]>
Commit | Line | Data |
---|---|---|
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) || | |
4c8bba65 | 51 | !refcount_inc_not_zero(&ct->ct_general.use))) |
ac2a6666 PNA |
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: | |
427faee1 | 102 | flow_tuple->mtu = ip6_dst_mtu_maybe_forward(dst, true); |
f1363e05 PNA |
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 | { | |
da5984e5 FF |
176 | tcp->seen[0].td_maxwin = 0; |
177 | tcp->seen[1].td_maxwin = 0; | |
178 | } | |
179 | ||
01e0ad85 | 180 | static void flow_offload_fixup_ct(struct nf_conn *ct) |
da5984e5 | 181 | { |
1d91d2e1 | 182 | struct net *net = nf_ct_net(ct); |
1e5b2471 | 183 | int l4num = nf_ct_protonum(ct); |
4592ee7f | 184 | s32 timeout; |
da5984e5 | 185 | |
1d91d2e1 OS |
186 | if (l4num == IPPROTO_TCP) { |
187 | struct nf_tcp_net *tn = nf_tcp_pernet(net); | |
188 | ||
01e0ad85 PNA |
189 | flow_offload_fixup_tcp(&ct->proto.tcp); |
190 | ||
191 | timeout = tn->timeouts[ct->proto.tcp.state]; | |
4592ee7f | 192 | timeout -= tn->offload_timeout; |
1d91d2e1 OS |
193 | } else if (l4num == IPPROTO_UDP) { |
194 | struct nf_udp_net *tn = nf_udp_pernet(net); | |
195 | ||
4592ee7f FW |
196 | timeout = tn->timeouts[UDP_CT_REPLIED]; |
197 | timeout -= tn->offload_timeout; | |
1d91d2e1 | 198 | } else { |
da5984e5 | 199 | return; |
1d91d2e1 | 200 | } |
da5984e5 | 201 | |
4592ee7f FW |
202 | if (timeout < 0) |
203 | timeout = 0; | |
204 | ||
74e1cddd ED |
205 | if (nf_flow_timeout_delta(READ_ONCE(ct->timeout)) > (__s32)timeout) |
206 | WRITE_ONCE(ct->timeout, nfct_time_stamp + timeout); | |
1e5b2471 PNA |
207 | } |
208 | ||
f1363e05 | 209 | static void flow_offload_route_release(struct flow_offload *flow) |
ac2a6666 | 210 | { |
7a27f6ab PNA |
211 | nft_flow_dst_release(flow, FLOW_OFFLOAD_DIR_ORIGINAL); |
212 | nft_flow_dst_release(flow, FLOW_OFFLOAD_DIR_REPLY); | |
f1363e05 PNA |
213 | } |
214 | ||
215 | void flow_offload_free(struct flow_offload *flow) | |
216 | { | |
217 | switch (flow->type) { | |
218 | case NF_FLOW_OFFLOAD_ROUTE: | |
219 | flow_offload_route_release(flow); | |
220 | break; | |
221 | default: | |
222 | break; | |
223 | } | |
b32d2f34 | 224 | nf_ct_put(flow->ct); |
62248df8 | 225 | kfree_rcu(flow, rcu_head); |
ac2a6666 PNA |
226 | } |
227 | EXPORT_SYMBOL_GPL(flow_offload_free); | |
228 | ||
a268de77 FF |
229 | static u32 flow_offload_hash(const void *data, u32 len, u32 seed) |
230 | { | |
231 | const struct flow_offload_tuple *tuple = data; | |
232 | ||
dbc859d9 | 233 | return jhash(tuple, offsetof(struct flow_offload_tuple, __hash), seed); |
a268de77 FF |
234 | } |
235 | ||
236 | static u32 flow_offload_hash_obj(const void *data, u32 len, u32 seed) | |
237 | { | |
238 | const struct flow_offload_tuple_rhash *tuplehash = data; | |
239 | ||
dbc859d9 | 240 | return jhash(&tuplehash->tuple, offsetof(struct flow_offload_tuple, __hash), seed); |
a268de77 FF |
241 | } |
242 | ||
243 | static int flow_offload_hash_cmp(struct rhashtable_compare_arg *arg, | |
244 | const void *ptr) | |
245 | { | |
246 | const struct flow_offload_tuple *tuple = arg->key; | |
247 | const struct flow_offload_tuple_rhash *x = ptr; | |
