1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2 /* -
3 * net/sched/act_ct.c Connection Tracking action
4 *
5 * Authors: Paul Blakey <paulb@mellanox.com>
6 * Yossi Kuperman <yossiku@mellanox.com>
7 * Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
8 */
9
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/skbuff.h>
14 #include <linux/rtnetlink.h>
15 #include <linux/pkt_cls.h>
16 #include <linux/if_tunnel.h>
17 #include <linux/ip.h>
18 #include <linux/ipv6.h>
19 #include <linux/rhashtable.h>
20 #include <net/gre.h>
21 #include <net/netlink.h>
22 #include <net/pkt_sched.h>
23 #include <net/pkt_cls.h>
24 #include <net/act_api.h>
25 #include <net/ip.h>
26 #include <net/ipv6_frag.h>
27 #include <uapi/linux/tc_act/tc_ct.h>
28 #include <net/tc_act/tc_ct.h>
29 #include <net/tc_wrapper.h>
30
31 #include <net/netfilter/nf_flow_table.h>
32 #include <net/netfilter/nf_conntrack.h>
33 #include <net/netfilter/nf_conntrack_core.h>
34 #include <net/netfilter/nf_conntrack_zones.h>
35 #include <net/netfilter/nf_conntrack_helper.h>
36 #include <net/netfilter/nf_conntrack_acct.h>
37 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
38 #include <net/netfilter/nf_conntrack_act_ct.h>
39 #include <net/netfilter/nf_conntrack_seqadj.h>
40 #include <uapi/linux/netfilter/nf_nat.h>
41
42 static struct workqueue_struct *act_ct_wq;
43 static struct rhashtable zones_ht;
44 static DEFINE_MUTEX(zones_mutex);
45
46 struct zones_ht_key {
47 struct net *net;
48 u16 zone;
49 };
50
51 struct tcf_ct_flow_table {
52 struct rhash_head node; /* In zones tables */
53
54 struct rcu_work rwork;
55 struct nf_flowtable nf_ft;
56 refcount_t ref;
57 struct zones_ht_key key;
58
59 bool dying;
60 };
61
62 static const struct rhashtable_params zones_params = {
63 .head_offset = offsetof(struct tcf_ct_flow_table, node),
64 .key_offset = offsetof(struct tcf_ct_flow_table, key),
65 .key_len = offsetofend(struct zones_ht_key, zone),
66 .automatic_shrinking = true,
67 };
68
69 static struct flow_action_entry *
tcf_ct_flow_table_flow_action_get_next(struct flow_action * flow_action)70 tcf_ct_flow_table_flow_action_get_next(struct flow_action *flow_action)
71 {
72 int i = flow_action->num_entries++;
73
74 return &flow_action->entries[i];
75 }
76
tcf_ct_add_mangle_action(struct flow_action * action,enum flow_action_mangle_base htype,u32 offset,u32 mask,u32 val)77 static void tcf_ct_add_mangle_action(struct flow_action *action,
78 enum flow_action_mangle_base htype,
79 u32 offset,
80 u32 mask,
81 u32 val)
82 {
83 struct flow_action_entry *entry;
84
85 entry = tcf_ct_flow_table_flow_action_get_next(action);
86 entry->id = FLOW_ACTION_MANGLE;
87 entry->mangle.htype = htype;
88 entry->mangle.mask = ~mask;
89 entry->mangle.offset = offset;
90 entry->mangle.val = val;
91 }
92
93 /* The following nat helper functions check if the inverted reverse tuple
94 * (target) is different then the current dir tuple - meaning nat for ports
95 * and/or ip is needed, and add the relevant mangle actions.
