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Commit | Line | Data |
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7af4cc3f HW |
1 | /* |
2 | * This is a module which is used for queueing packets and communicating with | |
67137f3c | 3 | * userspace via nfnetlink. |
7af4cc3f HW |
4 | * |
5 | * (C) 2005 by Harald Welte <laforge@netfilter.org> | |
4ad9d4fa | 6 | * (C) 2007 by Patrick McHardy <kaber@trash.net> |
7af4cc3f HW |
7 | * |
8 | * Based on the old ipv4-only ip_queue.c: | |
9 | * (C) 2000-2002 James Morris <jmorris@intercode.com.au> | |
10 | * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License version 2 as | |
14 | * published by the Free Software Foundation. | |
15 | * | |
16 | */ | |
17 | #include <linux/module.h> | |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/spinlock.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
7af4cc3f HW |
22 | #include <linux/notifier.h> |
23 | #include <linux/netdevice.h> | |
24 | #include <linux/netfilter.h> | |
838ab636 | 25 | #include <linux/proc_fs.h> |
7af4cc3f HW |
26 | #include <linux/netfilter_ipv4.h> |
27 | #include <linux/netfilter_ipv6.h> | |
28 | #include <linux/netfilter/nfnetlink.h> | |
29 | #include <linux/netfilter/nfnetlink_queue.h> | |
30 | #include <linux/list.h> | |
31 | #include <net/sock.h> | |
c01cd429 | 32 | #include <net/netfilter/nf_queue.h> |
7c622345 | 33 | #include <net/netfilter/nfnetlink_queue.h> |
7af4cc3f | 34 | |
60063497 | 35 | #include <linux/atomic.h> |
7af4cc3f | 36 | |
fbcd923c HW |
37 | #ifdef CONFIG_BRIDGE_NETFILTER |
38 | #include "../bridge/br_private.h" | |
39 | #endif | |
40 | ||
7af4cc3f HW |
41 | #define NFQNL_QMAX_DEFAULT 1024 |
42 | ||
7af4cc3f HW |
43 | struct nfqnl_instance { |
44 | struct hlist_node hlist; /* global list of queues */ | |
9872bec7 | 45 | struct rcu_head rcu; |
7af4cc3f | 46 | |
15e47304 | 47 | int peer_portid; |
7af4cc3f HW |
48 | unsigned int queue_maxlen; |
49 | unsigned int copy_range; | |
7af4cc3f HW |
50 | unsigned int queue_dropped; |
51 | unsigned int queue_user_dropped; | |
52 | ||
7af4cc3f HW |
53 | |
54 | u_int16_t queue_num; /* number of this queue */ | |
55 | u_int8_t copy_mode; | |
fdb694a0 | 56 | u_int32_t flags; /* Set using NFQA_CFG_FLAGS */ |
c463ac97 ED |
57 | /* |
58 | * Following fields are dirtied for each queued packet, | |
59 | * keep them in same cache line if possible. | |
60 | */ | |
61 | spinlock_t lock; | |
62 | unsigned int queue_total; | |
5863702a | 63 | unsigned int id_sequence; /* 'sequence' of pkt ids */ |
7af4cc3f HW |
64 | struct list_head queue_list; /* packets in queue */ |
65 | }; | |
66 | ||
02f014d8 | 67 | typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long); |
7af4cc3f | 68 | |
9872bec7 | 69 | static DEFINE_SPINLOCK(instances_lock); |
7af4cc3f | 70 | |
7af4cc3f | 71 | #define INSTANCE_BUCKETS 16 |
9d6023ab | 72 | static struct hlist_head instance_table[INSTANCE_BUCKETS] __read_mostly; |
7af4cc3f HW |
73 | |
74 | static inline u_int8_t instance_hashfn(u_int16_t queue_num) | |
75 | { | |
1cdb0905 | 76 | return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS; |
7af4cc3f HW |
77 | } |
78 | ||
79 | static struct nfqnl_instance * | |
9872bec7 | 80 | instance_lookup(u_int16_t queue_num) |
7af4cc3f HW |
81 | { |
82 | struct hlist_head *head; | |
7af4cc3f HW |
83 | struct nfqnl_instance *inst; |
84 | ||
85 | head = &instance_table[instance_hashfn(queue_num)]; | |
b67bfe0d | 86 | hlist_for_each_entry_rcu(inst, head, hlist) { |
7af4cc3f HW |
87 | if (inst->queue_num == queue_num) |
88 | return inst; | |
89 | } | |
90 | return NULL; | |
91 | } | |
92 | ||
7af4cc3f | 93 | static struct nfqnl_instance * |
15e47304 | 94 | instance_create(u_int16_t queue_num, int portid) |
7af4cc3f | 95 | { |
baab2ce7 | 96 | struct nfqnl_instance *inst; |
9872bec7 | 97 | unsigned int h; |
baab2ce7 | 98 | int err; |
7af4cc3f | 99 | |
9872bec7 | 100 | spin_lock(&instances_lock); |
baab2ce7 PM |
101 | if (instance_lookup(queue_num)) { |
102 | err = -EEXIST; | |
7af4cc3f | 103 | goto out_unlock; |
baab2ce7 | 104 | } |
7af4cc3f | 105 | |
10dfdc69 | 106 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
107 | if (!inst) { |
108 | err = -ENOMEM; | |
7af4cc3f | 109 | goto out_unlock; |
baab2ce7 | 110 | } |
7af4cc3f | 111 | |
7af4cc3f | 112 | inst->queue_num = queue_num; |
15e47304 | 113 | inst->peer_portid = portid; |
7af4cc3f HW |
114 | inst->queue_maxlen = NFQNL_QMAX_DEFAULT; |
115 | inst->copy_range = 0xfffff; | |
116 | inst->copy_mode = NFQNL_COPY_NONE; | |
181a46a5 | 117 | spin_lock_init(&inst->lock); |
7af4cc3f HW |
118 | INIT_LIST_HEAD(&inst->queue_list); |
119 | ||
baab2ce7 PM |
120 | if (!try_module_get(THIS_MODULE)) { |
121 | err = -EAGAIN; | |
7af4cc3f | 122 | goto out_free; |
baab2ce7 | 123 | } |
7af4cc3f | 124 | |
9872bec7 PM |
125 | h = instance_hashfn(queue_num); |
126 | hlist_add_head_rcu(&inst->hlist, &instance_table[h]); | |
7af4cc3f | 127 | |
9872bec7 | 128 | spin_unlock(&instances_lock); |
7af4cc3f | 129 | |
7af4cc3f HW |
130 | return inst; |
131 | ||
132 | out_free: | |
133 | kfree(inst); | |
134 | out_unlock: | |
