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ac2a6666 PNA |
1 | #include <linux/kernel.h> |
2 | #include <linux/init.h> | |
3 | #include <linux/module.h> | |
4 | #include <linux/netfilter.h> | |
5 | #include <linux/rhashtable.h> | |
6 | #include <linux/netdevice.h> | |
4f3780c0 FF |
7 | #include <net/ip.h> |
8 | #include <net/ip6_route.h> | |
c0ea1bcb | 9 | #include <net/netfilter/nf_tables.h> |
ac2a6666 PNA |
10 | #include <net/netfilter/nf_flow_table.h> |
11 | #include <net/netfilter/nf_conntrack.h> | |
12 | #include <net/netfilter/nf_conntrack_core.h> | |
13 | #include <net/netfilter/nf_conntrack_tuple.h> | |
14 | ||
15 | struct flow_offload_entry { | |
16 | struct flow_offload flow; | |
17 | struct nf_conn *ct; | |
18 | struct rcu_head rcu_head; | |
19 | }; | |
20 | ||
84453a90 FF |
21 | static DEFINE_MUTEX(flowtable_lock); |
22 | static LIST_HEAD(flowtables); | |
23 | ||
047b300e FF |
24 | static void |
25 | flow_offload_fill_dir(struct flow_offload *flow, struct nf_conn *ct, | |
26 | struct nf_flow_route *route, | |
27 | enum flow_offload_tuple_dir dir) | |
28 | { | |
29 | struct flow_offload_tuple *ft = &flow->tuplehash[dir].tuple; | |
30 | struct nf_conntrack_tuple *ctt = &ct->tuplehash[dir].tuple; | |
4f3780c0 | 31 | struct dst_entry *dst = route->tuple[dir].dst; |
047b300e FF |
32 | |
33 | ft->dir = dir; | |
34 | ||
35 | switch (ctt->src.l3num) { | |
36 | case NFPROTO_IPV4: | |
37 | ft->src_v4 = ctt->src.u3.in; | |
38 | ft->dst_v4 = ctt->dst.u3.in; | |
4f3780c0 | 39 | ft->mtu = ip_dst_mtu_maybe_forward(dst, true); |
047b300e FF |
40 | break; |
41 | case NFPROTO_IPV6: | |
42 | ft->src_v6 = ctt->src.u3.in6; | |
43 | ft->dst_v6 = ctt->dst.u3.in6; | |
4f3780c0 | 44 | ft->mtu = ip6_dst_mtu_forward(dst); |
047b300e FF |
45 | break; |
46 | } | |
47 | ||
48 | ft->l3proto = ctt->src.l3num; | |
49 | ft->l4proto = ctt->dst.protonum; | |
50 | ft->src_port = ctt->src.u.tcp.port; | |
51 | ft->dst_port = ctt->dst.u.tcp.port; | |
52 | ||
53 | ft->iifidx = route->tuple[dir].ifindex; | |
54 | ft->oifidx = route->tuple[!dir].ifindex; | |
4f3780c0 | 55 | ft->dst_cache = dst; |
047b300e FF |
56 | } |
57 | ||
ac2a6666 PNA |
58 | struct flow_offload * |
59 | flow_offload_alloc(struct nf_conn *ct, struct nf_flow_route *route) | |
60 | { | |
61 | struct flow_offload_entry *entry; | |
62 | struct flow_offload *flow; | |
63 | ||
64 | if (unlikely(nf_ct_is_dying(ct) || | |
65 | !atomic_inc_not_zero(&ct->ct_general.use))) | |
66 | return NULL; | |
67 | ||
68 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
69 | if (!entry) | |
70 | goto err_ct_refcnt; | |
71 | ||
72 | flow = &entry->flow; | |
73 | ||
74 | if (!dst_hold_safe(route->tuple[FLOW_OFFLOAD_DIR_ORIGINAL].dst)) | |
75 | goto err_dst_cache_original; | |
76 | ||
77 | if (!dst_hold_safe(route->tuple[FLOW_OFFLOAD_DIR_REPLY].dst)) | |
78 | goto err_dst_cache_reply; | |
79 | ||
80 | entry->ct = ct; | |
81 | ||
047b300e FF |
82 | flow_offload_fill_dir(flow, ct, route, FLOW_OFFLOAD_DIR_ORIGINAL); |
83 | flow_offload_fill_dir(flow, ct, route, FLOW_OFFLOAD_DIR_REPLY); | |
ac2a6666 PNA |
84 | |
85 | if (ct->status & IPS_SRC_NAT) | |
86 | flow->flags |= FLOW_OFFLOAD_SNAT; | |
