the file */ |
| if (!el_socket) { |
| pr_info("qtaguid: ctrl_untag(%s): failed to lookup" |
| " sock_fd=%d err=%d pid=%u tgid=%u uid=%u\n", |
| input, sock_fd, res, current->pid, current->tgid, |
| current_fsuid()); |
| goto err; |
| } |
| CT_DEBUG("qtaguid: ctrl_untag(%s): socket->...->f_count=%ld ->sk=%p\n", |
| input, atomic_long_read(&el_socket->file->f_count), |
| el_socket->sk); |
| spin_lock_bh(&sock_tag_list_lock); |
| sock_tag_entry = get_sock_stat_nl(el_socket->sk); |
| if (!sock_tag_entry) { |
| spin_unlock_bh(&sock_tag_list_lock); |
| res = -EINVAL; |
| goto err_put; |
| } |
| /* |
| * The socket already belongs to the current process |
| * so it can do whatever it wants to it. |
| */ |
| rb_erase(&sock_tag_entry->sock_node, &sock_tag_tree); |
| |
| tag_ref_entry = lookup_tag_ref(sock_tag_entry->tag, &utd_entry); |
| BUG_ON(!tag_ref_entry); |
| BUG_ON(tag_ref_entry->num_sock_tags <= 0); |
| spin_lock_bh(&uid_tag_data_tree_lock); |
| pqd_entry = proc_qtu_data_tree_search( |
| &proc_qtu_data_tree, current->tgid); |
| /* |
| * TODO: remove if, and start failing. |
| * At first, we want to catch user-space code that is not |
| * opening the /dev/xt_qtaguid. |
| */ |
| if (IS_ERR_OR_NULL(pqd_entry)) |
| pr_warn_once("qtaguid: %s(): " |
| "User space forgot to open /dev/xt_qtaguid? " |
| "pid=%u tgid=%u uid=%u\n", __func__, |
| current->pid, current->tgid, current_fsuid()); |
| else |
| list_del(&sock_tag_entry->list); |
| spin_unlock_bh(&uid_tag_data_tree_lock); |
| /* |
| * We don't free tag_ref from the utd_entry here, |
| * only during a cmd_delete(). |
| */ |
| tag_ref_entry->num_sock_tags--; |
| spin_unlock_bh(&sock_tag_list_lock); |
| /* |
| * Release the sock_fd that was grabbed at tag time, |
| * and once more for the sockfd_lookup() here. |
| */ |
| sockfd_put(sock_tag_entry->socket); |
| CT_DEBUG("qtaguid: ctrl_untag(%s): done. st@%p ...->f_count=%ld\n", |
| input, sock_tag_entry, |
| atomic_long_read(&el_socket->file->f_count) - 1); |
| sockfd_put(el_socket); |
| |
| kfree(sock_tag_entry); |
| atomic64_inc(&qtu_events.sockets_untagged); |
| |
| return 0; |
| |
| err_put: |
| CT_DEBUG("qtaguid: ctrl_untag(%s): done. socket->...->f_count=%ld\n", |
| input, atomic_long_read(&el_socket->file->f_count) - 1); |
| /* Release the sock_fd that was grabbed by sockfd_lookup(). */ |
| sockfd_put(el_socket); |
| return res; |
| |
| err: |
| CT_DEBUG("qtaguid: ctrl_untag(%s): done.\n", input); |
| return res; |
| } |
| |
| static int qtaguid_ctrl_parse(const char *input, int count) |
| { |
| char cmd; |
| int res; |
| |
| CT_DEBUG("qtaguid: ctrl(%s): pid=%u tgid=%u uid=%u\n", |
| input, current->pid, current->tgid, current_fsuid()); |
| |
| cmd = input[0]; |
| /* Collect params for commands */ |
| switch (cmd) { |
| case 'd': |
| res = ctrl_cmd_delete(input); |
| break; |
| |
| case 's': |
| res = ctrl_cmd_counter_set(input); |
| break; |
| |
| case 't': |
| res = ctrl_cmd_tag(input); |
| break; |
| |
| case 'u': |
| res = ctrl_cmd_untag(input); |
| break; |
| |
| default: |
| res = -EINVAL; |
| goto err; |
| } |
| if (!res) |
| res = count; |
| err: |
| CT_DEBUG("qtaguid: ctrl(%s): res=%d\n", input, res); |
| return res; |
| } |
| |
| #define MAX_QTAGUID_CTRL_INPUT_LEN 255 |