248 | ||
dbc859d9 | 249 | if (memcmp(&x->tuple, tuple, offsetof(struct flow_offload_tuple, __hash))) |
a268de77 FF |
250 | return 1; |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | static const struct rhashtable_params nf_flow_offload_rhash_params = { | |
256 | .head_offset = offsetof(struct flow_offload_tuple_rhash, node), | |
257 | .hashfn = flow_offload_hash, | |
258 | .obj_hashfn = flow_offload_hash_obj, | |
259 | .obj_cmpfn = flow_offload_hash_cmp, | |
260 | .automatic_shrinking = true, | |
261 | }; | |
262 | ||
1d91d2e1 OS |
263 | unsigned long flow_offload_get_timeout(struct flow_offload *flow) |
264 | { | |
1d91d2e1 OS |
265 | unsigned long timeout = NF_FLOW_TIMEOUT; |
266 | struct net *net = nf_ct_net(flow->ct); | |
267 | int l4num = nf_ct_protonum(flow->ct); | |
268 | ||
1d91d2e1 OS |
269 | if (l4num == IPPROTO_TCP) { |
270 | struct nf_tcp_net *tn = nf_tcp_pernet(net); | |
271 | ||
272 | timeout = tn->offload_timeout; | |
273 | } else if (l4num == IPPROTO_UDP) { | |
274 | struct nf_udp_net *tn = nf_udp_pernet(net); | |
275 | ||
276 | timeout = tn->offload_timeout; | |
277 | } | |
278 | ||
279 | return timeout; | |
280 | } | |
281 | ||
ac2a6666 PNA |
282 | int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload *flow) |
283 | { | |
43c8f131 TY |
284 | int err; |
285 | ||
1d91d2e1 | 286 | flow->timeout = nf_flowtable_time_stamp + flow_offload_get_timeout(flow); |
daf61b02 | 287 | |
43c8f131 TY |
288 | err = rhashtable_insert_fast(&flow_table->rhashtable, |
289 | &flow->tuplehash[0].node, | |
290 | nf_flow_offload_rhash_params); | |
291 | if (err < 0) | |
292 | return err; | |
293 | ||
294 | err = rhashtable_insert_fast(&flow_table->rhashtable, | |
295 | &flow->tuplehash[1].node, | |
296 | nf_flow_offload_rhash_params); | |
297 | if (err < 0) { | |
298 | rhashtable_remove_fast(&flow_table->rhashtable, | |
299 | &flow->tuplehash[0].node, | |
300 | nf_flow_offload_rhash_params); | |
301 | return err; | |
302 | } | |
ac2a6666 | 303 | |
4203b19c RD |
304 | nf_ct_offload_timeout(flow->ct); |
305 | ||
f698fe40 PNA |
306 | if (nf_flowtable_hw_offload(flow_table)) { |
307 | __set_bit(NF_FLOW_HW, &flow->flags); | |
c29f74e0 | 308 | nf_flow_offload_add(flow_table, flow); |
f698fe40 | 309 | } |
c29f74e0 | 310 | |
ac2a6666 PNA |
311 | return 0; |
312 | } | |
313 | EXPORT_SYMBOL_GPL(flow_offload_add); | |
314 | ||
8b3646d6 PB |
315 | void flow_offload_refresh(struct nf_flowtable *flow_table, |
316 | struct flow_offload *flow) | |
317 | { | |
32c3973d PNA |
318 | u32 timeout; |
319 | ||
320 | timeout = nf_flowtable_time_stamp + flow_offload_get_timeout(flow); | |
8b1acf90 | 321 | if (timeout - READ_ONCE(flow->timeout) > HZ) |
32c3973d | 322 | WRITE_ONCE(flow->timeout, timeout); |
8b1acf90 FF |
323 | else |
324 | return; | |
8b3646d6 | 325 | |
c07531c0 | 326 | if (likely(!nf_flowtable_hw_offload(flow_table))) |
8b3646d6 PB |
327 | return; |
328 | ||
329 | nf_flow_offload_add(flow_table, flow); | |
330 | } | |
331 | EXPORT_SYMBOL_GPL(flow_offload_refresh); | |
332 | ||
3e68db2f PNA |
333 | static inline bool nf_flow_has_expired(const struct flow_offload *flow) |
334 | { | |