df1e2025 | 87 | if (ct->status & IPS_DST_NAT) |
ac2a6666 PNA |
88 | flow->flags |= FLOW_OFFLOAD_DNAT; |
89 | ||
90 | return flow; | |
91 | ||
92 | err_dst_cache_reply: | |
93 | dst_release(route->tuple[FLOW_OFFLOAD_DIR_ORIGINAL].dst); | |
94 | err_dst_cache_original: | |
95 | kfree(entry); | |
96 | err_ct_refcnt: | |
97 | nf_ct_put(ct); | |
98 | ||
99 | return NULL; | |
100 | } | |
101 | EXPORT_SYMBOL_GPL(flow_offload_alloc); | |
102 | ||
da5984e5 FF |
103 | static void flow_offload_fixup_tcp(struct ip_ct_tcp *tcp) |
104 | { | |
105 | tcp->state = TCP_CONNTRACK_ESTABLISHED; | |
106 | tcp->seen[0].td_maxwin = 0; | |
107 | tcp->seen[1].td_maxwin = 0; | |
108 | } | |
109 | ||
e97d9404 FW |
110 | #define NF_FLOWTABLE_TCP_PICKUP_TIMEOUT (120 * HZ) |
111 | #define NF_FLOWTABLE_UDP_PICKUP_TIMEOUT (30 * HZ) | |
112 | ||
da5984e5 FF |
113 | static void flow_offload_fixup_ct_state(struct nf_conn *ct) |
114 | { | |
115 | const struct nf_conntrack_l4proto *l4proto; | |
da5984e5 FF |
116 | unsigned int timeout; |
117 | int l4num; | |
118 | ||
119 | l4num = nf_ct_protonum(ct); | |
120 | if (l4num == IPPROTO_TCP) | |
121 | flow_offload_fixup_tcp(&ct->proto.tcp); | |
122 | ||
dd2934a9 | 123 | l4proto = __nf_ct_l4proto_find(l4num); |
da5984e5 FF |
124 | if (!l4proto) |
125 | return; | |
126 | ||
da5984e5 | 127 | if (l4num == IPPROTO_TCP) |
e97d9404 | 128 | timeout = NF_FLOWTABLE_TCP_PICKUP_TIMEOUT; |
da5984e5 | 129 | else if (l4num == IPPROTO_UDP) |
e97d9404 | 130 | timeout = NF_FLOWTABLE_UDP_PICKUP_TIMEOUT; |
da5984e5 FF |
131 | else |
132 | return; | |
133 | ||
134 | ct->timeout = nfct_time_stamp + timeout; | |
135 | } | |
136 | ||
ac2a6666 PNA |
137 | void flow_offload_free(struct flow_offload *flow) |
138 | { | |
139 | struct flow_offload_entry *e; | |
140 | ||
141 | dst_release(flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.dst_cache); | |
142 | dst_release(flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst_cache); | |
143 | e = container_of(flow, struct flow_offload_entry, flow); | |
da5984e5 FF |
144 | if (flow->flags & FLOW_OFFLOAD_DYING) |
145 | nf_ct_delete(e->ct, 0, 0); | |
0ff90b6c FF |
146 | nf_ct_put(e->ct); |
147 | kfree_rcu(e, rcu_head); | |
ac2a6666 PNA |
148 | } |
149 | EXPORT_SYMBOL_GPL(flow_offload_free); | |
150 | ||
a268de77 FF |
151 | static u32 flow_offload_hash(const void *data, u32 len, u32 seed) |
152 | { | |
153 | const struct flow_offload_tuple *tuple = data; | |
154 | ||
155 | return jhash(tuple, offsetof(struct flow_offload_tuple, dir), seed); | |
156 | } | |
157 | ||
158 | static u32 flow_offload_hash_obj(const void *data, u32 len, u32 seed) | |
159 | { | |
160 | const struct flow_offload_tuple_rhash *tuplehash = data; | |
161 | ||
162 | return jhash(&tuplehash->tuple, offsetof(struct flow_offload_tuple, dir), seed); | |
163 | } | |
164 | ||
165 | static int flow_offload_hash_cmp(struct rhashtable_compare_arg *arg, | |
166 | const void *ptr) | |
167 | { | |
168 | const struct flow_offload_tuple *tuple = arg->key; | |
169 | const struct flow_offload_tuple_rhash *x = ptr; | |
170 | ||
171 | if (memcmp(&x->tuple, tuple, offsetof(struct flow_offload_tuple, dir))) | |
