Commit | Line | Data |
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c7232c99 PM |
1 | /* |
2 | * (C) 1999-2001 Paul `Rusty' Russell | |
5b1158e9 | 3 | * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org> |
c7232c99 | 4 | * (C) 2011 Patrick McHardy <kaber@trash.net> |
5b1158e9 JK |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/types.h> | |
13 | #include <linux/timer.h> | |
14 | #include <linux/skbuff.h> | |
5a0e3ad6 | 15 | #include <linux/gfp.h> |
c7232c99 | 16 | #include <net/xfrm.h> |
5b1158e9 | 17 | #include <linux/jhash.h> |
c7232c99 | 18 | #include <linux/rtnetlink.h> |
5b1158e9 | 19 | |
5b1158e9 JK |
20 | #include <net/netfilter/nf_conntrack.h> |
21 | #include <net/netfilter/nf_conntrack_core.h> | |
22 | #include <net/netfilter/nf_nat.h> | |
c7232c99 PM |
23 | #include <net/netfilter/nf_nat_l3proto.h> |
24 | #include <net/netfilter/nf_nat_l4proto.h> | |
5b1158e9 JK |
25 | #include <net/netfilter/nf_nat_core.h> |
26 | #include <net/netfilter/nf_nat_helper.h> | |
27 | #include <net/netfilter/nf_conntrack_helper.h> | |
41d73ec0 | 28 | #include <net/netfilter/nf_conntrack_seqadj.h> |
5b1158e9 | 29 | #include <net/netfilter/nf_conntrack_l3proto.h> |
5d0aa2cc | 30 | #include <net/netfilter/nf_conntrack_zones.h> |
c7232c99 | 31 | #include <linux/netfilter/nf_nat.h> |
5b1158e9 | 32 | |
02502f62 | 33 | static DEFINE_SPINLOCK(nf_nat_lock); |
5b1158e9 | 34 | |
c7232c99 PM |
35 | static DEFINE_MUTEX(nf_nat_proto_mutex); |
36 | static const struct nf_nat_l3proto __rcu *nf_nat_l3protos[NFPROTO_NUMPROTO] | |
37 | __read_mostly; | |
38 | static const struct nf_nat_l4proto __rcu **nf_nat_l4protos[NFPROTO_NUMPROTO] | |
ce4b1ceb | 39 | __read_mostly; |
a76ae1c8 FW |
40 | |
41 | static struct hlist_head *nf_nat_bysource __read_mostly; | |
42 | static unsigned int nf_nat_htable_size __read_mostly; | |
7001c6d1 | 43 | static unsigned int nf_nat_hash_rnd __read_mostly; |
c7232c99 PM |
44 | |
45 | inline const struct nf_nat_l3proto * | |
46 | __nf_nat_l3proto_find(u8 family) | |
5b1158e9 | 47 | { |
c7232c99 | 48 | return rcu_dereference(nf_nat_l3protos[family]); |
5b1158e9 JK |
49 | } |
50 | ||
c7232c99 PM |
51 | inline const struct nf_nat_l4proto * |
52 | __nf_nat_l4proto_find(u8 family, u8 protonum) | |
53 | { | |
54 | return rcu_dereference(nf_nat_l4protos[family][protonum]); | |
55 | } | |
56 | EXPORT_SYMBOL_GPL(__nf_nat_l4proto_find); | |
57 | ||
58 | #ifdef CONFIG_XFRM | |
59 | static void __nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl) | |
60 | { | |
61 | const struct nf_nat_l3proto *l3proto; | |
62 | const struct nf_conn *ct; | |
63 | enum ip_conntrack_info ctinfo; | |
64 | enum ip_conntrack_dir dir; | |
65 | unsigned long statusbit; | |
66 | u8 family; | |
67 | ||
68 | ct = nf_ct_get(skb, &ctinfo); | |
69 | if (ct == NULL) | |
70 | return; | |
71 | ||
72 | family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; | |
73 | rcu_read_lock(); | |
74 | l3proto = __nf_nat_l3proto_find(family); | |
75 | if (l3proto == NULL) | |
76 | goto out; | |
77 | ||
78 | dir = CTINFO2DIR(ctinfo); | |
79 | if (dir == IP_CT_DIR_ORIGINAL) | |
80 | statusbit = IPS_DST_NAT; | |
81 | else | |
82 | statusbit = IPS_SRC_NAT; | |
83 | ||
84 | l3proto->decode_session(skb, ct, dir, statusbit, fl); | |
85 | out: | |
86 | rcu_read_unlock(); | |
87 | } | |
88 | ||
c7af6483 | 89 | int nf_xfrm_me_harder(struct net *net, struct sk_buff *skb, unsigned int family) |
c7232c99 PM |
90 | { |
91 | struct flowi fl; | |
92 | unsigned int hh_len; | |
93 | struct dst_entry *dst; | |
aaa795ad | 94 | int err; |
c7232c99 | 95 | |
aaa795ad | 96 | err = xfrm_decode_session(skb, &fl, family); |
e7e6f630 | 97 | if (err < 0) |
aaa795ad | 98 | return err; |
c7232c99 PM |
99 | |
100 | dst = skb_dst(skb); | |
101 | if (dst->xfrm) | |
102 | dst = ((struct xfrm_dst *)dst)->route; | |
103 | dst_hold(dst); | |
104 | ||
c7af6483 | 105 | dst = xfrm_lookup(net, dst, &fl, skb->sk, 0); |
c7232c99 | 106 | if (IS_ERR(dst)) |
aaa795ad | 107 | return PTR_ERR(dst); |
c7232c99 PM |
108 | |
109 | skb_dst_drop(skb); | |
110 | skb_dst_set(skb, dst); | |
111 | ||
112 | /* Change in oif may mean change in hh_len. */ | |
113 | hh_len = skb_dst(skb)->dev->hard_header_len; | |
114 | if (skb_headroom(skb) < hh_len && | |
115 | pskb_expand_head(skb, hh_len - skb_headroom(skb), 0, GFP_ATOMIC)) | |
aaa795ad | 116 | return -ENOMEM; |
c7232c99 PM |
117 | return 0; |
118 | } | |
119 | EXPORT_SYMBOL(nf_xfrm_me_harder); | |
120 | #endif /* CONFIG_XFRM */ | |
121 | ||
5b1158e9 JK |
122 | /* We keep an extra hash for each conntrack, for fast searching. */ |