1e5b2471 | 335 | return nf_flow_timeout_delta(flow->timeout) <= 0; |
3e68db2f PNA |
336 | } |
337 | ||
0ff90b6c FF |
338 | static void flow_offload_del(struct nf_flowtable *flow_table, |
339 | struct flow_offload *flow) | |
ac2a6666 | 340 | { |
ac2a6666 PNA |
341 | rhashtable_remove_fast(&flow_table->rhashtable, |
342 | &flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].node, | |
a268de77 | 343 | nf_flow_offload_rhash_params); |
ac2a6666 PNA |
344 | rhashtable_remove_fast(&flow_table->rhashtable, |
345 | &flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].node, | |
a268de77 | 346 | nf_flow_offload_rhash_params); |
0ff90b6c | 347 | flow_offload_free(flow); |
ac2a6666 | 348 | } |
ac2a6666 | 349 | |
59c466dd FF |
350 | void flow_offload_teardown(struct flow_offload *flow) |
351 | { | |
01e0ad85 | 352 | clear_bit(IPS_OFFLOAD_BIT, &flow->ct->status); |
355a8b13 | 353 | set_bit(NF_FLOW_TEARDOWN, &flow->flags); |
01e0ad85 | 354 | flow_offload_fixup_ct(flow->ct); |
59c466dd FF |
355 | } |
356 | EXPORT_SYMBOL_GPL(flow_offload_teardown); | |
357 | ||
ac2a6666 PNA |
358 | struct flow_offload_tuple_rhash * |
359 | flow_offload_lookup(struct nf_flowtable *flow_table, | |
360 | struct flow_offload_tuple *tuple) | |
361 | { | |
ba03137f FF |
362 | struct flow_offload_tuple_rhash *tuplehash; |
363 | struct flow_offload *flow; | |
364 | int dir; | |
365 | ||
a2d88182 TY |
366 | tuplehash = rhashtable_lookup(&flow_table->rhashtable, tuple, |
367 | nf_flow_offload_rhash_params); | |
ba03137f FF |
368 | if (!tuplehash) |
369 | return NULL; | |
370 | ||
371 | dir = tuplehash->tuple.dir; | |
372 | flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]); | |
355a8b13 | 373 | if (test_bit(NF_FLOW_TEARDOWN, &flow->flags)) |
ba03137f FF |
374 | return NULL; |
375 | ||
b32d2f34 | 376 | if (unlikely(nf_ct_is_dying(flow->ct))) |
8cd2bc98 TY |
377 | return NULL; |
378 | ||
ba03137f | 379 | return tuplehash; |
ac2a6666 PNA |
380 | } |
381 | EXPORT_SYMBOL_GPL(flow_offload_lookup); | |
382 | ||
49de9c09 TY |
383 | static int |
384 | nf_flow_table_iterate(struct nf_flowtable *flow_table, | |
8e8a4ec2 PNA |
385 | void (*iter)(struct nf_flowtable *flowtable, |
386 | struct flow_offload *flow, void *data), | |
49de9c09 | 387 | void *data) |
ac2a6666 PNA |
388 | { |
389 | struct flow_offload_tuple_rhash *tuplehash; | |
390 | struct rhashtable_iter hti; | |
391 | struct flow_offload *flow; | |
0de22baa | 392 | int err = 0; |
ac2a6666 | 393 | |
0de22baa | 394 | rhashtable_walk_enter(&flow_table->rhashtable, &hti); |
ac2a6666 PNA |
395 | rhashtable_walk_start(&hti); |
396 | ||
397 | while ((tuplehash = rhashtable_walk_next(&hti))) { | |
398 | if (IS_ERR(tuplehash)) { | |
0de22baa TY |
399 | if (PTR_ERR(tuplehash) != -EAGAIN) { |
400 | err = PTR_ERR(tuplehash); | |
401 | break; | |
402 | } | |
ac2a6666 PNA |
403 | continue; |
404 | } | |
405 | if (tuplehash->tuple.dir) | |
406 | continue; | |
407 | ||
408 | flow = container_of(tuplehash, struct flow_offload, tuplehash[0]); | |
409 | ||
8e8a4ec2 | 410 | iter(flow_table, flow, data); |
ac2a6666 | 411 | } |
ac2a6666 PNA |
412 | rhashtable_walk_stop(&hti); |