9872bec7 | 135 | spin_unlock(&instances_lock); |
baab2ce7 | 136 | return ERR_PTR(err); |
7af4cc3f HW |
137 | } |
138 | ||
b43d8d85 PM |
139 | static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, |
140 | unsigned long data); | |
7af4cc3f HW |
141 | |
142 | static void | |
9872bec7 | 143 | instance_destroy_rcu(struct rcu_head *head) |
7af4cc3f | 144 | { |
9872bec7 PM |
145 | struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance, |
146 | rcu); | |
7af4cc3f | 147 | |
b43d8d85 | 148 | nfqnl_flush(inst, NULL, 0); |
9872bec7 | 149 | kfree(inst); |
7af4cc3f HW |
150 | module_put(THIS_MODULE); |
151 | } | |
152 | ||
9872bec7 | 153 | static void |
7af4cc3f HW |
154 | __instance_destroy(struct nfqnl_instance *inst) |
155 | { | |
9872bec7 PM |
156 | hlist_del_rcu(&inst->hlist); |
157 | call_rcu(&inst->rcu, instance_destroy_rcu); | |
7af4cc3f HW |
158 | } |
159 | ||
9872bec7 | 160 | static void |
7af4cc3f HW |
161 | instance_destroy(struct nfqnl_instance *inst) |
162 | { | |
9872bec7 PM |
163 | spin_lock(&instances_lock); |
164 | __instance_destroy(inst); | |
165 | spin_unlock(&instances_lock); | |
7af4cc3f HW |
166 | } |
167 | ||
7af4cc3f | 168 | static inline void |
02f014d8 | 169 | __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) |
7af4cc3f | 170 | { |
0ac41e81 | 171 | list_add_tail(&entry->list, &queue->queue_list); |
7af4cc3f HW |
172 | queue->queue_total++; |
173 | } | |
174 | ||
97d32cf9 FW |
175 | static void |
176 | __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) | |
177 | { | |
178 | list_del(&entry->list); | |
179 | queue->queue_total--; | |
180 | } | |
181 | ||
02f014d8 | 182 | static struct nf_queue_entry * |
b43d8d85 | 183 | find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id) |
7af4cc3f | 184 | { |
02f014d8 | 185 | struct nf_queue_entry *entry = NULL, *i; |
601e68e1 | 186 | |
7af4cc3f | 187 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
188 | |
189 | list_for_each_entry(i, &queue->queue_list, list) { | |
190 | if (i->id == id) { | |
191 | entry = i; | |
192 | break; | |
193 | } | |
194 | } | |
195 | ||
97d32cf9 FW |
196 | if (entry) |
197 | __dequeue_entry(queue, entry); | |
b43d8d85 | 198 | |
7af4cc3f HW |
199 | spin_unlock_bh(&queue->lock); |
200 | ||
201 | return entry; | |
202 | } | |
203 | ||
204 | static void | |
b43d8d85 | 205 | nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) |
7af4cc3f | 206 | { |
02f014d8 | 207 | struct nf_queue_entry *entry, *next; |
b43d8d85 | 208 | |
7af4cc3f | 209 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
210 | list_for_each_entry_safe(entry, next, &queue->queue_list, list) { |
211 | if (!cmpfn || cmpfn(entry, data)) { | |
212 | list_del(&entry->list); | |
213 | queue->queue_total--; | |
4b3d15ef | 214 | nf_reinject(entry, NF_DROP); |
b43d8d85 PM |
215 | } |
216 | } | |
7af4cc3f HW |
217 | spin_unlock_bh(&queue->lock); |
218 | } | |
219 | ||
220 | static struct sk_buff * | |
221 | nfqnl_build_packet_message(struct nfqnl_instance *queue, | |
5863702a ED |
222 | struct nf_queue_entry *entry, |
223 | __be32 **packet_id_ptr) | |
7af4cc3f | 224 | { |
27a884dc | 225 | sk_buff_data_t old_tail; |
7af4cc3f | 226 | size_t size; |
6ee584be | 227 | size_t data_len = 0, cap_len = 0; |
7af4cc3f | 228 | struct sk_buff *skb; |
5863702a ED |
229 | struct nlattr *nla; |
230 | struct nfqnl_msg_packet_hdr *pmsg; | |
7af4cc3f HW |
231 | struct nlmsghdr *nlh; |
232 | struct nfgenmsg *nfmsg; | |
3e4ead4f JJ |
233 | struct sk_buff *entskb = entry->skb; |
234 | struct net_device *indev; | |
235 | struct net_device *outdev; | |
9cb01766 PNA |
236 | struct nf_conn *ct = NULL; |
237 | enum ip_conntrack_info uninitialized_var(ctinfo); | |
7af4cc3f | 238 | |
cabaa9bf | 239 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) |
df6fb868 PM |
240 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) |
241 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
242 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 243 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
244 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
245 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 246 | #endif |
df6fb868 PM |
247 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
248 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) | |
6ee584be PNA |
249 | + nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp) |
250 | + nla_total_size(sizeof(u_int32_t))); /* cap_len */ | |
7af4cc3f | 251 | |
02f014d8 | 252 | outdev = entry->outdev; |
3e4ead4f | 253 | |
c463ac97 | 254 | switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) { |
7af4cc3f HW |
255 | case NFQNL_COPY_META: |
256 | case NFQNL_COPY_NONE: | |
7af4cc3f | 257 | break; |
601e68e1 | 258 | |
7af4cc3f | 259 | case NFQNL_COPY_PACKET: |
e9f13cab | 260 | if (entskb->ip_summed == CHECKSUM_PARTIAL && |
c463ac97 | 261 | skb_checksum_help(entskb)) |
e7dfb09a | 262 | return NULL; |
c463ac97 ED |
263 | |
264 | data_len = ACCESS_ONCE(queue->copy_range); | |
265 | if (data_len == 0 || data_len > entskb->len) | |
3e4ead4f | 266 | data_len = entskb->len; |
601e68e1 | 267 | |
