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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 | ||
84453a90 FF |
17 | static DEFINE_MUTEX(flowtable_lock); |
18 | static LIST_HEAD(flowtables); | |
19 | ||
047b300e | 20 | static void |
458a1828 | 21 | flow_offload_fill_dir(struct flow_offload *flow, |
047b300e FF |
22 | enum flow_offload_tuple_dir dir) |
23 | { | |
24 | struct flow_offload_tuple *ft = &flow->tuplehash[dir].tuple; | |
458a1828 | 25 | struct nf_conntrack_tuple *ctt = &flow->ct->tuplehash[dir].tuple; |
047b300e FF |
26 | |
27 | ft->dir = dir; | |
28 | ||
29 | switch (ctt->src.l3num) { | |
30 | case NFPROTO_IPV4: | |
31 | ft->src_v4 = ctt->src.u3.in; | |
32 | ft->dst_v4 = ctt->dst.u3.in; | |
33 | break; | |
34 | case NFPROTO_IPV6: | |
35 | ft->src_v6 = ctt->src.u3.in6; | |
36 | ft->dst_v6 = ctt->dst.u3.in6; | |
37 | break; | |
38 | } | |
39 | ||
40 | ft->l3proto = ctt->src.l3num; | |
41 | ft->l4proto = ctt->dst.protonum; | |
42 | ft->src_port = ctt->src.u.tcp.port; | |
43 | ft->dst_port = ctt->dst.u.tcp.port; | |
047b300e FF |
44 | } |
45 | ||
f1363e05 | 46 | struct flow_offload *flow_offload_alloc(struct nf_conn *ct) |
ac2a6666 | 47 | { |
ac2a6666 PNA |
48 | struct flow_offload *flow; |
49 | ||
50 | if (unlikely(nf_ct_is_dying(ct) || | |
51 | !atomic_inc_not_zero(&ct->ct_general.use))) | |
52 | return NULL; | |
53 | ||
62248df8 PNA |
54 | flow = kzalloc(sizeof(*flow), GFP_ATOMIC); |
55 | if (!flow) | |
ac2a6666 PNA |
56 | goto err_ct_refcnt; |
57 | ||
b32d2f34 | 58 | flow->ct = ct; |
ac2a6666 | 59 | |
458a1828 | 60 | flow_offload_fill_dir(flow, FLOW_OFFLOAD_DIR_ORIGINAL); |
61 | flow_offload_fill_dir(flow, FLOW_OFFLOAD_DIR_REPLY); | |
ac2a6666 PNA |
62 | |
63 | if (ct->status & IPS_SRC_NAT) | |
355a8b13 | 64 | __set_bit(NF_FLOW_SNAT, &flow->flags); |
df1e2025 | 65 | if (ct->status & IPS_DST_NAT) |
355a8b13 | 66 | __set_bit(NF_FLOW_DNAT, &flow->flags); |
ac2a6666 PNA |
67 | |
68 | return flow; | |
69 | ||
ac2a6666 PNA |
70 | err_ct_refcnt: |
71 | nf_ct_put(ct); | |
72 | ||
73 | return NULL; | |
74 | } | |
75 | EXPORT_SYMBOL_GPL(flow_offload_alloc); | |
76 | ||
8b9229d1 PNA |
77 | static u32 flow_offload_dst_cookie(struct flow_offload_tuple *flow_tuple) |
78 | { | |
79 | const struct rt6_info *rt; | |
80 | ||
81 | if (flow_tuple->l3proto == NFPROTO_IPV6) { | |
82 | rt = (const struct rt6_info *)flow_tuple->dst_cache; | |
83 | return rt6_get_cookie(rt); | |
84 | } | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
f1363e05 PNA |
89 | static int flow_offload_fill_route(struct flow_offload *flow, |
90 | const struct nf_flow_route *route, | |
91 | enum flow_offload_tuple_dir dir) | |
92 | { | |
93 | struct flow_offload_tuple *flow_tuple = &flow->tuplehash[dir].tuple; | |
f1363e05 | 94 | struct dst_entry *dst = route->tuple[dir].dst; |
4cd91f7c | 95 | int i, j = 0; |
f1363e05 | 96 | |
f1363e05 PNA |
97 | switch (flow_tuple->l3proto) { |
98 | case NFPROTO_IPV4: | |
99 | flow_tuple->mtu = ip_dst_mtu_maybe_forward(dst, true); | |