413 | rhashtable_walk_exit(&hti); | |
414 | ||
415 | return err; | |
416 | } | |
ac2a6666 | 417 | |
8b9229d1 PNA |
418 | static bool flow_offload_stale_dst(struct flow_offload_tuple *tuple) |
419 | { | |
420 | struct dst_entry *dst; | |
421 | ||
422 | if (tuple->xmit_type == FLOW_OFFLOAD_XMIT_NEIGH || | |
423 | tuple->xmit_type == FLOW_OFFLOAD_XMIT_XFRM) { | |
424 | dst = tuple->dst_cache; | |
425 | if (!dst_check(dst, tuple->dst_cookie)) | |
426 | return true; | |
427 | } | |
428 | ||
429 | return false; | |
430 | } | |
431 | ||
432 | static bool nf_flow_has_stale_dst(struct flow_offload *flow) | |
433 | { | |
434 | return flow_offload_stale_dst(&flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple) || | |
435 | flow_offload_stale_dst(&flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple); | |
436 | } | |
437 | ||
8e8a4ec2 PNA |
438 | static void nf_flow_offload_gc_step(struct nf_flowtable *flow_table, |
439 | struct flow_offload *flow, void *data) | |
ac2a6666 | 440 | { |
8b9229d1 PNA |
441 | if (nf_flow_has_expired(flow) || |
442 | nf_ct_is_dying(flow->ct) || | |
443 | nf_flow_has_stale_dst(flow)) | |
01e0ad85 | 444 | flow_offload_teardown(flow); |
9ed81c8e PNA |
445 | |
446 | if (test_bit(NF_FLOW_TEARDOWN, &flow->flags)) { | |
355a8b13 PNA |
447 | if (test_bit(NF_FLOW_HW, &flow->flags)) { |
448 | if (!test_bit(NF_FLOW_HW_DYING, &flow->flags)) | |
c29f74e0 | 449 | nf_flow_offload_del(flow_table, flow); |
355a8b13 | 450 | else if (test_bit(NF_FLOW_HW_DEAD, &flow->flags)) |
c29f74e0 PNA |
451 | flow_offload_del(flow_table, flow); |
452 | } else { | |
453 | flow_offload_del(flow_table, flow); | |
454 | } | |
355a8b13 | 455 | } else if (test_bit(NF_FLOW_HW, &flow->flags)) { |
79b9b685 | 456 | nf_flow_offload_stats(flow_table, flow); |
c29f74e0 | 457 | } |
b408c5b0 PNA |
458 | } |
459 | ||
a268de77 | 460 | static void nf_flow_offload_work_gc(struct work_struct *work) |
b408c5b0 PNA |
461 | { |
462 | struct nf_flowtable *flow_table; | |
463 | ||
464 | flow_table = container_of(work, struct nf_flowtable, gc_work.work); | |
8e8a4ec2 | 465 | nf_flow_table_iterate(flow_table, nf_flow_offload_gc_step, NULL); |
ac2a6666 PNA |
466 | queue_delayed_work(system_power_efficient_wq, &flow_table->gc_work, HZ); |
467 | } | |
ac2a6666 | 468 | |
f4401262 PNA |
469 | static void nf_flow_nat_port_tcp(struct sk_buff *skb, unsigned int thoff, |
470 | __be16 port, __be16 new_port) | |
ac2a6666 PNA |
471 | { |
472 | struct tcphdr *tcph; | |
473 | ||
ac2a6666 | 474 | tcph = (void *)(skb_network_header(skb) + thoff); |
8d6bca15 | 475 | inet_proto_csum_replace2(&tcph->check, skb, port, new_port, false); |
ac2a6666 PNA |
476 | } |
477 | ||
f4401262 PNA |
478 | static void nf_flow_nat_port_udp(struct sk_buff *skb, unsigned int thoff, |
479 | __be16 port, __be16 new_port) | |
ac2a6666 PNA |
480 | { |
481 | struct udphdr *udph; | |
482 | ||
ac2a6666 PNA |
483 | udph = (void *)(skb_network_header(skb) + thoff); |
484 | if (udph->check || skb->ip_summed == CHECKSUM_PARTIAL) { | |
485 | inet_proto_csum_replace2(&udph->check, skb, port, | |
8d6bca15 | 486 | new_port, false); |
ac2a6666 PNA |