df6fb868 | 268 | size += nla_total_size(data_len); |
6ee584be | 269 | cap_len = entskb->len; |
7af4cc3f | 270 | break; |
7af4cc3f HW |
271 | } |
272 | ||
7c622345 PNA |
273 | if (queue->flags & NFQA_CFG_F_CONNTRACK) |
274 | ct = nfqnl_ct_get(entskb, &size, &ctinfo); | |
7af4cc3f HW |
275 | |
276 | skb = alloc_skb(size, GFP_ATOMIC); | |
277 | if (!skb) | |
3da07c0c | 278 | return NULL; |
601e68e1 | 279 | |
27a884dc | 280 | old_tail = skb->tail; |
3da07c0c | 281 | nlh = nlmsg_put(skb, 0, 0, |
7af4cc3f | 282 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, |
3da07c0c DM |
283 | sizeof(struct nfgenmsg), 0); |
284 | if (!nlh) { | |
285 | kfree_skb(skb); | |
286 | return NULL; | |
287 | } | |
288 | nfmsg = nlmsg_data(nlh); | |
02f014d8 | 289 | nfmsg->nfgen_family = entry->pf; |
7af4cc3f HW |
290 | nfmsg->version = NFNETLINK_V0; |
291 | nfmsg->res_id = htons(queue->queue_num); | |
292 | ||
5863702a ED |
293 | nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); |
294 | pmsg = nla_data(nla); | |
295 | pmsg->hw_protocol = entskb->protocol; | |
296 | pmsg->hook = entry->hook; | |
297 | *packet_id_ptr = &pmsg->packet_id; | |
7af4cc3f | 298 | |
02f014d8 | 299 | indev = entry->indev; |
3e4ead4f | 300 | if (indev) { |
fbcd923c | 301 | #ifndef CONFIG_BRIDGE_NETFILTER |
a447189e DM |
302 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) |
303 | goto nla_put_failure; | |
fbcd923c | 304 | #else |
02f014d8 | 305 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 306 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 307 | * look for bridge group (when called from |
fbcd923c | 308 | * netfilter_bridge) */ |
a447189e DM |
309 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
310 | htonl(indev->ifindex)) || | |
fbcd923c | 311 | /* this is the bridge group "brX" */ |
f350a0a8 | 312 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
313 | nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
314 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
315 | goto nla_put_failure; | |
fbcd923c HW |
316 | } else { |
317 | /* Case 2: indev is bridge group, we need to look for | |
318 | * physical device (when called from ipv4) */ | |
a447189e DM |
319 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
320 | htonl(indev->ifindex))) | |
321 | goto nla_put_failure; | |
322 | if (entskb->nf_bridge && entskb->nf_bridge->physindev && | |
323 | nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, | |
324 | htonl(entskb->nf_bridge->physindev->ifindex))) | |
325 | goto nla_put_failure; | |
fbcd923c HW |
326 | } |
327 | #endif | |
7af4cc3f HW |
328 | } |
329 | ||
3e4ead4f | 330 | if (outdev) { |
fbcd923c | 331 | #ifndef CONFIG_BRIDGE_NETFILTER |
a447189e DM |
332 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) |
333 | goto nla_put_failure; | |
fbcd923c | 334 | #else |
02f014d8 | 335 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 336 | /* Case 1: outdev is physical output device, we need to |
601e68e1 | 337 | * look for bridge group (when called from |
fbcd923c | 338 | * netfilter_bridge) */ |
a447189e DM |
339 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
340 | htonl(outdev->ifindex)) || | |
fbcd923c | 341 | /* this is the bridge group "brX" */ |
f350a0a8 | 342 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
343 | nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
344 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
345 | goto nla_put_failure; | |
fbcd923c HW |
346 | } else { |
347 | /* Case 2: outdev is bridge group, we need to look for | |
348 | * physical output device (when called from ipv4) */ | |
a447189e DM |
349 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
350 | htonl(outdev->ifindex))) | |
351 | goto nla_put_failure; | |
352 | if (entskb->nf_bridge && entskb->nf_bridge->physoutdev && | |
353 | nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, | |
354 | htonl(entskb->nf_bridge->physoutdev->ifindex))) | |
355 | goto nla_put_failure; | |
fbcd923c HW |
356 | } |
357 | #endif | |
7af4cc3f HW |
358 | } |
359 | ||
a447189e DM |
360 | if (entskb->mark && |
361 | nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) | |
362 | goto nla_put_failure; | |
7af4cc3f | 363 | |
2c38de4c NC |
364 | if (indev && entskb->dev && |
365 | entskb->mac_header != entskb->network_header) { | |
7af4cc3f | 366 | struct nfqnl_msg_packet_hw phw; |
b95cce35 SH |
367 | int len = dev_parse_header(entskb, phw.hw_addr); |
368 | if (len) { | |
369 | phw.hw_addrlen = htons(len); | |
a447189e DM |
370 | if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) |
371 | goto nla_put_failure; | |
b95cce35 | 372 | } |
7af4cc3f HW |
373 | } |
374 | ||
b7aa0bf7 | 375 | if (entskb->tstamp.tv64) { |
7af4cc3f | 376 | struct nfqnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
377 | struct timeval tv = ktime_to_timeval(entskb->tstamp); |
378 | ts.sec = cpu_to_be64(tv.tv_sec); | |
379 | ts.usec = cpu_to_be64(tv.tv_usec); | |
7af4cc3f | 380 | |
a447189e DM |
381 | if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) |
382 | goto nla_put_failure; | |
7af4cc3f HW |
383 | } |
384 | ||