96 */
97 static void
tcf_ct_flow_table_add_action_nat_ipv4(const struct nf_conntrack_tuple * tuple,struct nf_conntrack_tuple target,struct flow_action * action)98 tcf_ct_flow_table_add_action_nat_ipv4(const struct nf_conntrack_tuple *tuple,
99 struct nf_conntrack_tuple target,
100 struct flow_action *action)
101 {
102 if (memcmp(&target.src.u3, &tuple->src.u3, sizeof(target.src.u3)))
103 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_IP4,
104 offsetof(struct iphdr, saddr),
105 0xFFFFFFFF,
106 be32_to_cpu(target.src.u3.ip));
107 if (memcmp(&target.dst.u3, &tuple->dst.u3, sizeof(target.dst.u3)))
108 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_IP4,
109 offsetof(struct iphdr, daddr),
110 0xFFFFFFFF,
111 be32_to_cpu(target.dst.u3.ip));
112 }
113
114 static void
tcf_ct_add_ipv6_addr_mangle_action(struct flow_action * action,union nf_inet_addr * addr,u32 offset)115 tcf_ct_add_ipv6_addr_mangle_action(struct flow_action *action,
116 union nf_inet_addr *addr,
117 u32 offset)
118 {
119 int i;
120
121 for (i = 0; i < sizeof(struct in6_addr) / sizeof(u32); i++)
122 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_IP6,
123 i * sizeof(u32) + offset,
124 0xFFFFFFFF, be32_to_cpu(addr->ip6[i]));
125 }
126
127 static void
tcf_ct_flow_table_add_action_nat_ipv6(const struct nf_conntrack_tuple * tuple,struct nf_conntrack_tuple target,struct flow_action * action)128 tcf_ct_flow_table_add_action_nat_ipv6(const struct nf_conntrack_tuple *tuple,
129 struct nf_conntrack_tuple target,
130 struct flow_action *action)
131 {
132 if (memcmp(&target.src.u3, &tuple->src.u3, sizeof(target.src.u3)))
133 tcf_ct_add_ipv6_addr_mangle_action(action, &target.src.u3,
134 offsetof(struct ipv6hdr,
135 saddr));
136 if (memcmp(&target.dst.u3, &tuple->dst.u3, sizeof(target.dst.u3)))
137 tcf_ct_add_ipv6_addr_mangle_action(action, &target.dst.u3,
138 offsetof(struct ipv6hdr,
139 daddr));
140 }
141
142 static void
tcf_ct_flow_table_add_action_nat_tcp(const struct nf_conntrack_tuple * tuple,struct nf_conntrack_tuple target,struct flow_action * action)143 tcf_ct_flow_table_add_action_nat_tcp(const struct nf_conntrack_tuple *tuple,
144 struct nf_conntrack_tuple target,
145 struct flow_action *action)
146 {
147 __be16 target_src = target.src.u.tcp.port;
148 __be16 target_dst = target.dst.u.tcp.port;
149
150 if (target_src != tuple->src.u.tcp.port)
151 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_TCP,
152 offsetof(struct tcphdr, source),
153 0xFFFF, be16_to_cpu(target_src));
154 if (target_dst != tuple->dst.u.tcp.port)
155 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_TCP,
156 offsetof(struct tcphdr, dest),
157 0xFFFF, be16_to_cpu(target_dst));
158 }
159
160 static void
tcf_ct_flow_table_add_action_nat_udp(const struct nf_conntrack_tuple * tuple,struct nf_conntrack_tuple target,struct flow_action * action)161 tcf_ct_flow_table_add_action_nat_udp(const struct nf_conntrack_tuple *tuple,
162 struct nf_conntrack_tuple target,
163 struct flow_action *action)
164 {
165 __be16 target_src = target.src.u.udp.port;
166 __be16 target_dst = target.dst.u.udp.port;
167
168 if (target_src != tuple->src.u.udp.port)
169 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_UDP,
170 offsetof(struct udphdr, source),
171 0xFFFF, be16_to_cpu(target_src));
172 if (target_dst != tuple->dst.u.udp.port)
173 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_UDP,
174 offsetof(struct udphdr, dest),
175 0xFFFF, be16_to_cpu(target_dst));
176 }
177