487 | if (!udph->check) |
488 | udph->check = CSUM_MANGLED_0; | |
489 | } | |
ac2a6666 PNA |
490 | } |
491 | ||
f4401262 PNA |
492 | static void nf_flow_nat_port(struct sk_buff *skb, unsigned int thoff, |
493 | u8 protocol, __be16 port, __be16 new_port) | |
ac2a6666 PNA |
494 | { |
495 | switch (protocol) { | |
496 | case IPPROTO_TCP: | |
f4401262 | 497 | nf_flow_nat_port_tcp(skb, thoff, port, new_port); |
ac2a6666 PNA |
498 | break; |
499 | case IPPROTO_UDP: | |
f4401262 | 500 | nf_flow_nat_port_udp(skb, thoff, port, new_port); |
ac2a6666 PNA |
501 | break; |
502 | } | |
ac2a6666 PNA |
503 | } |
504 | ||
f4401262 PNA |
505 | void nf_flow_snat_port(const struct flow_offload *flow, |
506 | struct sk_buff *skb, unsigned int thoff, | |
507 | u8 protocol, enum flow_offload_tuple_dir dir) | |
ac2a6666 PNA |
508 | { |
509 | struct flow_ports *hdr; | |
510 | __be16 port, new_port; | |
511 | ||
ac2a6666 PNA |
512 | hdr = (void *)(skb_network_header(skb) + thoff); |
513 | ||
514 | switch (dir) { | |
515 | case FLOW_OFFLOAD_DIR_ORIGINAL: | |
516 | port = hdr->source; | |
517 | new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst_port; | |
518 | hdr->source = new_port; | |
519 | break; | |
520 | case FLOW_OFFLOAD_DIR_REPLY: | |
521 | port = hdr->dest; | |
522 | new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.src_port; | |
523 | hdr->dest = new_port; | |
524 | break; | |
ac2a6666 PNA |
525 | } |
526 | ||
f4401262 | 527 | nf_flow_nat_port(skb, thoff, protocol, port, new_port); |
ac2a6666 PNA |
528 | } |
529 | EXPORT_SYMBOL_GPL(nf_flow_snat_port); | |
530 | ||
f4401262 PNA |
531 | void nf_flow_dnat_port(const struct flow_offload *flow, struct sk_buff *skb, |
532 | unsigned int thoff, u8 protocol, | |
533 | enum flow_offload_tuple_dir dir) | |
ac2a6666 PNA |
534 | { |
535 | struct flow_ports *hdr; | |
536 | __be16 port, new_port; | |
537 | ||
ac2a6666 PNA |
538 | hdr = (void *)(skb_network_header(skb) + thoff); |
539 | ||
540 | switch (dir) { | |
541 | case FLOW_OFFLOAD_DIR_ORIGINAL: | |
542 | port = hdr->dest; | |
543 | new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.src_port; | |
544 | hdr->dest = new_port; | |
545 | break; | |
546 | case FLOW_OFFLOAD_DIR_REPLY: | |
547 | port = hdr->source; | |
548 | new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.dst_port; | |
549 | hdr->source = new_port; | |
550 | break; | |
ac2a6666 PNA |
551 | } |
552 | ||
f4401262 | 553 | nf_flow_nat_port(skb, thoff, protocol, port, new_port); |
ac2a6666 PNA |
554 | } |
555 | EXPORT_SYMBOL_GPL(nf_flow_dnat_port); | |
556 | ||
a268de77 FF |
557 | int nf_flow_table_init(struct nf_flowtable *flowtable) |
558 | { | |
559 | int err; | |
560 | ||
740b486a | 561 | INIT_DELAYED_WORK(&flowtable->gc_work, nf_flow_offload_work_gc); |
c29f74e0 | 562 | flow_block_init(&flowtable->flow_block); |
422c032a | 563 | init_rwsem(&flowtable->flow_block_lock); |
a268de77 FF |
564 | |
565 | err = rhashtable_init(&flowtable->rhashtable, | |
566 | &nf_flow_offload_rhash_params); | |
567 | if (err < 0) | |
568 | return err; | |
569 | ||
570 | queue_delayed_work(system_power_efficient_wq, | |
571 | &flowtable->gc_work, HZ); | |