385 | if (data_len) { | |
df6fb868 | 386 | struct nlattr *nla; |
ca7c48ca | 387 | int sz = nla_attr_size(data_len); |
7af4cc3f | 388 | |
df6fb868 | 389 | if (skb_tailroom(skb) < nla_total_size(data_len)) { |
7af4cc3f | 390 | printk(KERN_WARNING "nf_queue: no tailroom!\n"); |
3da07c0c DM |
391 | kfree_skb(skb); |
392 | return NULL; | |
7af4cc3f HW |
393 | } |
394 | ||
df6fb868 PM |
395 | nla = (struct nlattr *)skb_put(skb, nla_total_size(data_len)); |
396 | nla->nla_type = NFQA_PAYLOAD; | |
ca7c48ca | 397 | nla->nla_len = sz; |
7af4cc3f | 398 | |
df6fb868 | 399 | if (skb_copy_bits(entskb, 0, nla_data(nla), data_len)) |
7af4cc3f HW |
400 | BUG(); |
401 | } | |
601e68e1 | 402 | |
7c622345 PNA |
403 | if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0) |
404 | goto nla_put_failure; | |
9cb01766 | 405 | |
6ee584be PNA |
406 | if (cap_len > 0 && nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) |
407 | goto nla_put_failure; | |
408 | ||
7af4cc3f HW |
409 | nlh->nlmsg_len = skb->tail - old_tail; |
410 | return skb; | |
411 | ||
df6fb868 | 412 | nla_put_failure: |
a6729955 | 413 | kfree_skb(skb); |
e87cc472 | 414 | net_err_ratelimited("nf_queue: error creating packet message\n"); |
7af4cc3f HW |
415 | return NULL; |
416 | } | |
417 | ||
418 | static int | |
02f014d8 | 419 | nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) |
7af4cc3f | 420 | { |
7af4cc3f HW |
421 | struct sk_buff *nskb; |
422 | struct nfqnl_instance *queue; | |
f1585086 | 423 | int err = -ENOBUFS; |
5863702a | 424 | __be32 *packet_id_ptr; |
fdb694a0 | 425 | int failopen = 0; |
7af4cc3f | 426 | |
9872bec7 PM |
427 | /* rcu_read_lock()ed by nf_hook_slow() */ |
428 | queue = instance_lookup(queuenum); | |
f1585086 FW |
429 | if (!queue) { |
430 | err = -ESRCH; | |
0ef0f465 | 431 | goto err_out; |
f1585086 | 432 | } |
7af4cc3f | 433 | |
f1585086 FW |
434 | if (queue->copy_mode == NFQNL_COPY_NONE) { |
435 | err = -EINVAL; | |
0ef0f465 | 436 | goto err_out; |
f1585086 | 437 | } |
7af4cc3f | 438 | |
5863702a | 439 | nskb = nfqnl_build_packet_message(queue, entry, &packet_id_ptr); |
f1585086 FW |
440 | if (nskb == NULL) { |
441 | err = -ENOMEM; | |
0ef0f465 | 442 | goto err_out; |
f1585086 | 443 | } |
7af4cc3f | 444 | spin_lock_bh(&queue->lock); |
601e68e1 | 445 | |
15e47304 | 446 | if (!queue->peer_portid) { |
f1585086 | 447 | err = -EINVAL; |
601e68e1 | 448 | goto err_out_free_nskb; |
f1585086 | 449 | } |
7af4cc3f | 450 | if (queue->queue_total >= queue->queue_maxlen) { |
fdb694a0 KK |
451 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
452 | failopen = 1; | |
453 | err = 0; | |
454 | } else { | |
455 | queue->queue_dropped++; | |
456 | net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", | |
457 | queue->queue_total); | |
458 | } | |
7af4cc3f HW |
459 | goto err_out_free_nskb; |
460 | } | |
5863702a ED |
461 | entry->id = ++queue->id_sequence; |
462 | *packet_id_ptr = htonl(entry->id); | |
7af4cc3f HW |
463 | |
464 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
15e47304 | 465 | err = nfnetlink_unicast(nskb, &init_net, queue->peer_portid, MSG_DONTWAIT); |
0ef0f465 | 466 | if (err < 0) { |
601e68e1 | 467 | queue->queue_user_dropped++; |
7af4cc3f HW |
468 | goto err_out_unlock; |
469 | } | |
470 | ||
471 | __enqueue_entry(queue, entry); | |
472 | ||
473 | spin_unlock_bh(&queue->lock); | |
0ef0f465 | 474 | return 0; |
7af4cc3f HW |
475 | |
476 | err_out_free_nskb: | |
601e68e1 | 477 | kfree_skb(nskb); |
7af4cc3f HW |
478 | err_out_unlock: |
479 | spin_unlock_bh(&queue->lock); | |
fdb694a0 KK |
480 | if (failopen) |
481 | nf_reinject(entry, NF_ACCEPT); | |
0ef0f465 | 482 | err_out: |
f1585086 | 483 | return err; |
7af4cc3f HW |
484 | } |
485 | ||
486 | static int | |
8c88f87c | 487 | nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) |
7af4cc3f | 488 | { |
e2b58a67 | 489 | struct sk_buff *nskb; |
7af4cc3f | 490 | |
d8a585d7 PM |
491 | if (diff < 0) { |
492 | if (pskb_trim(e->skb, data_len)) | |
493 | return -ENOMEM; | |
494 | } else if (diff > 0) { | |
7af4cc3f HW |
495 | if (data_len > 0xFFFF) |
496 | return -EINVAL; | |
497 | if (diff > skb_tailroom(e->skb)) { | |
9a732ed6 AE |
498 | nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), |
499 | diff, GFP_ATOMIC); | |
e2b58a67 | 500 | if (!nskb) { |
1158ba27 | 501 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f | 502 | "in mangle, dropping packet\n"); |
e2b58a67 | 503 | return -ENOMEM; |
7af4cc3f | 504 | } |
e2b58a67 PM |
505 | kfree_skb(e->skb); |
506 | e->skb = nskb; | |
7af4cc3f HW |
507 | } |
508 | skb_put(e->skb, diff); | |
509 | } | |
37d41879 | 510 | if (!skb_make_writable(e->skb, data_len)) |
7af4cc3f | 511 | return -ENOMEM; |
27d7ff46 | 512 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 513 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
514 | return 0; |
515 | } | |
516 | ||
7af4cc3f HW |
517 | static int |
518 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
519 | unsigned char mode, unsigned int range) | |
520 | { | |
c5de0dfd | 521 | int status = 0; |
7af4cc3f HW |
522 | |
523 | spin_lock_bh(&queue->lock); | |
