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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
ac2a6666 PNA |
2 | #include <linux/kernel.h> |
3 | #include <linux/init.h> | |
4 | #include <linux/module.h> | |
5 | #include <linux/netfilter.h> | |
6 | #include <linux/rhashtable.h> | |
7 | #include <linux/netdevice.h> | |
4f3780c0 FF |
8 | #include <net/ip.h> |
9 | #include <net/ip6_route.h> | |
c0ea1bcb | 10 | #include <net/netfilter/nf_tables.h> |
ac2a6666 PNA |
11 | #include <net/netfilter/nf_flow_table.h> |
12 | #include <net/netfilter/nf_conntrack.h> | |
13 | #include <net/netfilter/nf_conntrack_core.h> | |
40d102cd | 14 | #include <net/netfilter/nf_conntrack_l4proto.h> |
ac2a6666 PNA |
15 | #include <net/netfilter/nf_conntrack_tuple.h> |
16 | ||
17 | struct flow_offload_entry { | |
18 | struct flow_offload flow; | |
19 | struct nf_conn *ct; | |
20 | struct rcu_head rcu_head; | |
21 | }; | |
22 | ||
84453a90 FF |
23 | static DEFINE_MUTEX(flowtable_lock); |
24 | static LIST_HEAD(flowtables); | |
25 | ||
047b300e FF |
26 | static void |
27 | flow_offload_fill_dir(struct flow_offload *flow, struct nf_conn *ct, | |
28 | struct nf_flow_route *route, | |
29 | enum flow_offload_tuple_dir dir) | |
30 | { | |
31 | struct flow_offload_tuple *ft = &flow->tuplehash[dir].tuple; | |
32 | struct nf_conntrack_tuple *ctt = &ct->tuplehash[dir].tuple; | |
10f4e765 | 33 | struct dst_entry *other_dst = route->tuple[!dir].dst; |
4f3780c0 | 34 | struct dst_entry *dst = route->tuple[dir].dst; |
047b300e FF |
35 | |
36 | ft->dir = dir; | |
37 | ||
38 | switch (ctt->src.l3num) { | |
39 | case NFPROTO_IPV4: | |
40 | ft->src_v4 = ctt->src.u3.in; | |
41 | ft->dst_v4 = ctt->dst.u3.in; | |
4f3780c0 | 42 | ft->mtu = ip_dst_mtu_maybe_forward(dst, true); |
047b300e FF |
43 | break; |
44 | case NFPROTO_IPV6: | |
45 | ft->src_v6 = ctt->src.u3.in6; | |
46 | ft->dst_v6 = ctt->dst.u3.in6; | |
4f3780c0 | 47 | ft->mtu = ip6_dst_mtu_forward(dst); |
047b300e FF |
48 | break; |
49 | } | |
50 | ||
51 | ft->l3proto = ctt->src.l3num; | |
52 | ft->l4proto = ctt->dst.protonum; | |
53 | ft->src_port = ctt->src.u.tcp.port; | |
54 | ft->dst_port = ctt->dst.u.tcp.port; | |
55 | ||
10f4e765 | 56 | ft->iifidx = other_dst->dev->ifindex; |
4f3780c0 | 57 | ft->dst_cache = dst; |
047b300e FF |
58 | } |
59 | ||
ac2a6666 PNA |
60 | struct flow_offload * |
61 | flow_offload_alloc(struct nf_conn *ct, struct nf_flow_route *route) | |
62 | { | |
63 | struct flow_offload_entry *entry; | |
64 | struct flow_offload *flow; | |
65 | ||
66 | if (unlikely(nf_ct_is_dying(ct) || | |
67 | !atomic_inc_not_zero(&ct->ct_general.use))) | |
68 | return NULL; | |
69 | ||
70 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
71 | if (!entry) | |
72 | goto err_ct_refcnt; | |
73 | ||
74 | flow = &entry->flow; | |
75 | ||
76 | if (!dst_hold_safe(route->tuple[FLOW_OFFLOAD_DIR_ORIGINAL].dst)) | |