172 | return 1; | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | static const struct rhashtable_params nf_flow_offload_rhash_params = { | |
178 | .head_offset = offsetof(struct flow_offload_tuple_rhash, node), | |
179 | .hashfn = flow_offload_hash, | |
180 | .obj_hashfn = flow_offload_hash_obj, | |
181 | .obj_cmpfn = flow_offload_hash_cmp, | |
182 | .automatic_shrinking = true, | |
183 | }; | |
184 | ||
ac2a6666 PNA |
185 | int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload *flow) |
186 | { | |
187 | flow->timeout = (u32)jiffies; | |
188 | ||
189 | rhashtable_insert_fast(&flow_table->rhashtable, | |
190 | &flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].node, | |
a268de77 | 191 | nf_flow_offload_rhash_params); |
ac2a6666 PNA |
192 | rhashtable_insert_fast(&flow_table->rhashtable, |
193 | &flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].node, | |
a268de77 | 194 | nf_flow_offload_rhash_params); |
ac2a6666 PNA |
195 | return 0; |
196 | } | |
197 | EXPORT_SYMBOL_GPL(flow_offload_add); | |
198 | ||
0ff90b6c FF |
199 | static void flow_offload_del(struct nf_flowtable *flow_table, |
200 | struct flow_offload *flow) | |
ac2a6666 | 201 | { |
da5984e5 FF |
202 | struct flow_offload_entry *e; |
203 | ||
ac2a6666 PNA |
204 | rhashtable_remove_fast(&flow_table->rhashtable, |
205 | &flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].node, | |
a268de77 | 206 | nf_flow_offload_rhash_params); |
ac2a6666 PNA |
207 | rhashtable_remove_fast(&flow_table->rhashtable, |
208 | &flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].node, | |
a268de77 | 209 | nf_flow_offload_rhash_params); |
ac2a6666 | 210 | |
da5984e5 FF |
211 | e = container_of(flow, struct flow_offload_entry, flow); |
212 | clear_bit(IPS_OFFLOAD_BIT, &e->ct->status); | |
213 | ||
0ff90b6c | 214 | flow_offload_free(flow); |
ac2a6666 | 215 | } |
ac2a6666 | 216 | |
59c466dd FF |
217 | void flow_offload_teardown(struct flow_offload *flow) |
218 | { | |
da5984e5 FF |
219 | struct flow_offload_entry *e; |
220 | ||
59c466dd | 221 | flow->flags |= FLOW_OFFLOAD_TEARDOWN; |
da5984e5 FF |
222 | |
223 | e = container_of(flow, struct flow_offload_entry, flow); | |
224 | flow_offload_fixup_ct_state(e->ct); | |
59c466dd FF |
225 | } |
226 | EXPORT_SYMBOL_GPL(flow_offload_teardown); | |
227 | ||
ac2a6666 PNA |
228 | struct flow_offload_tuple_rhash * |
229 | flow_offload_lookup(struct nf_flowtable *flow_table, | |
230 | struct flow_offload_tuple *tuple) | |
231 | { | |
ba03137f FF |
232 | struct flow_offload_tuple_rhash *tuplehash; |
233 | struct flow_offload *flow; | |
234 | int dir; | |
235 | ||
a2d88182 TY |
236 | tuplehash = rhashtable_lookup(&flow_table->rhashtable, tuple, |
237 | nf_flow_offload_rhash_params); | |
ba03137f FF |
238 | if (!tuplehash) |
239 | return NULL; | |
240 | ||
241 | dir = tuplehash->tuple.dir; | |
242 | flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]); | |
243 | if (flow->flags & (FLOW_OFFLOAD_DYING | FLOW_OFFLOAD_TEARDOWN)) | |
244 | return NULL; | |
245 | ||
246 | return tuplehash; | |
ac2a6666 PNA |
247 | } |
248 | EXPORT_SYMBOL_GPL(flow_offload_lookup); | |
249 | ||
ac2a6666 PNA |
250 | int nf_flow_table_iterate(struct nf_flowtable *flow_table, |