tcf_ct_flow_table_add_action_meta(struct nf_conn * ct,enum ip_conntrack_dir dir,enum ip_conntrack_info ctinfo,struct flow_action * action)178 static void tcf_ct_flow_table_add_action_meta(struct nf_conn *ct,
179 enum ip_conntrack_dir dir,
180 enum ip_conntrack_info ctinfo,
181 struct flow_action *action)
182 {
183 struct nf_conn_labels *ct_labels;
184 struct flow_action_entry *entry;
185 u32 *act_ct_labels;
186
187 entry = tcf_ct_flow_table_flow_action_get_next(action);
188 entry->id = FLOW_ACTION_CT_METADATA;
189 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
190 entry->ct_metadata.mark = READ_ONCE(ct->mark);
191 #endif
192 /* aligns with the CT reference on the SKB nf_ct_set */
193 entry->ct_metadata.cookie = (unsigned long)ct | ctinfo;
194 entry->ct_metadata.orig_dir = dir == IP_CT_DIR_ORIGINAL;
195
196 act_ct_labels = entry->ct_metadata.labels;
197 ct_labels = nf_ct_labels_find(ct);
198 if (ct_labels)
199 memcpy(act_ct_labels, ct_labels->bits, NF_CT_LABELS_MAX_SIZE);
200 else
201 memset(act_ct_labels, 0, NF_CT_LABELS_MAX_SIZE);
202 }
203
tcf_ct_flow_table_add_action_nat(struct net * net,struct nf_conn * ct,enum ip_conntrack_dir dir,struct flow_action * action)204 static int tcf_ct_flow_table_add_action_nat(struct net *net,
205 struct nf_conn *ct,
206 enum ip_conntrack_dir dir,
207 struct flow_action *action)
208 {
209 const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple;
210 struct nf_conntrack_tuple target;
211
212 if (!(ct->status & IPS_NAT_MASK))
213 return 0;
214
215 nf_ct_invert_tuple(&target, &ct->tuplehash[!dir].tuple);
216
217 switch (tuple->src.l3num) {
218 case NFPROTO_IPV4:
219 tcf_ct_flow_table_add_action_nat_ipv4(tuple, target,
220 action);
221 break;
222 case NFPROTO_IPV6:
223 tcf_ct_flow_table_add_action_nat_ipv6(tuple, target,
224 action);
225 break;
226 default:
227 return -EOPNOTSUPP;
228 }
229
230 switch (nf_ct_protonum(ct)) {
231 case IPPROTO_TCP:
232 tcf_ct_flow_table_add_action_nat_tcp(tuple, target, action);
233 break;
234 case IPPROTO_UDP:
235 tcf_ct_flow_table_add_action_nat_udp(tuple, target, action);
236 break;
237 default:
238 return -EOPNOTSUPP;
239 }
240
241 return 0;
242 }
243
tcf_ct_flow_table_fill_actions(struct net * net,struct flow_offload * flow,enum flow_offload_tuple_dir tdir,struct nf_flow_rule * flow_rule)244 static int tcf_ct_flow_table_fill_actions(struct net *net,
245 struct flow_offload *flow,
246 enum flow_offload_tuple_dir tdir,
247 struct nf_flow_rule *flow_rule)
248 {
249 struct flow_action *action = &flow_rule->rule->action;
250 int num_entries = action->num_entries;
251 struct nf_conn *ct = flow->ct;
252 enum ip_conntrack_info ctinfo;
253 enum ip_conntrack_dir dir;
254 int i, err;
255
256 switch (tdir) {
257 case FLOW_OFFLOAD_DIR_ORIGINAL:
258 dir = IP_CT_DIR_ORIGINAL;
259 ctinfo = test_bit(IPS_SEEN_REPLY_BIT, &ct->status) ?
260 IP_CT_ESTABLISHED : IP_CT_NEW;
261 if (ctinfo == IP_CT_ESTABLISHED)
262 set_bit(NF_FLOW_HW_ESTABLISHED, &flow->flags);
263 break;
264 case FLOW_OFFLOAD_DIR_REPLY:
265 dir = IP_CT_DIR_REPLY;
266 ctinfo = IP_CT_ESTABLISHED_REPLY;
267 break;
268 default:
269 return -EOPNOTSUPP;
270 }
271
272 err = tcf_ct_flow_table_add_action_nat(net, ct, dir, action);
273 if (err)
274 goto err_nat;
275
276 tcf_ct_flow_table_add_action_meta(ct, dir, ctinfo, action);
277 return 0;
278
279 err_nat:
280 /* Clear filled actions */
281 for (i = num_entries; i < action->num_entries; i++)
282 memset(&action->entries[i], 0, sizeof(action->entries[i]));