123 | static inline unsigned int | |
464c3855 | 124 | hash_by_src(const struct net *n, const struct nf_conntrack_tuple *tuple) |
5b1158e9 | 125 | { |
34498825 PM |
126 | unsigned int hash; |
127 | ||
7001c6d1 FW |
128 | get_random_once(&nf_nat_hash_rnd, sizeof(nf_nat_hash_rnd)); |
129 | ||
5b1158e9 | 130 | /* Original src, to ensure we map it consistently if poss. */ |
c7232c99 | 131 | hash = jhash2((u32 *)&tuple->src, sizeof(tuple->src) / sizeof(u32), |
464c3855 | 132 | tuple->dst.protonum ^ nf_nat_hash_rnd ^ net_hash_mix(n)); |
8fc54f68 | 133 | |
a76ae1c8 | 134 | return reciprocal_scale(hash, nf_nat_htable_size); |
5b1158e9 JK |
135 | } |
136 | ||
5b1158e9 JK |
137 | /* Is this tuple already taken? (not by us) */ |
138 | int | |
139 | nf_nat_used_tuple(const struct nf_conntrack_tuple *tuple, | |
140 | const struct nf_conn *ignored_conntrack) | |
141 | { | |
142 | /* Conntrack tracking doesn't keep track of outgoing tuples; only | |
c7232c99 PM |
143 | * incoming ones. NAT means they don't have a fixed mapping, |
144 | * so we invert the tuple and look for the incoming reply. | |
145 | * | |
146 | * We could keep a separate hash if this proves too slow. | |
147 | */ | |
5b1158e9 JK |
148 | struct nf_conntrack_tuple reply; |
149 | ||
150 | nf_ct_invert_tuplepr(&reply, tuple); | |
151 | return nf_conntrack_tuple_taken(&reply, ignored_conntrack); | |
152 | } | |
153 | EXPORT_SYMBOL(nf_nat_used_tuple); | |
154 | ||
155 | /* If we source map this tuple so reply looks like reply_tuple, will | |
c7232c99 PM |
156 | * that meet the constraints of range. |
157 | */ | |
158 | static int in_range(const struct nf_nat_l3proto *l3proto, | |
159 | const struct nf_nat_l4proto *l4proto, | |
160 | const struct nf_conntrack_tuple *tuple, | |
161 | const struct nf_nat_range *range) | |
5b1158e9 | 162 | { |
5b1158e9 | 163 | /* If we are supposed to map IPs, then we must be in the |
c7232c99 PM |
164 | * range specified, otherwise let this drag us onto a new src IP. |
165 | */ | |
166 | if (range->flags & NF_NAT_RANGE_MAP_IPS && | |
167 | !l3proto->in_range(tuple, range)) | |
168 | return 0; | |
5b1158e9 | 169 | |
cbc9f2f4 | 170 | if (!(range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) || |
c7232c99 PM |
171 | l4proto->in_range(tuple, NF_NAT_MANIP_SRC, |
172 | &range->min_proto, &range->max_proto)) | |
173 | return 1; | |
5b1158e9 | 174 | |
c7232c99 | 175 | return 0; |
5b1158e9 JK |
176 | } |
177 | ||
178 | static inline int | |
179 | same_src(const struct nf_conn *ct, | |
180 | const struct nf_conntrack_tuple *tuple) | |
181 | { | |
182 | const struct nf_conntrack_tuple *t; | |
183 | ||
184 | t = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple; | |
185 | return (t->dst.protonum == tuple->dst.protonum && | |
c7232c99 | 186 | nf_inet_addr_cmp(&t->src.u3, &tuple->src.u3) && |
5b1158e9 JK |
187 | t->src.u.all == tuple->src.u.all); |
188 | } | |
189 | ||
190 | /* Only called for SRC manip */ | |
191 | static int | |
308ac914 DB |
192 | find_appropriate_src(struct net *net, |
193 | const struct nf_conntrack_zone *zone, | |
c7232c99 PM |
194 | const struct nf_nat_l3proto *l3proto, |
195 | const struct nf_nat_l4proto *l4proto, | |
0c4c9288 | 196 | const struct nf_conntrack_tuple *tuple, |
5b1158e9 | 197 | struct nf_conntrack_tuple *result, |
c7232c99 | 198 | const struct nf_nat_range *range) |
5b1158e9 | 199 | { |
deedb590 | 200 | unsigned int h = hash_by_src(net, tuple); |
72b72949 JE |
201 | const struct nf_conn_nat *nat; |
202 | const struct nf_conn *ct; | |
5b1158e9 | 203 | |
a76ae1c8 | 204 | hlist_for_each_entry_rcu(nat, &nf_nat_bysource[h], bysource) { |
b6b84d4a | 205 | ct = nat->ct; |
deedb590 | 206 | if (same_src(ct, tuple) && |
a76ae1c8 | 207 | net_eq(net, nf_ct_net(ct)) && |
deedb590 | 208 | nf_ct_zone_equal(ct, zone, IP_CT_DIR_ORIGINAL)) { |
5b1158e9 JK |
209 | /* Copy source part from reply tuple. */ |
210 | nf_ct_invert_tuplepr(result, | |
211 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); | |
212 | result->dst = tuple->dst; | |
213 | ||
136251d0 | 214 | if (in_range(l3proto, l4proto, result, range)) |
5b1158e9 | 215 | return 1; |
5b1158e9 JK |
216 | } |
217 | } | |
5b1158e9 JK |
218 | return 0; |
219 | } | |
220 | ||
221 | /* For [FUTURE] fragmentation handling, we want the least-used | |
c7232c99 PM |
222 | * src-ip/dst-ip/proto triple. Fairness doesn't come into it. Thus |
223 | * if the range specifies 1.2.3.4 ports 10000-10005 and 1.2.3.5 ports | |
224 | * 1-65535, we don't do pro-rata allocation based on ports; we choose | |
