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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 | { | |
76 | return ((queue_num >> 8) | queue_num) % INSTANCE_BUCKETS; | |
77 | } | |
78 | ||
79 | static struct nfqnl_instance * | |
9872bec7 | 80 | instance_lookup(u_int16_t queue_num) |
7af4cc3f HW |
81 | { |
82 | struct hlist_head *head; | |
83 | struct hlist_node *pos; | |
84 | struct nfqnl_instance *inst; | |
85 | ||
86 | head = &instance_table[instance_hashfn(queue_num)]; | |
9872bec7 | 87 | hlist_for_each_entry_rcu(inst, pos, head, hlist) { |
7af4cc3f HW |
88 | if (inst->queue_num == queue_num) |
89 | return inst; | |
90 | } | |
91 | return NULL; | |
92 | } | |
93 | ||
7af4cc3f | 94 | static struct nfqnl_instance * |
15e47304 | 95 | instance_create(u_int16_t queue_num, int portid) |
7af4cc3f | 96 | { |
baab2ce7 | 97 | struct nfqnl_instance *inst; |
9872bec7 | 98 | unsigned int h; |
baab2ce7 | 99 | int err; |
7af4cc3f | 100 | |
9872bec7 | 101 | spin_lock(&instances_lock); |
baab2ce7 PM |
102 | if (instance_lookup(queue_num)) { |
103 | err = -EEXIST; | |
7af4cc3f | 104 | goto out_unlock; |
baab2ce7 | 105 | } |
7af4cc3f | 106 | |
10dfdc69 | 107 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
108 | if (!inst) { |
109 | err = -ENOMEM; | |
7af4cc3f | 110 | goto out_unlock; |
baab2ce7 | 111 | } |
7af4cc3f | 112 | |
7af4cc3f | 113 | inst->queue_num = queue_num; |
15e47304 | 114 | inst->peer_portid = portid; |
7af4cc3f HW |
115 | inst->queue_maxlen = NFQNL_QMAX_DEFAULT; |
116 | inst->copy_range = 0xfffff; | |
117 | inst->copy_mode = NFQNL_COPY_NONE; | |
181a46a5 | 118 | spin_lock_init(&inst->lock); |
7af4cc3f HW |
119 | INIT_LIST_HEAD(&inst->queue_list); |
120 | ||
baab2ce7 PM |
121 | if (!try_module_get(THIS_MODULE)) { |
122 | err = -EAGAIN; | |
7af4cc3f | 123 | goto out_free; |
baab2ce7 | 124 | } |
7af4cc3f | 125 | |
9872bec7 PM |
126 | h = instance_hashfn(queue_num); |
127 | hlist_add_head_rcu(&inst->hlist, &instance_table[h]); | |
7af4cc3f | 128 | |
9872bec7 | 129 | spin_unlock(&instances_lock); |
7af4cc3f | 130 | |
7af4cc3f HW |
131 | return inst; |
132 | ||
133 | out_free: | |
134 | kfree(inst); | |
135 | out_unlock: | |
9872bec7 | 136 | spin_unlock(&instances_lock); |
baab2ce7 | 137 | return ERR_PTR(err); |
7af4cc3f HW |
138 | } |
139 | ||
b43d8d85 PM |
140 | static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, |
141 | unsigned long data); | |
7af4cc3f HW |
142 | |
143 | static void | |
9872bec7 | 144 | instance_destroy_rcu(struct rcu_head *head) |
7af4cc3f | 145 | { |
9872bec7 PM |
146 | struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance, |
147 | rcu); | |
7af4cc3f | 148 | |
b43d8d85 | 149 | nfqnl_flush(inst, NULL, 0); |
9872bec7 | 150 | kfree(inst); |
7af4cc3f HW |
151 | module_put(THIS_MODULE); |
152 | } | |
153 | ||
9872bec7 | 154 | static void |
7af4cc3f HW |
155 | __instance_destroy(struct nfqnl_instance *inst) |
156 | { | |
9872bec7 PM |
157 | hlist_del_rcu(&inst->hlist); |
158 | call_rcu(&inst->rcu, instance_destroy_rcu); | |
7af4cc3f HW |
159 | } |
160 | ||
9872bec7 | 161 | static void |
7af4cc3f HW |
162 | instance_destroy(struct nfqnl_instance *inst) |
163 | { | |
9872bec7 PM |
164 | spin_lock(&instances_lock); |
165 | __instance_destroy(inst); | |
166 | spin_unlock(&instances_lock); | |
7af4cc3f HW |
167 | } |
168 | ||
7af4cc3f | 169 | static inline void |
02f014d8 | 170 | __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) |
7af4cc3f | 171 | { |
0ac41e81 | 172 | list_add_tail(&entry->list, &queue->queue_list); |
7af4cc3f HW |
173 | queue->queue_total++; |
174 | } | |
175 | ||
97d32cf9 FW |
176 | static void |
177 | __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) | |
178 | { | |
179 | list_del(&entry->list); | |
180 | queue->queue_total--; | |
181 | } | |
182 | ||
02f014d8 | 183 | static struct nf_queue_entry * |
b43d8d85 | 184 | find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id) |
7af4cc3f | 185 | { |
02f014d8 | 186 | struct nf_queue_entry *entry = NULL, *i; |
601e68e1 | 187 | |
7af4cc3f | 188 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
189 | |
190 | list_for_each_entry(i, &queue->queue_list, list) { | |
191 | if (i->id == id) { | |
192 | entry = i; | |
193 | break; | |
194 | } | |
195 | } | |
196 | ||
97d32cf9 FW |
197 | if (entry) |
198 | __dequeue_entry(queue, entry); | |
b43d8d85 | 199 | |
7af4cc3f HW |
200 | spin_unlock_bh(&queue->lock); |
201 | ||
202 | return entry; | |
203 | } | |
204 | ||
205 | static void | |
b43d8d85 | 206 | nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) |
7af4cc3f | 207 | { |
02f014d8 | 208 | struct nf_queue_entry *entry, *next; |
b43d8d85 | 209 | |
7af4cc3f | 210 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
