Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This is a module which is used for queueing IPv4 packets and |
| 3 | * communicating with userspace via netlink. |
| 4 | * |
| 5 | * (C) 2000-2002 James Morris <jmorris@intercode.com.au> |
Harald Welte | 9bb7bc9 | 2005-05-30 15:35:26 -0700 | [diff] [blame] | 6 | * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | */ |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/skbuff.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/ip.h> |
| 16 | #include <linux/notifier.h> |
| 17 | #include <linux/netdevice.h> |
| 18 | #include <linux/netfilter.h> |
| 19 | #include <linux/netfilter_ipv4/ip_queue.h> |
| 20 | #include <linux/netfilter_ipv4/ip_tables.h> |
| 21 | #include <linux/netlink.h> |
| 22 | #include <linux/spinlock.h> |
| 23 | #include <linux/sysctl.h> |
| 24 | #include <linux/proc_fs.h> |
Alexey Dobriyan | 7351a22 | 2007-11-05 20:33:46 -0800 | [diff] [blame] | 25 | #include <linux/seq_file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/security.h> |
Scott James Remnant | 95ba434 | 2009-03-16 15:31:10 +0100 | [diff] [blame] | 27 | #include <linux/net.h> |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 28 | #include <linux/mutex.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame^] | 29 | #include <linux/slab.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 30 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <net/sock.h> |
| 32 | #include <net/route.h> |
Patrick McHardy | c01cd42 | 2007-12-05 01:24:48 -0800 | [diff] [blame] | 33 | #include <net/netfilter/nf_queue.h> |
Pavel Emelyanov | 3d7cc2b | 2008-01-09 00:33:11 -0800 | [diff] [blame] | 34 | #include <net/ip.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
| 36 | #define IPQ_QMAX_DEFAULT 1024 |
| 37 | #define IPQ_PROC_FS_NAME "ip_queue" |
| 38 | #define NET_IPQ_QMAX 2088 |
| 39 | #define NET_IPQ_QMAX_NAME "ip_queue_maxlen" |
| 40 | |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 41 | typedef int (*ipq_cmpfn)(struct nf_queue_entry *, unsigned long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
Brian Haley | 1192e40 | 2006-09-20 12:03:46 -0700 | [diff] [blame] | 43 | static unsigned char copy_mode __read_mostly = IPQ_COPY_NONE; |
Brian Haley | 94aec08 | 2006-09-18 00:05:22 -0700 | [diff] [blame] | 44 | static unsigned int queue_maxlen __read_mostly = IPQ_QMAX_DEFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | static DEFINE_RWLOCK(queue_lock); |
Brian Haley | 1192e40 | 2006-09-20 12:03:46 -0700 | [diff] [blame] | 46 | static int peer_pid __read_mostly; |
| 47 | static unsigned int copy_range __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | static unsigned int queue_total; |
| 49 | static unsigned int queue_dropped = 0; |
| 50 | static unsigned int queue_user_dropped = 0; |
Brian Haley | 1192e40 | 2006-09-20 12:03:46 -0700 | [diff] [blame] | 51 | static struct sock *ipqnl __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | static LIST_HEAD(queue_list); |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 53 | static DEFINE_MUTEX(ipqnl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | static inline void |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 56 | __ipq_enqueue_entry(struct nf_queue_entry *entry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | { |
Patrick McHardy | 0ac41e8 | 2007-12-05 01:25:03 -0800 | [diff] [blame] | 58 | list_add_tail(&entry->list, &queue_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | queue_total++; |
| 60 | } |
| 61 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | static inline int |
| 63 | __ipq_set_mode(unsigned char mode, unsigned int range) |
| 64 | { |
| 65 | int status = 0; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 66 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | switch(mode) { |
| 68 | case IPQ_COPY_NONE: |
| 69 | case IPQ_COPY_META: |
| 70 | copy_mode = mode; |
| 71 | copy_range = 0; |
| 72 | break; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 73 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | case IPQ_COPY_PACKET: |
| 75 | copy_mode = mode; |
| 76 | copy_range = range; |
| 77 | if (copy_range > 0xFFFF) |
| 78 | copy_range = 0xFFFF; |