225 | * the ip with the lowest src-ip/dst-ip/proto usage. | |
226 | */ | |
5b1158e9 | 227 | static void |
308ac914 DB |
228 | find_best_ips_proto(const struct nf_conntrack_zone *zone, |
229 | struct nf_conntrack_tuple *tuple, | |
c7232c99 | 230 | const struct nf_nat_range *range, |
5b1158e9 JK |
231 | const struct nf_conn *ct, |
232 | enum nf_nat_manip_type maniptype) | |
233 | { | |
c7232c99 PM |
234 | union nf_inet_addr *var_ipp; |
235 | unsigned int i, max; | |
5b1158e9 | 236 | /* Host order */ |
c7232c99 PM |
237 | u32 minip, maxip, j, dist; |
238 | bool full_range; | |
5b1158e9 JK |
239 | |
240 | /* No IP mapping? Do nothing. */ | |
cbc9f2f4 | 241 | if (!(range->flags & NF_NAT_RANGE_MAP_IPS)) |
5b1158e9 JK |
242 | return; |
243 | ||
cbc9f2f4 | 244 | if (maniptype == NF_NAT_MANIP_SRC) |
c7232c99 | 245 | var_ipp = &tuple->src.u3; |
5b1158e9 | 246 | else |
c7232c99 | 247 | var_ipp = &tuple->dst.u3; |
5b1158e9 JK |
248 | |
249 | /* Fast path: only one choice. */ | |
c7232c99 PM |
250 | if (nf_inet_addr_cmp(&range->min_addr, &range->max_addr)) { |
251 | *var_ipp = range->min_addr; | |
5b1158e9 JK |
252 | return; |
253 | } | |
254 | ||
c7232c99 PM |
255 | if (nf_ct_l3num(ct) == NFPROTO_IPV4) |
256 | max = sizeof(var_ipp->ip) / sizeof(u32) - 1; | |
257 | else | |
258 | max = sizeof(var_ipp->ip6) / sizeof(u32) - 1; | |
259 | ||
5b1158e9 JK |
260 | /* Hashing source and destination IPs gives a fairly even |
261 | * spread in practice (if there are a small number of IPs | |
262 | * involved, there usually aren't that many connections | |
263 | * anyway). The consistency means that servers see the same | |
264 | * client coming from the same IP (some Internet Banking sites | |
c7232c99 PM |
265 | * like this), even across reboots. |
266 | */ | |
5693d68d | 267 | j = jhash2((u32 *)&tuple->src.u3, sizeof(tuple->src.u3) / sizeof(u32), |
c7232c99 | 268 | range->flags & NF_NAT_RANGE_PERSISTENT ? |
308ac914 | 269 | 0 : (__force u32)tuple->dst.u3.all[max] ^ zone->id); |
c7232c99 PM |
270 | |
271 | full_range = false; | |
272 | for (i = 0; i <= max; i++) { | |
273 | /* If first bytes of the address are at the maximum, use the | |
274 | * distance. Otherwise use the full range. | |
275 | */ | |
276 | if (!full_range) { | |
277 | minip = ntohl((__force __be32)range->min_addr.all[i]); | |
278 | maxip = ntohl((__force __be32)range->max_addr.all[i]); | |
279 | dist = maxip - minip + 1; | |
280 | } else { | |
281 | minip = 0; | |
282 | dist = ~0; | |
283 | } | |
284 | ||
285 | var_ipp->all[i] = (__force __u32) | |
8fc54f68 | 286 | htonl(minip + reciprocal_scale(j, dist)); |
c7232c99 PM |
287 | if (var_ipp->all[i] != range->max_addr.all[i]) |
288 | full_range = true; | |
289 | ||
290 | if (!(range->flags & NF_NAT_RANGE_PERSISTENT)) | |
291 | j ^= (__force u32)tuple->dst.u3.all[i]; | |
292 | } | |
5b1158e9 JK |
293 | } |
294 | ||
c7232c99 PM |
295 | /* Manipulate the tuple into the range given. For NF_INET_POST_ROUTING, |
296 | * we change the source to map into the range. For NF_INET_PRE_ROUTING | |
6e23ae2a | 297 | * and NF_INET_LOCAL_OUT, we change the destination to map into the |
c7232c99 | 298 | * range. It might not be possible to get a unique tuple, but we try. |
5b1158e9 JK |
299 | * At worst (or if we race), we will end up with a final duplicate in |
300 | * __ip_conntrack_confirm and drop the packet. */ | |
301 | static void | |
302 | get_unique_tuple(struct nf_conntrack_tuple *tuple, | |
303 | const struct nf_conntrack_tuple *orig_tuple, | |
c7232c99 | 304 | const struct nf_nat_range *range, |
5b1158e9 JK |
305 | struct nf_conn *ct, |
306 | enum nf_nat_manip_type maniptype) | |
307 | { | |
308ac914 | 308 | const struct nf_conntrack_zone *zone; |
c7232c99 PM |
309 | const struct nf_nat_l3proto *l3proto; |
310 | const struct nf_nat_l4proto *l4proto; | |
0c4c9288 | 311 | struct net *net = nf_ct_net(ct); |
308ac914 DB |
312 | |
313 | zone = nf_ct_zone(ct); | |
5b1158e9 | 314 | |
c7232c99 PM |
315 | rcu_read_lock(); |
316 | l3proto = __nf_nat_l3proto_find(orig_tuple->src.l3num); | |
317 | l4proto = __nf_nat_l4proto_find(orig_tuple->src.l3num, | |
318 | orig_tuple->dst.protonum); | |
5b1158e9 | 319 | |
c7232c99 PM |
320 | /* 1) If this srcip/proto/src-proto-part is currently mapped, |
321 | * and that same mapping gives a unique tuple within the given | |
322 | * range, use that. | |
323 | * | |
324 | * This is only required for source (ie. NAT/masq) mappings. | |
325 | * So far, we don't do local source mappings, so multiple | |
326 | * manips not an issue. | |