100 | break; | |
101 | case NFPROTO_IPV6: | |
102 | flow_tuple->mtu = ip6_dst_mtu_forward(dst); | |
103 | break; | |
104 | } | |
105 | ||
c63a7cc4 | 106 | flow_tuple->iifidx = route->tuple[dir].in.ifindex; |
4cd91f7c PNA |
107 | for (i = route->tuple[dir].in.num_encaps - 1; i >= 0; i--) { |
108 | flow_tuple->encap[j].id = route->tuple[dir].in.encap[i].id; | |
109 | flow_tuple->encap[j].proto = route->tuple[dir].in.encap[i].proto; | |
26267bf9 FF |
110 | if (route->tuple[dir].in.ingress_vlans & BIT(i)) |
111 | flow_tuple->in_vlan_ingress |= BIT(j); | |
4cd91f7c PNA |
112 | j++; |
113 | } | |
114 | flow_tuple->encap_num = route->tuple[dir].in.num_encaps; | |
7a27f6ab PNA |
115 | |
116 | switch (route->tuple[dir].xmit_type) { | |
117 | case FLOW_OFFLOAD_XMIT_DIRECT: | |
118 | memcpy(flow_tuple->out.h_dest, route->tuple[dir].out.h_dest, | |
119 | ETH_ALEN); | |
120 | memcpy(flow_tuple->out.h_source, route->tuple[dir].out.h_source, | |
121 | ETH_ALEN); | |
122 | flow_tuple->out.ifidx = route->tuple[dir].out.ifindex; | |
73f97025 | 123 | flow_tuple->out.hw_ifidx = route->tuple[dir].out.hw_ifindex; |
7a27f6ab PNA |
124 | break; |
125 | case FLOW_OFFLOAD_XMIT_XFRM: | |
126 | case FLOW_OFFLOAD_XMIT_NEIGH: | |
127 | if (!dst_hold_safe(route->tuple[dir].dst)) | |
128 | return -1; | |
129 | ||
130 | flow_tuple->dst_cache = dst; | |
8b9229d1 | 131 | flow_tuple->dst_cookie = flow_offload_dst_cookie(flow_tuple); |
7a27f6ab | 132 | break; |
78ed0a9b RD |
133 | default: |
134 | WARN_ON_ONCE(1); | |
135 | break; | |
7a27f6ab | 136 | } |
5139c0c0 | 137 | flow_tuple->xmit_type = route->tuple[dir].xmit_type; |
f1363e05 PNA |
138 | |
139 | return 0; | |
140 | } | |
141 | ||
7a27f6ab PNA |
142 | static void nft_flow_dst_release(struct flow_offload *flow, |
143 | enum flow_offload_tuple_dir dir) | |
144 | { | |
145 | if (flow->tuplehash[dir].tuple.xmit_type == FLOW_OFFLOAD_XMIT_NEIGH || | |
146 | flow->tuplehash[dir].tuple.xmit_type == FLOW_OFFLOAD_XMIT_XFRM) | |
147 | dst_release(flow->tuplehash[dir].tuple.dst_cache); | |
148 | } | |
149 | ||
f1363e05 PNA |
150 | int flow_offload_route_init(struct flow_offload *flow, |
151 | const struct nf_flow_route *route) | |
152 | { | |
153 | int err; | |
154 | ||
155 | err = flow_offload_fill_route(flow, route, FLOW_OFFLOAD_DIR_ORIGINAL); | |
156 | if (err < 0) | |
157 | return err; | |
158 | ||
159 | err = flow_offload_fill_route(flow, route, FLOW_OFFLOAD_DIR_REPLY); | |
160 | if (err < 0) | |
161 | goto err_route_reply; | |
162 | ||
163 | flow->type = NF_FLOW_OFFLOAD_ROUTE; | |
164 | ||
165 | return 0; | |
166 | ||
167 | err_route_reply: | |
7a27f6ab | 168 | nft_flow_dst_release(flow, FLOW_OFFLOAD_DIR_ORIGINAL); |
f1363e05 PNA |
169 | |
170 | return err; | |
171 | } | |
172 | EXPORT_SYMBOL_GPL(flow_offload_route_init); | |
173 | ||
da5984e5 FF |
174 | static void flow_offload_fixup_tcp(struct ip_ct_tcp *tcp) |
175 | { | |
176 | tcp->state = TCP_CONNTRACK_ESTABLISHED; | |
177 | tcp->seen[0].td_maxwin = 0; | |