| static int qtaguid_ctrl_proc_write(struct file *file, const char __user *buffer, |
| unsigned long count, void *data) |
| { |
| char input_buf[MAX_QTAGUID_CTRL_INPUT_LEN]; |
| |
| if (unlikely(module_passive)) |
| return count; |
| |
| if (count >= MAX_QTAGUID_CTRL_INPUT_LEN) |
| return -EINVAL; |
| |
| if (copy_from_user(input_buf, buffer, count)) |
| return -EFAULT; |
| |
| input_buf[count] = '\0'; |
| return qtaguid_ctrl_parse(input_buf, count); |
| } |
| |
| struct proc_print_info { |
| char *outp; |
| char **num_items_returned; |
| struct iface_stat *iface_entry; |
| struct tag_stat *ts_entry; |
| int item_index; |
| int items_to_skip; |
| int char_count; |
| }; |
| |
| static int pp_stats_line(struct proc_print_info *ppi, int cnt_set) |
| { |
| int len; |
| struct data_counters *cnts; |
| |
| if (!ppi->item_index) { |
| if (ppi->item_index++ < ppi->items_to_skip) |
| return 0; |
| len = snprintf(ppi->outp, ppi->char_count, |
| "idx iface acct_tag_hex uid_tag_int cnt_set " |
| "rx_bytes rx_packets " |
| "tx_bytes tx_packets " |
| "rx_tcp_bytes rx_tcp_packets " |
| "rx_udp_bytes rx_udp_packets " |
| "rx_other_bytes rx_other_packets " |
| "tx_tcp_bytes tx_tcp_packets " |
| "tx_udp_bytes tx_udp_packets " |
| "tx_other_bytes tx_other_packets\n"); |
| } else { |
| tag_t tag = ppi->ts_entry->tn.tag; |
| uid_t stat_uid = get_uid_from_tag(tag); |
| |
| if (!can_read_other_uid_stats(stat_uid)) { |
| CT_DEBUG("qtaguid: stats line: " |
| "%s 0x%llx %u: insufficient priv " |
| "from pid=%u tgid=%u uid=%u\n", |
| ppi->iface_entry->ifname, |
| get_atag_from_tag(tag), stat_uid, |
| current->pid, current->tgid, current_fsuid()); |
| return 0; |
| } |
| if (ppi->item_index++ < ppi->items_to_skip) |
| return 0; |
| cnts = &ppi->ts_entry->counters; |
| len = snprintf( |
| ppi->outp, ppi->char_count, |
| "%d %s 0x%llx %u %u " |
| "%llu %llu " |
| "%llu %llu " |
| "%llu %llu " |
| "%llu %llu " |
| "%llu %llu " |
| "%llu %llu " |
| "%llu %llu " |
| "%llu %llu\n", |
| ppi->item_index, |
| ppi->iface_entry->ifname, |
| get_atag_from_tag(tag), |
| stat_uid, |
| cnt_set, |
| dc_sum_bytes(cnts, cnt_set, IFS_RX), |
| dc_sum_packets(cnts, cnt_set, IFS_RX), |
| dc_sum_bytes(cnts, cnt_set, IFS_TX), |
| dc_sum_packets(cnts, cnt_set, IFS_TX), |
| cnts->bpc[cnt_set][IFS_RX][IFS_TCP].bytes, |
| cnts->bpc[cnt_set][IFS_RX][IFS_TCP].packets, |
| cnts->bpc[cnt_set][IFS_RX][IFS_UDP].bytes, |
| cnts->bpc[cnt_set][IFS_RX][IFS_UDP].packets, |
| cnts->bpc[cnt_set][IFS_RX][IFS_PROTO_OTHER].bytes, |
| cnts->bpc[cnt_set][IFS_RX][IFS_PROTO_OTHER].packets, |
| cnts->bpc[cnt_set][IFS_TX][IFS_TCP].bytes, |
| cnts->bpc[cnt_set][IFS_TX][IFS_TCP].packets, |
| cnts->bpc[cnt_set][IFS_TX][IFS_UDP].bytes, |
| cnts->bpc[cnt_set][IFS_TX][IFS_UDP].packets, |
| cnts->bpc[cnt_set][IFS_TX][IFS_PROTO_OTHER].bytes, |
| cnts->bpc[cnt_set][IFS_TX][IFS_PROTO_OTHER].packets); |
| } |
| return len; |
| } |
| |
| static bool pp_sets(struct proc_print_info *ppi) |
| { |
| int len; |
| int counter_set; |
| for (counter_set = 0; counter_set < IFS_MAX_COUNTER_SETS; |
| counter_set++) { |
| len = pp_stats_line(ppi, counter_set); |
| if (len >= ppi->char_count) { |
| *ppi->outp = '\0'; |
| return false; |
| } |