327 | */ | |
cbc9f2f4 | 328 | if (maniptype == NF_NAT_MANIP_SRC && |
34ce3240 | 329 | !(range->flags & NF_NAT_RANGE_PROTO_RANDOM_ALL)) { |
41a7cab6 | 330 | /* try the original tuple first */ |
c7232c99 | 331 | if (in_range(l3proto, l4proto, orig_tuple, range)) { |
41a7cab6 CG |
332 | if (!nf_nat_used_tuple(orig_tuple, ct)) { |
333 | *tuple = *orig_tuple; | |
c7232c99 | 334 | goto out; |
41a7cab6 | 335 | } |
c7232c99 PM |
336 | } else if (find_appropriate_src(net, zone, l3proto, l4proto, |
337 | orig_tuple, tuple, range)) { | |
0d53778e | 338 | pr_debug("get_unique_tuple: Found current src map\n"); |
0dbff689 | 339 | if (!nf_nat_used_tuple(tuple, ct)) |
c7232c99 | 340 | goto out; |
5b1158e9 JK |
341 | } |
342 | } | |
343 | ||
c7232c99 | 344 | /* 2) Select the least-used IP/proto combination in the given range */ |
5b1158e9 | 345 | *tuple = *orig_tuple; |
5d0aa2cc | 346 | find_best_ips_proto(zone, tuple, range, ct, maniptype); |
5b1158e9 JK |
347 | |
348 | /* 3) The per-protocol part of the manip is made to map into | |
c7232c99 PM |
349 | * the range to make a unique tuple. |
350 | */ | |
5b1158e9 JK |
351 | |
352 | /* Only bother mapping if it's not already in range and unique */ | |
34ce3240 | 353 | if (!(range->flags & NF_NAT_RANGE_PROTO_RANDOM_ALL)) { |
cbc9f2f4 | 354 | if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) { |
c7232c99 PM |
355 | if (l4proto->in_range(tuple, maniptype, |
356 | &range->min_proto, | |
357 | &range->max_proto) && | |
358 | (range->min_proto.all == range->max_proto.all || | |
99ad3c53 CG |
359 | !nf_nat_used_tuple(tuple, ct))) |
360 | goto out; | |
361 | } else if (!nf_nat_used_tuple(tuple, ct)) { | |
362 | goto out; | |
363 | } | |
364 | } | |
5b1158e9 JK |
365 | |
366 | /* Last change: get protocol to try to obtain unique tuple. */ | |
c7232c99 | 367 | l4proto->unique_tuple(l3proto, tuple, range, maniptype, ct); |
e22a0548 PM |
368 | out: |
369 | rcu_read_unlock(); | |
5b1158e9 JK |
370 | } |
371 | ||
f768e5bd FW |
372 | struct nf_conn_nat *nf_ct_nat_ext_add(struct nf_conn *ct) |
373 | { | |
374 | struct nf_conn_nat *nat = nfct_nat(ct); | |
375 | if (nat) | |
376 | return nat; | |
377 | ||
378 | if (!nf_ct_is_confirmed(ct)) | |
379 | nat = nf_ct_ext_add(ct, NF_CT_EXT_NAT, GFP_ATOMIC); | |
380 | ||
381 | return nat; | |
382 | } | |
383 | EXPORT_SYMBOL_GPL(nf_ct_nat_ext_add); | |
384 | ||
5b1158e9 JK |
385 | unsigned int |
386 | nf_nat_setup_info(struct nf_conn *ct, | |
c7232c99 | 387 | const struct nf_nat_range *range, |
cc01dcbd | 388 | enum nf_nat_manip_type maniptype) |
5b1158e9 | 389 | { |
0c4c9288 | 390 | struct net *net = nf_ct_net(ct); |
5b1158e9 | 391 | struct nf_conntrack_tuple curr_tuple, new_tuple; |
2d59e5ca | 392 | struct nf_conn_nat *nat; |
5b1158e9 | 393 | |
2d59e5ca | 394 | /* nat helper or nfctnetlink also setup binding */ |
f768e5bd FW |
395 | nat = nf_ct_nat_ext_add(ct); |
396 | if (nat == NULL) | |
397 | return NF_ACCEPT; | |
2d59e5ca | 398 | |
cbc9f2f4 PM |
399 | NF_CT_ASSERT(maniptype == NF_NAT_MANIP_SRC || |
400 | maniptype == NF_NAT_MANIP_DST); | |
5b1158e9 JK |
401 | BUG_ON(nf_nat_initialized(ct, maniptype)); |
402 | ||
403 | /* What we've got will look like inverse of reply. Normally | |
c7232c99 PM |
404 | * this is what is in the conntrack, except for prior |
405 | * manipulations (future optimization: if num_manips == 0, | |
406 | * orig_tp = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple) | |
407 | */ | |
5b1158e9 JK |
408 | nf_ct_invert_tuplepr(&curr_tuple, |
409 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); | |
410 | ||
411 | get_unique_tuple(&new_tuple, &curr_tuple, range, ct, maniptype); | |
412 | ||
413 | if (!nf_ct_tuple_equal(&new_tuple, &curr_tuple)) { | |
414 | struct nf_conntrack_tuple reply; | |
415 | ||
416 | /* Alter conntrack table so will recognize replies. */ | |
417 | nf_ct_invert_tuplepr(&reply, &new_tuple); | |
418 | nf_conntrack_alter_reply(ct, &reply); | |
419 | ||
420 | /* Non-atomic: we own this at the moment. */ | |
cbc9f2f4 | 421 | if (maniptype == NF_NAT_MANIP_SRC) |
5b1158e9 JK |
422 | ct->status |= IPS_SRC_NAT; |
423 | else | |
424 | ct->status |= IPS_DST_NAT; | |
41d73ec0 PM |
425 | |
426 | if (nfct_help(ct)) | |
427 | nfct_seqadj_ext_add(ct); | |
5b1158e9 JK |
428 | } |
429 | ||
cbc9f2f4 | 430 | if (maniptype == NF_NAT_MANIP_SRC) { |
5b1158e9 JK |
431 | unsigned int srchash; |
432 | ||
deedb590 | 433 | srchash = hash_by_src(net, |
5d0aa2cc | 434 | &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
02502f62 | 435 | spin_lock_bh(&nf_nat_lock); |