| 79 | break; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 80 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | default: |
| 82 | status = -EINVAL; |
| 83 | |
| 84 | } |
| 85 | return status; |
| 86 | } |
| 87 | |
Patrick McHardy | 9521409 | 2007-12-05 01:25:46 -0800 | [diff] [blame] | 88 | static void __ipq_flush(ipq_cmpfn cmpfn, unsigned long data); |
| 89 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | static inline void |
| 91 | __ipq_reset(void) |
| 92 | { |
| 93 | peer_pid = 0; |
| 94 | net_disable_timestamp(); |
| 95 | __ipq_set_mode(IPQ_COPY_NONE, 0); |
Patrick McHardy | 9521409 | 2007-12-05 01:25:46 -0800 | [diff] [blame] | 96 | __ipq_flush(NULL, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | } |
| 98 | |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 99 | static struct nf_queue_entry * |
Patrick McHardy | 9521409 | 2007-12-05 01:25:46 -0800 | [diff] [blame] | 100 | ipq_find_dequeue_entry(unsigned long id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | { |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 102 | struct nf_queue_entry *entry = NULL, *i; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 103 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | write_lock_bh(&queue_lock); |
Patrick McHardy | 9521409 | 2007-12-05 01:25:46 -0800 | [diff] [blame] | 105 | |
| 106 | list_for_each_entry(i, &queue_list, list) { |
| 107 | if ((unsigned long)i == id) { |
| 108 | entry = i; |
| 109 | break; |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | if (entry) { |
| 114 | list_del(&entry->list); |
| 115 | queue_total--; |
| 116 | } |
| 117 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | write_unlock_bh(&queue_lock); |
| 119 | return entry; |
| 120 | } |
| 121 | |
| 122 | static void |
Patrick McHardy | 9521409 | 2007-12-05 01:25:46 -0800 | [diff] [blame] | 123 | __ipq_flush(ipq_cmpfn cmpfn, unsigned long data) |
| 124 | { |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 125 | struct nf_queue_entry *entry, *next; |
Patrick McHardy | 9521409 | 2007-12-05 01:25:46 -0800 | [diff] [blame] | 126 | |
| 127 | list_for_each_entry_safe(entry, next, &queue_list, list) { |
| 128 | if (!cmpfn || cmpfn(entry, data)) { |
| 129 | list_del(&entry->list); |
| 130 | queue_total--; |
Patrick McHardy | 4b3d15e | 2007-12-05 01:27:02 -0800 | [diff] [blame] | 131 | nf_reinject(entry, NF_DROP); |
Patrick McHardy | 9521409 | 2007-12-05 01:25:46 -0800 | [diff] [blame] | 132 | } |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | static void |
| 137 | ipq_flush(ipq_cmpfn cmpfn, unsigned long data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | { |
| 139 | write_lock_bh(&queue_lock); |
Patrick McHardy | 9521409 | 2007-12-05 01:25:46 -0800 | [diff] [blame] | 140 | __ipq_flush(cmpfn, data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | write_unlock_bh(&queue_lock); |
| 142 | } |
| 143 | |
| 144 | static struct sk_buff * |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 145 | ipq_build_packet_message(struct nf_queue_entry *entry, int *errp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | { |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 147 | sk_buff_data_t old_tail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | size_t size = 0; |
| 149 | size_t data_len = 0; |
| 150 | struct sk_buff *skb; |
| 151 | struct ipq_packet_msg *pmsg; |
| 152 | struct nlmsghdr *nlh; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 153 | struct timeval tv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
| 155 | read_lock_bh(&queue_lock); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 156 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | switch (copy_mode) { |
| 158 | case IPQ_COPY_META: |
| 159 | case IPQ_COPY_NONE: |
| 160 | size = NLMSG_SPACE(sizeof(*pmsg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | break; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 162 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | case IPQ_COPY_PACKET: |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 164 | if ((entry->skb->ip_summed == CHECKSUM_PARTIAL || |
| 165 | entry->skb->ip_summed == CHECKSUM_COMPLETE) && |
| 166 | (*errp = skb_checksum_help(entry->skb))) { |