| if (len) { |
| ppi->outp += len; |
| ppi->char_count -= len; |
| (*ppi->num_items_returned)++; |
| } |
| } |
| return true; |
| } |
| |
| /* |
| * Procfs reader to get all tag stats using style "1)" as described in |
| * fs/proc/generic.c |
| * Groups all protocols tx/rx bytes. |
| */ |
| static int qtaguid_stats_proc_read(char *page, char **num_items_returned, |
| off_t items_to_skip, int char_count, int *eof, |
| void *data) |
| { |
| struct proc_print_info ppi; |
| int len; |
| |
| ppi.outp = page; |
| ppi.item_index = 0; |
| ppi.char_count = char_count; |
| ppi.num_items_returned = num_items_returned; |
| ppi.items_to_skip = items_to_skip; |
| |
| if (unlikely(module_passive)) { |
| len = pp_stats_line(&ppi, 0); |
| /* The header should always be shorter than the buffer. */ |
| BUG_ON(len >= ppi.char_count); |
| (*num_items_returned)++; |
| *eof = 1; |
| return len; |
| } |
| |
| CT_DEBUG("qtaguid:proc stats pid=%u tgid=%u uid=%u " |
| "page=%p *num_items_returned=%p off=%ld " |
| "char_count=%d *eof=%d\n", |
| current->pid, current->tgid, current_fsuid(), |
| page, *num_items_returned, |
| items_to_skip, char_count, *eof); |
| |
| if (*eof) |
| return 0; |
| |
| /* The idx is there to help debug when things go belly up. */ |
| len = pp_stats_line(&ppi, 0); |
| /* Don't advance the outp unless the whole line was printed */ |
| if (len >= ppi.char_count) { |
| *ppi.outp = '\0'; |
| return ppi.outp - page; |
| } |
| if (len) { |
| ppi.outp += len; |
| ppi.char_count -= len; |
| (*num_items_returned)++; |
| } |
| |
| spin_lock_bh(&iface_stat_list_lock); |
| list_for_each_entry(ppi.iface_entry, &iface_stat_list, list) { |
| struct rb_node *node; |
| spin_lock_bh(&ppi.iface_entry->tag_stat_list_lock); |
| for (node = rb_first(&ppi.iface_entry->tag_stat_tree); |
| node; |
| node = rb_next(node)) { |
| ppi.ts_entry = rb_entry(node, struct tag_stat, tn.node); |
| if (!pp_sets(&ppi)) { |
| spin_unlock_bh( |
| &ppi.iface_entry->tag_stat_list_lock); |
| spin_unlock_bh(&iface_stat_list_lock); |
| return ppi.outp - page; |
| } |
| } |
| spin_unlock_bh(&ppi.iface_entry->tag_stat_list_lock); |
| } |
| spin_unlock_bh(&iface_stat_list_lock); |
| |
| *eof = 1; |
| return ppi.outp - page; |
| } |
| |
| /*------------------------------------------*/ |
| static int qtudev_open(struct inode *inode, struct file *file) |
| { |
| struct uid_tag_data *utd_entry; |
| struct proc_qtu_data *pqd_entry; |
| struct proc_qtu_data *new_pqd_entry; |
| int res; |
| bool utd_entry_found; |
| |
| if (unlikely(qtu_proc_handling_passive)) |
| return 0; |
| |
| DR_DEBUG("qtaguid: qtudev_open(): pid=%u tgid=%u uid=%u\n", |
| current->pid, current->tgid, current_fsuid()); |
| |
| spin_lock_bh(&uid_tag_data_tree_lock); |
| |
| /* Look for existing uid data, or alloc one. */ |
| utd_entry = get_uid_data(current_fsuid(), &utd_entry_found); |
| if (IS_ERR_OR_NULL(utd_entry)) { |
| res = PTR_ERR(utd_entry); |
| goto err; |
| } |
| |
| /* Look for existing PID based proc_data */ |
| pqd_entry = proc_qtu_data_tree_search(&proc_qtu_data_tree, |
| current->tgid); |
| if (pqd_entry) { |
| pr_err("qtaguid: qtudev_open(): %u/%u %u " |
| "%s already opened\n", |
| current->pid, current->tgid, current_fsuid(), |