572 | ||
84453a90 FF |
573 | mutex_lock(&flowtable_lock); |
574 | list_add(&flowtable->list, &flowtables); | |
575 | mutex_unlock(&flowtable_lock); | |
576 | ||
a268de77 FF |
577 | return 0; |
578 | } | |
579 | EXPORT_SYMBOL_GPL(nf_flow_table_init); | |
580 | ||
8e8a4ec2 PNA |
581 | static void nf_flow_table_do_cleanup(struct nf_flowtable *flow_table, |
582 | struct flow_offload *flow, void *data) | |
c0ea1bcb PNA |
583 | { |
584 | struct net_device *dev = data; | |
585 | ||
59c466dd FF |
586 | if (!dev) { |
587 | flow_offload_teardown(flow); | |
c0ea1bcb | 588 | return; |
59c466dd | 589 | } |
b32d2f34 PNA |
590 | |
591 | if (net_eq(nf_ct_net(flow->ct), dev_net(dev)) && | |
a3fb3698 TY |
592 | (flow->tuplehash[0].tuple.iifidx == dev->ifindex || |
593 | flow->tuplehash[1].tuple.iifidx == dev->ifindex)) | |
445db8d0 | 594 | flow_offload_teardown(flow); |
c0ea1bcb PNA |
595 | } |
596 | ||
a8284c68 PNA |
597 | void nf_flow_table_gc_cleanup(struct nf_flowtable *flowtable, |
598 | struct net_device *dev) | |
c0ea1bcb | 599 | { |
84453a90 | 600 | nf_flow_table_iterate(flowtable, nf_flow_table_do_cleanup, dev); |
c0ea1bcb | 601 | flush_delayed_work(&flowtable->gc_work); |
91bfaa15 | 602 | nf_flow_table_offload_flush(flowtable); |
c0ea1bcb PNA |
603 | } |
604 | ||
5f1be84a | 605 | void nf_flow_table_cleanup(struct net_device *dev) |
c0ea1bcb | 606 | { |
84453a90 FF |
607 | struct nf_flowtable *flowtable; |
608 | ||
609 | mutex_lock(&flowtable_lock); | |
610 | list_for_each_entry(flowtable, &flowtables, list) | |
a8284c68 | 611 | nf_flow_table_gc_cleanup(flowtable, dev); |
84453a90 | 612 | mutex_unlock(&flowtable_lock); |
c0ea1bcb PNA |
613 | } |
614 | EXPORT_SYMBOL_GPL(nf_flow_table_cleanup); | |
615 | ||
b408c5b0 PNA |
616 | void nf_flow_table_free(struct nf_flowtable *flow_table) |
617 | { | |
84453a90 FF |
618 | mutex_lock(&flowtable_lock); |
619 | list_del(&flow_table->list); | |
620 | mutex_unlock(&flowtable_lock); | |
978703f4 | 621 | |
a268de77 | 622 | cancel_delayed_work_sync(&flow_table->gc_work); |
b408c5b0 | 623 | nf_flow_table_iterate(flow_table, nf_flow_table_do_cleanup, NULL); |
8e8a4ec2 | 624 | nf_flow_table_iterate(flow_table, nf_flow_offload_gc_step, NULL); |
0f34f30a | 625 | nf_flow_table_offload_flush(flow_table); |
c921ffe8 | 626 | if (nf_flowtable_hw_offload(flow_table)) |
8e8a4ec2 | 627 | nf_flow_table_iterate(flow_table, nf_flow_offload_gc_step, NULL); |
a268de77 | 628 | rhashtable_destroy(&flow_table->rhashtable); |
b408c5b0 PNA |
629 | } |
630 | EXPORT_SYMBOL_GPL(nf_flow_table_free); | |
631 | ||
c29f74e0 PNA |
632 | static int __init nf_flow_table_module_init(void) |
633 | { | |
634 | return nf_flow_table_offload_init(); | |
635 | } | |
636 | ||
637 | static void __exit nf_flow_table_module_exit(void) | |
638 | { | |
639 | nf_flow_table_offload_exit(); | |
640 | } | |
641 | ||
642 | module_init(nf_flow_table_module_init); | |
643 | module_exit(nf_flow_table_module_exit); | |
644 | ||
ac2a6666 PNA |
645 | MODULE_LICENSE("GPL"); |
646 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); | |
4cacc395 | 647 | MODULE_DESCRIPTION("Netfilter flow table module"); |