77 | goto err_dst_cache_original; | |
78 | ||
79 | if (!dst_hold_safe(route->tuple[FLOW_OFFLOAD_DIR_REPLY].dst)) | |
80 | goto err_dst_cache_reply; | |
81 | ||
82 | entry->ct = ct; | |
83 | ||
047b300e FF |
84 | flow_offload_fill_dir(flow, ct, route, FLOW_OFFLOAD_DIR_ORIGINAL); |
85 | flow_offload_fill_dir(flow, ct, route, FLOW_OFFLOAD_DIR_REPLY); | |
ac2a6666 PNA |
86 | |
87 | if (ct->status & IPS_SRC_NAT) | |
88 | flow->flags |= FLOW_OFFLOAD_SNAT; | |
df1e2025 | 89 | if (ct->status & IPS_DST_NAT) |
ac2a6666 PNA |
90 | flow->flags |= FLOW_OFFLOAD_DNAT; |
91 | ||
92 | return flow; | |
93 | ||
94 | err_dst_cache_reply: | |
95 | dst_release(route->tuple[FLOW_OFFLOAD_DIR_ORIGINAL].dst); | |
96 | err_dst_cache_original: | |
97 | kfree(entry); | |
98 | err_ct_refcnt: | |
99 | nf_ct_put(ct); | |
100 | ||
101 | return NULL; | |
102 | } | |
103 | EXPORT_SYMBOL_GPL(flow_offload_alloc); | |
104 | ||
da5984e5 FF |
105 | static void flow_offload_fixup_tcp(struct ip_ct_tcp *tcp) |
106 | { | |
107 | tcp->state = TCP_CONNTRACK_ESTABLISHED; | |
108 | tcp->seen[0].td_maxwin = 0; | |
109 | tcp->seen[1].td_maxwin = 0; | |
110 | } | |
111 | ||
e97d9404 FW |
112 | #define NF_FLOWTABLE_TCP_PICKUP_TIMEOUT (120 * HZ) |
113 | #define NF_FLOWTABLE_UDP_PICKUP_TIMEOUT (30 * HZ) | |
114 | ||
1e5b2471 PNA |
115 | static inline __s32 nf_flow_timeout_delta(unsigned int timeout) |
116 | { | |
117 | return (__s32)(timeout - (u32)jiffies); | |
118 | } | |
119 | ||
120 | static void flow_offload_fixup_ct_timeout(struct nf_conn *ct) | |
da5984e5 FF |
121 | { |
122 | const struct nf_conntrack_l4proto *l4proto; | |
1e5b2471 | 123 | int l4num = nf_ct_protonum(ct); |
da5984e5 | 124 | unsigned int timeout; |
da5984e5 | 125 | |
4a60dc74 | 126 | l4proto = nf_ct_l4proto_find(l4num); |
da5984e5 FF |
127 | if (!l4proto) |
128 | return; | |
129 | ||
da5984e5 | 130 | if (l4num == IPPROTO_TCP) |
e97d9404 | 131 | timeout = NF_FLOWTABLE_TCP_PICKUP_TIMEOUT; |
da5984e5 | 132 | else if (l4num == IPPROTO_UDP) |
e97d9404 | 133 | timeout = NF_FLOWTABLE_UDP_PICKUP_TIMEOUT; |
da5984e5 FF |
134 | else |
135 | return; | |
136 | ||
1e5b2471 PNA |
137 | if (nf_flow_timeout_delta(ct->timeout) > (__s32)timeout) |
138 | ct->timeout = nfct_time_stamp + timeout; | |
139 | } | |
140 | ||
141 | static void flow_offload_fixup_ct_state(struct nf_conn *ct) | |
142 | { | |
143 | if (nf_ct_protonum(ct) == IPPROTO_TCP) | |
144 | flow_offload_fixup_tcp(&ct->proto.tcp); | |
145 | } | |
146 | ||
147 | static void flow_offload_fixup_ct(struct nf_conn *ct) | |
148 | { | |
149 | flow_offload_fixup_ct_state(ct); | |
150 | flow_offload_fixup_ct_timeout(ct); | |
da5984e5 FF |
151 | } |
152 | ||
ac2a6666 PNA |
153 | void flow_offload_free(struct flow_offload *flow) |
154 | { | |
155 | struct flow_offload_entry *e; | |
156 | ||