211 | list_for_each_entry_safe(entry, next, &queue->queue_list, list) { |
212 | if (!cmpfn || cmpfn(entry, data)) { | |
213 | list_del(&entry->list); | |
214 | queue->queue_total--; | |
4b3d15ef | 215 | nf_reinject(entry, NF_DROP); |
b43d8d85 PM |
216 | } |
217 | } | |
7af4cc3f HW |
218 | spin_unlock_bh(&queue->lock); |
219 | } | |
220 | ||
221 | static struct sk_buff * | |
222 | nfqnl_build_packet_message(struct nfqnl_instance *queue, | |
5863702a ED |
223 | struct nf_queue_entry *entry, |
224 | __be32 **packet_id_ptr) | |
7af4cc3f | 225 | { |
27a884dc | 226 | sk_buff_data_t old_tail; |
7af4cc3f | 227 | size_t size; |
6ee584be | 228 | size_t data_len = 0, cap_len = 0; |
7af4cc3f | 229 | struct sk_buff *skb; |
5863702a ED |
230 | struct nlattr *nla; |
231 | struct nfqnl_msg_packet_hdr *pmsg; | |
7af4cc3f HW |
232 | struct nlmsghdr *nlh; |
233 | struct nfgenmsg *nfmsg; | |
3e4ead4f JJ |
234 | struct sk_buff *entskb = entry->skb; |
235 | struct net_device *indev; | |
236 | struct net_device *outdev; | |
9cb01766 PNA |
237 | struct nf_conn *ct = NULL; |
238 | enum ip_conntrack_info uninitialized_var(ctinfo); | |
7af4cc3f | 239 | |
cabaa9bf | 240 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) |
df6fb868 PM |
241 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) |
242 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
243 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 244 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
245 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
246 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 247 | #endif |
df6fb868 PM |
248 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
249 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) | |
6ee584be PNA |
250 | + nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp) |
251 | + nla_total_size(sizeof(u_int32_t))); /* cap_len */ | |
7af4cc3f | 252 | |
02f014d8 | 253 | outdev = entry->outdev; |
3e4ead4f | 254 | |
c463ac97 | 255 | switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) { |
7af4cc3f HW |
256 | case NFQNL_COPY_META: |
257 | case NFQNL_COPY_NONE: | |
7af4cc3f | 258 | break; |
601e68e1 | 259 | |
7af4cc3f | 260 | case NFQNL_COPY_PACKET: |
e9f13cab | 261 | if (entskb->ip_summed == CHECKSUM_PARTIAL && |
c463ac97 | 262 | skb_checksum_help(entskb)) |
e7dfb09a | 263 | return NULL; |
c463ac97 ED |
264 | |
265 | data_len = ACCESS_ONCE(queue->copy_range); | |
266 | if (data_len == 0 || data_len > entskb->len) | |
3e4ead4f | 267 | data_len = entskb->len; |
601e68e1 | 268 | |
df6fb868 | 269 | size += nla_total_size(data_len); |
6ee584be | 270 | cap_len = entskb->len; |
7af4cc3f | 271 | break; |
7af4cc3f HW |
272 | } |
273 | ||
7c622345 PNA |
274 | if (queue->flags & NFQA_CFG_F_CONNTRACK) |
275 | ct = nfqnl_ct_get(entskb, &size, &ctinfo); | |
7af4cc3f HW |
276 | |
277 | skb = alloc_skb(size, GFP_ATOMIC); | |
278 | if (!skb) | |
3da07c0c | 279 | return NULL; |
601e68e1 | 280 | |
27a884dc | 281 | old_tail = skb->tail; |
3da07c0c | 282 | nlh = nlmsg_put(skb, 0, 0, |
7af4cc3f | 283 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, |
3da07c0c DM |
284 | sizeof(struct nfgenmsg), 0); |
285 | if (!nlh) { | |
286 | kfree_skb(skb); | |
287 | return NULL; | |
288 | } | |
289 | nfmsg = nlmsg_data(nlh); | |
02f014d8 | 290 | nfmsg->nfgen_family = entry->pf; |
7af4cc3f HW |
291 | nfmsg->version = NFNETLINK_V0; |
292 | nfmsg->res_id = htons(queue->queue_num); | |
293 | ||
5863702a ED |
294 | nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); |
295 | pmsg = nla_data(nla); | |
296 | pmsg->hw_protocol = entskb->protocol; | |
297 | pmsg->hook = entry->hook; | |
298 | *packet_id_ptr = &pmsg->packet_id; | |
7af4cc3f | 299 | |
02f014d8 | 300 | indev = entry->indev; |
3e4ead4f | 301 | if (indev) { |
fbcd923c | 302 | #ifndef CONFIG_BRIDGE_NETFILTER |
a447189e DM |
303 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) |
304 | goto nla_put_failure; | |
fbcd923c | 305 | #else |
02f014d8 | 306 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 307 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 308 | * look for bridge group (when called from |
fbcd923c | 309 | * netfilter_bridge) */ |
a447189e DM |
310 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
311 | htonl(indev->ifindex)) || | |
fbcd923c | 312 | /* this is the bridge group "brX" */ |
f350a0a8 | 313 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
314 | nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
315 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
316 | goto nla_put_failure; | |
fbcd923c HW |
317 | } else { |
318 | /* Case 2: indev is bridge group, we need to look for | |
319 | * physical device (when called from ipv4) */ | |
a447189e DM |