c5de0dfd PM |
524 | switch (mode) { |
525 | case NFQNL_COPY_NONE: | |
526 | case NFQNL_COPY_META: | |
527 | queue->copy_mode = mode; | |
528 | queue->copy_range = 0; | |
529 | break; | |
530 | ||
531 | case NFQNL_COPY_PACKET: | |
532 | queue->copy_mode = mode; | |
ba8d3b0b PNA |
533 | /* We're using struct nlattr which has 16bit nla_len. Note that |
534 | * nla_len includes the header length. Thus, the maximum packet | |
535 | * length that we support is 65531 bytes. We send truncated | |
536 | * packets if the specified length is larger than that. | |
537 | */ | |
538 | if (range > 0xffff - NLA_HDRLEN) | |
539 | queue->copy_range = 0xffff - NLA_HDRLEN; | |
c5de0dfd PM |
540 | else |
541 | queue->copy_range = range; | |
542 | break; | |
543 | ||
544 | default: | |
545 | status = -EINVAL; | |
546 | ||
547 | } | |
7af4cc3f HW |
548 | spin_unlock_bh(&queue->lock); |
549 | ||
550 | return status; | |
551 | } | |
552 | ||
553 | static int | |
02f014d8 | 554 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
7af4cc3f | 555 | { |
02f014d8 PM |
556 | if (entry->indev) |
557 | if (entry->indev->ifindex == ifindex) | |
7af4cc3f | 558 | return 1; |
02f014d8 PM |
559 | if (entry->outdev) |
560 | if (entry->outdev->ifindex == ifindex) | |
7af4cc3f | 561 | return 1; |
ef47c6a7 PM |
562 | #ifdef CONFIG_BRIDGE_NETFILTER |
563 | if (entry->skb->nf_bridge) { | |
564 | if (entry->skb->nf_bridge->physindev && | |
565 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
566 | return 1; | |
567 | if (entry->skb->nf_bridge->physoutdev && | |
568 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
569 | return 1; | |
570 | } | |
571 | #endif | |
7af4cc3f HW |
572 | return 0; |
573 | } | |
574 | ||
575 | /* drop all packets with either indev or outdev == ifindex from all queue | |
576 | * instances */ | |
577 | static void | |
578 | nfqnl_dev_drop(int ifindex) | |
579 | { | |
580 | int i; | |
601e68e1 | 581 | |
9872bec7 | 582 | rcu_read_lock(); |
7af4cc3f | 583 | |
9872bec7 | 584 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
7af4cc3f HW |
585 | struct nfqnl_instance *inst; |
586 | struct hlist_head *head = &instance_table[i]; | |
587 | ||
b67bfe0d | 588 | hlist_for_each_entry_rcu(inst, head, hlist) |
b43d8d85 | 589 | nfqnl_flush(inst, dev_cmp, ifindex); |
7af4cc3f HW |
590 | } |
591 | ||
9872bec7 | 592 | rcu_read_unlock(); |
7af4cc3f HW |
593 | } |
594 | ||
595 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
596 | ||
597 | static int | |
598 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
599 | unsigned long event, void *ptr) | |
600 | { | |
601 | struct net_device *dev = ptr; | |
602 | ||
721499e8 | 603 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
604 | return NOTIFY_DONE; |
605 | ||
7af4cc3f HW |
606 | /* Drop any packets associated with the downed device */ |
607 | if (event == NETDEV_DOWN) | |
608 | nfqnl_dev_drop(dev->ifindex); | |
609 | return NOTIFY_DONE; | |
610 | } | |
611 | ||
612 | static struct notifier_block nfqnl_dev_notifier = { | |
613 | .notifier_call = nfqnl_rcv_dev_event, | |
614 | }; | |
615 | ||
616 | static int | |
617 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
618 | unsigned long event, void *ptr) | |
619 | { | |
620 | struct netlink_notify *n = ptr; | |
621 | ||
dee5817e | 622 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
7af4cc3f HW |
623 | int i; |
624 | ||
15e47304 | 625 | /* destroy all instances for this portid */ |
9872bec7 PM |
626 | spin_lock(&instances_lock); |
627 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
b67bfe0d | 628 | struct hlist_node *t2; |
7af4cc3f HW |
629 | struct nfqnl_instance *inst; |
630 | struct hlist_head *head = &instance_table[i]; | |
631 | ||
b67bfe0d | 632 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
b4b51029 | 633 | if ((n->net == &init_net) && |
15e47304 | 634 | (n->portid == inst->peer_portid)) |
7af4cc3f HW |
635 | __instance_destroy(inst); |
636 | } | |
637 | } | |
9872bec7 | 638 | spin_unlock(&instances_lock); |
7af4cc3f HW |
639 | } |
640 | return NOTIFY_DONE; | |
641 | } | |
642 | ||
643 | static struct notifier_block nfqnl_rtnl_notifier = { | |
644 | .notifier_call = nfqnl_rcv_nl_event, | |
645 | }; | |
646 | ||
5bf75853 PM |
647 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
648 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
649 | [NFQA_MARK] = { .type = NLA_U32 }, | |
650 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
9cb01766 | 651 | [NFQA_CT] = { .type = NLA_UNSPEC }, |
838ab636 HW |
652 | }; |
653 | ||
97d32cf9 FW |
654 | static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { |
655 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
656 | [NFQA_MARK] = { .type = NLA_U32 }, | |
657 | }; | |
658 | ||
15e47304 | 659 | static struct nfqnl_instance *verdict_instance_lookup(u16 queue_num, int nlportid) |
97d32cf9 FW |
660 | { |
661 | struct nfqnl_instance *queue; | |
662 | ||
663 | queue = instance_lookup(queue_num); | |
664 | if (!queue) | |
665 | return ERR_PTR(-ENODEV); | |
666 | ||
15e47304 | 667 | if (queue->peer_portid != nlportid) |
97d32cf9 FW |