Patrick McHardy | 66a79a1 | 2005-08-23 10:10:35 -0700 | [diff] [blame] | 167 | read_unlock_bh(&queue_lock); |
| 168 | return NULL; |
| 169 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | if (copy_range == 0 || copy_range > entry->skb->len) |
| 171 | data_len = entry->skb->len; |
| 172 | else |
| 173 | data_len = copy_range; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 174 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | size = NLMSG_SPACE(sizeof(*pmsg) + data_len); |
| 176 | break; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 177 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | default: |
| 179 | *errp = -EINVAL; |
| 180 | read_unlock_bh(&queue_lock); |
| 181 | return NULL; |
| 182 | } |
| 183 | |
| 184 | read_unlock_bh(&queue_lock); |
| 185 | |
| 186 | skb = alloc_skb(size, GFP_ATOMIC); |
| 187 | if (!skb) |
| 188 | goto nlmsg_failure; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 189 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 190 | old_tail = skb->tail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh)); |
| 192 | pmsg = NLMSG_DATA(nlh); |
| 193 | memset(pmsg, 0, sizeof(*pmsg)); |
| 194 | |
| 195 | pmsg->packet_id = (unsigned long )entry; |
| 196 | pmsg->data_len = data_len; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 197 | tv = ktime_to_timeval(entry->skb->tstamp); |
| 198 | pmsg->timestamp_sec = tv.tv_sec; |
| 199 | pmsg->timestamp_usec = tv.tv_usec; |
Thomas Graf | 82e91ff | 2006-11-09 15:19:14 -0800 | [diff] [blame] | 200 | pmsg->mark = entry->skb->mark; |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 201 | pmsg->hook = entry->hook; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | pmsg->hw_protocol = entry->skb->protocol; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 203 | |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 204 | if (entry->indev) |
| 205 | strcpy(pmsg->indev_name, entry->indev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | else |
| 207 | pmsg->indev_name[0] = '\0'; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 208 | |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 209 | if (entry->outdev) |
| 210 | strcpy(pmsg->outdev_name, entry->outdev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | else |
| 212 | pmsg->outdev_name[0] = '\0'; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 213 | |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 214 | if (entry->indev && entry->skb->dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | pmsg->hw_type = entry->skb->dev->type; |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 216 | pmsg->hw_addrlen = dev_parse_header(entry->skb, |
| 217 | pmsg->hw_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | } |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 219 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | if (data_len) |
| 221 | if (skb_copy_bits(entry->skb, 0, pmsg->payload, data_len)) |
| 222 | BUG(); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 223 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | nlh->nlmsg_len = skb->tail - old_tail; |
| 225 | return skb; |
| 226 | |
| 227 | nlmsg_failure: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | *errp = -EINVAL; |
| 229 | printk(KERN_ERR "ip_queue: error creating packet message\n"); |
| 230 | return NULL; |
| 231 | } |
| 232 | |
| 233 | static int |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 234 | ipq_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | { |
| 236 | int status = -EINVAL; |
| 237 | struct sk_buff *nskb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | |
| 239 | if (copy_mode == IPQ_COPY_NONE) |
| 240 | return -EAGAIN; |
| 241 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | nskb = ipq_build_packet_message(entry, &status); |
| 243 | if (nskb == NULL) |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 244 | return status; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 245 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | write_lock_bh(&queue_lock); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 247 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | if (!peer_pid) |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 249 | goto err_out_free_nskb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | |
| 251 | if (queue_total >= queue_maxlen) { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 252 | queue_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | status = -ENOSPC; |
| 254 | if (net_ratelimit()) |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 255 | printk (KERN_WARNING "ip_queue: full at %d entries, " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | "dropping packets(s). Dropped: %d\n", queue_total, |
| 257 | queue_dropped); |
| 258 | goto err_out_free_nskb; |
| 259 | } |
| 260 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 261 | /* netlink_unicast will either free the nskb or attach it to a socket */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | status = netlink_unicast(ipqnl, nskb, peer_pid, MSG_DONTWAIT); |
| 263 | if (status < 0) { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 264 | queue_user_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | goto err_out_unlock; |
| 266 | } |
| 267 | |
| 268 | __ipq_enqueue_entry(entry); |
| 269 | |
| 270 | write_unlock_bh(&queue_lock); |
| 271 | return status; |
| 272 | |
| 273 | err_out_free_nskb: |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 274 | kfree_skb(nskb); |
| 275 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | err_out_unlock: |
| 277 | write_unlock_bh(&queue_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | return status; |
| 279 | } |
| 280 | |
| 281 | static int |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 282 | ipq_mangle_ipv4(ipq_verdict_msg_t *v, struct nf_queue_entry *e) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | { |
| 284 | int diff; |
| 285 | struct iphdr *user_iph = (struct iphdr *)v->payload; |
Patrick McHardy | e2b58a6 | 2008-02-19 17:17:52 -0800 | [diff] [blame] | 286 | struct sk_buff *nskb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | |
| 288 | if (v->data_len < sizeof(*user_iph)) |
| 289 | return 0; |
| 290 | diff = v->data_len - e->skb->len; |
Patrick McHardy | d8a585d | 2006-11-14 19:48:09 -0800 | [diff] [blame] | 291 | if (diff < 0) { |
| 292 | if (pskb_trim(e->skb, v->data_len)) |
| 293 | return -ENOMEM; |
| 294 | } else if (diff > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | if (v->data_len > 0xFFFF) |
| 296 | return -EINVAL; |
| 297 | if (diff > skb_tailroom(e->skb)) { |
Arnaud Ebalard | 9a732ed | 2008-04-29 03:16:34 -0700 | [diff] [blame] | 298 | nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), |
| 299 | diff, GFP_ATOMIC); |
Patrick McHardy | e2b58a6 | 2008-02-19 17:17:52 -0800 | [diff] [blame] | 300 | if (!nskb) { |
Herbert Xu | 2ca7b0a | 2007-10-14 00:39:55 -0700 | [diff] [blame] | 301 | printk(KERN_WARNING "ip_queue: error " |
Patrick McHardy | e2b58a6 | 2008-02-19 17:17:52 -0800 | [diff] [blame] | 302 | "in mangle, dropping packet\n"); |
| 303 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | } |
Patrick McHardy | e2b58a6 | 2008-02-19 17:17:52 -0800 | [diff] [blame] | 305 | kfree_skb(e->skb); |
| 306 | e->skb = nskb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | } |
| 308 | skb_put(e->skb, diff); |
| 309 | } |
Herbert Xu | 37d4187 | 2007-10-14 00:39:18 -0700 | [diff] [blame] | 310 | if (!skb_make_writable(e->skb, v->data_len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | return -ENOMEM; |
Arnaldo Carvalho de Melo | 27d7ff4 | 2007-03-31 11:55:19 -0300 | [diff] [blame] | 312 | skb_copy_to_linear_data(e->skb, v->payload, v->data_len); |
Patrick McHardy | 66a79a1 | 2005-08-23 10:10:35 -0700 | [diff] [blame] | 313 | e->skb->ip_summed = CHECKSUM_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | return 0; |
| 316 | } |
| 317 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | static int |
| 319 | ipq_set_verdict(struct ipq_verdict_msg *vmsg, unsigned int len) |
| 320 | { |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 321 | struct nf_queue_entry *entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | |
| 323 | if (vmsg->value > NF_MAX_VERDICT) |
| 324 | return -EINVAL; |
| 325 | |
Patrick McHardy | 9521409 | 2007-12-05 01:25:46 -0800 | [diff] [blame] | 326 | entry = ipq_find_dequeue_entry(vmsg->id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | if (entry == NULL) |