320 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
321 | htonl(indev->ifindex))) | |
322 | goto nla_put_failure; | |
323 | if (entskb->nf_bridge && entskb->nf_bridge->physindev && | |
324 | nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, | |
325 | htonl(entskb->nf_bridge->physindev->ifindex))) | |
326 | goto nla_put_failure; | |
fbcd923c HW |
327 | } |
328 | #endif | |
7af4cc3f HW |
329 | } |
330 | ||
3e4ead4f | 331 | if (outdev) { |
fbcd923c | 332 | #ifndef CONFIG_BRIDGE_NETFILTER |
a447189e DM |
333 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) |
334 | goto nla_put_failure; | |
fbcd923c | 335 | #else |
02f014d8 | 336 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 337 | /* Case 1: outdev is physical output device, we need to |
601e68e1 | 338 | * look for bridge group (when called from |
fbcd923c | 339 | * netfilter_bridge) */ |
a447189e DM |
340 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
341 | htonl(outdev->ifindex)) || | |
fbcd923c | 342 | /* this is the bridge group "brX" */ |
f350a0a8 | 343 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
344 | nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
345 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
346 | goto nla_put_failure; | |
fbcd923c HW |
347 | } else { |
348 | /* Case 2: outdev is bridge group, we need to look for | |
349 | * physical output device (when called from ipv4) */ | |
a447189e DM |
350 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
351 | htonl(outdev->ifindex))) | |
352 | goto nla_put_failure; | |
353 | if (entskb->nf_bridge && entskb->nf_bridge->physoutdev && | |
354 | nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, | |
355 | htonl(entskb->nf_bridge->physoutdev->ifindex))) | |
356 | goto nla_put_failure; | |
fbcd923c HW |
357 | } |
358 | #endif | |
7af4cc3f HW |
359 | } |
360 | ||
a447189e DM |
361 | if (entskb->mark && |
362 | nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) | |
363 | goto nla_put_failure; | |
7af4cc3f | 364 | |
2c38de4c NC |
365 | if (indev && entskb->dev && |
366 | entskb->mac_header != entskb->network_header) { | |
7af4cc3f | 367 | struct nfqnl_msg_packet_hw phw; |
b95cce35 SH |
368 | int len = dev_parse_header(entskb, phw.hw_addr); |
369 | if (len) { | |
370 | phw.hw_addrlen = htons(len); | |
a447189e DM |
371 | if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) |
372 | goto nla_put_failure; | |
b95cce35 | 373 | } |
7af4cc3f HW |
374 | } |
375 | ||
b7aa0bf7 | 376 | if (entskb->tstamp.tv64) { |
7af4cc3f | 377 | struct nfqnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
378 | struct timeval tv = ktime_to_timeval(entskb->tstamp); |
379 | ts.sec = cpu_to_be64(tv.tv_sec); | |
380 | ts.usec = cpu_to_be64(tv.tv_usec); | |
7af4cc3f | 381 | |
a447189e DM |
382 | if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) |
383 | goto nla_put_failure; | |
7af4cc3f HW |
384 | } |
385 | ||
386 | if (data_len) { | |
df6fb868 | 387 | struct nlattr *nla; |
ca7c48ca | 388 | int sz = nla_attr_size(data_len); |
7af4cc3f | 389 | |
df6fb868 | 390 | if (skb_tailroom(skb) < nla_total_size(data_len)) { |
7af4cc3f | 391 | printk(KERN_WARNING "nf_queue: no tailroom!\n"); |
3da07c0c DM |
392 | kfree_skb(skb); |
393 | return NULL; | |
7af4cc3f HW |
394 | } |
395 | ||
df6fb868 PM |
396 | nla = (struct nlattr *)skb_put(skb, nla_total_size(data_len)); |
397 | nla->nla_type = NFQA_PAYLOAD; | |
ca7c48ca | 398 | nla->nla_len = sz; |
7af4cc3f | 399 | |
df6fb868 | 400 | if (skb_copy_bits(entskb, 0, nla_data(nla), data_len)) |
7af4cc3f HW |
401 | BUG(); |
402 | } | |
601e68e1 | 403 | |
7c622345 PNA |
404 | if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0) |
405 | goto nla_put_failure; | |
9cb01766 | 406 | |
6ee584be PNA |
407 | if (cap_len > 0 && nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) |
408 | goto nla_put_failure; | |
409 | ||
7af4cc3f HW |
410 | nlh->nlmsg_len = skb->tail - old_tail; |
411 | return skb; | |
412 | ||
df6fb868 | 413 | nla_put_failure: |
a6729955 | 414 | kfree_skb(skb); |
e87cc472 | 415 | net_err_ratelimited("nf_queue: error creating packet message\n"); |
7af4cc3f HW |
416 | return NULL; |
417 | } | |
418 | ||
419 | static int | |
02f014d8 | 420 | nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) |
7af4cc3f | 421 | { |
7af4cc3f HW |
422 | struct sk_buff *nskb; |
423 | struct nfqnl_instance *queue; | |
f1585086 | 424 | int err = -ENOBUFS; |
5863702a | 425 | __be32 *packet_id_ptr; |
fdb694a0 | 426 | int failopen = 0; |
7af4cc3f | 427 | |
9872bec7 PM |
428 | /* rcu_read_lock()ed by nf_hook_slow() */ |
429 | queue = instance_lookup(queuenum); | |
f1585086 FW |
430 | if (!queue) { |
431 | err = -ESRCH; | |
0ef0f465 | 432 | goto err_out; |
f1585086 | 433 | } |
