[232] | 1 | /* |
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| 2 | * ksyslog: In-kernel syslog receiver |
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| 3 | * Copyright(C) 2013 Atzm WATANABE All rights reserved |
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| 4 | * Distributed under the GPL |
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| 5 | */ |
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| 6 | |
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[246] | 7 | #include <linux/version.h> |
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[232] | 8 | #include <linux/module.h> |
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[243] | 9 | #include <linux/inet.h> |
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[232] | 10 | #include <linux/ip.h> |
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| 11 | #include <linux/udp.h> |
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| 12 | #include <linux/namei.h> |
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[263] | 13 | #include <linux/fsnotify.h> |
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[246] | 14 | #include <linux/proc_fs.h> |
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[250] | 15 | #include <linux/u64_stats_sync.h> |
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| 16 | #include <linux/percpu.h> |
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[232] | 17 | #include <net/udp.h> |
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[246] | 18 | #include "compat.h" |
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[232] | 19 | #include "ksyslog.h" |
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| 20 | |
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[242] | 21 | static struct ksyslog_queue ksyslog_queue; |
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[232] | 22 | static struct socket *ksyslog_rcv_sk = NULL; |
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| 23 | |
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| 24 | static struct delayed_work ksyslog_work; |
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| 25 | static struct workqueue_struct *ksyslog_wq = NULL; |
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| 26 | |
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| 27 | #ifdef CONFIG_PROC_FS |
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| 28 | static struct proc_dir_entry *ksyslog_procdir = NULL; |
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| 29 | static struct proc_dir_entry *ksyslog_proc_queue = NULL; |
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[250] | 30 | static struct proc_dir_entry *ksyslog_proc_size = NULL; |
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| 31 | static struct proc_dir_entry *ksyslog_proc_stats = NULL; |
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[232] | 32 | #endif |
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| 33 | |
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| 34 | static char *ksyslog_host = "0.0.0.0"; |
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| 35 | static ushort ksyslog_port = 514; |
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| 36 | static char *ksyslog_path = "/var/log/ksyslog.log"; |
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[250] | 37 | static ulong ksyslog_queue_size_max = 4096; |
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[232] | 38 | static ulong ksyslog_flush_interval = 45; /* milliseconds */ |
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| 39 | |
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[268] | 40 | static DEFINE_SPINLOCK(ksyslog_write_lock); |
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| 41 | |
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[232] | 42 | module_param(ksyslog_host, charp, 0444); |
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| 43 | module_param(ksyslog_port, ushort, 0444); |
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| 44 | module_param(ksyslog_path, charp, 0644); |
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[250] | 45 | module_param(ksyslog_queue_size_max, ulong, 0644); |
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[232] | 46 | module_param(ksyslog_flush_interval, ulong, 0644); |
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| 47 | |
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[250] | 48 | static int |
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[241] | 49 | ksyslog_queue_init(struct ksyslog_queue *queue) |
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| 50 | { |
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| 51 | memset(queue, 0, sizeof(*queue)); |
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| 52 | INIT_LIST_HEAD(&queue->head); |
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[242] | 53 | spin_lock_init(&queue->lock); |
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[250] | 54 | atomic64_set(&queue->size, 0); |
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| 55 | queue->stats = alloc_percpu(struct ksyslog_stats); |
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| 56 | if (unlikely(queue->stats == NULL)) |
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| 57 | return -ENOMEM; |
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| 58 | return 0; |
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[241] | 59 | } |
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| 60 | |
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[250] | 61 | static void |
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| 62 | ksyslog_queue_uninit(struct ksyslog_queue *queue) |
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| 63 | { |
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| 64 | if (likely(queue->stats)) |
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| 65 | free_percpu(queue->stats); |
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| 66 | queue->stats = NULL; |
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| 67 | } |
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| 68 | |
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[232] | 69 | static int |
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| 70 | ksyslog_close(struct file *file) |