| 328 | return -ENOENT; |
| 329 | else { |
| 330 | int verdict = vmsg->value; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 331 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | if (vmsg->data_len && vmsg->data_len == len) |
| 333 | if (ipq_mangle_ipv4(vmsg, entry) < 0) |
| 334 | verdict = NF_DROP; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 335 | |
Patrick McHardy | 4b3d15e | 2007-12-05 01:27:02 -0800 | [diff] [blame] | 336 | nf_reinject(entry, verdict); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | return 0; |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | static int |
| 342 | ipq_set_mode(unsigned char mode, unsigned int range) |
| 343 | { |
| 344 | int status; |
| 345 | |
| 346 | write_lock_bh(&queue_lock); |
| 347 | status = __ipq_set_mode(mode, range); |
| 348 | write_unlock_bh(&queue_lock); |
| 349 | return status; |
| 350 | } |
| 351 | |
| 352 | static int |
| 353 | ipq_receive_peer(struct ipq_peer_msg *pmsg, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 354 | unsigned char type, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | { |
| 356 | int status = 0; |
| 357 | |
| 358 | if (len < sizeof(*pmsg)) |
| 359 | return -EINVAL; |
| 360 | |
| 361 | switch (type) { |
| 362 | case IPQM_MODE: |
| 363 | status = ipq_set_mode(pmsg->msg.mode.value, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 364 | pmsg->msg.mode.range); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | break; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 366 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | case IPQM_VERDICT: |
| 368 | if (pmsg->msg.verdict.value > NF_MAX_VERDICT) |
| 369 | status = -EINVAL; |
| 370 | else |
| 371 | status = ipq_set_verdict(&pmsg->msg.verdict, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 372 | len - sizeof(*pmsg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | break; |
| 374 | default: |
| 375 | status = -EINVAL; |
| 376 | } |
| 377 | return status; |
| 378 | } |
| 379 | |
| 380 | static int |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 381 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | { |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 383 | if (entry->indev) |
| 384 | if (entry->indev->ifindex == ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | return 1; |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 386 | if (entry->outdev) |
| 387 | if (entry->outdev->ifindex == ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | return 1; |
Patrick McHardy | ef47c6a7 | 2006-06-27 03:01:48 -0700 | [diff] [blame] | 389 | #ifdef CONFIG_BRIDGE_NETFILTER |
| 390 | if (entry->skb->nf_bridge) { |
| 391 | if (entry->skb->nf_bridge->physindev && |
| 392 | entry->skb->nf_bridge->physindev->ifindex == ifindex) |
| 393 | return 1; |
| 394 | if (entry->skb->nf_bridge->physoutdev && |
| 395 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 396 | return 1; |
Patrick McHardy | ef47c6a7 | 2006-06-27 03:01:48 -0700 | [diff] [blame] | 397 | } |
| 398 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | return 0; |
| 400 | } |
| 401 | |
| 402 | static void |
| 403 | ipq_dev_drop(int ifindex) |
| 404 | { |
Patrick McHardy | 9521409 | 2007-12-05 01:25:46 -0800 | [diff] [blame] | 405 | ipq_flush(dev_cmp, ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | } |
| 407 | |
| 408 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) |
| 409 | |
| 410 | static inline void |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 411 | __ipq_rcv_skb(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | { |
| 413 | int status, type, pid, flags, nlmsglen, skblen; |
| 414 | struct nlmsghdr *nlh; |
| 415 | |
| 416 | skblen = skb->len; |
| 417 | if (skblen < sizeof(*nlh)) |
| 418 | return; |
| 419 | |
Arnaldo Carvalho de Melo | b529ccf | 2007-04-25 19:08:35 -0700 | [diff] [blame] | 420 | nlh = nlmsg_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | nlmsglen = nlh->nlmsg_len; |
| 422 | if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen) |
| 423 | return; |
| 424 | |
| 425 | pid = nlh->nlmsg_pid; |