7af4cc3f | 434 | |
f1585086 FW |
435 | if (queue->copy_mode == NFQNL_COPY_NONE) { |
436 | err = -EINVAL; | |
0ef0f465 | 437 | goto err_out; |
f1585086 | 438 | } |
7af4cc3f | 439 | |
5863702a | 440 | nskb = nfqnl_build_packet_message(queue, entry, &packet_id_ptr); |
f1585086 FW |
441 | if (nskb == NULL) { |
442 | err = -ENOMEM; | |
0ef0f465 | 443 | goto err_out; |
f1585086 | 444 | } |
7af4cc3f | 445 | spin_lock_bh(&queue->lock); |
601e68e1 | 446 | |
15e47304 | 447 | if (!queue->peer_portid) { |
f1585086 | 448 | err = -EINVAL; |
601e68e1 | 449 | goto err_out_free_nskb; |
f1585086 | 450 | } |
7af4cc3f | 451 | if (queue->queue_total >= queue->queue_maxlen) { |
fdb694a0 KK |
452 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
453 | failopen = 1; | |
454 | err = 0; | |
455 | } else { | |
456 | queue->queue_dropped++; | |
457 | net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", | |
458 | queue->queue_total); | |
459 | } | |
7af4cc3f HW |
460 | goto err_out_free_nskb; |
461 | } | |
5863702a ED |
462 | entry->id = ++queue->id_sequence; |
463 | *packet_id_ptr = htonl(entry->id); | |
7af4cc3f HW |
464 | |
465 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
15e47304 | 466 | err = nfnetlink_unicast(nskb, &init_net, queue->peer_portid, MSG_DONTWAIT); |
0ef0f465 | 467 | if (err < 0) { |
601e68e1 | 468 | queue->queue_user_dropped++; |
7af4cc3f HW |
469 | goto err_out_unlock; |
470 | } | |
471 | ||
472 | __enqueue_entry(queue, entry); | |
473 | ||
474 | spin_unlock_bh(&queue->lock); | |
0ef0f465 | 475 | return 0; |
7af4cc3f HW |
476 | |
477 | err_out_free_nskb: | |
601e68e1 | 478 | kfree_skb(nskb); |
7af4cc3f HW |
479 | err_out_unlock: |
480 | spin_unlock_bh(&queue->lock); | |
fdb694a0 KK |
481 | if (failopen) |
482 | nf_reinject(entry, NF_ACCEPT); | |
0ef0f465 | 483 | err_out: |
f1585086 | 484 | return err; |
7af4cc3f HW |
485 | } |
486 | ||
487 | static int | |
8c88f87c | 488 | nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) |
7af4cc3f | 489 | { |
e2b58a67 | 490 | struct sk_buff *nskb; |
7af4cc3f | 491 | |
d8a585d7 PM |
492 | if (diff < 0) { |
493 | if (pskb_trim(e->skb, data_len)) | |
494 | return -ENOMEM; | |
495 | } else if (diff > 0) { | |
7af4cc3f HW |
496 | if (data_len > 0xFFFF) |
497 | return -EINVAL; | |
498 | if (diff > skb_tailroom(e->skb)) { | |
9a732ed6 AE |
499 | nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), |
500 | diff, GFP_ATOMIC); | |
e2b58a67 | 501 | if (!nskb) { |
1158ba27 | 502 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f | 503 | "in mangle, dropping packet\n"); |
e2b58a67 | 504 | return -ENOMEM; |
7af4cc3f | 505 | } |
e2b58a67 PM |
506 | kfree_skb(e->skb); |
507 | e->skb = nskb; | |
7af4cc3f HW |
508 | } |
509 | skb_put(e->skb, diff); | |
510 | } | |
37d41879 | 511 | if (!skb_make_writable(e->skb, data_len)) |
7af4cc3f | 512 | return -ENOMEM; |
27d7ff46 | 513 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 514 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
515 | return 0; |
516 | } | |
517 | ||
7af4cc3f HW |
518 | static int |
519 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
520 | unsigned char mode, unsigned int range) | |
521 | { | |
c5de0dfd | 522 | int status = 0; |
7af4cc3f HW |
523 | |
524 | spin_lock_bh(&queue->lock); | |
c5de0dfd PM |
525 | switch (mode) { |
526 | case NFQNL_COPY_NONE: | |
527 | case NFQNL_COPY_META: | |
528 | queue->copy_mode = mode; | |
529 | queue->copy_range = 0; | |
530 | break; | |
531 | ||
532 | case NFQNL_COPY_PACKET: | |
533 | queue->copy_mode = mode; | |
ba8d3b0b PNA |
534 | /* We're using struct nlattr which has 16bit nla_len. Note that |
535 | * nla_len includes the header length. Thus, the maximum packet | |
536 | * length that we support is 65531 bytes. We send truncated | |
537 | * packets if the specified length is larger than that. | |
538 | */ | |
539 | if (range > 0xffff - NLA_HDRLEN) | |
540 | queue->copy_range = 0xffff - NLA_HDRLEN; | |
c5de0dfd PM |
541 | else |
542 | queue->copy_range = range; | |
543 | break; | |
544 | ||
545 | default: | |
546 | status = -EINVAL; | |
547 | ||
548 | } | |
7af4cc3f HW |
549 | spin_unlock_bh(&queue->lock); |
550 | ||
551 | return status; | |
552 | } | |
553 | ||
554 | static int | |
02f014d8 | 555 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
7af4cc3f | 556 | { |
02f014d8 PM |
557 | if (entry->indev) |
558 | if (entry->indev->ifindex == ifindex) | |
7af4cc3f | 559 | return 1; |
02f014d8 PM |
560 | if (entry->outdev) |
561 | if (entry->outdev->ifindex == ifindex) | |
7af4cc3f | 562 | return 1; |
ef47c6a7 PM |
563 | #ifdef CONFIG_BRIDGE_NETFILTER |
564 | if (entry->skb->nf_bridge) { | |
565 | if (entry->skb->nf_bridge->physindev && | |
566 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