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| 71 | { |
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[263] | 72 | int err; |
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| 73 | mm_segment_t oldfs; |
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| 74 | |
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| 75 | oldfs = get_fs(); |
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| 76 | set_fs(get_ds()); |
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| 77 | |
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| 78 | err = filp_close(file, NULL); |
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| 79 | |
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| 80 | set_fs(oldfs); |
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| 81 | return err; |
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[232] | 82 | } |
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| 83 | |
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| 84 | static struct file * |
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| 85 | ksyslog_open(const char *path) |
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| 86 | { |
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| 87 | struct file *file; |
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[243] | 88 | struct path ppath; |
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[232] | 89 | mm_segment_t oldfs; |
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| 90 | |
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| 91 | oldfs = get_fs(); |
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| 92 | set_fs(get_ds()); |
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| 93 | |
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[243] | 94 | if (unlikely(kern_path(path, LOOKUP_OPEN|LOOKUP_FOLLOW, &ppath))) |
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[232] | 95 | file = filp_open(path, O_CREAT|O_WRONLY|O_APPEND|O_LARGEFILE, 0600); |
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| 96 | else |
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| 97 | file = filp_open(path, O_WRONLY|O_APPEND|O_LARGEFILE, 0); |
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| 98 | |
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[234] | 99 | if (unlikely(IS_ERR(file))) |
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[232] | 100 | goto out; |
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| 101 | |
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[264] | 102 | compat_fsnotify_open(file); |
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[263] | 103 | |
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[234] | 104 | if (unlikely(S_ISDIR(file->f_path.dentry->d_inode->i_mode))) { |
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[232] | 105 | ksyslog_close(file); |
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| 106 | file = ERR_PTR(-EISDIR); |
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| 107 | goto out; |
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| 108 | } |
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| 109 | |
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[234] | 110 | if (unlikely(file->f_pos < 0)) { |
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[232] | 111 | ksyslog_close(file); |
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| 112 | file = ERR_PTR(-EIO); |
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| 113 | goto out; |
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| 114 | } |
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| 115 | |
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| 116 | out: |
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| 117 | set_fs(oldfs); |
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| 118 | return file; |
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| 119 | } |
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| 120 | |
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| 121 | static int |
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| 122 | ksyslog_write(struct file *file, const char *buf, const size_t length) |
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| 123 | { |
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| 124 | int err; |
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| 125 | mm_segment_t oldfs; |
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| 126 | |
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| 127 | oldfs = get_fs(); |
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| 128 | set_fs(get_ds()); |
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| 129 | |
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| 130 | err = vfs_write(file, (__force void __user *)buf, length, &file->f_pos); |
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| 131 | |
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| 132 | set_fs(oldfs); |
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| 133 | return err; |
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| 134 | } |
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| 135 | |
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| 136 | static void |
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[234] | 137 | ksyslog_drop_warning(const struct ksyslog_entry *entry) |
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[232] | 138 | { |
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[268] | 139 | net_warn_ratelimited("ksyslog: dropped: %llu %s.%s %u.%u.%u.%u %.*s\n", |
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| 140 | timeval_to_ns(&entry->tv) / 1000 / 1000 / 1000, |
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| 141 | ksyslog_facility_str(entry->facility), |
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| 142 | ksyslog_severity_str(entry->severity), |
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| 143 | entry->saddr.addr8[0], entry->saddr.addr8[1], |
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| 144 | entry->saddr.addr8[2], entry->saddr.addr8[3], |
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| 145 | (int)entry->length, entry->data); |
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[232] | 146 | } |