178 | tcp->seen[1].td_maxwin = 0; | |
179 | } | |
180 | ||
e97d9404 FW |
181 | #define NF_FLOWTABLE_TCP_PICKUP_TIMEOUT (120 * HZ) |
182 | #define NF_FLOWTABLE_UDP_PICKUP_TIMEOUT (30 * HZ) | |
183 | ||
1e5b2471 | 184 | static void flow_offload_fixup_ct_timeout(struct nf_conn *ct) |
da5984e5 FF |
185 | { |
186 | const struct nf_conntrack_l4proto *l4proto; | |
1e5b2471 | 187 | int l4num = nf_ct_protonum(ct); |
da5984e5 | 188 | unsigned int timeout; |
da5984e5 | 189 | |
4a60dc74 | 190 | l4proto = nf_ct_l4proto_find(l4num); |
da5984e5 FF |
191 | if (!l4proto) |
192 | return; | |
193 | ||
da5984e5 | 194 | if (l4num == IPPROTO_TCP) |
e97d9404 | 195 | timeout = NF_FLOWTABLE_TCP_PICKUP_TIMEOUT; |
da5984e5 | 196 | else if (l4num == IPPROTO_UDP) |
e97d9404 | 197 | timeout = NF_FLOWTABLE_UDP_PICKUP_TIMEOUT; |
da5984e5 FF |
198 | else |
199 | return; | |
200 | ||
1e5b2471 PNA |
201 | if (nf_flow_timeout_delta(ct->timeout) > (__s32)timeout) |
202 | ct->timeout = nfct_time_stamp + timeout; | |
203 | } | |
204 | ||
205 | static void flow_offload_fixup_ct_state(struct nf_conn *ct) | |
206 | { | |
207 | if (nf_ct_protonum(ct) == IPPROTO_TCP) | |
208 | flow_offload_fixup_tcp(&ct->proto.tcp); | |
209 | } | |
210 | ||
211 | static void flow_offload_fixup_ct(struct nf_conn *ct) | |
212 | { | |
213 | flow_offload_fixup_ct_state(ct); | |
214 | flow_offload_fixup_ct_timeout(ct); | |
da5984e5 FF |
215 | } |
216 | ||
f1363e05 | 217 | static void flow_offload_route_release(struct flow_offload *flow) |
ac2a6666 | 218 | { |
7a27f6ab PNA |
219 | nft_flow_dst_release(flow, FLOW_OFFLOAD_DIR_ORIGINAL); |
220 | nft_flow_dst_release(flow, FLOW_OFFLOAD_DIR_REPLY); | |
f1363e05 PNA |
221 | } |
222 | ||
223 | void flow_offload_free(struct flow_offload *flow) | |
224 | { | |
225 | switch (flow->type) { | |
226 | case NF_FLOW_OFFLOAD_ROUTE: | |
227 | flow_offload_route_release(flow); | |
228 | break; | |
229 | default: | |
230 | break; | |
231 | } | |
b32d2f34 | 232 | nf_ct_put(flow->ct); |
62248df8 | 233 | kfree_rcu(flow, rcu_head); |
ac2a6666 PNA |
234 | } |
235 | EXPORT_SYMBOL_GPL(flow_offload_free); | |
236 | ||
a268de77 FF |
237 | static u32 flow_offload_hash(const void *data, u32 len, u32 seed) |
238 | { | |
239 | const struct flow_offload_tuple *tuple = data; | |
240 | ||
dbc859d9 | 241 | return jhash(tuple, offsetof(struct flow_offload_tuple, __hash), seed); |
a268de77 FF |
242 | } |
243 | ||
244 | static u32 flow_offload_hash_obj(const void *data, u32 len, u32 seed) | |
245 | { | |
246 | const struct flow_offload_tuple_rhash *tuplehash = data; | |
247 | ||
dbc859d9 | 248 | return jhash(&tuplehash->tuple, offsetof(struct flow_offload_tuple, __hash), seed); |
a268de77 FF |
249 | } |
250 | ||
251 | static int flow_offload_hash_cmp(struct rhashtable_compare_arg *arg, | |
252 | const void *ptr) | |
253 | { | |
254 | const struct flow_offload_tuple *tuple = arg->key; | |
255 | const struct flow_offload_tuple_rhash *x = ptr; | |
256 | ||