157 | dst_release(flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.dst_cache); | |
158 | dst_release(flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst_cache); | |
159 | e = container_of(flow, struct flow_offload_entry, flow); | |
da5984e5 FF |
160 | if (flow->flags & FLOW_OFFLOAD_DYING) |
161 | nf_ct_delete(e->ct, 0, 0); | |
0ff90b6c FF |
162 | nf_ct_put(e->ct); |
163 | kfree_rcu(e, rcu_head); | |
ac2a6666 PNA |
164 | } |
165 | EXPORT_SYMBOL_GPL(flow_offload_free); | |
166 | ||
a268de77 FF |
167 | static u32 flow_offload_hash(const void *data, u32 len, u32 seed) |
168 | { | |
169 | const struct flow_offload_tuple *tuple = data; | |
170 | ||
171 | return jhash(tuple, offsetof(struct flow_offload_tuple, dir), seed); | |
172 | } | |
173 | ||
174 | static u32 flow_offload_hash_obj(const void *data, u32 len, u32 seed) | |
175 | { | |
176 | const struct flow_offload_tuple_rhash *tuplehash = data; | |
177 | ||
178 | return jhash(&tuplehash->tuple, offsetof(struct flow_offload_tuple, dir), seed); | |
179 | } | |
180 | ||
181 | static int flow_offload_hash_cmp(struct rhashtable_compare_arg *arg, | |
182 | const void *ptr) | |
183 | { | |
184 | const struct flow_offload_tuple *tuple = arg->key; | |
185 | const struct flow_offload_tuple_rhash *x = ptr; | |
186 | ||
187 | if (memcmp(&x->tuple, tuple, offsetof(struct flow_offload_tuple, dir))) | |
188 | return 1; | |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
193 | static const struct rhashtable_params nf_flow_offload_rhash_params = { | |
194 | .head_offset = offsetof(struct flow_offload_tuple_rhash, node), | |
195 | .hashfn = flow_offload_hash, | |
196 | .obj_hashfn = flow_offload_hash_obj, | |
197 | .obj_cmpfn = flow_offload_hash_cmp, | |
198 | .automatic_shrinking = true, | |
199 | }; | |
200 | ||
ac2a6666 PNA |
201 | int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload *flow) |
202 | { | |
43c8f131 TY |
203 | int err; |
204 | ||
205 | err = rhashtable_insert_fast(&flow_table->rhashtable, | |
206 | &flow->tuplehash[0].node, | |
207 | nf_flow_offload_rhash_params); | |
208 | if (err < 0) | |
209 | return err; | |
210 | ||
211 | err = rhashtable_insert_fast(&flow_table->rhashtable, | |
212 | &flow->tuplehash[1].node, | |
213 | nf_flow_offload_rhash_params); | |
214 | if (err < 0) { | |
215 | rhashtable_remove_fast(&flow_table->rhashtable, | |
216 | &flow->tuplehash[0].node, | |
217 | nf_flow_offload_rhash_params); | |
218 | return err; | |
219 | } | |
ac2a6666 | 220 | |
110e4872 | 221 | flow->timeout = (u32)jiffies + NF_FLOW_TIMEOUT; |
ac2a6666 PNA |
222 | return 0; |
223 | } | |
224 | EXPORT_SYMBOL_GPL(flow_offload_add); | |
225 | ||
3e68db2f PNA |
226 | static inline bool nf_flow_has_expired(const struct flow_offload *flow) |
227 | { | |
1e5b2471 | 228 | return nf_flow_timeout_delta(flow->timeout) <= 0; |
3e68db2f PNA |
229 | } |
230 | ||
0ff90b6c FF |