668 | return ERR_PTR(-EPERM); |
669 | ||
670 | return queue; | |
671 | } | |
672 | ||
673 | static struct nfqnl_msg_verdict_hdr* | |
674 | verdicthdr_get(const struct nlattr * const nfqa[]) | |
675 | { | |
676 | struct nfqnl_msg_verdict_hdr *vhdr; | |
677 | unsigned int verdict; | |
678 | ||
679 | if (!nfqa[NFQA_VERDICT_HDR]) | |
680 | return NULL; | |
681 | ||
682 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); | |
c6675233 FW |
683 | verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; |
684 | if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) | |
97d32cf9 FW |
685 | return NULL; |
686 | return vhdr; | |
687 | } | |
688 | ||
689 | static int nfq_id_after(unsigned int id, unsigned int max) | |
690 | { | |
691 | return (int)(id - max) > 0; | |
692 | } | |
693 | ||
694 | static int | |
695 | nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb, | |
696 | const struct nlmsghdr *nlh, | |
697 | const struct nlattr * const nfqa[]) | |
698 | { | |
3da07c0c | 699 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
97d32cf9 FW |
700 | struct nf_queue_entry *entry, *tmp; |
701 | unsigned int verdict, maxid; | |
702 | struct nfqnl_msg_verdict_hdr *vhdr; | |
703 | struct nfqnl_instance *queue; | |
704 | LIST_HEAD(batch_list); | |
705 | u16 queue_num = ntohs(nfmsg->res_id); | |
706 | ||
15e47304 | 707 | queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).portid); |
97d32cf9 FW |
708 | if (IS_ERR(queue)) |
709 | return PTR_ERR(queue); | |
710 | ||
711 | vhdr = verdicthdr_get(nfqa); | |
712 | if (!vhdr) | |
713 | return -EINVAL; | |
714 | ||
715 | verdict = ntohl(vhdr->verdict); | |
716 | maxid = ntohl(vhdr->id); | |
717 | ||
718 | spin_lock_bh(&queue->lock); | |
719 | ||
720 | list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { | |
721 | if (nfq_id_after(entry->id, maxid)) | |
722 | break; | |
723 | __dequeue_entry(queue, entry); | |
724 | list_add_tail(&entry->list, &batch_list); | |
725 | } | |
726 | ||
727 | spin_unlock_bh(&queue->lock); | |
728 | ||
729 | if (list_empty(&batch_list)) | |
730 | return -ENOENT; | |
731 | ||
732 | list_for_each_entry_safe(entry, tmp, &batch_list, list) { | |
733 | if (nfqa[NFQA_MARK]) | |
734 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); | |
735 | nf_reinject(entry, verdict); | |
736 | } | |
737 | return 0; | |
738 | } | |
739 | ||
7af4cc3f HW |
740 | static int |
741 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
742 | const struct nlmsghdr *nlh, |
743 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 744 | { |
3da07c0c | 745 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
746 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
747 | ||
748 | struct nfqnl_msg_verdict_hdr *vhdr; | |
749 | struct nfqnl_instance *queue; | |
750 | unsigned int verdict; | |
02f014d8 | 751 | struct nf_queue_entry *entry; |
8c88f87c PNA |
752 | enum ip_conntrack_info uninitialized_var(ctinfo); |
753 | struct nf_conn *ct = NULL; | |
7af4cc3f | 754 | |
9872bec7 | 755 | queue = instance_lookup(queue_num); |
84a797dd | 756 | if (!queue) |
7af4cc3f | 757 | |
15e47304 | 758 | queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).portid); |
97d32cf9 FW |
759 | if (IS_ERR(queue)) |
760 | return PTR_ERR(queue); | |
7af4cc3f | 761 | |
97d32cf9 FW |
762 | vhdr = verdicthdr_get(nfqa); |
763 | if (!vhdr) | |
84a797dd | 764 | return -EINVAL; |
7af4cc3f | 765 | |
7af4cc3f HW |
766 | verdict = ntohl(vhdr->verdict); |
767 | ||
b43d8d85 | 768 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
84a797dd ED |
769 | if (entry == NULL) |
770 | return -ENOENT; | |
7af4cc3f | 771 | |
9cb01766 | 772 | rcu_read_lock(); |
7c622345 PNA |
773 | if (nfqa[NFQA_CT] && (queue->flags & NFQA_CFG_F_CONNTRACK)) |
774 | ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo); | |
9cb01766 | 775 | |
df6fb868 | 776 | if (nfqa[NFQA_PAYLOAD]) { |
8c88f87c PNA |
777 | u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); |
778 | int diff = payload_len - entry->skb->len; | |
779 | ||
df6fb868 | 780 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), |
8c88f87c | 781 | payload_len, entry, diff) < 0) |
7af4cc3f | 782 | verdict = NF_DROP; |
8c88f87c | 783 | |
7c622345 PNA |
784 | if (ct) |
785 | nfqnl_ct_seq_adjust(skb, ct, ctinfo, diff); | |
7af4cc3f | 786 | } |
8c88f87c | 787 | rcu_read_unlock(); |
7af4cc3f | 788 | |
df6fb868 | 789 | if (nfqa[NFQA_MARK]) |
ea3a66ff | 790 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
601e68e1 | 791 | |
4b3d15ef | 792 | nf_reinject(entry, verdict); |
7af4cc3f HW |
793 | return 0; |
794 | } | |
795 | ||
796 | static int | |
797 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
798 | const struct nlmsghdr *nlh, |
799 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
800 | { |
801 | return -ENOTSUPP; | |
802 | } | |
803 | ||
5bf75853 PM |
804 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
805 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
806 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
838ab636 HW |
807 | }; |
808 | ||
e3ac5298 | 809 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