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| 147 | |
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| 148 | static struct ksyslog_entry * |
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[234] | 149 | ksyslog_entry_create(const struct sk_buff *skb, |
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| 150 | const struct iphdr *iph, const struct udphdr *udph) |
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[232] | 151 | { |
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| 152 | struct ksyslog_entry *entry; |
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[235] | 153 | unsigned int priority, facility, severity, month, day, hour, minute, second; |
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| 154 | unsigned char *start, month_s[4]; |
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| 155 | struct tm tm; |
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[232] | 156 | int length, i; |
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| 157 | |
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[235] | 158 | if (sscanf(skb->data, "<%3u>%3s %2u %2u:%2u:%2u ", |
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| 159 | &priority, month_s, &day, &hour, &minute, &second) != 6) |
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[232] | 160 | return ERR_PTR(-EINVAL); |
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| 161 | |
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| 162 | start = memchr(skb->data, '>', 5); |
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| 163 | if (start == NULL) |
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| 164 | return ERR_PTR(-EINVAL); |
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| 165 | start++; |
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| 166 | |
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| 167 | facility = priority >> 3; |
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| 168 | severity = priority & 7; |
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| 169 | |
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| 170 | if (facility >= __KSYSLOG_F_MAX) |
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| 171 | return ERR_PTR(-EINVAL); |
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| 172 | if (severity >= __KSYSLOG_S_MAX) |
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| 173 | return ERR_PTR(-EINVAL); |
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| 174 | |
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[235] | 175 | month = ksyslog_month_num(month_s); |
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| 176 | if (!month) |
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| 177 | return ERR_PTR(-EINVAL); |
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| 178 | if (day > 31) |
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| 179 | return ERR_PTR(-EINVAL); |
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| 180 | if (hour > 23) |
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| 181 | return ERR_PTR(-EINVAL); |
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| 182 | if (minute > 59) |
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| 183 | return ERR_PTR(-EINVAL); |
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| 184 | if (second > 59) |
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| 185 | return ERR_PTR(-EINVAL); |
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| 186 | |
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[232] | 187 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
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[234] | 188 | if (unlikely(entry == NULL)) |
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[232] | 189 | return ERR_PTR(-ENOMEM); |
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| 190 | |
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| 191 | length = skb->len - (start - skb->data); |
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| 192 | entry->data = kzalloc(length, GFP_ATOMIC); |
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[234] | 193 | if (unlikely(entry->data == NULL)) { |
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[232] | 194 | kfree(entry); |
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| 195 | return ERR_PTR(-ENOMEM); |
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| 196 | } |
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| 197 | |
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| 198 | if (skb->tstamp.tv64) |
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| 199 | entry->tv = ktime_to_timeval(skb->tstamp); |
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| 200 | else |
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| 201 | do_gettimeofday(&entry->tv); |
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| 202 | |
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[235] | 203 | time_to_tm(entry->tv.tv_sec, 0, &tm); |
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| 204 | entry->time = mktime(tm.tm_year + 1900, month, day, hour, minute, second); |
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| 205 | |
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| 206 | entry->priority = priority; |
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[234] | 207 | entry->facility = facility; |
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| 208 | entry->severity = severity; |
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| 209 | |
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[232] | 210 | entry->daddr.addr32 = iph->daddr; |
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| 211 | entry->saddr.addr32 = iph->saddr; |
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| 212 | |
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| 213 | entry->dport = udph->dest; |
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| 214 | entry->sport = udph->source; |
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| 215 | |
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| 216 | entry->length = length; |
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| 217 | memcpy(entry->data, start, length); |
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| 218 | |