231 | static void flow_offload_del(struct nf_flowtable *flow_table, |
232 | struct flow_offload *flow) | |
ac2a6666 | 233 | { |
da5984e5 FF |
234 | struct flow_offload_entry *e; |
235 | ||
ac2a6666 PNA |
236 | rhashtable_remove_fast(&flow_table->rhashtable, |
237 | &flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].node, | |
a268de77 | 238 | nf_flow_offload_rhash_params); |
ac2a6666 PNA |
239 | rhashtable_remove_fast(&flow_table->rhashtable, |
240 | &flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].node, | |
a268de77 | 241 | nf_flow_offload_rhash_params); |
ac2a6666 | 242 | |
da5984e5 FF |
243 | e = container_of(flow, struct flow_offload_entry, flow); |
244 | clear_bit(IPS_OFFLOAD_BIT, &e->ct->status); | |
245 | ||
3e68db2f PNA |
246 | if (nf_flow_has_expired(flow)) |
247 | flow_offload_fixup_ct(e->ct); | |
1e5b2471 PNA |
248 | else if (flow->flags & FLOW_OFFLOAD_TEARDOWN) |
249 | flow_offload_fixup_ct_timeout(e->ct); | |
3e68db2f | 250 | |
0ff90b6c | 251 | flow_offload_free(flow); |
ac2a6666 | 252 | } |
ac2a6666 | 253 | |
59c466dd FF |
254 | void flow_offload_teardown(struct flow_offload *flow) |
255 | { | |
da5984e5 FF |
256 | struct flow_offload_entry *e; |
257 | ||
59c466dd | 258 | flow->flags |= FLOW_OFFLOAD_TEARDOWN; |
da5984e5 FF |
259 | |
260 | e = container_of(flow, struct flow_offload_entry, flow); | |
1e5b2471 | 261 | flow_offload_fixup_ct_state(e->ct); |
59c466dd FF |
262 | } |
263 | EXPORT_SYMBOL_GPL(flow_offload_teardown); | |
264 | ||
ac2a6666 PNA |
265 | struct flow_offload_tuple_rhash * |
266 | flow_offload_lookup(struct nf_flowtable *flow_table, | |
267 | struct flow_offload_tuple *tuple) | |
268 | { | |
ba03137f FF |
269 | struct flow_offload_tuple_rhash *tuplehash; |
270 | struct flow_offload *flow; | |
8cd2bc98 | 271 | struct flow_offload_entry *e; |
ba03137f FF |
272 | int dir; |
273 | ||
a2d88182 TY |
274 | tuplehash = rhashtable_lookup(&flow_table->rhashtable, tuple, |
275 | nf_flow_offload_rhash_params); | |
ba03137f FF |
276 | if (!tuplehash) |
277 | return NULL; | |
278 | ||
279 | dir = tuplehash->tuple.dir; | |
280 | flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]); | |
281 | if (flow->flags & (FLOW_OFFLOAD_DYING | FLOW_OFFLOAD_TEARDOWN)) | |
282 | return NULL; | |
283 | ||
8cd2bc98 TY |
284 | e = container_of(flow, struct flow_offload_entry, flow); |
285 | if (unlikely(nf_ct_is_dying(e->ct))) | |
286 | return NULL; | |
287 | ||
ba03137f | 288 | return tuplehash; |
ac2a6666 PNA |
289 | } |
290 | EXPORT_SYMBOL_GPL(flow_offload_lookup); | |
291 | ||
49de9c09 TY |
292 | static int |
293 | nf_flow_table_iterate(struct nf_flowtable *flow_table, | |
294 | void (*iter)(struct flow_offload *flow, void *data), | |
295 | void *data) | |
ac2a6666 PNA |
296 | { |
297 | struct flow_offload_tuple_rhash *tuplehash; | |
298 | struct rhashtable_iter hti; | |
299 | struct flow_offload *flow; | |