dbc859d9 | 257 | if (memcmp(&x->tuple, tuple, offsetof(struct flow_offload_tuple, __hash))) |
a268de77 FF |
258 | return 1; |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
263 | static const struct rhashtable_params nf_flow_offload_rhash_params = { | |
264 | .head_offset = offsetof(struct flow_offload_tuple_rhash, node), | |
265 | .hashfn = flow_offload_hash, | |
266 | .obj_hashfn = flow_offload_hash_obj, | |
267 | .obj_cmpfn = flow_offload_hash_cmp, | |
268 | .automatic_shrinking = true, | |
269 | }; | |
270 | ||
ac2a6666 PNA |
271 | int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload *flow) |
272 | { | |
43c8f131 TY |
273 | int err; |
274 | ||
fb46f1b7 | 275 | flow->timeout = nf_flowtable_time_stamp + NF_FLOW_TIMEOUT; |
daf61b02 | 276 | |
43c8f131 TY |
277 | err = rhashtable_insert_fast(&flow_table->rhashtable, |
278 | &flow->tuplehash[0].node, | |
279 | nf_flow_offload_rhash_params); | |
280 | if (err < 0) | |
281 | return err; | |
282 | ||
283 | err = rhashtable_insert_fast(&flow_table->rhashtable, | |
284 | &flow->tuplehash[1].node, | |
285 | nf_flow_offload_rhash_params); | |
286 | if (err < 0) { | |
287 | rhashtable_remove_fast(&flow_table->rhashtable, | |
288 | &flow->tuplehash[0].node, | |
289 | nf_flow_offload_rhash_params); | |
290 | return err; | |
291 | } | |
ac2a6666 | 292 | |
4203b19c RD |
293 | nf_ct_offload_timeout(flow->ct); |
294 | ||
f698fe40 PNA |
295 | if (nf_flowtable_hw_offload(flow_table)) { |
296 | __set_bit(NF_FLOW_HW, &flow->flags); | |
c29f74e0 | 297 | nf_flow_offload_add(flow_table, flow); |
f698fe40 | 298 | } |
c29f74e0 | 299 | |
ac2a6666 PNA |
300 | return 0; |
301 | } | |
302 | EXPORT_SYMBOL_GPL(flow_offload_add); | |
303 | ||
8b3646d6 PB |
304 | void flow_offload_refresh(struct nf_flowtable *flow_table, |
305 | struct flow_offload *flow) | |
306 | { | |
307 | flow->timeout = nf_flowtable_time_stamp + NF_FLOW_TIMEOUT; | |
308 | ||
309 | if (likely(!nf_flowtable_hw_offload(flow_table) || | |
310 | !test_and_clear_bit(NF_FLOW_HW_REFRESH, &flow->flags))) | |
311 | return; | |
312 | ||
313 | nf_flow_offload_add(flow_table, flow); | |
314 | } | |
315 | EXPORT_SYMBOL_GPL(flow_offload_refresh); | |
316 | ||
3e68db2f PNA |
317 | static inline bool nf_flow_has_expired(const struct flow_offload *flow) |
318 | { | |
1e5b2471 | 319 | return nf_flow_timeout_delta(flow->timeout) <= 0; |
3e68db2f PNA |
320 | } |
321 | ||
0ff90b6c FF |
322 | static void flow_offload_del(struct nf_flowtable *flow_table, |
323 | struct flow_offload *flow) | |
ac2a6666 | 324 | { |
ac2a6666 PNA |
325 | rhashtable_remove_fast(&flow_table->rhashtable, |
326 | &flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].node, | |
a268de77 | 327 | nf_flow_offload_rhash_params); |
ac2a6666 PNA |
328 | rhashtable_remove_fast(&flow_table->rhashtable, |
329 | &flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].node, | |
a268de77 | 330 | nf_flow_offload_rhash_params); |
ac2a6666 | 331 | |
b32d2f34 | 332 | clear_bit(IPS_OFFLOAD_BIT, &flow->ct->status); |
da5984e5 | 333 | |