| 426 | flags = nlh->nlmsg_flags; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 427 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | if(pid <= 0 || !(flags & NLM_F_REQUEST) || flags & NLM_F_MULTI) |
| 429 | RCV_SKB_FAIL(-EINVAL); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 430 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | if (flags & MSG_TRUNC) |
| 432 | RCV_SKB_FAIL(-ECOMM); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 433 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | type = nlh->nlmsg_type; |
| 435 | if (type < NLMSG_NOOP || type >= IPQM_MAX) |
| 436 | RCV_SKB_FAIL(-EINVAL); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 437 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | if (type <= IPQM_BASE) |
| 439 | return; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 440 | |
Darrel Goeddel | c7bdb54 | 2006-06-27 13:26:11 -0700 | [diff] [blame] | 441 | if (security_netlink_recv(skb, CAP_NET_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | RCV_SKB_FAIL(-EPERM); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 443 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | write_lock_bh(&queue_lock); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 445 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | if (peer_pid) { |
| 447 | if (peer_pid != pid) { |
| 448 | write_unlock_bh(&queue_lock); |
| 449 | RCV_SKB_FAIL(-EBUSY); |
| 450 | } |
| 451 | } else { |
| 452 | net_enable_timestamp(); |
| 453 | peer_pid = pid; |
| 454 | } |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 455 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | write_unlock_bh(&queue_lock); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | status = ipq_receive_peer(NLMSG_DATA(nlh), type, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 459 | nlmsglen - NLMSG_LENGTH(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | if (status < 0) |
| 461 | RCV_SKB_FAIL(status); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 462 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | if (flags & NLM_F_ACK) |
| 464 | netlink_ack(skb, nlh, 0); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 465 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | } |
| 467 | |
| 468 | static void |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 469 | ipq_rcv_skb(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | { |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 471 | mutex_lock(&ipqnl_mutex); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 472 | __ipq_rcv_skb(skb); |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 473 | mutex_unlock(&ipqnl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | } |
| 475 | |
| 476 | static int |
| 477 | ipq_rcv_dev_event(struct notifier_block *this, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 478 | unsigned long event, void *ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | { |
| 480 | struct net_device *dev = ptr; |
| 481 | |
YOSHIFUJI Hideaki | 721499e | 2008-07-19 22:34:43 -0700 | [diff] [blame] | 482 | if (!net_eq(dev_net(dev), &init_net)) |
Eric W. Biederman | e9dc865 | 2007-09-12 13:02:17 +0200 | [diff] [blame] | 483 | return NOTIFY_DONE; |
| 484 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | /* Drop any packets associated with the downed device */ |
| 486 | if (event == NETDEV_DOWN) |
| 487 | ipq_dev_drop(dev->ifindex); |
| 488 | return NOTIFY_DONE; |
| 489 | } |
| 490 | |
| 491 | static struct notifier_block ipq_dev_notifier = { |
| 492 | .notifier_call = ipq_rcv_dev_event, |
| 493 | }; |
| 494 | |
| 495 | static int |
| 496 | ipq_rcv_nl_event(struct notifier_block *this, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 497 | unsigned long event, void *ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | { |
| 499 | struct netlink_notify *n = ptr; |
| 500 | |
Patrick McHardy | dee5817 | 2009-11-06 17:04:00 +0100 | [diff] [blame] | 501 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_FIREWALL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | write_lock_bh(&queue_lock); |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 503 | if ((net_eq(n->net, &init_net)) && (n->pid == peer_pid)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | __ipq_reset(); |