0de22baa | 300 | int err = 0; |
ac2a6666 | 301 | |
0de22baa | 302 | rhashtable_walk_enter(&flow_table->rhashtable, &hti); |
ac2a6666 PNA |
303 | rhashtable_walk_start(&hti); |
304 | ||
305 | while ((tuplehash = rhashtable_walk_next(&hti))) { | |
306 | if (IS_ERR(tuplehash)) { | |
0de22baa TY |
307 | if (PTR_ERR(tuplehash) != -EAGAIN) { |
308 | err = PTR_ERR(tuplehash); | |
309 | break; | |
310 | } | |
ac2a6666 PNA |
311 | continue; |
312 | } | |
313 | if (tuplehash->tuple.dir) | |
314 | continue; | |
315 | ||
316 | flow = container_of(tuplehash, struct flow_offload, tuplehash[0]); | |
317 | ||
318 | iter(flow, data); | |
319 | } | |
ac2a6666 PNA |
320 | rhashtable_walk_stop(&hti); |
321 | rhashtable_walk_exit(&hti); | |
322 | ||
323 | return err; | |
324 | } | |
ac2a6666 | 325 | |
b9660987 | 326 | static void nf_flow_offload_gc_step(struct flow_offload *flow, void *data) |
ac2a6666 | 327 | { |
b9660987 | 328 | struct nf_flowtable *flow_table = data; |
8cd2bc98 | 329 | struct flow_offload_entry *e; |
ac2a6666 | 330 | |
8cd2bc98 TY |
331 | e = container_of(flow, struct flow_offload_entry, flow); |
332 | if (nf_flow_has_expired(flow) || nf_ct_is_dying(e->ct) || | |
b9660987 TY |
333 | (flow->flags & (FLOW_OFFLOAD_DYING | FLOW_OFFLOAD_TEARDOWN))) |
334 | flow_offload_del(flow_table, flow); | |
b408c5b0 PNA |
335 | } |
336 | ||
a268de77 | 337 | static void nf_flow_offload_work_gc(struct work_struct *work) |
b408c5b0 PNA |
338 | { |
339 | struct nf_flowtable *flow_table; | |
340 | ||
341 | flow_table = container_of(work, struct nf_flowtable, gc_work.work); | |
b9660987 | 342 | nf_flow_table_iterate(flow_table, nf_flow_offload_gc_step, flow_table); |
ac2a6666 PNA |
343 | queue_delayed_work(system_power_efficient_wq, &flow_table->gc_work, HZ); |
344 | } | |
ac2a6666 PNA |
345 | |
346 | static int nf_flow_nat_port_tcp(struct sk_buff *skb, unsigned int thoff, | |
347 | __be16 port, __be16 new_port) | |
348 | { | |
349 | struct tcphdr *tcph; | |
350 | ||
351 | if (!pskb_may_pull(skb, thoff + sizeof(*tcph)) || | |
352 | skb_try_make_writable(skb, thoff + sizeof(*tcph))) | |
353 | return -1; | |
354 | ||
355 | tcph = (void *)(skb_network_header(skb) + thoff); | |
356 | inet_proto_csum_replace2(&tcph->check, skb, port, new_port, true); | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | static int nf_flow_nat_port_udp(struct sk_buff *skb, unsigned int thoff, | |
362 | __be16 port, __be16 new_port) | |
363 | { | |
364 | struct udphdr *udph; | |
365 | ||
366 | if (!pskb_may_pull(skb, thoff + sizeof(*udph)) || | |
367 | skb_try_make_writable(skb, thoff + sizeof(*udph))) | |
368 | return -1; | |
369 | ||
370 | udph = (void *)(skb_network_header(skb) + thoff); | |
371 | if (udph->check || skb->ip_summed == CHECKSUM_PARTIAL) { | |
372 | inet_proto_csum_replace2(&udph->check, skb, port, | |
373 | new_port, true); | |