3e68db2f | 334 | if (nf_flow_has_expired(flow)) |
b32d2f34 | 335 | flow_offload_fixup_ct(flow->ct); |
9ed81c8e | 336 | else |
b32d2f34 | 337 | flow_offload_fixup_ct_timeout(flow->ct); |
3e68db2f | 338 | |
0ff90b6c | 339 | flow_offload_free(flow); |
ac2a6666 | 340 | } |
ac2a6666 | 341 | |
59c466dd FF |
342 | void flow_offload_teardown(struct flow_offload *flow) |
343 | { | |
355a8b13 | 344 | set_bit(NF_FLOW_TEARDOWN, &flow->flags); |
da5984e5 | 345 | |
b32d2f34 | 346 | flow_offload_fixup_ct_state(flow->ct); |
59c466dd FF |
347 | } |
348 | EXPORT_SYMBOL_GPL(flow_offload_teardown); | |
349 | ||
ac2a6666 PNA |
350 | struct flow_offload_tuple_rhash * |
351 | flow_offload_lookup(struct nf_flowtable *flow_table, | |
352 | struct flow_offload_tuple *tuple) | |
353 | { | |
ba03137f FF |
354 | struct flow_offload_tuple_rhash *tuplehash; |
355 | struct flow_offload *flow; | |
356 | int dir; | |
357 | ||
a2d88182 TY |
358 | tuplehash = rhashtable_lookup(&flow_table->rhashtable, tuple, |
359 | nf_flow_offload_rhash_params); | |
ba03137f FF |
360 | if (!tuplehash) |
361 | return NULL; | |
362 | ||
363 | dir = tuplehash->tuple.dir; | |
364 | flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]); | |
355a8b13 | 365 | if (test_bit(NF_FLOW_TEARDOWN, &flow->flags)) |
ba03137f FF |
366 | return NULL; |
367 | ||
b32d2f34 | 368 | if (unlikely(nf_ct_is_dying(flow->ct))) |
8cd2bc98 TY |
369 | return NULL; |
370 | ||
ba03137f | 371 | return tuplehash; |
ac2a6666 PNA |
372 | } |
373 | EXPORT_SYMBOL_GPL(flow_offload_lookup); | |
374 | ||
49de9c09 TY |
375 | static int |
376 | nf_flow_table_iterate(struct nf_flowtable *flow_table, | |
377 | void (*iter)(struct flow_offload *flow, void *data), | |
378 | void *data) | |
ac2a6666 PNA |
379 | { |
380 | struct flow_offload_tuple_rhash *tuplehash; | |
381 | struct rhashtable_iter hti; | |
382 | struct flow_offload *flow; | |
0de22baa | 383 | int err = 0; |
ac2a6666 | 384 | |
0de22baa | 385 | rhashtable_walk_enter(&flow_table->rhashtable, &hti); |
ac2a6666 PNA |
386 | rhashtable_walk_start(&hti); |
387 | ||
388 | while ((tuplehash = rhashtable_walk_next(&hti))) { | |
389 | if (IS_ERR(tuplehash)) { | |
0de22baa TY |
390 | if (PTR_ERR(tuplehash) != -EAGAIN) { |
391 | err = PTR_ERR(tuplehash); | |
392 | break; | |
393 | } | |
ac2a6666 PNA |
394 | continue; |
395 | } | |
396 | if (tuplehash->tuple.dir) | |
397 | continue; | |
398 | ||
399 | flow = container_of(tuplehash, struct flow_offload, tuplehash[0]); | |
400 | ||
401 | iter(flow, data); | |
402 | } | |
ac2a6666 PNA |
403 | rhashtable_walk_stop(&hti); |
404 | rhashtable_walk_exit(&hti); | |
405 | ||
406 | return err; | |
407 | } | |
ac2a6666 | 408 | |
8b9229d1 PNA |
409 | static bool flow_offload_stale_dst(struct flow_offload_tuple *tuple) |
410 | { | |
411 | struct dst_entry *dst; | |
412 | ||
413 | if (tuple->xmit_type == FLOW_OFFLOAD_XMIT_NEIGH || | |
414 | tuple->xmit_type == FLOW_OFFLOAD_XMIT_XFRM) { | |
415 | dst = tuple->dst_cache; | |
416 | if (!dst_check(dst, tuple->dst_cookie)) | |