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| 219 | for (i = 0; i < length; i++) |
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[234] | 220 | if (unlikely(entry->data[i] == '\n')) |
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[232] | 221 | entry->data[i] = ' '; |
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| 222 | |
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| 223 | return entry; |
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| 224 | } |
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| 225 | |
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| 226 | static void |
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| 227 | ksyslog_entry_free(struct rcu_head *head) |
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| 228 | { |
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| 229 | struct ksyslog_entry *entry = container_of(head, struct ksyslog_entry, rcu); |
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| 230 | kfree(entry->data); |
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| 231 | kfree(entry); |
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| 232 | } |
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| 233 | |
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| 234 | static int |
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| 235 | ksyslog_entry_add(struct ksyslog_queue *queue, struct ksyslog_entry *entry) |
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| 236 | { |
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[250] | 237 | if (unlikely(atomic64_read(&queue->size) >= ksyslog_queue_size_max)) |
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[232] | 238 | return -ENOBUFS; |
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| 239 | list_add_tail_rcu(&entry->list, &queue->head); |
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[250] | 240 | WARN_ON(atomic64_inc_return(&queue->size) > ksyslog_queue_size_max); |
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[232] | 241 | return 0; |
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| 242 | } |
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| 243 | |
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| 244 | static void |
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| 245 | ksyslog_entry_del(struct ksyslog_queue *queue, struct ksyslog_entry *entry, bool free) |
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| 246 | { |
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[250] | 247 | WARN_ON(atomic64_dec_return(&queue->size) < 0); |
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[232] | 248 | list_del_rcu(&entry->list); |
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| 249 | if (free) |
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| 250 | call_rcu(&entry->rcu, ksyslog_entry_free); |
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| 251 | } |
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| 252 | |
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| 253 | static void |
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| 254 | ksyslog_entry_destroy(struct ksyslog_queue *queue) |
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| 255 | { |
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| 256 | struct ksyslog_entry *entry, *next; |
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| 257 | |
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| 258 | list_for_each_entry_safe(entry, next, &queue->head, list) |
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| 259 | ksyslog_entry_del(queue, entry, true); |
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| 260 | } |
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| 261 | |
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[268] | 262 | static int |
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| 263 | ksyslog_entry_format(char **buf, const struct ksyslog_entry *entry) |
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[232] | 264 | { |
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[268] | 265 | *buf = kzalloc(54 + entry->length + 2, GFP_ATOMIC); |
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| 266 | if (unlikely(*buf == NULL)) |
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| 267 | return -ENOMEM; |
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[232] | 268 | |
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[268] | 269 | return sprintf(*buf, "%llu %s.%s %u.%u.%u.%u %.*s\n", |
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| 270 | timeval_to_ns(&entry->tv) / 1000 / 1000 / 1000, |
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| 271 | ksyslog_facility_str(entry->facility), |
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| 272 | ksyslog_severity_str(entry->severity), |
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| 273 | entry->saddr.addr8[0], entry->saddr.addr8[1], |
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| 274 | entry->saddr.addr8[2], entry->saddr.addr8[3], |
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| 275 | (int)entry->length, entry->data); |
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| 276 | } |
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| 277 | |
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| 278 | static bool |
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| 279 | ksyslog_entry_write(struct file *file, struct ksyslog_entry *entry) |
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| 280 | { |
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| 281 | int length; |
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| 282 | char *buf; |
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| 283 | |
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| 284 | length = ksyslog_entry_format(&buf, entry); |
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| 285 | |
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| 286 | if (unlikely(length < 0)) |
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| 287 | return false; |
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| 288 | |
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| 289 | if (unlikely(ksyslog_write(file, buf, length) != length)) { |