251 | void (*iter)(struct flow_offload *flow, void *data), | |
252 | void *data) | |
253 | { | |
254 | struct flow_offload_tuple_rhash *tuplehash; | |
255 | struct rhashtable_iter hti; | |
256 | struct flow_offload *flow; | |
0de22baa | 257 | int err = 0; |
ac2a6666 | 258 | |
0de22baa | 259 | rhashtable_walk_enter(&flow_table->rhashtable, &hti); |
ac2a6666 PNA |
260 | rhashtable_walk_start(&hti); |
261 | ||
262 | while ((tuplehash = rhashtable_walk_next(&hti))) { | |
263 | if (IS_ERR(tuplehash)) { | |
0de22baa TY |
264 | if (PTR_ERR(tuplehash) != -EAGAIN) { |
265 | err = PTR_ERR(tuplehash); | |
266 | break; | |
267 | } | |
ac2a6666 PNA |
268 | continue; |
269 | } | |
270 | if (tuplehash->tuple.dir) | |
271 | continue; | |
272 | ||
273 | flow = container_of(tuplehash, struct flow_offload, tuplehash[0]); | |
274 | ||
275 | iter(flow, data); | |
276 | } | |
ac2a6666 PNA |
277 | rhashtable_walk_stop(&hti); |
278 | rhashtable_walk_exit(&hti); | |
279 | ||
280 | return err; | |
281 | } | |
282 | EXPORT_SYMBOL_GPL(nf_flow_table_iterate); | |
283 | ||
284 | static inline bool nf_flow_has_expired(const struct flow_offload *flow) | |
285 | { | |
286 | return (__s32)(flow->timeout - (u32)jiffies) <= 0; | |
287 | } | |
288 | ||
0de22baa | 289 | static void nf_flow_offload_gc_step(struct nf_flowtable *flow_table) |
ac2a6666 PNA |
290 | { |
291 | struct flow_offload_tuple_rhash *tuplehash; | |
ac2a6666 PNA |
292 | struct rhashtable_iter hti; |
293 | struct flow_offload *flow; | |
ac2a6666 | 294 | |
0de22baa | 295 | rhashtable_walk_enter(&flow_table->rhashtable, &hti); |
ac2a6666 PNA |
296 | rhashtable_walk_start(&hti); |
297 | ||
298 | while ((tuplehash = rhashtable_walk_next(&hti))) { | |
299 | if (IS_ERR(tuplehash)) { | |
0de22baa TY |
300 | if (PTR_ERR(tuplehash) != -EAGAIN) |
301 | break; | |
ac2a6666 PNA |
302 | continue; |
303 | } | |
304 | if (tuplehash->tuple.dir) | |
305 | continue; | |
306 | ||
307 | flow = container_of(tuplehash, struct flow_offload, tuplehash[0]); | |
308 | ||
309 | if (nf_flow_has_expired(flow) || | |
59c466dd FF |
310 | (flow->flags & (FLOW_OFFLOAD_DYING | |
311 | FLOW_OFFLOAD_TEARDOWN))) | |
ac2a6666 | 312 | flow_offload_del(flow_table, flow); |
ac2a6666 | 313 | } |
ac2a6666 PNA |
314 | rhashtable_walk_stop(&hti); |
315 | rhashtable_walk_exit(&hti); | |
b408c5b0 PNA |
316 | } |
317 | ||
a268de77 | 318 | static void nf_flow_offload_work_gc(struct work_struct *work) |
b408c5b0 PNA |
319 | { |
320 | struct nf_flowtable *flow_table; | |
321 | ||
322 | flow_table = container_of(work, struct nf_flowtable, gc_work.work); | |
323 | nf_flow_offload_gc_step(flow_table); | |
ac2a6666 PNA |
324 | queue_delayed_work(system_power_efficient_wq, &flow_table->gc_work, HZ); |
325 | } | |
ac2a6666 PNA |
326 | |
327 | static int nf_flow_nat_port_tcp(struct sk_buff *skb, unsigned int thoff, | |
328 | __be16 port, __be16 new_port) | |
329 | { | |
330 | struct tcphdr *tcph; | |
331 | ||
332 | if (!pskb_may_pull(skb, thoff + sizeof(*tcph)) || | |
333 | skb_try_make_writable(skb, thoff + sizeof(*tcph))) | |
334 | return -1; | |
335 | ||
336 | tcph = (void *)(skb_network_header(skb) + thoff); | |