567 | return 1; | |
568 | if (entry->skb->nf_bridge->physoutdev && | |
569 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
570 | return 1; | |
571 | } | |
572 | #endif | |
7af4cc3f HW |
573 | return 0; |
574 | } | |
575 | ||
576 | /* drop all packets with either indev or outdev == ifindex from all queue | |
577 | * instances */ | |
578 | static void | |
579 | nfqnl_dev_drop(int ifindex) | |
580 | { | |
581 | int i; | |
601e68e1 | 582 | |
9872bec7 | 583 | rcu_read_lock(); |
7af4cc3f | 584 | |
9872bec7 | 585 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
7af4cc3f HW |
586 | struct hlist_node *tmp; |
587 | struct nfqnl_instance *inst; | |
588 | struct hlist_head *head = &instance_table[i]; | |
589 | ||
9872bec7 | 590 | hlist_for_each_entry_rcu(inst, tmp, head, hlist) |
b43d8d85 | 591 | nfqnl_flush(inst, dev_cmp, ifindex); |
7af4cc3f HW |
592 | } |
593 | ||
9872bec7 | 594 | rcu_read_unlock(); |
7af4cc3f HW |
595 | } |
596 | ||
597 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
598 | ||
599 | static int | |
600 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
601 | unsigned long event, void *ptr) | |
602 | { | |
603 | struct net_device *dev = ptr; | |
604 | ||
721499e8 | 605 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
606 | return NOTIFY_DONE; |
607 | ||
7af4cc3f HW |
608 | /* Drop any packets associated with the downed device */ |
609 | if (event == NETDEV_DOWN) | |
610 | nfqnl_dev_drop(dev->ifindex); | |
611 | return NOTIFY_DONE; | |
612 | } | |
613 | ||
614 | static struct notifier_block nfqnl_dev_notifier = { | |
615 | .notifier_call = nfqnl_rcv_dev_event, | |
616 | }; | |
617 | ||
618 | static int | |
619 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
620 | unsigned long event, void *ptr) | |
621 | { | |
622 | struct netlink_notify *n = ptr; | |
623 | ||
dee5817e | 624 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
7af4cc3f HW |
625 | int i; |
626 | ||
15e47304 | 627 | /* destroy all instances for this portid */ |
9872bec7 PM |
628 | spin_lock(&instances_lock); |
629 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
7af4cc3f HW |
630 | struct hlist_node *tmp, *t2; |
631 | struct nfqnl_instance *inst; | |
632 | struct hlist_head *head = &instance_table[i]; | |
633 | ||
634 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
b4b51029 | 635 | if ((n->net == &init_net) && |
15e47304 | 636 | (n->portid == inst->peer_portid)) |
7af4cc3f HW |
637 | __instance_destroy(inst); |
638 | } | |
639 | } | |
9872bec7 | 640 | spin_unlock(&instances_lock); |
7af4cc3f HW |
641 | } |
642 | return NOTIFY_DONE; | |
643 | } | |
644 | ||
645 | static struct notifier_block nfqnl_rtnl_notifier = { | |
646 | .notifier_call = nfqnl_rcv_nl_event, | |
647 | }; | |
648 | ||
5bf75853 PM |
649 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
650 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
651 | [NFQA_MARK] = { .type = NLA_U32 }, | |
652 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
9cb01766 | 653 | [NFQA_CT] = { .type = NLA_UNSPEC }, |
838ab636 HW |
654 | }; |
655 | ||
97d32cf9 FW |
656 | static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { |
657 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
658 | [NFQA_MARK] = { .type = NLA_U32 }, | |
659 | }; | |
660 | ||
15e47304 | 661 | static struct nfqnl_instance *verdict_instance_lookup(u16 queue_num, int nlportid) |
97d32cf9 FW |
662 | { |
663 | struct nfqnl_instance *queue; | |
664 | ||
665 | queue = instance_lookup(queue_num); | |
666 | if (!queue) | |
667 | return ERR_PTR(-ENODEV); | |
668 | ||
15e47304 | 669 | if (queue->peer_portid != nlportid) |
97d32cf9 FW |
670 | return ERR_PTR(-EPERM); |
671 | ||
672 | return queue; | |
673 | } | |
674 | ||
675 | static struct nfqnl_msg_verdict_hdr* | |
676 | verdicthdr_get(const struct nlattr * const nfqa[]) | |
677 | { | |
678 | struct nfqnl_msg_verdict_hdr *vhdr; | |
679 | unsigned int verdict; | |
680 | ||
681 | if (!nfqa[NFQA_VERDICT_HDR]) | |
682 | return NULL; | |
683 | ||
684 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); | |
c6675233 FW |
685 | verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; |
686 | if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) | |
97d32cf9 FW |
687 | return NULL; |
688 | return vhdr; | |
689 | } | |
690 | ||
691 | static int nfq_id_after(unsigned int id, unsigned int max) | |
692 | { | |
693 | return (int)(id - max) > 0; | |
694 | } | |
695 | ||
696 | static int | |
697 | nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb, | |
698 | const struct nlmsghdr *nlh, | |
699 | const struct nlattr * const nfqa[]) | |
700 | { | |
3da07c0c | 701 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
97d32cf9 FW |
702 | struct nf_queue_entry *entry, *tmp; |