374 | if (!udph->check) | |
375 | udph->check = CSUM_MANGLED_0; | |
376 | } | |
377 | ||
378 | return 0; | |
379 | } | |
380 | ||
381 | static int nf_flow_nat_port(struct sk_buff *skb, unsigned int thoff, | |
382 | u8 protocol, __be16 port, __be16 new_port) | |
383 | { | |
384 | switch (protocol) { | |
385 | case IPPROTO_TCP: | |
386 | if (nf_flow_nat_port_tcp(skb, thoff, port, new_port) < 0) | |
387 | return NF_DROP; | |
388 | break; | |
389 | case IPPROTO_UDP: | |
390 | if (nf_flow_nat_port_udp(skb, thoff, port, new_port) < 0) | |
391 | return NF_DROP; | |
392 | break; | |
393 | } | |
394 | ||
395 | return 0; | |
396 | } | |
397 | ||
398 | int nf_flow_snat_port(const struct flow_offload *flow, | |
399 | struct sk_buff *skb, unsigned int thoff, | |
400 | u8 protocol, enum flow_offload_tuple_dir dir) | |
401 | { | |
402 | struct flow_ports *hdr; | |
403 | __be16 port, new_port; | |
404 | ||
405 | if (!pskb_may_pull(skb, thoff + sizeof(*hdr)) || | |
406 | skb_try_make_writable(skb, thoff + sizeof(*hdr))) | |
407 | return -1; | |
408 | ||
409 | hdr = (void *)(skb_network_header(skb) + thoff); | |
410 | ||
411 | switch (dir) { | |
412 | case FLOW_OFFLOAD_DIR_ORIGINAL: | |
413 | port = hdr->source; | |
414 | new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst_port; | |
415 | hdr->source = new_port; | |
416 | break; | |
417 | case FLOW_OFFLOAD_DIR_REPLY: | |
418 | port = hdr->dest; | |
419 | new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.src_port; | |
420 | hdr->dest = new_port; | |
421 | break; | |
422 | default: | |
423 | return -1; | |
424 | } | |
425 | ||
426 | return nf_flow_nat_port(skb, thoff, protocol, port, new_port); | |
427 | } | |
428 | EXPORT_SYMBOL_GPL(nf_flow_snat_port); | |
429 | ||
430 | int nf_flow_dnat_port(const struct flow_offload *flow, | |
431 | struct sk_buff *skb, unsigned int thoff, | |
432 | u8 protocol, enum flow_offload_tuple_dir dir) | |
433 | { | |
434 | struct flow_ports *hdr; | |
435 | __be16 port, new_port; | |
436 | ||
437 | if (!pskb_may_pull(skb, thoff + sizeof(*hdr)) || | |
438 | skb_try_make_writable(skb, thoff + sizeof(*hdr))) | |
439 | return -1; | |
440 | ||
441 | hdr = (void *)(skb_network_header(skb) + thoff); | |
442 | ||
443 | switch (dir) { | |
444 | case FLOW_OFFLOAD_DIR_ORIGINAL: | |
445 | port = hdr->dest; | |
446 | new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.src_port; | |
447 | hdr->dest = new_port; | |
448 | break; | |
449 | case FLOW_OFFLOAD_DIR_REPLY: | |
450 | port = hdr->source; | |
451 | new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.dst_port; | |
452 | hdr->source = new_port; | |
453 | break; | |
454 | default: | |
455 | return -1; | |
456 | } | |
457 | ||
458 | return nf_flow_nat_port(skb, thoff, protocol, port, new_port); | |
459 | } | |
460 | EXPORT_SYMBOL_GPL(nf_flow_dnat_port); | |
461 | ||
a268de77 FF |