337 | inet_proto_csum_replace2(&tcph->check, skb, port, new_port, true); | |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
342 | static int nf_flow_nat_port_udp(struct sk_buff *skb, unsigned int thoff, | |
343 | __be16 port, __be16 new_port) | |
344 | { | |
345 | struct udphdr *udph; | |
346 | ||
347 | if (!pskb_may_pull(skb, thoff + sizeof(*udph)) || | |
348 | skb_try_make_writable(skb, thoff + sizeof(*udph))) | |
349 | return -1; | |
350 | ||
351 | udph = (void *)(skb_network_header(skb) + thoff); | |
352 | if (udph->check || skb->ip_summed == CHECKSUM_PARTIAL) { | |
353 | inet_proto_csum_replace2(&udph->check, skb, port, | |
354 | new_port, true); | |
355 | if (!udph->check) | |
356 | udph->check = CSUM_MANGLED_0; | |
357 | } | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
362 | static int nf_flow_nat_port(struct sk_buff *skb, unsigned int thoff, | |
363 | u8 protocol, __be16 port, __be16 new_port) | |
364 | { | |
365 | switch (protocol) { | |
366 | case IPPROTO_TCP: | |
367 | if (nf_flow_nat_port_tcp(skb, thoff, port, new_port) < 0) | |
368 | return NF_DROP; | |
369 | break; | |
370 | case IPPROTO_UDP: | |
371 | if (nf_flow_nat_port_udp(skb, thoff, port, new_port) < 0) | |
372 | return NF_DROP; | |
373 | break; | |
374 | } | |
375 | ||
376 | return 0; | |
377 | } | |
378 | ||
379 | int nf_flow_snat_port(const struct flow_offload *flow, | |
380 | struct sk_buff *skb, unsigned int thoff, | |
381 | u8 protocol, enum flow_offload_tuple_dir dir) | |
382 | { | |
383 | struct flow_ports *hdr; | |
384 | __be16 port, new_port; | |
385 | ||
386 | if (!pskb_may_pull(skb, thoff + sizeof(*hdr)) || | |
387 | skb_try_make_writable(skb, thoff + sizeof(*hdr))) | |
388 | return -1; | |
389 | ||
390 | hdr = (void *)(skb_network_header(skb) + thoff); | |
391 | ||
392 | switch (dir) { | |
393 | case FLOW_OFFLOAD_DIR_ORIGINAL: | |
394 | port = hdr->source; | |
395 | new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst_port; | |
396 | hdr->source = new_port; | |
397 | break; | |
398 | case FLOW_OFFLOAD_DIR_REPLY: | |
399 | port = hdr->dest; | |
400 | new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.src_port; | |
401 | hdr->dest = new_port; | |
402 | break; | |
403 | default: | |
404 | return -1; | |
405 | } | |
406 | ||
407 | return nf_flow_nat_port(skb, thoff, protocol, port, new_port); | |
408 | } | |
409 | EXPORT_SYMBOL_GPL(nf_flow_snat_port); | |
410 | ||
411 | int nf_flow_dnat_port(const struct flow_offload *flow, | |
412 | struct sk_buff *skb, unsigned int thoff, | |
413 | u8 protocol, enum flow_offload_tuple_dir dir) | |
414 | { | |
415 | struct flow_ports *hdr; | |
416 | __be16 port, new_port; | |
417 | ||
418 | if (!pskb_may_pull(skb, thoff + sizeof(*hdr)) || | |
419 | skb_try_make_writable(skb, thoff + sizeof(*hdr))) | |
420 | return -1; | |
421 | ||
422 | hdr = (void *)(skb_network_header(skb) + thoff); | |
423 | ||
424 | switch (dir) { | |
425 | case FLOW_OFFLOAD_DIR_ORIGINAL: | |
426 | port = hdr->dest; | |
427 | new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.src_port; | |
428 | hdr->dest = new_port; | |
429 | break; | |
430 | case FLOW_OFFLOAD_DIR_REPLY: | |
431 | port = hdr->source; | |