703 | unsigned int verdict, maxid; | |
704 | struct nfqnl_msg_verdict_hdr *vhdr; | |
705 | struct nfqnl_instance *queue; | |
706 | LIST_HEAD(batch_list); | |
707 | u16 queue_num = ntohs(nfmsg->res_id); | |
708 | ||
15e47304 | 709 | queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).portid); |
97d32cf9 FW |
710 | if (IS_ERR(queue)) |
711 | return PTR_ERR(queue); | |
712 | ||
713 | vhdr = verdicthdr_get(nfqa); | |
714 | if (!vhdr) | |
715 | return -EINVAL; | |
716 | ||
717 | verdict = ntohl(vhdr->verdict); | |
718 | maxid = ntohl(vhdr->id); | |
719 | ||
720 | spin_lock_bh(&queue->lock); | |
721 | ||
722 | list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { | |
723 | if (nfq_id_after(entry->id, maxid)) | |
724 | break; | |
725 | __dequeue_entry(queue, entry); | |
726 | list_add_tail(&entry->list, &batch_list); | |
727 | } | |
728 | ||
729 | spin_unlock_bh(&queue->lock); | |
730 | ||
731 | if (list_empty(&batch_list)) | |
732 | return -ENOENT; | |
733 | ||
734 | list_for_each_entry_safe(entry, tmp, &batch_list, list) { | |
735 | if (nfqa[NFQA_MARK]) | |
736 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); | |
737 | nf_reinject(entry, verdict); | |
738 | } | |
739 | return 0; | |
740 | } | |
741 | ||
7af4cc3f HW |
742 | static int |
743 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
744 | const struct nlmsghdr *nlh, |
745 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 746 | { |
3da07c0c | 747 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
748 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
749 | ||
750 | struct nfqnl_msg_verdict_hdr *vhdr; | |
751 | struct nfqnl_instance *queue; | |
752 | unsigned int verdict; | |
02f014d8 | 753 | struct nf_queue_entry *entry; |
8c88f87c PNA |
754 | enum ip_conntrack_info uninitialized_var(ctinfo); |
755 | struct nf_conn *ct = NULL; | |
7af4cc3f | 756 | |
9872bec7 | 757 | queue = instance_lookup(queue_num); |
84a797dd | 758 | if (!queue) |
7af4cc3f | 759 | |
15e47304 | 760 | queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).portid); |
97d32cf9 FW |
761 | if (IS_ERR(queue)) |
762 | return PTR_ERR(queue); | |
7af4cc3f | 763 | |
97d32cf9 FW |
764 | vhdr = verdicthdr_get(nfqa); |
765 | if (!vhdr) | |
84a797dd | 766 | return -EINVAL; |
7af4cc3f | 767 | |
7af4cc3f HW |
768 | verdict = ntohl(vhdr->verdict); |
769 | ||
b43d8d85 | 770 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
84a797dd ED |
771 | if (entry == NULL) |
772 | return -ENOENT; | |
7af4cc3f | 773 | |
9cb01766 | 774 | rcu_read_lock(); |
7c622345 PNA |
775 | if (nfqa[NFQA_CT] && (queue->flags & NFQA_CFG_F_CONNTRACK)) |
776 | ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo); | |
9cb01766 | 777 | |
df6fb868 | 778 | if (nfqa[NFQA_PAYLOAD]) { |
8c88f87c PNA |
779 | u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); |
780 | int diff = payload_len - entry->skb->len; | |
781 | ||
df6fb868 | 782 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), |
8c88f87c | 783 | payload_len, entry, diff) < 0) |
7af4cc3f | 784 | verdict = NF_DROP; |
8c88f87c | 785 | |
7c622345 PNA |
786 | if (ct) |
787 | nfqnl_ct_seq_adjust(skb, ct, ctinfo, diff); | |
7af4cc3f | 788 | } |
8c88f87c | 789 | rcu_read_unlock(); |
7af4cc3f | 790 | |
df6fb868 | 791 | if (nfqa[NFQA_MARK]) |
ea3a66ff | 792 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
601e68e1 | 793 | |
4b3d15ef | 794 | nf_reinject(entry, verdict); |
7af4cc3f HW |
795 | return 0; |
796 | } | |
797 | ||
798 | static int | |
799 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
800 | const struct nlmsghdr *nlh, |
801 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
802 | { |
803 | return -ENOTSUPP; | |
804 | } | |
805 | ||
5bf75853 PM |
806 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
807 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
808 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
838ab636 HW |
809 | }; |
810 | ||
e3ac5298 | 811 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
812 | .outfn = &nfqnl_enqueue_packet, |
813 | }; | |
814 | ||
7af4cc3f HW |
815 | static int |
816 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
817 | const struct nlmsghdr *nlh, |
818 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 819 | { |
3da07c0c | 820 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
821 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
822 | struct nfqnl_instance *queue; | |
9872bec7 | 823 | struct nfqnl_msg_config_cmd *cmd = NULL; |
838ab636 | 824 | int ret = 0; |
7af4cc3f | 825 | |
9872bec7 PM |
826 | if (nfqa[NFQA_CFG_CMD]) { |
827 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); | |
828 | ||
0360ae41 | 829 | /* Obsolete commands without queue context */ |