c7232c99 | 436 | /* nf_conntrack_alter_reply might re-allocate extension aera */ |
b6b84d4a YK |
437 | nat = nfct_nat(ct); |
438 | nat->ct = ct; | |
0c4c9288 | 439 | hlist_add_head_rcu(&nat->bysource, |
a76ae1c8 | 440 | &nf_nat_bysource[srchash]); |
02502f62 | 441 | spin_unlock_bh(&nf_nat_lock); |
5b1158e9 JK |
442 | } |
443 | ||
444 | /* It's done. */ | |
cbc9f2f4 | 445 | if (maniptype == NF_NAT_MANIP_DST) |
a7c2f4d7 | 446 | ct->status |= IPS_DST_NAT_DONE; |
5b1158e9 | 447 | else |
a7c2f4d7 | 448 | ct->status |= IPS_SRC_NAT_DONE; |
5b1158e9 JK |
449 | |
450 | return NF_ACCEPT; | |
451 | } | |
452 | EXPORT_SYMBOL(nf_nat_setup_info); | |
453 | ||
0eba801b PNA |
454 | static unsigned int |
455 | __nf_nat_alloc_null_binding(struct nf_conn *ct, enum nf_nat_manip_type manip) | |
f59cb045 PNA |
456 | { |
457 | /* Force range to this IP; let proto decide mapping for | |
458 | * per-proto parts (hence not IP_NAT_RANGE_PROTO_SPECIFIED). | |
459 | * Use reply in case it's already been mangled (eg local packet). | |
460 | */ | |
461 | union nf_inet_addr ip = | |
0eba801b | 462 | (manip == NF_NAT_MANIP_SRC ? |
f59cb045 PNA |
463 | ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3 : |
464 | ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3); | |
465 | struct nf_nat_range range = { | |
466 | .flags = NF_NAT_RANGE_MAP_IPS, | |
467 | .min_addr = ip, | |
468 | .max_addr = ip, | |
469 | }; | |
0eba801b PNA |
470 | return nf_nat_setup_info(ct, &range, manip); |
471 | } | |
472 | ||
473 | unsigned int | |
474 | nf_nat_alloc_null_binding(struct nf_conn *ct, unsigned int hooknum) | |
475 | { | |
476 | return __nf_nat_alloc_null_binding(ct, HOOK2MANIP(hooknum)); | |
f59cb045 PNA |
477 | } |
478 | EXPORT_SYMBOL_GPL(nf_nat_alloc_null_binding); | |
479 | ||
5b1158e9 JK |
480 | /* Do packet manipulations according to nf_nat_setup_info. */ |
481 | unsigned int nf_nat_packet(struct nf_conn *ct, | |
482 | enum ip_conntrack_info ctinfo, | |
483 | unsigned int hooknum, | |
3db05fea | 484 | struct sk_buff *skb) |
5b1158e9 | 485 | { |
c7232c99 PM |
486 | const struct nf_nat_l3proto *l3proto; |
487 | const struct nf_nat_l4proto *l4proto; | |
5b1158e9 JK |
488 | enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); |
489 | unsigned long statusbit; | |
490 | enum nf_nat_manip_type mtype = HOOK2MANIP(hooknum); | |
491 | ||
cbc9f2f4 | 492 | if (mtype == NF_NAT_MANIP_SRC) |
5b1158e9 JK |
493 | statusbit = IPS_SRC_NAT; |
494 | else | |
495 | statusbit = IPS_DST_NAT; | |
496 | ||
497 | /* Invert if this is reply dir. */ | |
498 | if (dir == IP_CT_DIR_REPLY) | |
499 | statusbit ^= IPS_NAT_MASK; | |
500 | ||
501 | /* Non-atomic: these bits don't change. */ | |
502 | if (ct->status & statusbit) { | |
503 | struct nf_conntrack_tuple target; | |
504 | ||
505 | /* We are aiming to look like inverse of other direction. */ | |
506 | nf_ct_invert_tuplepr(&target, &ct->tuplehash[!dir].tuple); | |
507 | ||
c7232c99 PM |
508 | l3proto = __nf_nat_l3proto_find(target.src.l3num); |
509 | l4proto = __nf_nat_l4proto_find(target.src.l3num, | |
510 | target.dst.protonum); | |
511 | if (!l3proto->manip_pkt(skb, 0, l4proto, &target, mtype)) | |
5b1158e9 JK |
512 | return NF_DROP; |
513 | } | |
514 | return NF_ACCEPT; | |
515 | } | |
516 | EXPORT_SYMBOL_GPL(nf_nat_packet); | |
517 | ||
c7232c99 PM |
518 | struct nf_nat_proto_clean { |
519 | u8 l3proto; | |
520 | u8 l4proto; | |
c7232c99 PM |
521 | }; |
522 | ||
c2d421e1 FW |
523 | /* kill conntracks with affected NAT section */ |
524 | static int nf_nat_proto_remove(struct nf_conn *i, void *data) | |
5b1158e9 | 525 | { |
c7232c99 PM |
526 | const struct nf_nat_proto_clean *clean = data; |
527 | struct nf_conn_nat *nat = nfct_nat(i); | |
5b1158e9 | 528 | |
c7232c99 | 529 | if (!nat) |
5b1158e9 | 530 | return 0; |
c2d421e1 | 531 | |
c7232c99 PM |
532 | if ((clean->l3proto && nf_ct_l3num(i) != clean->l3proto) || |
533 | (clean->l4proto && nf_ct_protonum(i) != clean->l4proto)) | |
5b1158e9 JK |
534 | return 0; |
535 | ||
c2d421e1 | 536 | return i->status & IPS_NAT_MASK ? 1 : 0; |
c7232c99 | 537 | } |
5b1158e9 | 538 | |
945b2b2d FW |
539 | static int nf_nat_proto_clean(struct nf_conn *ct, void *data) |
540 | { | |
541 | struct nf_conn_nat *nat = nfct_nat(ct); | |
542 | ||
543 | if (nf_nat_proto_remove(ct, data)) | |
544 | return 1; | |
545 | ||
546 | if (!nat || !nat->ct) | |
547 | return 0; | |
548 | ||
549 | /* This netns is being destroyed, and conntrack has nat null binding. | |
550 | * Remove it from bysource hash, as the table will be freed soon. | |