417 | return true; | |
418 | } | |
419 | ||
420 | return false; | |
421 | } | |
422 | ||
423 | static bool nf_flow_has_stale_dst(struct flow_offload *flow) | |
424 | { | |
425 | return flow_offload_stale_dst(&flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple) || | |
426 | flow_offload_stale_dst(&flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple); | |
427 | } | |
428 | ||
b9660987 | 429 | static void nf_flow_offload_gc_step(struct flow_offload *flow, void *data) |
ac2a6666 | 430 | { |
b9660987 | 431 | struct nf_flowtable *flow_table = data; |
ac2a6666 | 432 | |
8b9229d1 PNA |
433 | if (nf_flow_has_expired(flow) || |
434 | nf_ct_is_dying(flow->ct) || | |
435 | nf_flow_has_stale_dst(flow)) | |
9ed81c8e PNA |
436 | set_bit(NF_FLOW_TEARDOWN, &flow->flags); |
437 | ||
438 | if (test_bit(NF_FLOW_TEARDOWN, &flow->flags)) { | |
355a8b13 PNA |
439 | if (test_bit(NF_FLOW_HW, &flow->flags)) { |
440 | if (!test_bit(NF_FLOW_HW_DYING, &flow->flags)) | |
c29f74e0 | 441 | nf_flow_offload_del(flow_table, flow); |
355a8b13 | 442 | else if (test_bit(NF_FLOW_HW_DEAD, &flow->flags)) |
c29f74e0 PNA |
443 | flow_offload_del(flow_table, flow); |
444 | } else { | |
445 | flow_offload_del(flow_table, flow); | |
446 | } | |
355a8b13 | 447 | } else if (test_bit(NF_FLOW_HW, &flow->flags)) { |
79b9b685 | 448 | nf_flow_offload_stats(flow_table, flow); |
c29f74e0 | 449 | } |
b408c5b0 PNA |
450 | } |
451 | ||
a268de77 | 452 | static void nf_flow_offload_work_gc(struct work_struct *work) |
b408c5b0 PNA |
453 | { |
454 | struct nf_flowtable *flow_table; | |
455 | ||
456 | flow_table = container_of(work, struct nf_flowtable, gc_work.work); | |
b9660987 | 457 | nf_flow_table_iterate(flow_table, nf_flow_offload_gc_step, flow_table); |
ac2a6666 PNA |
458 | queue_delayed_work(system_power_efficient_wq, &flow_table->gc_work, HZ); |
459 | } | |
ac2a6666 | 460 | |
f4401262 PNA |
461 | static void nf_flow_nat_port_tcp(struct sk_buff *skb, unsigned int thoff, |
462 | __be16 port, __be16 new_port) | |
ac2a6666 PNA |
463 | { |
464 | struct tcphdr *tcph; | |
465 | ||
ac2a6666 | 466 | tcph = (void *)(skb_network_header(skb) + thoff); |
8d6bca15 | 467 | inet_proto_csum_replace2(&tcph->check, skb, port, new_port, false); |
ac2a6666 PNA |
468 | } |
469 | ||
f4401262 PNA |
470 | static void nf_flow_nat_port_udp(struct sk_buff *skb, unsigned int thoff, |
471 | __be16 port, __be16 new_port) | |
ac2a6666 PNA |
472 | { |
473 | struct udphdr *udph; | |
474 | ||
ac2a6666 PNA |
475 | udph = (void *)(skb_network_header(skb) + thoff); |
476 | if (udph->check || skb->ip_summed == CHECKSUM_PARTIAL) { | |
477 | inet_proto_csum_replace2(&udph->check, skb, port, | |
8d6bca15 | 478 | new_port, false); |
ac2a6666 PNA |
479 | if (!udph->check) |
480 | udph->check = CSUM_MANGLED_0; | |
481 | } | |
ac2a6666 PNA |
482 | } |
483 | ||
f4401262 PNA |
484 | static void nf_flow_nat_port(struct sk_buff *skb, unsigned int thoff, |
485 | u8 protocol, __be16 port, __be16 new_port) | |