810 | .outfn = &nfqnl_enqueue_packet, |
811 | }; | |
812 | ||
7af4cc3f HW |
813 | static int |
814 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
815 | const struct nlmsghdr *nlh, |
816 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 817 | { |
3da07c0c | 818 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
819 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
820 | struct nfqnl_instance *queue; | |
9872bec7 | 821 | struct nfqnl_msg_config_cmd *cmd = NULL; |
838ab636 | 822 | int ret = 0; |
7af4cc3f | 823 | |
9872bec7 PM |
824 | if (nfqa[NFQA_CFG_CMD]) { |
825 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); | |
826 | ||
0360ae41 | 827 | /* Obsolete commands without queue context */ |
9872bec7 | 828 | switch (cmd->command) { |
0360ae41 FW |
829 | case NFQNL_CFG_CMD_PF_BIND: return 0; |
830 | case NFQNL_CFG_CMD_PF_UNBIND: return 0; | |
9872bec7 | 831 | } |
9872bec7 PM |
832 | } |
833 | ||
834 | rcu_read_lock(); | |
835 | queue = instance_lookup(queue_num); | |
15e47304 | 836 | if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { |
a3c8e7fd | 837 | ret = -EPERM; |
9872bec7 | 838 | goto err_out_unlock; |
a3c8e7fd PM |
839 | } |
840 | ||
9872bec7 | 841 | if (cmd != NULL) { |
7af4cc3f HW |
842 | switch (cmd->command) { |
843 | case NFQNL_CFG_CMD_BIND: | |
9872bec7 PM |
844 | if (queue) { |
845 | ret = -EBUSY; | |
846 | goto err_out_unlock; | |
847 | } | |
15e47304 | 848 | queue = instance_create(queue_num, NETLINK_CB(skb).portid); |
baab2ce7 PM |
849 | if (IS_ERR(queue)) { |
850 | ret = PTR_ERR(queue); | |
9872bec7 PM |
851 | goto err_out_unlock; |
852 | } | |
7af4cc3f HW |
853 | break; |
854 | case NFQNL_CFG_CMD_UNBIND: | |
9872bec7 PM |
855 | if (!queue) { |
856 | ret = -ENODEV; | |
857 | goto err_out_unlock; | |
858 | } | |
7af4cc3f HW |
859 | instance_destroy(queue); |
860 | break; | |
861 | case NFQNL_CFG_CMD_PF_BIND: | |
7af4cc3f | 862 | case NFQNL_CFG_CMD_PF_UNBIND: |
7af4cc3f HW |
863 | break; |
864 | default: | |
cd21f0ac | 865 | ret = -ENOTSUPP; |
838ab636 | 866 | break; |
7af4cc3f | 867 | } |
7af4cc3f HW |
868 | } |
869 | ||
df6fb868 | 870 | if (nfqa[NFQA_CFG_PARAMS]) { |
7af4cc3f | 871 | struct nfqnl_msg_config_params *params; |
7af4cc3f | 872 | |
406dbfc9 | 873 | if (!queue) { |
a3c8e7fd | 874 | ret = -ENODEV; |
9872bec7 | 875 | goto err_out_unlock; |
406dbfc9 | 876 | } |
df6fb868 | 877 | params = nla_data(nfqa[NFQA_CFG_PARAMS]); |
7af4cc3f HW |
878 | nfqnl_set_mode(queue, params->copy_mode, |
879 | ntohl(params->copy_range)); | |
880 | } | |
881 | ||
df6fb868 | 882 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
829e17a1 | 883 | __be32 *queue_maxlen; |
a3c8e7fd PM |
884 | |
885 | if (!queue) { | |
886 | ret = -ENODEV; | |
9872bec7 | 887 | goto err_out_unlock; |
a3c8e7fd | 888 | } |
df6fb868 | 889 | queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
829e17a1 EL |
890 | spin_lock_bh(&queue->lock); |
891 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
892 | spin_unlock_bh(&queue->lock); | |
893 | } | |
894 | ||
fdb694a0 KK |
895 | if (nfqa[NFQA_CFG_FLAGS]) { |
896 | __u32 flags, mask; | |
897 | ||
898 | if (!queue) { | |
899 | ret = -ENODEV; | |
900 | goto err_out_unlock; | |
901 | } | |
902 | ||
903 | if (!nfqa[NFQA_CFG_MASK]) { | |
904 | /* A mask is needed to specify which flags are being | |
905 | * changed. | |
906 | */ | |
907 | ret = -EINVAL; | |
908 | goto err_out_unlock; | |
909 | } | |
910 | ||
911 | flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); | |
912 | mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); | |
913 | ||
46ba5a25 KK |
914 | if (flags >= NFQA_CFG_F_MAX) { |
915 | ret = -EOPNOTSUPP; | |
916 | goto err_out_unlock; | |
917 | } | |
918 | ||
fdb694a0 KK |
919 | spin_lock_bh(&queue->lock); |
920 | queue->flags &= ~mask; | |
921 | queue->flags |= flags & mask; | |
922 | spin_unlock_bh(&queue->lock); | |
923 | } | |
924 | ||
9872bec7 PM |
925 | err_out_unlock: |
926 | rcu_read_unlock(); | |
838ab636 | 927 | return ret; |
7af4cc3f HW |
928 | } |
929 | ||
7c8d4cb4 | 930 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
84a797dd | 931 | [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, |
37d2e7a2 | 932 | .attr_count = NFQA_MAX, }, |
84a797dd | 933 | [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, |
5bf75853 PM |
934 | .attr_count = NFQA_MAX, |
935 | .policy = nfqa_verdict_policy }, | |
7af4cc3f | 936 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
5bf75853 PM |
937 | .attr_count = NFQA_CFG_MAX, |
938 | .policy = nfqa_cfg_policy }, | |
97d32cf9 FW |
939 | [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, |
940 | .attr_count = NFQA_MAX, | |
941 | .policy = nfqa_verdict_batch_policy }, | |
7af4cc3f HW |
942 | }; |
943 | ||
7c8d4cb4 | 944 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
945 | .name = "nf_queue", |
946 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
947 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
948 | .cb = nfqnl_cb, |
949 | }; | |
950 | ||
838ab636 HW |
951 | #ifdef CONFIG_PROC_FS |
952 | struct iter_state { | |
953 | unsigned int bucket; | |
954 | }; | |