551 | * | |
552 | * Else, when the conntrack is destoyed, nf_nat_cleanup_conntrack() | |
553 | * will delete entry from already-freed table. | |
554 | */ | |
555 | if (!del_timer(&ct->timeout)) | |
556 | return 1; | |
557 | ||
558 | spin_lock_bh(&nf_nat_lock); | |
559 | hlist_del_rcu(&nat->bysource); | |
560 | ct->status &= ~IPS_NAT_DONE_MASK; | |
561 | nat->ct = NULL; | |
562 | spin_unlock_bh(&nf_nat_lock); | |
563 | ||
564 | add_timer(&ct->timeout); | |
565 | ||
566 | /* don't delete conntrack. Although that would make things a lot | |
567 | * simpler, we'd end up flushing all conntracks on nat rmmod. | |
568 | */ | |
569 | return 0; | |
570 | } | |
571 | ||
c7232c99 PM |
572 | static void nf_nat_l4proto_clean(u8 l3proto, u8 l4proto) |
573 | { | |
574 | struct nf_nat_proto_clean clean = { | |
575 | .l3proto = l3proto, | |
576 | .l4proto = l4proto, | |
577 | }; | |
578 | struct net *net; | |
579 | ||
580 | rtnl_lock(); | |
c7232c99 | 581 | for_each_net(net) |
c655bc68 | 582 | nf_ct_iterate_cleanup(net, nf_nat_proto_remove, &clean, 0, 0); |
c7232c99 PM |
583 | rtnl_unlock(); |
584 | } | |
5b1158e9 | 585 | |
c7232c99 PM |
586 | static void nf_nat_l3proto_clean(u8 l3proto) |
587 | { | |
588 | struct nf_nat_proto_clean clean = { | |
589 | .l3proto = l3proto, | |
590 | }; | |
591 | struct net *net; | |
592 | ||
593 | rtnl_lock(); | |
5b1158e9 | 594 | |
c7232c99 | 595 | for_each_net(net) |
c655bc68 | 596 | nf_ct_iterate_cleanup(net, nf_nat_proto_remove, &clean, 0, 0); |
c7232c99 | 597 | rtnl_unlock(); |
5b1158e9 | 598 | } |
5b1158e9 JK |
599 | |
600 | /* Protocol registration. */ | |
c7232c99 | 601 | int nf_nat_l4proto_register(u8 l3proto, const struct nf_nat_l4proto *l4proto) |
5b1158e9 | 602 | { |
c7232c99 PM |
603 | const struct nf_nat_l4proto **l4protos; |
604 | unsigned int i; | |
5b1158e9 JK |
605 | int ret = 0; |
606 | ||
c7232c99 PM |
607 | mutex_lock(&nf_nat_proto_mutex); |
608 | if (nf_nat_l4protos[l3proto] == NULL) { | |
609 | l4protos = kmalloc(IPPROTO_MAX * sizeof(struct nf_nat_l4proto *), | |
610 | GFP_KERNEL); | |
611 | if (l4protos == NULL) { | |
612 | ret = -ENOMEM; | |
613 | goto out; | |
614 | } | |
615 | ||
616 | for (i = 0; i < IPPROTO_MAX; i++) | |
617 | RCU_INIT_POINTER(l4protos[i], &nf_nat_l4proto_unknown); | |
618 | ||
619 | /* Before making proto_array visible to lockless readers, | |
620 | * we must make sure its content is committed to memory. | |
621 | */ | |
622 | smp_wmb(); | |
623 | ||
624 | nf_nat_l4protos[l3proto] = l4protos; | |
625 | } | |
626 | ||
eb733162 | 627 | if (rcu_dereference_protected( |
c7232c99 PM |
628 | nf_nat_l4protos[l3proto][l4proto->l4proto], |
629 | lockdep_is_held(&nf_nat_proto_mutex) | |
630 | ) != &nf_nat_l4proto_unknown) { | |
5b1158e9 JK |
631 | ret = -EBUSY; |
632 | goto out; | |
633 | } | |
c7232c99 | 634 | RCU_INIT_POINTER(nf_nat_l4protos[l3proto][l4proto->l4proto], l4proto); |
5b1158e9 | 635 | out: |
c7232c99 | 636 | mutex_unlock(&nf_nat_proto_mutex); |
5b1158e9 JK |
637 | return ret; |
638 | } | |
c7232c99 | 639 | EXPORT_SYMBOL_GPL(nf_nat_l4proto_register); |
5b1158e9 | 640 | |
25985edc | 641 | /* No one stores the protocol anywhere; simply delete it. */ |
c7232c99 | 642 | void nf_nat_l4proto_unregister(u8 l3proto, const struct nf_nat_l4proto *l4proto) |
5b1158e9 | 643 | { |
c7232c99 PM |
644 | mutex_lock(&nf_nat_proto_mutex); |
645 | RCU_INIT_POINTER(nf_nat_l4protos[l3proto][l4proto->l4proto], | |
646 | &nf_nat_l4proto_unknown); | |
647 | mutex_unlock(&nf_nat_proto_mutex); | |
e22a0548 | 648 | synchronize_rcu(); |
c7232c99 PM |
649 | |
650 | nf_nat_l4proto_clean(l3proto, l4proto->l4proto); | |
5b1158e9 | 651 | } |
c7232c99 PM |
652 | EXPORT_SYMBOL_GPL(nf_nat_l4proto_unregister); |
653 | ||
654 | int nf_nat_l3proto_register(const struct nf_nat_l3proto *l3proto) | |
655 | { | |
656 | int err; | |
657 | ||
658 | err = nf_ct_l3proto_try_module_get(l3proto->l3proto); | |
659 | if (err < 0) | |
660 | return err; | |
661 | ||
662 | mutex_lock(&nf_nat_proto_mutex); | |
663 | RCU_INIT_POINTER(nf_nat_l4protos[l3proto->l3proto][IPPROTO_TCP], | |
664 | &nf_nat_l4proto_tcp); | |
665 | RCU_INIT_POINTER(nf_nat_l4protos[l3proto->l3proto][IPPROTO_UDP], | |
666 | &nf_nat_l4proto_udp); | |
667 | mutex_unlock(&nf_nat_proto_mutex); | |
668 | ||
669 | RCU_INIT_POINTER(nf_nat_l3protos[l3proto->l3proto], l3proto); | |
670 | return 0; | |
671 | } | |
672 | EXPORT_SYMBOL_GPL(nf_nat_l3proto_register); | |
673 | ||
674 | void nf_nat_l3proto_unregister(const struct nf_nat_l3proto *l3proto) | |
675 | { | |
676 | mutex_lock(&nf_nat_proto_mutex); | |