ac2a6666 PNA |
486 | { |
487 | switch (protocol) { | |
488 | case IPPROTO_TCP: | |
f4401262 | 489 | nf_flow_nat_port_tcp(skb, thoff, port, new_port); |
ac2a6666 PNA |
490 | break; |
491 | case IPPROTO_UDP: | |
f4401262 | 492 | nf_flow_nat_port_udp(skb, thoff, port, new_port); |
ac2a6666 PNA |
493 | break; |
494 | } | |
ac2a6666 PNA |
495 | } |
496 | ||
f4401262 PNA |
497 | void nf_flow_snat_port(const struct flow_offload *flow, |
498 | struct sk_buff *skb, unsigned int thoff, | |
499 | u8 protocol, enum flow_offload_tuple_dir dir) | |
ac2a6666 PNA |
500 | { |
501 | struct flow_ports *hdr; | |
502 | __be16 port, new_port; | |
503 | ||
ac2a6666 PNA |
504 | hdr = (void *)(skb_network_header(skb) + thoff); |
505 | ||
506 | switch (dir) { | |
507 | case FLOW_OFFLOAD_DIR_ORIGINAL: | |
508 | port = hdr->source; | |
509 | new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst_port; | |
510 | hdr->source = new_port; | |
511 | break; | |
512 | case FLOW_OFFLOAD_DIR_REPLY: | |
513 | port = hdr->dest; | |
514 | new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.src_port; | |
515 | hdr->dest = new_port; | |
516 | break; | |
ac2a6666 PNA |
517 | } |
518 | ||
f4401262 | 519 | nf_flow_nat_port(skb, thoff, protocol, port, new_port); |
ac2a6666 PNA |
520 | } |
521 | EXPORT_SYMBOL_GPL(nf_flow_snat_port); | |
522 | ||
f4401262 PNA |
523 | void nf_flow_dnat_port(const struct flow_offload *flow, struct sk_buff *skb, |
524 | unsigned int thoff, u8 protocol, | |
525 | enum flow_offload_tuple_dir dir) | |
ac2a6666 PNA |
526 | { |
527 | struct flow_ports *hdr; | |
528 | __be16 port, new_port; | |
529 | ||
ac2a6666 PNA |
530 | hdr = (void *)(skb_network_header(skb) + thoff); |
531 | ||
532 | switch (dir) { | |
533 | case FLOW_OFFLOAD_DIR_ORIGINAL: | |
534 | port = hdr->dest; | |
535 | new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.src_port; | |
536 | hdr->dest = new_port; | |
537 | break; | |
538 | case FLOW_OFFLOAD_DIR_REPLY: | |
539 | port = hdr->source; | |
540 | new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.dst_port; | |
541 | hdr->source = new_port; | |
542 | break; | |
ac2a6666 PNA |
543 | } |
544 | ||
f4401262 | 545 | nf_flow_nat_port(skb, thoff, protocol, port, new_port); |
ac2a6666 PNA |
546 | } |
547 | EXPORT_SYMBOL_GPL(nf_flow_dnat_port); | |
548 | ||
a268de77 FF |
549 | int nf_flow_table_init(struct nf_flowtable *flowtable) |
550 | { | |
551 | int err; | |
552 | ||
740b486a | 553 | INIT_DELAYED_WORK(&flowtable->gc_work, nf_flow_offload_work_gc); |
c29f74e0 | 554 | flow_block_init(&flowtable->flow_block); |
422c032a | 555 | init_rwsem(&flowtable->flow_block_lock); |
a268de77 FF |
556 | |
557 | err = rhashtable_init(&flowtable->rhashtable, | |
558 | &nf_flow_offload_rhash_params); | |
559 | if (err < 0) | |
560 | return err; | |
561 | ||
562 | queue_delayed_work(system_power_efficient_wq, | |
563 | &flowtable->gc_work, HZ); | |
564 | ||
84453a90 FF |
565 | mutex_lock(&flowtable_lock); |
566 | list_add(&flowtable->list, &flowtables); | |