9872bec7 | 830 | switch (cmd->command) { |
0360ae41 FW |
831 | case NFQNL_CFG_CMD_PF_BIND: return 0; |
832 | case NFQNL_CFG_CMD_PF_UNBIND: return 0; | |
9872bec7 | 833 | } |
9872bec7 PM |
834 | } |
835 | ||
836 | rcu_read_lock(); | |
837 | queue = instance_lookup(queue_num); | |
15e47304 | 838 | if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { |
a3c8e7fd | 839 | ret = -EPERM; |
9872bec7 | 840 | goto err_out_unlock; |
a3c8e7fd PM |
841 | } |
842 | ||
9872bec7 | 843 | if (cmd != NULL) { |
7af4cc3f HW |
844 | switch (cmd->command) { |
845 | case NFQNL_CFG_CMD_BIND: | |
9872bec7 PM |
846 | if (queue) { |
847 | ret = -EBUSY; | |
848 | goto err_out_unlock; | |
849 | } | |
15e47304 | 850 | queue = instance_create(queue_num, NETLINK_CB(skb).portid); |
baab2ce7 PM |
851 | if (IS_ERR(queue)) { |
852 | ret = PTR_ERR(queue); | |
9872bec7 PM |
853 | goto err_out_unlock; |
854 | } | |
7af4cc3f HW |
855 | break; |
856 | case NFQNL_CFG_CMD_UNBIND: | |
9872bec7 PM |
857 | if (!queue) { |
858 | ret = -ENODEV; | |
859 | goto err_out_unlock; | |
860 | } | |
7af4cc3f HW |
861 | instance_destroy(queue); |
862 | break; | |
863 | case NFQNL_CFG_CMD_PF_BIND: | |
7af4cc3f | 864 | case NFQNL_CFG_CMD_PF_UNBIND: |
7af4cc3f HW |
865 | break; |
866 | default: | |
cd21f0ac | 867 | ret = -ENOTSUPP; |
838ab636 | 868 | break; |
7af4cc3f | 869 | } |
7af4cc3f HW |
870 | } |
871 | ||
df6fb868 | 872 | if (nfqa[NFQA_CFG_PARAMS]) { |
7af4cc3f | 873 | struct nfqnl_msg_config_params *params; |
7af4cc3f | 874 | |
406dbfc9 | 875 | if (!queue) { |
a3c8e7fd | 876 | ret = -ENODEV; |
9872bec7 | 877 | goto err_out_unlock; |
406dbfc9 | 878 | } |
df6fb868 | 879 | params = nla_data(nfqa[NFQA_CFG_PARAMS]); |
7af4cc3f HW |
880 | nfqnl_set_mode(queue, params->copy_mode, |
881 | ntohl(params->copy_range)); | |
882 | } | |
883 | ||
df6fb868 | 884 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
829e17a1 | 885 | __be32 *queue_maxlen; |
a3c8e7fd PM |
886 | |
887 | if (!queue) { | |
888 | ret = -ENODEV; | |
9872bec7 | 889 | goto err_out_unlock; |
a3c8e7fd | 890 | } |
df6fb868 | 891 | queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
829e17a1 EL |
892 | spin_lock_bh(&queue->lock); |
893 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
894 | spin_unlock_bh(&queue->lock); | |
895 | } | |
896 | ||
fdb694a0 KK |
897 | if (nfqa[NFQA_CFG_FLAGS]) { |
898 | __u32 flags, mask; | |
899 | ||
900 | if (!queue) { | |
901 | ret = -ENODEV; | |
902 | goto err_out_unlock; | |
903 | } | |
904 | ||
905 | if (!nfqa[NFQA_CFG_MASK]) { | |
906 | /* A mask is needed to specify which flags are being | |
907 | * changed. | |
908 | */ | |
909 | ret = -EINVAL; | |
910 | goto err_out_unlock; | |
911 | } | |
912 | ||
913 | flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); | |
914 | mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); | |
915 | ||
46ba5a25 KK |
916 | if (flags >= NFQA_CFG_F_MAX) { |
917 | ret = -EOPNOTSUPP; | |
918 | goto err_out_unlock; | |
919 | } | |
920 | ||
fdb694a0 KK |
921 | spin_lock_bh(&queue->lock); |
922 | queue->flags &= ~mask; | |
923 | queue->flags |= flags & mask; | |
924 | spin_unlock_bh(&queue->lock); | |
925 | } | |
926 | ||
9872bec7 PM |
927 | err_out_unlock: |
928 | rcu_read_unlock(); | |
838ab636 | 929 | return ret; |
7af4cc3f HW |
930 | } |
931 | ||
7c8d4cb4 | 932 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
84a797dd | 933 | [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, |
37d2e7a2 | 934 | .attr_count = NFQA_MAX, }, |
84a797dd | 935 | [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, |
5bf75853 PM |
936 | .attr_count = NFQA_MAX, |
937 | .policy = nfqa_verdict_policy }, | |
7af4cc3f | 938 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
5bf75853 PM |
939 | .attr_count = NFQA_CFG_MAX, |
940 | .policy = nfqa_cfg_policy }, | |
97d32cf9 FW |
941 | [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, |
942 | .attr_count = NFQA_MAX, | |
943 | .policy = nfqa_verdict_batch_policy }, | |
7af4cc3f HW |
944 | }; |
945 | ||
7c8d4cb4 | 946 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
947 | .name = "nf_queue", |
948 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
949 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
950 | .cb = nfqnl_cb, |
951 | }; | |
952 | ||
838ab636 HW |
953 | #ifdef CONFIG_PROC_FS |
954 | struct iter_state { | |
955 | unsigned int bucket; | |
956 | }; | |
957 | ||
958 | static struct hlist_node *get_first(struct seq_file *seq) | |
959 | { | |
960 | struct iter_state *st = seq->private; | |
961 | ||
962 | if (!st) | |
963 | return NULL; | |
964 | ||
965 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
966 | if (!hlist_empty(&instance_table[st->bucket])) | |
967 | return instance_table[st->bucket].first; | |