462 | int nf_flow_table_init(struct nf_flowtable *flowtable) |
463 | { | |
464 | int err; | |
465 | ||
466 | INIT_DEFERRABLE_WORK(&flowtable->gc_work, nf_flow_offload_work_gc); | |
467 | ||
468 | err = rhashtable_init(&flowtable->rhashtable, | |
469 | &nf_flow_offload_rhash_params); | |
470 | if (err < 0) | |
471 | return err; | |
472 | ||
473 | queue_delayed_work(system_power_efficient_wq, | |
474 | &flowtable->gc_work, HZ); | |
475 | ||
84453a90 FF |
476 | mutex_lock(&flowtable_lock); |
477 | list_add(&flowtable->list, &flowtables); | |
478 | mutex_unlock(&flowtable_lock); | |
479 | ||
a268de77 FF |
480 | return 0; |
481 | } | |
482 | EXPORT_SYMBOL_GPL(nf_flow_table_init); | |
483 | ||
c0ea1bcb PNA |
484 | static void nf_flow_table_do_cleanup(struct flow_offload *flow, void *data) |
485 | { | |
486 | struct net_device *dev = data; | |
a3fb3698 TY |
487 | struct flow_offload_entry *e; |
488 | ||
489 | e = container_of(flow, struct flow_offload_entry, flow); | |
c0ea1bcb | 490 | |
59c466dd FF |
491 | if (!dev) { |
492 | flow_offload_teardown(flow); | |
c0ea1bcb | 493 | return; |
59c466dd | 494 | } |
a3fb3698 TY |
495 | if (net_eq(nf_ct_net(e->ct), dev_net(dev)) && |
496 | (flow->tuplehash[0].tuple.iifidx == dev->ifindex || | |
497 | flow->tuplehash[1].tuple.iifidx == dev->ifindex)) | |
59c466dd | 498 | flow_offload_dead(flow); |
c0ea1bcb PNA |
499 | } |
500 | ||
501 | static void nf_flow_table_iterate_cleanup(struct nf_flowtable *flowtable, | |
84453a90 | 502 | struct net_device *dev) |
c0ea1bcb | 503 | { |
84453a90 | 504 | nf_flow_table_iterate(flowtable, nf_flow_table_do_cleanup, dev); |
c0ea1bcb PNA |
505 | flush_delayed_work(&flowtable->gc_work); |
506 | } | |
507 | ||
5f1be84a | 508 | void nf_flow_table_cleanup(struct net_device *dev) |
c0ea1bcb | 509 | { |
84453a90 FF |
510 | struct nf_flowtable *flowtable; |
511 | ||
512 | mutex_lock(&flowtable_lock); | |
513 | list_for_each_entry(flowtable, &flowtables, list) | |
514 | nf_flow_table_iterate_cleanup(flowtable, dev); | |
515 | mutex_unlock(&flowtable_lock); | |
c0ea1bcb PNA |
516 | } |
517 | EXPORT_SYMBOL_GPL(nf_flow_table_cleanup); | |
518 | ||
b408c5b0 PNA |
519 | void nf_flow_table_free(struct nf_flowtable *flow_table) |
520 | { | |
84453a90 FF |
521 | mutex_lock(&flowtable_lock); |
522 | list_del(&flow_table->list); | |
523 | mutex_unlock(&flowtable_lock); | |
a268de77 | 524 | cancel_delayed_work_sync(&flow_table->gc_work); |
b408c5b0 | 525 | nf_flow_table_iterate(flow_table, nf_flow_table_do_cleanup, NULL); |
b9660987 | 526 | nf_flow_table_iterate(flow_table, nf_flow_offload_gc_step, flow_table); |
a268de77 | 527 | rhashtable_destroy(&flow_table->rhashtable); |
b408c5b0 PNA |
528 | } |
529 | EXPORT_SYMBOL_GPL(nf_flow_table_free); | |
530 | ||
ac2a6666 PNA |
531 | MODULE_LICENSE("GPL"); |
532 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); |