567 | mutex_unlock(&flowtable_lock); | |
568 | ||
a268de77 FF |
569 | return 0; |
570 | } | |
571 | EXPORT_SYMBOL_GPL(nf_flow_table_init); | |
572 | ||
c0ea1bcb PNA |
573 | static void nf_flow_table_do_cleanup(struct flow_offload *flow, void *data) |
574 | { | |
575 | struct net_device *dev = data; | |
576 | ||
59c466dd FF |
577 | if (!dev) { |
578 | flow_offload_teardown(flow); | |
c0ea1bcb | 579 | return; |
59c466dd | 580 | } |
b32d2f34 PNA |
581 | |
582 | if (net_eq(nf_ct_net(flow->ct), dev_net(dev)) && | |
a3fb3698 TY |
583 | (flow->tuplehash[0].tuple.iifidx == dev->ifindex || |
584 | flow->tuplehash[1].tuple.iifidx == dev->ifindex)) | |
445db8d0 | 585 | flow_offload_teardown(flow); |
c0ea1bcb PNA |
586 | } |
587 | ||
a8284c68 PNA |
588 | void nf_flow_table_gc_cleanup(struct nf_flowtable *flowtable, |
589 | struct net_device *dev) | |
c0ea1bcb | 590 | { |
84453a90 | 591 | nf_flow_table_iterate(flowtable, nf_flow_table_do_cleanup, dev); |
c0ea1bcb | 592 | flush_delayed_work(&flowtable->gc_work); |
91bfaa15 | 593 | nf_flow_table_offload_flush(flowtable); |
c0ea1bcb PNA |
594 | } |
595 | ||
5f1be84a | 596 | void nf_flow_table_cleanup(struct net_device *dev) |
c0ea1bcb | 597 | { |
84453a90 FF |
598 | struct nf_flowtable *flowtable; |
599 | ||
600 | mutex_lock(&flowtable_lock); | |
601 | list_for_each_entry(flowtable, &flowtables, list) | |
a8284c68 | 602 | nf_flow_table_gc_cleanup(flowtable, dev); |
84453a90 | 603 | mutex_unlock(&flowtable_lock); |
c0ea1bcb PNA |
604 | } |
605 | EXPORT_SYMBOL_GPL(nf_flow_table_cleanup); | |
606 | ||
b408c5b0 PNA |
607 | void nf_flow_table_free(struct nf_flowtable *flow_table) |
608 | { | |
84453a90 FF |
609 | mutex_lock(&flowtable_lock); |
610 | list_del(&flow_table->list); | |
611 | mutex_unlock(&flowtable_lock); | |
978703f4 | 612 | |
a268de77 | 613 | cancel_delayed_work_sync(&flow_table->gc_work); |
b408c5b0 | 614 | nf_flow_table_iterate(flow_table, nf_flow_table_do_cleanup, NULL); |
b9660987 | 615 | nf_flow_table_iterate(flow_table, nf_flow_offload_gc_step, flow_table); |
0f34f30a | 616 | nf_flow_table_offload_flush(flow_table); |
c921ffe8 PB |
617 | if (nf_flowtable_hw_offload(flow_table)) |
618 | nf_flow_table_iterate(flow_table, nf_flow_offload_gc_step, | |
619 | flow_table); | |
a268de77 | 620 | rhashtable_destroy(&flow_table->rhashtable); |
b408c5b0 PNA |
621 | } |
622 | EXPORT_SYMBOL_GPL(nf_flow_table_free); | |
623 | ||
c29f74e0 PNA |
624 | static int __init nf_flow_table_module_init(void) |
625 | { | |
626 | return nf_flow_table_offload_init(); | |
627 | } | |
628 | ||
629 | static void __exit nf_flow_table_module_exit(void) | |
630 | { | |
631 | nf_flow_table_offload_exit(); | |
632 | } | |
633 | ||
634 | module_init(nf_flow_table_module_init); | |
635 | module_exit(nf_flow_table_module_exit); | |
636 | ||
ac2a6666 PNA |
637 | MODULE_LICENSE("GPL"); |
638 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); | |
4cacc395 | 639 | MODULE_DESCRIPTION("Netfilter flow table module"); |