677 | RCU_INIT_POINTER(nf_nat_l3protos[l3proto->l3proto], NULL); | |
678 | mutex_unlock(&nf_nat_proto_mutex); | |
679 | synchronize_rcu(); | |
680 | ||
681 | nf_nat_l3proto_clean(l3proto->l3proto); | |
682 | nf_ct_l3proto_module_put(l3proto->l3proto); | |
683 | } | |
684 | EXPORT_SYMBOL_GPL(nf_nat_l3proto_unregister); | |
5b1158e9 | 685 | |
25985edc | 686 | /* No one using conntrack by the time this called. */ |
d8a0509a YK |
687 | static void nf_nat_cleanup_conntrack(struct nf_conn *ct) |
688 | { | |
689 | struct nf_conn_nat *nat = nf_ct_ext_find(ct, NF_CT_EXT_NAT); | |
690 | ||
b6b84d4a | 691 | if (nat == NULL || nat->ct == NULL) |
d8a0509a YK |
692 | return; |
693 | ||
41a7cab6 | 694 | NF_CT_ASSERT(nat->ct->status & IPS_SRC_NAT_DONE); |
d8a0509a | 695 | |
02502f62 | 696 | spin_lock_bh(&nf_nat_lock); |
4d354c57 | 697 | hlist_del_rcu(&nat->bysource); |
02502f62 | 698 | spin_unlock_bh(&nf_nat_lock); |
d8a0509a YK |
699 | } |
700 | ||
86577c66 | 701 | static void nf_nat_move_storage(void *new, void *old) |
2d59e5ca | 702 | { |
86577c66 PM |
703 | struct nf_conn_nat *new_nat = new; |
704 | struct nf_conn_nat *old_nat = old; | |
b6b84d4a | 705 | struct nf_conn *ct = old_nat->ct; |
2d59e5ca | 706 | |
41a7cab6 | 707 | if (!ct || !(ct->status & IPS_SRC_NAT_DONE)) |
2d59e5ca YK |
708 | return; |
709 | ||
02502f62 | 710 | spin_lock_bh(&nf_nat_lock); |
68b80f11 | 711 | hlist_replace_rcu(&old_nat->bysource, &new_nat->bysource); |
02502f62 | 712 | spin_unlock_bh(&nf_nat_lock); |
2d59e5ca YK |
713 | } |
714 | ||
61eb3107 | 715 | static struct nf_ct_ext_type nat_extend __read_mostly = { |
d8a0509a YK |
716 | .len = sizeof(struct nf_conn_nat), |
717 | .align = __alignof__(struct nf_conn_nat), | |
718 | .destroy = nf_nat_cleanup_conntrack, | |
719 | .move = nf_nat_move_storage, | |
720 | .id = NF_CT_EXT_NAT, | |
721 | .flags = NF_CT_EXT_F_PREALLOC, | |
2d59e5ca YK |
722 | }; |
723 | ||
24de3d37 | 724 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
e6a7d3c0 PNA |
725 | |
726 | #include <linux/netfilter/nfnetlink.h> | |
727 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
728 | ||
729 | static const struct nla_policy protonat_nla_policy[CTA_PROTONAT_MAX+1] = { | |
730 | [CTA_PROTONAT_PORT_MIN] = { .type = NLA_U16 }, | |
731 | [CTA_PROTONAT_PORT_MAX] = { .type = NLA_U16 }, | |
732 | }; | |
733 | ||
734 | static int nfnetlink_parse_nat_proto(struct nlattr *attr, | |
735 | const struct nf_conn *ct, | |
c7232c99 | 736 | struct nf_nat_range *range) |
e6a7d3c0 PNA |
737 | { |
738 | struct nlattr *tb[CTA_PROTONAT_MAX+1]; | |
c7232c99 | 739 | const struct nf_nat_l4proto *l4proto; |
e6a7d3c0 PNA |
740 | int err; |
741 | ||
742 | err = nla_parse_nested(tb, CTA_PROTONAT_MAX, attr, protonat_nla_policy); | |
743 | if (err < 0) | |
744 | return err; | |
745 | ||
c7232c99 PM |
746 | l4proto = __nf_nat_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
747 | if (l4proto->nlattr_to_range) | |
748 | err = l4proto->nlattr_to_range(tb, range); | |
749 | ||
e6a7d3c0 PNA |
750 | return err; |
751 | } | |
752 | ||
753 | static const struct nla_policy nat_nla_policy[CTA_NAT_MAX+1] = { | |
c7232c99 PM |
754 | [CTA_NAT_V4_MINIP] = { .type = NLA_U32 }, |
755 | [CTA_NAT_V4_MAXIP] = { .type = NLA_U32 }, | |
58a317f1 PM |
756 | [CTA_NAT_V6_MINIP] = { .len = sizeof(struct in6_addr) }, |
757 | [CTA_NAT_V6_MAXIP] = { .len = sizeof(struct in6_addr) }, | |
329fb58a | 758 | [CTA_NAT_PROTO] = { .type = NLA_NESTED }, |
e6a7d3c0 PNA |
759 | }; |
760 | ||
761 | static int | |
39938324 | 762 | nfnetlink_parse_nat(const struct nlattr *nat, |
0eba801b PNA |
763 | const struct nf_conn *ct, struct nf_nat_range *range, |
764 | const struct nf_nat_l3proto *l3proto) | |
e6a7d3c0 PNA |
765 | { |
766 | struct nlattr *tb[CTA_NAT_MAX+1]; | |
767 | int err; | |
768 | ||
769 | memset(range, 0, sizeof(*range)); | |
770 | ||
771 | err = nla_parse_nested(tb, CTA_NAT_MAX, nat, nat_nla_policy); | |
772 | if (err < 0) | |
773 | return err; | |
774 | ||
c7232c99 PM |
775 | err = l3proto->nlattr_to_range(tb, range); |
776 | if (err < 0) | |
0eba801b | 777 | return err; |
e6a7d3c0 PNA |
778 | |
779 | if (!tb[CTA_NAT_PROTO]) | |
0eba801b | 780 | return 0; |
e6a7d3c0 | 781 | |
0eba801b | 782 | return nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO], ct, range); |
e6a7d3c0 PNA |
783 | } |
784 | ||
0eba801b | 785 | /* This function is called under rcu_read_lock() */ |
e6a7d3c0 PNA |
786 | static int |
787 | nfnetlink_parse_nat_setup(struct nf_conn *ct, | |
788 | enum nf_nat_manip_type manip, | |