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| 290 | kfree(buf); |
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| 291 | return false; |
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[232] | 292 | } |
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[268] | 293 | |
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| 294 | kfree(buf); |
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| 295 | return true; |
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[232] | 296 | } |
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| 297 | |
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| 298 | static void |
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| 299 | ksyslog_work_register(unsigned long timer) |
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| 300 | { |
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| 301 | queue_delayed_work(ksyslog_wq, &ksyslog_work, timer * HZ / 1000); |
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| 302 | } |
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| 303 | |
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| 304 | static void |
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| 305 | ksyslog_work_unregister(void) |
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| 306 | { |
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| 307 | cancel_delayed_work_sync(&ksyslog_work); |
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| 308 | } |
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| 309 | |
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| 310 | static void |
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| 311 | ksyslog_work_handler(struct work_struct *work) |
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| 312 | { |
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| 313 | struct file *file = NULL; |
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[268] | 314 | struct ksyslog_entry *entry; |
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[232] | 315 | |
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[268] | 316 | file = ksyslog_open(ksyslog_path); |
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| 317 | if (unlikely(IS_ERR(file))) |
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[250] | 318 | goto out; |
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[232] | 319 | |
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[268] | 320 | while (true) { |
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| 321 | bool write_ok; |
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[232] | 322 | |
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[242] | 323 | spin_lock_bh(&ksyslog_queue.lock); |
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[268] | 324 | entry = list_first_or_null_rcu(&ksyslog_queue.head, |
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| 325 | struct ksyslog_entry, list); |
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| 326 | if (!entry) { |
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| 327 | spin_unlock_bh(&ksyslog_queue.lock); |
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| 328 | break; |
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| 329 | } |
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| 330 | ksyslog_entry_del(&ksyslog_queue, entry, false); |
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[242] | 331 | spin_unlock_bh(&ksyslog_queue.lock); |
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[232] | 332 | |
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[268] | 333 | spin_lock(&ksyslog_write_lock); |
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| 334 | write_ok = ksyslog_entry_write(file, entry); |
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| 335 | spin_unlock(&ksyslog_write_lock); |
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[232] | 336 | |
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[268] | 337 | if (likely(write_ok)) { |
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| 338 | ksyslog_stats_add_write(&ksyslog_queue, entry->length); |
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| 339 | } else { |
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[250] | 340 | ksyslog_stats_add_drop(&ksyslog_queue, entry->length); |
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[232] | 341 | ksyslog_drop_warning(entry); |
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| 342 | } |
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[268] | 343 | |
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| 344 | call_rcu(&entry->rcu, ksyslog_entry_free); |
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[232] | 345 | } |
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[234] | 346 | |
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[232] | 347 | ksyslog_close(file); |
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| 348 | |
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| 349 | out: |
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| 350 | ksyslog_work_register(ksyslog_flush_interval); |
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| 351 | } |
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| 352 | |
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| 353 | static int |
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| 354 | ksyslog_rcv(struct sock *sk, struct sk_buff *skb) |
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| 355 | { |
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| 356 | int err; |
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| 357 | struct iphdr *iph; |
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| 358 | struct udphdr *udph; |
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| 359 | struct ksyslog_entry *entry; |
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| 360 | |
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[250] | 361 | if (unlikely(skb_linearize(skb))) { |
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| 362 | ksyslog_stats_add_drop(&ksyslog_queue, skb->len); |
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| 363 | goto out; |
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| 364 | } |