968 | } | |
969 | return NULL; | |
970 | } | |
971 | ||
972 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
973 | { | |
974 | struct iter_state *st = seq->private; | |
975 | ||
976 | h = h->next; | |
977 | while (!h) { | |
978 | if (++st->bucket >= INSTANCE_BUCKETS) | |
979 | return NULL; | |
980 | ||
981 | h = instance_table[st->bucket].first; | |
982 | } | |
983 | return h; | |
984 | } | |
985 | ||
986 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
987 | { | |
988 | struct hlist_node *head; | |
989 | head = get_first(seq); | |
990 | ||
991 | if (head) | |
992 | while (pos && (head = get_next(seq, head))) | |
993 | pos--; | |
994 | return pos ? NULL : head; | |
995 | } | |
996 | ||
997 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
ca7c48ca | 998 | __acquires(instances_lock) |
838ab636 | 999 | { |
9872bec7 | 1000 | spin_lock(&instances_lock); |
838ab636 HW |
1001 | return get_idx(seq, *pos); |
1002 | } | |
1003 | ||
1004 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1005 | { | |
1006 | (*pos)++; | |
1007 | return get_next(s, v); | |
1008 | } | |
1009 | ||
1010 | static void seq_stop(struct seq_file *s, void *v) | |
ca7c48ca | 1011 | __releases(instances_lock) |
838ab636 | 1012 | { |
9872bec7 | 1013 | spin_unlock(&instances_lock); |
838ab636 HW |
1014 | } |
1015 | ||
1016 | static int seq_show(struct seq_file *s, void *v) | |
1017 | { | |
1018 | const struct nfqnl_instance *inst = v; | |
1019 | ||
1020 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", | |
1021 | inst->queue_num, | |
15e47304 | 1022 | inst->peer_portid, inst->queue_total, |
838ab636 HW |
1023 | inst->copy_mode, inst->copy_range, |
1024 | inst->queue_dropped, inst->queue_user_dropped, | |
5863702a | 1025 | inst->id_sequence, 1); |
838ab636 HW |
1026 | } |
1027 | ||
56b3d975 | 1028 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
1029 | .start = seq_start, |
1030 | .next = seq_next, | |
1031 | .stop = seq_stop, | |
1032 | .show = seq_show, | |
1033 | }; | |
1034 | ||
1035 | static int nfqnl_open(struct inode *inode, struct file *file) | |
1036 | { | |
e2da5913 PE |
1037 | return seq_open_private(file, &nfqnl_seq_ops, |
1038 | sizeof(struct iter_state)); | |
838ab636 HW |
1039 | } |
1040 | ||
da7071d7 | 1041 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
1042 | .owner = THIS_MODULE, |
1043 | .open = nfqnl_open, | |
1044 | .read = seq_read, | |
1045 | .llseek = seq_lseek, | |
1046 | .release = seq_release_private, | |
1047 | }; | |
1048 | ||
1049 | #endif /* PROC_FS */ | |
1050 | ||
32292a7f | 1051 | static int __init nfnetlink_queue_init(void) |
7af4cc3f | 1052 | { |
838ab636 | 1053 | int i, status = -ENOMEM; |
601e68e1 | 1054 | |
838ab636 HW |
1055 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
1056 | INIT_HLIST_HEAD(&instance_table[i]); | |
1057 | ||
7af4cc3f HW |
1058 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1059 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1060 | if (status < 0) { | |
1061 | printk(KERN_ERR "nf_queue: failed to create netlink socket\n"); | |
1062 | goto cleanup_netlink_notifier; | |
1063 | } | |
1064 | ||
838ab636 | 1065 | #ifdef CONFIG_PROC_FS |
8eeee8b1 DL |
1066 | if (!proc_create("nfnetlink_queue", 0440, |
1067 | proc_net_netfilter, &nfqnl_file_ops)) | |
838ab636 | 1068 | goto cleanup_subsys; |
838ab636 HW |
1069 | #endif |
1070 | ||
7af4cc3f | 1071 | register_netdevice_notifier(&nfqnl_dev_notifier); |
0360ae41 | 1072 | nf_register_queue_handler(&nfqh); |
7af4cc3f HW |
1073 | return status; |
1074 | ||
838ab636 HW |
1075 | #ifdef CONFIG_PROC_FS |
1076 | cleanup_subsys: | |
7af4cc3f | 1077 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
32292a7f | 1078 | #endif |
7af4cc3f HW |
1079 | cleanup_netlink_notifier: |
1080 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
1081 | return status; | |
1082 | } | |
1083 | ||
65b4b4e8 | 1084 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1085 | { |
0360ae41 | 1086 | nf_unregister_queue_handler(); |
32292a7f PM |
1087 | unregister_netdevice_notifier(&nfqnl_dev_notifier); |
1088 | #ifdef CONFIG_PROC_FS | |
1089 | remove_proc_entry("nfnetlink_queue", proc_net_netfilter); | |
1090 | #endif | |
1091 | nfnetlink_subsys_unregister(&nfqnl_subsys); | |
1092 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
67137f3c JDB |
1093 | |
1094 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
7af4cc3f HW |
1095 | } |
1096 | ||
1097 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1098 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1099 | MODULE_LICENSE("GPL"); | |
1100 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1101 | ||
65b4b4e8 AM |
1102 | module_init(nfnetlink_queue_init); |
1103 | module_exit(nfnetlink_queue_fini); |