39938324 | 789 | const struct nlattr *attr) |
e6a7d3c0 | 790 | { |
c7232c99 | 791 | struct nf_nat_range range; |
0eba801b | 792 | const struct nf_nat_l3proto *l3proto; |
c7232c99 | 793 | int err; |
e6a7d3c0 | 794 | |
0eba801b PNA |
795 | /* Should not happen, restricted to creating new conntracks |
796 | * via ctnetlink. | |
797 | */ | |
798 | if (WARN_ON_ONCE(nf_nat_initialized(ct, manip))) | |
799 | return -EEXIST; | |
800 | ||
801 | /* Make sure that L3 NAT is there by when we call nf_nat_setup_info to | |
802 | * attach the null binding, otherwise this may oops. | |
803 | */ | |
804 | l3proto = __nf_nat_l3proto_find(nf_ct_l3num(ct)); | |
805 | if (l3proto == NULL) | |
806 | return -EAGAIN; | |
807 | ||
808 | /* No NAT information has been passed, allocate the null-binding */ | |
809 | if (attr == NULL) | |
810 | return __nf_nat_alloc_null_binding(ct, manip); | |
811 | ||
812 | err = nfnetlink_parse_nat(attr, ct, &range, l3proto); | |
c7232c99 PM |
813 | if (err < 0) |
814 | return err; | |
e6a7d3c0 PNA |
815 | |
816 | return nf_nat_setup_info(ct, &range, manip); | |
817 | } | |
818 | #else | |
819 | static int | |
820 | nfnetlink_parse_nat_setup(struct nf_conn *ct, | |
821 | enum nf_nat_manip_type manip, | |
39938324 | 822 | const struct nlattr *attr) |
e6a7d3c0 PNA |
823 | { |
824 | return -EOPNOTSUPP; | |
825 | } | |
826 | #endif | |
827 | ||
0c4c9288 AD |
828 | static void __net_exit nf_nat_net_exit(struct net *net) |
829 | { | |
c7232c99 PM |
830 | struct nf_nat_proto_clean clean = {}; |
831 | ||
945b2b2d | 832 | nf_ct_iterate_cleanup(net, nf_nat_proto_clean, &clean, 0, 0); |
0c4c9288 AD |
833 | } |
834 | ||
835 | static struct pernet_operations nf_nat_net_ops = { | |
0c4c9288 AD |
836 | .exit = nf_nat_net_exit, |
837 | }; | |
838 | ||
544d5c7d PNA |
839 | static struct nf_ct_helper_expectfn follow_master_nat = { |
840 | .name = "nat-follow-master", | |
841 | .expectfn = nf_nat_follow_master, | |
842 | }; | |
843 | ||
5b1158e9 JK |
844 | static int __init nf_nat_init(void) |
845 | { | |
2d59e5ca YK |
846 | int ret; |
847 | ||
a76ae1c8 FW |
848 | /* Leave them the same for the moment. */ |
849 | nf_nat_htable_size = nf_conntrack_htable_size; | |
850 | ||
851 | nf_nat_bysource = nf_ct_alloc_hashtable(&nf_nat_htable_size, 0); | |
852 | if (!nf_nat_bysource) | |
853 | return -ENOMEM; | |
854 | ||
2d59e5ca YK |
855 | ret = nf_ct_extend_register(&nat_extend); |
856 | if (ret < 0) { | |
a76ae1c8 | 857 | nf_ct_free_hashtable(nf_nat_bysource, nf_nat_htable_size); |
2d59e5ca YK |
858 | printk(KERN_ERR "nf_nat_core: Unable to register extension\n"); |
859 | return ret; | |
860 | } | |
5b1158e9 | 861 | |
0c4c9288 AD |
862 | ret = register_pernet_subsys(&nf_nat_net_ops); |
863 | if (ret < 0) | |
2d59e5ca | 864 | goto cleanup_extend; |
5b1158e9 | 865 | |
c7232c99 | 866 | nf_ct_helper_expectfn_register(&follow_master_nat); |
5b1158e9 | 867 | |
5b1158e9 | 868 | /* Initialize fake conntrack so that NAT will skip it */ |
5bfddbd4 | 869 | nf_ct_untracked_status_or(IPS_NAT_DONE_MASK); |
5b1158e9 | 870 | |
e6a7d3c0 | 871 | BUG_ON(nfnetlink_parse_nat_setup_hook != NULL); |
a9b3cd7f | 872 | RCU_INIT_POINTER(nfnetlink_parse_nat_setup_hook, |
e6a7d3c0 | 873 | nfnetlink_parse_nat_setup); |
c7232c99 PM |
874 | #ifdef CONFIG_XFRM |
875 | BUG_ON(nf_nat_decode_session_hook != NULL); | |
876 | RCU_INIT_POINTER(nf_nat_decode_session_hook, __nf_nat_decode_session); | |
877 | #endif | |
5b1158e9 | 878 | return 0; |
2d59e5ca YK |
879 | |
880 | cleanup_extend: | |
a76ae1c8 | 881 | nf_ct_free_hashtable(nf_nat_bysource, nf_nat_htable_size); |
2d59e5ca YK |
882 | nf_ct_extend_unregister(&nat_extend); |
883 | return ret; | |
5b1158e9 JK |
884 | } |
885 | ||
5b1158e9 JK |
886 | static void __exit nf_nat_cleanup(void) |
887 | { | |
c7232c99 PM |
888 | unsigned int i; |
889 | ||
0c4c9288 | 890 | unregister_pernet_subsys(&nf_nat_net_ops); |
2d59e5ca | 891 | nf_ct_extend_unregister(&nat_extend); |
544d5c7d | 892 | nf_ct_helper_expectfn_unregister(&follow_master_nat); |
a9b3cd7f | 893 | RCU_INIT_POINTER(nfnetlink_parse_nat_setup_hook, NULL); |
c7232c99 PM |
894 | #ifdef CONFIG_XFRM |
895 | RCU_INIT_POINTER(nf_nat_decode_session_hook, NULL); | |
896 | #endif | |
897 | for (i = 0; i < NFPROTO_NUMPROTO; i++) | |
898 | kfree(nf_nat_l4protos[i]); | |
dd13b010 | 899 | synchronize_net(); |
a76ae1c8 | 900 | nf_ct_free_hashtable(nf_nat_bysource, nf_nat_htable_size); |
5b1158e9 JK |
901 | } |
902 | ||
903 | MODULE_LICENSE("GPL"); | |
904 | ||
905 | module_init(nf_nat_init); | |
906 | module_exit(nf_nat_cleanup); |