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[232] | 365 | |
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| 366 | iph = ip_hdr(skb); |
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| 367 | udph = udp_hdr(skb); |
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| 368 | |
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[250] | 369 | if (unlikely(!skb_pull(skb, sizeof(*udph)))) { |
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| 370 | ksyslog_stats_add_drop(&ksyslog_queue, skb->len); |
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| 371 | goto out; |
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| 372 | } |
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[232] | 373 | |
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| 374 | entry = ksyslog_entry_create(skb, iph, udph); |
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[250] | 375 | if (unlikely(IS_ERR(entry))) { |
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| 376 | if (PTR_ERR(entry) == -EINVAL) { |
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| 377 | ksyslog_stats_add_discard(&ksyslog_queue, skb->len); |
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| 378 | goto out; |
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| 379 | } |
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[232] | 380 | |
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[250] | 381 | ksyslog_stats_add_drop(&ksyslog_queue, skb->len); |
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| 382 | goto out; |
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| 383 | } |
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| 384 | |
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[242] | 385 | spin_lock_bh(&ksyslog_queue.lock); |
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[232] | 386 | err = ksyslog_entry_add(&ksyslog_queue, entry); |
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[242] | 387 | spin_unlock_bh(&ksyslog_queue.lock); |
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[232] | 388 | |
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[241] | 389 | if (unlikely(err)) { |
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[250] | 390 | ksyslog_stats_add_drop(&ksyslog_queue, entry->length); |
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[241] | 391 | ksyslog_drop_warning(entry); |
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[232] | 392 | ksyslog_entry_free(&entry->rcu); |
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[250] | 393 | goto out; |
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[241] | 394 | } |
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[232] | 395 | |
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| 396 | out: |
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| 397 | consume_skb(skb); |
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| 398 | return 0; |
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| 399 | } |
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| 400 | |
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| 401 | #ifdef CONFIG_PROC_FS |
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| 402 | static void * |
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[240] | 403 | ksyslog_rculist_seq_start(struct seq_file *seq, loff_t *pos) |
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[232] | 404 | { |
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| 405 | struct list_head *lh, *head = seq->private; |
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| 406 | loff_t ppos = *pos; |
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| 407 | |
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| 408 | rcu_read_lock(); |
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| 409 | |
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| 410 | __list_for_each_rcu(lh, head) |
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| 411 | if (ppos-- == 0) |
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| 412 | return lh; |
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| 413 | |
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| 414 | return NULL; |
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| 415 | } |
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| 416 | |
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| 417 | static void * |
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[240] | 418 | ksyslog_rculist_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
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[232] | 419 | { |
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| 420 | struct list_head *lh = rcu_dereference(((struct list_head *)v)->next); |
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| 421 | ++(*pos); |
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| 422 | return lh == seq->private ? NULL : lh; |
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| 423 | } |
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| 424 | |
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| 425 | static void |
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[240] | 426 | ksyslog_rculist_seq_stop(struct seq_file *seq, void *v) |
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[232] | 427 | { |
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| 428 | rcu_read_unlock(); |
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| 429 | } |
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| 430 | |
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| 431 | static int |
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| 432 | ksyslog_queue_seq_show(struct seq_file *seq, void *v) |
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| 433 | { |
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| 434 | const struct ksyslog_entry *entry = list_entry_rcu(v, struct ksyslog_entry, list); |
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| 435 | |
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[233] | 436 | seq_printf(seq, "%llu %s.%s %u.%u.%u.%u %.*s\n", |
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[232] | 437 | timeval_to_ns(&entry->tv) / 1000 / 1000 / 1000, |
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[233] | 438 | ksyslog_facility_str(entry->facility), |