| QTU_DEV_NAME); |
| res = -EBUSY; |
| goto err_unlock_free_utd; |
| } |
| |
| new_pqd_entry = kzalloc(sizeof(*new_pqd_entry), GFP_ATOMIC); |
| if (!new_pqd_entry) { |
| pr_err("qtaguid: qtudev_open(): %u/%u %u: " |
| "proc data alloc failed\n", |
| current->pid, current->tgid, current_fsuid()); |
| res = -ENOMEM; |
| goto err_unlock_free_utd; |
| } |
| new_pqd_entry->pid = current->tgid; |
| INIT_LIST_HEAD(&new_pqd_entry->sock_tag_list); |
| new_pqd_entry->parent_tag_data = utd_entry; |
| utd_entry->num_pqd++; |
| |
| proc_qtu_data_tree_insert(new_pqd_entry, |
| &proc_qtu_data_tree); |
| |
| spin_unlock_bh(&uid_tag_data_tree_lock); |
| DR_DEBUG("qtaguid: tracking data for uid=%u in pqd=%p\n", |
| current_fsuid(), new_pqd_entry); |
| file->private_data = new_pqd_entry; |
| return 0; |
| |
| err_unlock_free_utd: |
| if (!utd_entry_found) { |
| rb_erase(&utd_entry->node, &uid_tag_data_tree); |
| kfree(utd_entry); |
| } |
| spin_unlock_bh(&uid_tag_data_tree_lock); |
| err: |
| return res; |
| } |
| |
| static int qtudev_release(struct inode *inode, struct file *file) |
| { |
| struct proc_qtu_data *pqd_entry = file->private_data; |
| struct uid_tag_data *utd_entry = pqd_entry->parent_tag_data; |
| struct sock_tag *st_entry; |
| struct rb_root st_to_free_tree = RB_ROOT; |
| struct list_head *entry, *next; |
| struct tag_ref *tr; |
| |
| if (unlikely(qtu_proc_handling_passive)) |
| return 0; |
| |
| /* |
| * Do not trust the current->pid, it might just be a kworker cleaning |
| * up after a dead proc. |
| */ |
| DR_DEBUG("qtaguid: qtudev_release(): " |
| "pid=%u tgid=%u uid=%u " |
| "pqd_entry=%p->pid=%u utd_entry=%p->active_tags=%d\n", |
| current->pid, current->tgid, pqd_entry->parent_tag_data->uid, |
| pqd_entry, pqd_entry->pid, utd_entry, |
| utd_entry->num_active_tags); |
| |
| spin_lock_bh(&sock_tag_list_lock); |
| spin_lock_bh(&uid_tag_data_tree_lock); |
| |
| list_for_each_safe(entry, next, &pqd_entry->sock_tag_list) { |
| st_entry = list_entry(entry, struct sock_tag, list); |
| DR_DEBUG("qtaguid: %s(): " |
| "erase sock_tag=%p->sk=%p pid=%u tgid=%u uid=%u\n", |
| __func__, |
| st_entry, st_entry->sk, |
| current->pid, current->tgid, |
| pqd_entry->parent_tag_data->uid); |
| |
| utd_entry = uid_tag_data_tree_search( |
| &uid_tag_data_tree, |
| get_uid_from_tag(st_entry->tag)); |
| BUG_ON(IS_ERR_OR_NULL(utd_entry)); |
| DR_DEBUG("qtaguid: %s(): " |
| "looking for tag=0x%llx in utd_entry=%p\n", __func__, |
| st_entry->tag, utd_entry); |
| tr = tag_ref_tree_search(&utd_entry->tag_ref_tree, |
| st_entry->tag); |
| BUG_ON(!tr); |
| BUG_ON(tr->num_sock_tags <= 0); |
| tr->num_sock_tags--; |
| free_tag_ref_from_utd_entry(tr, utd_entry); |
| |
| rb_erase(&st_entry->sock_node, &sock_tag_tree); |
| list_del(&st_entry->list); |
| /* Can't sockfd_put() within spinlock, do it later. */ |
| sock_tag_tree_insert(st_entry, &st_to_free_tree); |
| |
| /* |
| * Try to free the utd_entry if no other proc_qtu_data is |
| * using it (num_pqd is 0) and it doesn't have active tags |
| * (num_active_tags is 0). |
| */ |
| put_utd_entry(utd_entry); |
| } |
| |
| rb_erase(&pqd_entry->node, &proc_qtu_data_tree); |
| BUG_ON(pqd_entry->parent_tag_data->num_pqd < 1); |
| pqd_entry->parent_tag_data->num_pqd--; |