| 505 | write_unlock_bh(&queue_lock); |
| 506 | } |
| 507 | return NOTIFY_DONE; |
| 508 | } |
| 509 | |
| 510 | static struct notifier_block ipq_nl_notifier = { |
| 511 | .notifier_call = ipq_rcv_nl_event, |
| 512 | }; |
| 513 | |
Patrick McHardy | c392a74 | 2008-01-31 04:54:18 -0800 | [diff] [blame] | 514 | #ifdef CONFIG_SYSCTL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | static struct ctl_table_header *ipq_sysctl_header; |
| 516 | |
| 517 | static ctl_table ipq_table[] = { |
| 518 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | .procname = NET_IPQ_QMAX_NAME, |
| 520 | .data = &queue_maxlen, |
| 521 | .maxlen = sizeof(queue_maxlen), |
| 522 | .mode = 0644, |
| 523 | .proc_handler = proc_dointvec |
| 524 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 525 | { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | }; |
Patrick McHardy | c392a74 | 2008-01-31 04:54:18 -0800 | [diff] [blame] | 527 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | |
Patrick McHardy | c392a74 | 2008-01-31 04:54:18 -0800 | [diff] [blame] | 529 | #ifdef CONFIG_PROC_FS |
Alexey Dobriyan | 7351a22 | 2007-11-05 20:33:46 -0800 | [diff] [blame] | 530 | static int ip_queue_show(struct seq_file *m, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | read_lock_bh(&queue_lock); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 533 | |
Alexey Dobriyan | 7351a22 | 2007-11-05 20:33:46 -0800 | [diff] [blame] | 534 | seq_printf(m, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 535 | "Peer PID : %d\n" |
| 536 | "Copy mode : %hu\n" |
| 537 | "Copy range : %u\n" |
| 538 | "Queue length : %u\n" |
| 539 | "Queue max. length : %u\n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | "Queue dropped : %u\n" |
| 541 | "Netlink dropped : %u\n", |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 542 | peer_pid, |
| 543 | copy_mode, |
| 544 | copy_range, |
| 545 | queue_total, |
| 546 | queue_maxlen, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | queue_dropped, |
| 548 | queue_user_dropped); |
| 549 | |
| 550 | read_unlock_bh(&queue_lock); |
Alexey Dobriyan | 7351a22 | 2007-11-05 20:33:46 -0800 | [diff] [blame] | 551 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | } |
Alexey Dobriyan | 7351a22 | 2007-11-05 20:33:46 -0800 | [diff] [blame] | 553 | |
| 554 | static int ip_queue_open(struct inode *inode, struct file *file) |
| 555 | { |
| 556 | return single_open(file, ip_queue_show, NULL); |
| 557 | } |
| 558 | |
| 559 | static const struct file_operations ip_queue_proc_fops = { |
| 560 | .open = ip_queue_open, |
| 561 | .read = seq_read, |
| 562 | .llseek = seq_lseek, |
| 563 | .release = single_release, |
| 564 | .owner = THIS_MODULE, |
| 565 | }; |
Patrick McHardy | c392a74 | 2008-01-31 04:54:18 -0800 | [diff] [blame] | 566 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | |
Patrick McHardy | e3ac529 | 2007-12-05 01:23:57 -0800 | [diff] [blame] | 568 | static const struct nf_queue_handler nfqh = { |
Harald Welte | bbd86b9f | 2005-08-09 20:23:11 -0700 | [diff] [blame] | 569 | .name = "ip_queue", |
| 570 | .outfn = &ipq_enqueue_packet, |
| 571 | }; |
| 572 | |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 573 | static int __init ip_queue_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | { |
| 575 | int status = -ENOMEM; |
Patrick McHardy | c392a74 | 2008-01-31 04:54:18 -0800 | [diff] [blame] | 576 | struct proc_dir_entry *proc __maybe_unused; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 577 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | netlink_register_notifier(&ipq_nl_notifier); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 579 | ipqnl = netlink_kernel_create(&init_net, NETLINK_FIREWALL, 0, |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 580 | ipq_rcv_skb, NULL, THIS_MODULE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | if (ipqnl == NULL) { |
| 582 | printk(KERN_ERR "ip_queue: failed to create netlink socket\n"); |
| 583 | goto cleanup_netlink_notifier; |
| 584 | } |
| 585 | |
Patrick McHardy | c392a74 | 2008-01-31 04:54:18 -0800 | [diff] [blame] | 586 | #ifdef CONFIG_PROC_FS |