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| 439 | ksyslog_severity_str(entry->severity), |
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[232] | 440 | entry->saddr.addr8[0], entry->saddr.addr8[1], |
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| 441 | entry->saddr.addr8[2], entry->saddr.addr8[3], |
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| 442 | (int)entry->length, entry->data); |
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| 443 | |
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| 444 | return 0; |
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| 445 | } |
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| 446 | |
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| 447 | static struct seq_operations ksyslog_queue_seq_ops = { |
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[240] | 448 | .start = ksyslog_rculist_seq_start, |
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| 449 | .next = ksyslog_rculist_seq_next, |
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| 450 | .stop = ksyslog_rculist_seq_stop, |
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[232] | 451 | .show = ksyslog_queue_seq_show, |
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| 452 | }; |
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| 453 | |
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| 454 | static int |
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| 455 | ksyslog_queue_seq_open(struct inode *inode, struct file *file) |
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| 456 | { |
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| 457 | int err = seq_open(file, &ksyslog_queue_seq_ops); |
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| 458 | |
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| 459 | if (!err) |
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[246] | 460 | ((struct seq_file *)file->private_data)->private = PDE_DATA(inode); |
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[232] | 461 | |
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| 462 | return err; |
---|
| 463 | } |
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| 464 | |
---|
| 465 | static struct file_operations ksyslog_queue_fops = { |
---|
| 466 | .owner = THIS_MODULE, |
---|
| 467 | .open = ksyslog_queue_seq_open, |
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| 468 | .read = seq_read, |
---|
| 469 | .llseek = seq_lseek, |
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| 470 | .release = seq_release, |
---|
| 471 | }; |
---|
| 472 | |
---|
| 473 | static int |
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[250] | 474 | ksyslog_size_seq_show(struct seq_file *seq, void *v) |
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[240] | 475 | { |
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[250] | 476 | seq_printf(seq, "%lu\n", atomic64_read(&ksyslog_queue.size)); |
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[240] | 477 | return 0; |
---|
| 478 | } |
---|
| 479 | |
---|
| 480 | static int |
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[250] | 481 | ksyslog_size_seq_open(struct inode *inode, struct file *file) |
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[240] | 482 | { |
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[250] | 483 | return single_open(file, ksyslog_size_seq_show, PDE_DATA(inode)); |
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[240] | 484 | } |
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| 485 | |
---|
[241] | 486 | static int |
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[250] | 487 | ksyslog_stats_seq_show(struct seq_file *seq, void *v) |
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[241] | 488 | { |
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[250] | 489 | int i; |
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| 490 | struct ksyslog_stats stats; |
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[241] | 491 | |
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[250] | 492 | memset(&stats, 0, sizeof(stats)); |
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[241] | 493 | |
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[250] | 494 | for_each_possible_cpu(i) { |
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| 495 | const struct ksyslog_stats *percpu_stats; |
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| 496 | struct ksyslog_stats local_stats; |
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| 497 | unsigned int start; |
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| 498 | |
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| 499 | percpu_stats = per_cpu_ptr(ksyslog_queue.stats, i); |
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| 500 | |
---|
| 501 | do { |
---|
| 502 | start = u64_stats_fetch_begin_bh(&percpu_stats->sync); |
---|
| 503 | local_stats = *percpu_stats; |
---|
| 504 | } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start)); |
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| 505 | |
---|
| 506 | stats.write_bytes += local_stats.write_bytes; |
---|
| 507 | stats.write_packets += local_stats.write_packets; |
---|
| 508 | stats.drop_bytes += local_stats.drop_bytes; |
---|
| 509 | stats.drop_packets += local_stats.drop_packets; |
---|
| 510 | stats.discard_bytes += local_stats.discard_bytes; |
---|
| 511 | stats.discard_packets += local_stats.discard_packets; |
---|
| 512 | } |
---|
| 513 | |
---|
| 514 | seq_puts(seq, "{\n"); |
---|
| 515 | seq_puts(seq, " \"write\": {\n"); |
---|
| 516 | seq_printf(seq, " \"bytes\": \"%llu\",\n", stats.write_bytes); |
---|
| 517 | seq_printf(seq, " \"packets\": \"%llu\"\n", stats.write_packets); |
---|
| 518 | seq_puts(seq, " },\n"); |
---|
| 519 | seq_puts(seq, " \"drop\": {\n"); |
---|
| 520 | seq_printf(seq, " \"bytes\": \"%llu\",\n", stats.drop_bytes); |
---|
| 521 | seq_printf(seq, " \"packets\": \"%llu\"\n", stats.drop_packets); |
---|
| 522 | seq_puts(seq, " },\n"); |
---|
| 523 | seq_puts(seq, " \"discard\": {\n"); |
---|
| 524 | seq_printf(seq, " \"bytes\": \"%llu\",\n", stats.discard_bytes); |
---|
| 525 | seq_printf(seq, " \"packets\": \"%llu\"\n", stats.discard_packets); |
---|
| 526 | seq_puts(seq, " }\n"); |
---|