| put_utd_entry(pqd_entry->parent_tag_data); |
| kfree(pqd_entry); |
| file->private_data = NULL; |
| |
| spin_unlock_bh(&uid_tag_data_tree_lock); |
| spin_unlock_bh(&sock_tag_list_lock); |
| |
| |
| sock_tag_tree_erase(&st_to_free_tree); |
| |
| prdebug_full_state(0, "%s(): pid=%u tgid=%u", __func__, |
| current->pid, current->tgid); |
| return 0; |
| } |
| |
| /*------------------------------------------*/ |
| static const struct file_operations qtudev_fops = { |
| .owner = THIS_MODULE, |
| .open = qtudev_open, |
| .release = qtudev_release, |
| }; |
| |
| static struct miscdevice qtu_device = { |
| .minor = MISC_DYNAMIC_MINOR, |
| .name = QTU_DEV_NAME, |
| .fops = &qtudev_fops, |
| /* How sad it doesn't allow for defaults: .mode = S_IRUGO | S_IWUSR */ |
| }; |
| |
| /*------------------------------------------*/ |
| static int __init qtaguid_proc_register(struct proc_dir_entry **res_procdir) |
| { |
| int ret; |
| *res_procdir = proc_mkdir(module_procdirname, init_net.proc_net); |
| if (!*res_procdir) { |
| pr_err("qtaguid: failed to create proc/.../xt_qtaguid\n"); |
| ret = -ENOMEM; |
| goto no_dir; |
| } |
| |
| xt_qtaguid_ctrl_file = create_proc_entry("ctrl", proc_ctrl_perms, |
| *res_procdir); |
| if (!xt_qtaguid_ctrl_file) { |
| pr_err("qtaguid: failed to create xt_qtaguid/ctrl " |
| " file\n"); |
| ret = -ENOMEM; |
| goto no_ctrl_entry; |
| } |
| xt_qtaguid_ctrl_file->read_proc = qtaguid_ctrl_proc_read; |
| xt_qtaguid_ctrl_file->write_proc = qtaguid_ctrl_proc_write; |
| |
| xt_qtaguid_stats_file = create_proc_entry("stats", proc_stats_perms, |
| *res_procdir); |
| if (!xt_qtaguid_stats_file) { |
| pr_err("qtaguid: failed to create xt_qtaguid/stats " |
| "file\n"); |
| ret = -ENOMEM; |
| goto no_stats_entry; |
| } |
| xt_qtaguid_stats_file->read_proc = qtaguid_stats_proc_read; |
| /* |
| * TODO: add support counter hacking |
| * xt_qtaguid_stats_file->write_proc = qtaguid_stats_proc_write; |
| */ |
| return 0; |
| |
| no_stats_entry: |
| remove_proc_entry("ctrl", *res_procdir); |
| no_ctrl_entry: |
| remove_proc_entry("xt_qtaguid", NULL); |
| no_dir: |
| return ret; |
| } |
| |
| static struct xt_match qtaguid_mt_reg __read_mostly = { |
| /* |
| * This module masquerades as the "owner" module so that iptables |
| * tools can deal with it. |
| */ |
| .name = "owner", |
| .revision = 1, |
| .family = NFPROTO_UNSPEC, |
| .match = qtaguid_mt, |
| .matchsize = sizeof(struct xt_qtaguid_match_info), |
| .me = THIS_MODULE, |
| }; |
| |
| static int __init qtaguid_mt_init(void) |
| { |
| if (qtaguid_proc_register(&xt_qtaguid_procdir) |
| || iface_stat_init(xt_qtaguid_procdir) |
| || xt_register_match(&qtaguid_mt_reg) |
| || misc_register(&qtu_device)) |
| return -1; |
| return 0; |
| } |
| |
| /* |
| * TODO: allow unloading of the module. |
| * For now stats are permanent. |
| * Kconfig forces'y/n' and never an 'm'. |
| */ |
| |
| module_init(qtaguid_mt_init); |
| MODULE_AUTHOR("jpa <jpa@google.com>"); |
| MODULE_DESCRIPTION("Xtables: socket owner+tag matching and associated stats"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("ipt_owner"); |
| MODULE_ALIAS("ip6t_owner"); |
| MODULE_ALIAS("ipt_qtaguid"); |
| MODULE_ALIAS("ip6t_qtaguid"); |