Denis V. Lunev | 8eeee8b | 2008-03-27 16:55:53 -0700 | [diff] [blame] | 587 | proc = proc_create(IPQ_PROC_FS_NAME, 0, init_net.proc_net, |
| 588 | &ip_queue_proc_fops); |
| 589 | if (!proc) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | printk(KERN_ERR "ip_queue: failed to create proc entry\n"); |
| 591 | goto cleanup_ipqnl; |
| 592 | } |
Patrick McHardy | c392a74 | 2008-01-31 04:54:18 -0800 | [diff] [blame] | 593 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | register_netdevice_notifier(&ipq_dev_notifier); |
Patrick McHardy | c392a74 | 2008-01-31 04:54:18 -0800 | [diff] [blame] | 595 | #ifdef CONFIG_SYSCTL |
Pavel Emelyanov | 3d7cc2b | 2008-01-09 00:33:11 -0800 | [diff] [blame] | 596 | ipq_sysctl_header = register_sysctl_paths(net_ipv4_ctl_path, ipq_table); |
Patrick McHardy | c392a74 | 2008-01-31 04:54:18 -0800 | [diff] [blame] | 597 | #endif |
Jan Engelhardt | 4b1e27e | 2009-04-14 14:26:49 +0200 | [diff] [blame] | 598 | status = nf_register_queue_handler(NFPROTO_IPV4, &nfqh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | if (status < 0) { |
| 600 | printk(KERN_ERR "ip_queue: failed to register queue handler\n"); |
| 601 | goto cleanup_sysctl; |
| 602 | } |
| 603 | return status; |
| 604 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | cleanup_sysctl: |
Patrick McHardy | c392a74 | 2008-01-31 04:54:18 -0800 | [diff] [blame] | 606 | #ifdef CONFIG_SYSCTL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | unregister_sysctl_table(ipq_sysctl_header); |
Patrick McHardy | c392a74 | 2008-01-31 04:54:18 -0800 | [diff] [blame] | 608 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | unregister_netdevice_notifier(&ipq_dev_notifier); |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 610 | proc_net_remove(&init_net, IPQ_PROC_FS_NAME); |
Patrick McHardy | c392a74 | 2008-01-31 04:54:18 -0800 | [diff] [blame] | 611 | cleanup_ipqnl: __maybe_unused |
Denis V. Lunev | b7c6ba6 | 2008-01-28 14:41:19 -0800 | [diff] [blame] | 612 | netlink_kernel_release(ipqnl); |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 613 | mutex_lock(&ipqnl_mutex); |
| 614 | mutex_unlock(&ipqnl_mutex); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 615 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | cleanup_netlink_notifier: |
| 617 | netlink_unregister_notifier(&ipq_nl_notifier); |
| 618 | return status; |
| 619 | } |
| 620 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 621 | static void __exit ip_queue_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | { |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 623 | nf_unregister_queue_handlers(&nfqh); |
Eric Dumazet | 9481721 | 2009-11-04 21:14:31 +0100 | [diff] [blame] | 624 | |
Patrick McHardy | 9521409 | 2007-12-05 01:25:46 -0800 | [diff] [blame] | 625 | ipq_flush(NULL, 0); |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 626 | |
Patrick McHardy | c392a74 | 2008-01-31 04:54:18 -0800 | [diff] [blame] | 627 | #ifdef CONFIG_SYSCTL |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 628 | unregister_sysctl_table(ipq_sysctl_header); |
Patrick McHardy | c392a74 | 2008-01-31 04:54:18 -0800 | [diff] [blame] | 629 | #endif |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 630 | unregister_netdevice_notifier(&ipq_dev_notifier); |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 631 | proc_net_remove(&init_net, IPQ_PROC_FS_NAME); |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 632 | |
Denis V. Lunev | b7c6ba6 | 2008-01-28 14:41:19 -0800 | [diff] [blame] | 633 | netlink_kernel_release(ipqnl); |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 634 | mutex_lock(&ipqnl_mutex); |
| 635 | mutex_unlock(&ipqnl_mutex); |
| 636 | |
| 637 | netlink_unregister_notifier(&ipq_nl_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | } |
| 639 | |
| 640 | MODULE_DESCRIPTION("IPv4 packet queue handler"); |
| 641 | MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>"); |
| 642 | MODULE_LICENSE("GPL"); |
Scott James Remnant | 95ba434 | 2009-03-16 15:31:10 +0100 | [diff] [blame] | 643 | MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_FIREWALL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 645 | module_init(ip_queue_init); |
| 646 | module_exit(ip_queue_fini); |