| 527 | seq_puts(seq, "}\n"); |
---|
| 528 | |
---|
[241] | 529 | return 0; |
---|
| 530 | } |
---|
| 531 | |
---|
| 532 | static int |
---|
[250] | 533 | ksyslog_stats_seq_open(struct inode *inode, struct file *file) |
---|
[241] | 534 | { |
---|
[250] | 535 | return single_open(file, ksyslog_stats_seq_show, PDE_DATA(inode)); |
---|
[241] | 536 | } |
---|
| 537 | |
---|
[250] | 538 | static struct file_operations ksyslog_size_fops = { |
---|
[240] | 539 | .owner = THIS_MODULE, |
---|
[250] | 540 | .open = ksyslog_size_seq_open, |
---|
[240] | 541 | .read = seq_read, |
---|
| 542 | .llseek = seq_lseek, |
---|
| 543 | .release = single_release, |
---|
| 544 | }; |
---|
| 545 | |
---|
[250] | 546 | static struct file_operations ksyslog_stats_fops = { |
---|
[241] | 547 | .owner = THIS_MODULE, |
---|
[250] | 548 | .open = ksyslog_stats_seq_open, |
---|
[241] | 549 | .read = seq_read, |
---|
| 550 | .llseek = seq_lseek, |
---|
| 551 | .release = single_release, |
---|
| 552 | }; |
---|
| 553 | |
---|
| 554 | static void |
---|
| 555 | ksyslog_proc_destroy(void) |
---|
| 556 | { |
---|
| 557 | if (ksyslog_proc_queue) |
---|
[246] | 558 | remove_proc_entry("queue", ksyslog_procdir); |
---|
[241] | 559 | ksyslog_proc_queue = NULL; |
---|
| 560 | |
---|
[250] | 561 | if (ksyslog_proc_size) |
---|
| 562 | remove_proc_entry("size", ksyslog_procdir); |
---|
| 563 | ksyslog_proc_size = NULL; |
---|
[241] | 564 | |
---|
[250] | 565 | if (ksyslog_proc_stats) |
---|
| 566 | remove_proc_entry("stats", ksyslog_procdir); |
---|
| 567 | ksyslog_proc_stats = NULL; |
---|
[241] | 568 | |
---|
| 569 | if (ksyslog_procdir) |
---|
[246] | 570 | remove_proc_entry("ksyslog", NULL); |
---|
[241] | 571 | ksyslog_procdir = NULL; |
---|
| 572 | } |
---|
| 573 | |
---|
[240] | 574 | static int |
---|
[232] | 575 | ksyslog_proc_init(void) |
---|
| 576 | { |
---|
| 577 | ksyslog_procdir = proc_mkdir("ksyslog", NULL); |
---|
| 578 | if (ksyslog_procdir == NULL) { |
---|
[250] | 579 | pr_err("ksyslog: proc_mkdir failed\n"); |
---|
[241] | 580 | goto err; |
---|
[232] | 581 | } |
---|
| 582 | |
---|
[239] | 583 | ksyslog_proc_queue = proc_create_data("queue", S_IRUGO, ksyslog_procdir, |
---|
| 584 | &ksyslog_queue_fops, &ksyslog_queue.head); |
---|
[232] | 585 | if (ksyslog_proc_queue == NULL) { |
---|
[250] | 586 | pr_err("ksyslog: proc_create(queue) failed\n"); |
---|
[241] | 587 | goto err; |
---|
[232] | 588 | } |
---|
| 589 | |
---|
[250] | 590 | ksyslog_proc_size = proc_create("size", S_IRUGO, ksyslog_procdir, |
---|
| 591 | &ksyslog_size_fops); |
---|
| 592 | if (ksyslog_proc_size == NULL) { |
---|
| 593 | pr_err("ksyslog: proc_create(size) failed\n"); |
---|
[241] | 594 | goto err; |
---|
[240] | 595 | } |
---|
| 596 | |
---|
[250] | 597 | ksyslog_proc_stats = proc_create("stats", S_IRUGO, ksyslog_procdir, |
---|
| 598 | &ksyslog_stats_fops); |
---|
| 599 | if (ksyslog_proc_stats == NULL) { |
---|
| 600 | pr_err("ksyslog: proc_create(stats) failed\n"); |
---|
[241] | 601 | goto err; |
---|
| 602 | } |
---|
[232] | 603 | |
---|
[241] | 604 | return 0; |
---|
[232] | 605 | |
---|
[241] | 606 | err: |
---|
| 607 | ksyslog_proc_destroy(); |
---|
| 608 | return -ENOMEM; |
---|
[232] | 609 | } |
---|
| 610 | #endif |
---|
| 611 | |
---|
| 612 | static void |
---|
| 613 | ksyslog_finish(void) |
---|
| 614 | { |
---|
| 615 | if (ksyslog_rcv_sk) |
---|
| 616 | sock_release(ksyslog_rcv_sk); |
---|
| 617 | ksyslog_rcv_sk = NULL; |
---|
| 618 | |
---|
| 619 | if (ksyslog_wq) { |
---|
| 620 | ksyslog_work_unregister(); |
---|
| 621 | destroy_workqueue(ksyslog_wq); |
---|
| 622 | } |
---|
| 623 | ksyslog_wq = NULL; |
---|
| 624 | |
---|
| 625 | #ifdef CONFIG_PROC_FS |
---|
| 626 | ksyslog_proc_destroy(); |
---|
| 627 | #endif |
---|
| 628 | |
---|
| 629 | ksyslog_entry_destroy(&ksyslog_queue); |
---|
[237] | 630 | rcu_barrier(); |
---|
[250] | 631 | |
---|
| 632 | ksyslog_queue_uninit(&ksyslog_queue); |
---|
[232] | 633 | } |
---|
| 634 | |
---|
| 635 | static int __init |
---|
| 636 | ksyslog_init(void) |
---|
| 637 | { |
---|
| 638 | int err; |
---|
| 639 | struct sockaddr_in sin; |
---|
| 640 | |
---|
[250] | 641 | err = ksyslog_queue_init(&ksyslog_queue); |
---|
| 642 | if (err) |
---|
| 643 | goto err; |
---|
[232] | 644 | |
---|
| 645 | #ifdef CONFIG_PROC_FS |
---|
| 646 | err = ksyslog_proc_init(); |
---|
| 647 | if (err) |
---|
| 648 | goto err; |
---|
| 649 | #endif |
---|
| 650 | |
---|
[268] | 651 | ksyslog_wq = create_workqueue("ksyslog"); |
---|
[232] | 652 | if (ksyslog_wq == NULL) { |
---|
[250] | 653 | pr_err("ksyslog: create_workqueue failed\n"); |
---|
[232] | 654 | err = -ENOMEM; |
---|
| 655 | goto err; |
---|
| 656 | } |
---|
| 657 | |
---|
| 658 | INIT_DELAYED_WORK(&ksyslog_work, ksyslog_work_handler); |
---|
| 659 | |
---|
| 660 | err = sock_create(AF_INET, SOCK_DGRAM, 0, &ksyslog_rcv_sk); |
---|
| 661 | if (err) { |
---|
[250] | 662 | pr_err("ksyslog: sock_create failed\n"); |
---|
[232] | 663 | goto err; |
---|
| 664 | } |
---|
| 665 | |
---|
| 666 | sin.sin_family = AF_INET; |
---|
| 667 | sin.sin_addr.s_addr = in_aton(ksyslog_host); |
---|
| 668 | sin.sin_port = htons(ksyslog_port); |
---|
| 669 | |
---|
| 670 | err = kernel_bind(ksyslog_rcv_sk, (struct sockaddr *)&sin, |
---|
| 671 | sizeof(struct sockaddr_in)); |
---|
| 672 | if (err) { |
---|
[250] | 673 | pr_err("ksyslog: kernel_bind failed\n"); |
---|
[232] | 674 | goto err; |
---|
| 675 | } |
---|
| 676 | |
---|
[247] | 677 | ksyslog_work_register(ksyslog_flush_interval); |
---|
| 678 | |
---|
[232] | 679 | udp_sk(ksyslog_rcv_sk->sk)->encap_type = UDP_ENCAP_KSYSLOG; |
---|
| 680 | udp_sk(ksyslog_rcv_sk->sk)->encap_rcv = ksyslog_rcv; |
---|
[247] | 681 | udp_encap_enable(); |
---|
[232] | 682 | |
---|
| 683 | return 0; |
---|
| 684 | |
---|
| 685 | err: |
---|
| 686 | ksyslog_finish(); |
---|
| 687 | return err; |
---|
| 688 | } |
---|
| 689 | |
---|
| 690 | static void __exit |
---|
| 691 | ksyslog_exit(void) |
---|
| 692 | { |
---|
| 693 | ksyslog_finish(); |
---|
| 694 | } |
---|
| 695 | |
---|
| 696 | module_init(ksyslog_init); |
---|
| 697 | module_exit(ksyslog_exit); |
---|
| 698 | |
---|
| 699 | MODULE_AUTHOR("Atzm WATANABE"); |
---|
| 700 | MODULE_DESCRIPTION("In-kernel syslog receiver"); |
---|
| 701 | MODULE_LICENSE("GPL"); |
---|