955 | ||
956 | static struct hlist_node *get_first(struct seq_file *seq) | |
957 | { | |
958 | struct iter_state *st = seq->private; | |
959 | ||
960 | if (!st) | |
961 | return NULL; | |
962 | ||
963 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
964 | if (!hlist_empty(&instance_table[st->bucket])) | |
965 | return instance_table[st->bucket].first; | |
966 | } | |
967 | return NULL; | |
968 | } | |
969 | ||
970 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
971 | { | |
972 | struct iter_state *st = seq->private; | |
973 | ||
974 | h = h->next; | |
975 | while (!h) { | |
976 | if (++st->bucket >= INSTANCE_BUCKETS) | |
977 | return NULL; | |
978 | ||
979 | h = instance_table[st->bucket].first; | |
980 | } | |
981 | return h; | |
982 | } | |
983 | ||
984 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
985 | { | |
986 | struct hlist_node *head; | |
987 | head = get_first(seq); | |
988 | ||
989 | if (head) | |
990 | while (pos && (head = get_next(seq, head))) | |
991 | pos--; | |
992 | return pos ? NULL : head; | |
993 | } | |
994 | ||
995 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
ca7c48ca | 996 | __acquires(instances_lock) |
838ab636 | 997 | { |
9872bec7 | 998 | spin_lock(&instances_lock); |
838ab636 HW |
999 | return get_idx(seq, *pos); |
1000 | } | |
1001 | ||
1002 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1003 | { | |
1004 | (*pos)++; | |
1005 | return get_next(s, v); | |
1006 | } | |
1007 | ||
1008 | static void seq_stop(struct seq_file *s, void *v) | |
ca7c48ca | 1009 | __releases(instances_lock) |
838ab636 | 1010 | { |
9872bec7 | 1011 | spin_unlock(&instances_lock); |
838ab636 HW |
1012 | } |
1013 | ||
1014 | static int seq_show(struct seq_file *s, void *v) | |
1015 | { | |
1016 | const struct nfqnl_instance *inst = v; | |
1017 | ||
1018 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", | |
1019 | inst->queue_num, | |
15e47304 | 1020 | inst->peer_portid, inst->queue_total, |
838ab636 HW |
1021 | inst->copy_mode, inst->copy_range, |
1022 | inst->queue_dropped, inst->queue_user_dropped, | |
5863702a | 1023 | inst->id_sequence, 1); |
838ab636 HW |
1024 | } |
1025 | ||
56b3d975 | 1026 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
1027 | .start = seq_start, |
1028 | .next = seq_next, | |
1029 | .stop = seq_stop, | |
1030 | .show = seq_show, | |
1031 | }; | |
1032 | ||
1033 | static int nfqnl_open(struct inode *inode, struct file *file) | |
1034 | { | |
e2da5913 PE |
1035 | return seq_open_private(file, &nfqnl_seq_ops, |
1036 | sizeof(struct iter_state)); | |
838ab636 HW |
1037 | } |
1038 | ||
da7071d7 | 1039 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
1040 | .owner = THIS_MODULE, |
1041 | .open = nfqnl_open, | |
1042 | .read = seq_read, | |
1043 | .llseek = seq_lseek, | |
1044 | .release = seq_release_private, | |
1045 | }; | |
1046 | ||
1047 | #endif /* PROC_FS */ | |
1048 | ||
32292a7f | 1049 | static int __init nfnetlink_queue_init(void) |
7af4cc3f | 1050 | { |
838ab636 | 1051 | int i, status = -ENOMEM; |
601e68e1 | 1052 | |
838ab636 HW |
1053 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
1054 | INIT_HLIST_HEAD(&instance_table[i]); | |
1055 | ||
7af4cc3f HW |
1056 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1057 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1058 | if (status < 0) { | |
1059 | printk(KERN_ERR "nf_queue: failed to create netlink socket\n"); | |
1060 | goto cleanup_netlink_notifier; | |
1061 | } | |
1062 | ||
838ab636 | 1063 | #ifdef CONFIG_PROC_FS |
8eeee8b1 DL |
1064 | if (!proc_create("nfnetlink_queue", 0440, |
1065 | proc_net_netfilter, &nfqnl_file_ops)) | |
838ab636 | 1066 | goto cleanup_subsys; |
838ab636 HW |
1067 | #endif |
1068 | ||
7af4cc3f | 1069 | register_netdevice_notifier(&nfqnl_dev_notifier); |
0360ae41 | 1070 | nf_register_queue_handler(&nfqh); |
7af4cc3f HW |
1071 | return status; |
1072 | ||
838ab636 HW |
1073 | #ifdef CONFIG_PROC_FS |
1074 | cleanup_subsys: | |
7af4cc3f | 1075 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
32292a7f | 1076 | #endif |
7af4cc3f HW |
1077 | cleanup_netlink_notifier: |
1078 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
1079 | return status; | |
1080 | } | |
1081 | ||
65b4b4e8 | 1082 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1083 | { |
0360ae41 | 1084 | nf_unregister_queue_handler(); |
32292a7f PM |
1085 | unregister_netdevice_notifier(&nfqnl_dev_notifier); |
1086 | #ifdef CONFIG_PROC_FS | |
1087 | remove_proc_entry("nfnetlink_queue", proc_net_netfilter); | |
1088 | #endif | |
1089 | nfnetlink_subsys_unregister(&nfqnl_subsys); | |
1090 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
67137f3c JDB |
1091 | |
1092 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
7af4cc3f HW |
1093 | } |
1094 | ||
1095 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1096 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1097 | MODULE_LICENSE("GPL"); | |
1098 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1099 | ||
65b4b4e8 AM |
1100 | module_init(nfnetlink_queue_init); |
1101 | module_exit(nfnetlink_queue_fini); |