432 | new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.dst_port; | |
433 | hdr->source = new_port; | |
434 | break; | |
435 | default: | |
436 | return -1; | |
437 | } | |
438 | ||
439 | return nf_flow_nat_port(skb, thoff, protocol, port, new_port); | |
440 | } | |
441 | EXPORT_SYMBOL_GPL(nf_flow_dnat_port); | |
442 | ||
a268de77 FF |
443 | int nf_flow_table_init(struct nf_flowtable *flowtable) |
444 | { | |
445 | int err; | |
446 | ||
447 | INIT_DEFERRABLE_WORK(&flowtable->gc_work, nf_flow_offload_work_gc); | |
448 | ||
449 | err = rhashtable_init(&flowtable->rhashtable, | |
450 | &nf_flow_offload_rhash_params); | |
451 | if (err < 0) | |
452 | return err; | |
453 | ||
454 | queue_delayed_work(system_power_efficient_wq, | |
455 | &flowtable->gc_work, HZ); | |
456 | ||
84453a90 FF |
457 | mutex_lock(&flowtable_lock); |
458 | list_add(&flowtable->list, &flowtables); | |
459 | mutex_unlock(&flowtable_lock); | |
460 | ||
a268de77 FF |
461 | return 0; |
462 | } | |
463 | EXPORT_SYMBOL_GPL(nf_flow_table_init); | |
464 | ||
c0ea1bcb PNA |
465 | static void nf_flow_table_do_cleanup(struct flow_offload *flow, void *data) |
466 | { | |
467 | struct net_device *dev = data; | |
a3fb3698 TY |
468 | struct flow_offload_entry *e; |
469 | ||
470 | e = container_of(flow, struct flow_offload_entry, flow); | |
c0ea1bcb | 471 | |
59c466dd FF |
472 | if (!dev) { |
473 | flow_offload_teardown(flow); | |
c0ea1bcb | 474 | return; |
59c466dd | 475 | } |
a3fb3698 TY |
476 | if (net_eq(nf_ct_net(e->ct), dev_net(dev)) && |
477 | (flow->tuplehash[0].tuple.iifidx == dev->ifindex || | |
478 | flow->tuplehash[1].tuple.iifidx == dev->ifindex)) | |
59c466dd | 479 | flow_offload_dead(flow); |
c0ea1bcb PNA |
480 | } |
481 | ||
482 | static void nf_flow_table_iterate_cleanup(struct nf_flowtable *flowtable, | |
84453a90 | 483 | struct net_device *dev) |
c0ea1bcb | 484 | { |
84453a90 | 485 | nf_flow_table_iterate(flowtable, nf_flow_table_do_cleanup, dev); |
c0ea1bcb PNA |
486 | flush_delayed_work(&flowtable->gc_work); |
487 | } | |
488 | ||
5f1be84a | 489 | void nf_flow_table_cleanup(struct net_device *dev) |
c0ea1bcb | 490 | { |
84453a90 FF |
491 | struct nf_flowtable *flowtable; |
492 | ||
493 | mutex_lock(&flowtable_lock); | |
494 | list_for_each_entry(flowtable, &flowtables, list) | |
495 | nf_flow_table_iterate_cleanup(flowtable, dev); | |
496 | mutex_unlock(&flowtable_lock); | |
c0ea1bcb PNA |
497 | } |
498 | EXPORT_SYMBOL_GPL(nf_flow_table_cleanup); | |
499 | ||
b408c5b0 PNA |
500 | void nf_flow_table_free(struct nf_flowtable *flow_table) |
501 | { | |
84453a90 FF |
502 | mutex_lock(&flowtable_lock); |
503 | list_del(&flow_table->list); | |
504 | mutex_unlock(&flowtable_lock); | |
a268de77 | 505 | cancel_delayed_work_sync(&flow_table->gc_work); |
b408c5b0 | 506 | nf_flow_table_iterate(flow_table, nf_flow_table_do_cleanup, NULL); |
0de22baa | 507 | nf_flow_offload_gc_step(flow_table); |
a268de77 | 508 | rhashtable_destroy(&flow_table->rhashtable); |
b408c5b0 PNA |
509 | } |
510 | EXPORT_SYMBOL_GPL(nf_flow_table_free); | |
511 | ||
ac2a6666 PNA |
512 | MODULE_LICENSE("GPL"); |
513 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); |