283 action->num_entries = num_entries;
284
285 return err;
286 }
287
tcf_ct_flow_is_outdated(const struct flow_offload * flow)288 static bool tcf_ct_flow_is_outdated(const struct flow_offload *flow)
289 {
290 return test_bit(IPS_SEEN_REPLY_BIT, &flow->ct->status) &&
291 test_bit(IPS_HW_OFFLOAD_BIT, &flow->ct->status) &&
292 !test_bit(NF_FLOW_HW_PENDING, &flow->flags) &&
293 !test_bit(NF_FLOW_HW_ESTABLISHED, &flow->flags);
294 }
295
296 static void tcf_ct_flow_table_get_ref(struct tcf_ct_flow_table *ct_ft);
297
tcf_ct_nf_get(struct nf_flowtable * ft)298 static void tcf_ct_nf_get(struct nf_flowtable *ft)
299 {
300 struct tcf_ct_flow_table *ct_ft =
301 container_of(ft, struct tcf_ct_flow_table, nf_ft);
302
303 tcf_ct_flow_table_get_ref(ct_ft);
304 }
305
306 static void tcf_ct_flow_table_put(struct tcf_ct_flow_table *ct_ft);
307
tcf_ct_nf_put(struct nf_flowtable * ft)308 static void tcf_ct_nf_put(struct nf_flowtable *ft)
309 {
310 struct tcf_ct_flow_table *ct_ft =
311 container_of(ft, struct tcf_ct_flow_table, nf_ft);
312
313 tcf_ct_flow_table_put(ct_ft);
314 }
315
316 static struct nf_flowtable_type flowtable_ct = {
317 .gc = tcf_ct_flow_is_outdated,
318 .action = tcf_ct_flow_table_fill_actions,
319 .get = tcf_ct_nf_get,
320 .put = tcf_ct_nf_put,
321 .owner = THIS_MODULE,
322 };
323
tcf_ct_flow_table_get(struct net * net,struct tcf_ct_params * params)324 static int tcf_ct_flow_table_get(struct net *net, struct tcf_ct_params *params)
325 {
326 struct zones_ht_key key = { .net = net, .zone = params->zone };
327 struct tcf_ct_flow_table *ct_ft;
328 int err = -ENOMEM;
329
330 mutex_lock(&zones_mutex);
331 rcu_read_lock();
332 ct_ft = rhashtable_lookup(&zones_ht, &key, zones_params);
333 if (ct_ft && refcount_inc_not_zero(&ct_ft->ref)) {
334 rcu_read_unlock();
335 goto out_unlock;
336 }
337 rcu_read_unlock();
338
339 ct_ft = kzalloc_obj(*ct_ft);
340 if (!ct_ft)
341 goto err_alloc;
342 refcount_set(&ct_ft->ref, 1);
343
344 ct_ft->key = key;
345 err = rhashtable_insert_fast(&zones_ht, &ct_ft->node, zones_params);
346 if (err)
347 goto err_insert;
348
349 ct_ft->nf_ft.type = &flowtable_ct;
350 ct_ft->nf_ft.flags |= NF_FLOWTABLE_HW_OFFLOAD |
351 NF_FLOWTABLE_COUNTER;
352 err = nf_flow_table_init(&ct_ft->nf_ft);
353 if (err)
354 goto err_init;
355 write_pnet(&ct_ft->nf_ft.net, net);
356
357 __module_get(THIS_MODULE);
358 out_unlock:
359 params->ct_ft = ct_ft;
360 params->nf_ft = &ct_ft->nf_ft;
361 mutex_unlock(&zones_mutex);
362
363 return 0;
364
365 err_init:
366 rhashtable_remove_fast(&zones_ht, &ct_ft->node, zones_params);
367 err_insert:
368 kfree(ct_ft);
369 err_alloc:
370 mutex_unlock(&zones_mutex);
371 return err;
372 }
373
tcf_ct_flow_table_get_ref(struct tcf_ct_flow_table * ct_ft)374 static void tcf_ct_flow_table_get_ref(struct tcf_ct_flow_table *ct_ft)
375 {
376 refcount_inc(&ct_ft->ref);
377 }
378
tcf_ct_flow_table_cleanup_work(struct work_struct * work)379 static void tcf_ct_flow_table_cleanup_work(struct work_struct *work)
380 {
381 struct tcf_ct_flow_table *ct_ft;
382 struct flow_block *block;
383
384 ct_ft = container_of(to_rcu_work(work), struct tcf_ct_flow_table,
385 rwork);
386 nf_flow_table_free(&ct_ft->nf_ft);
387
388 block = &ct_ft->nf_ft.flow_block;
389 down_write(&ct_ft->nf_ft.flow_block_lock);
390 WARN_ON(!list_empty(&block->cb_list));
391 up_write(&ct_ft->nf_ft.flow_block_lock);
392 kfree(ct_ft);
393
394 module_put(THIS_MODULE);
395 }
396
tcf_ct_flow_table_put(struct tcf_ct_flow_table * ct_ft)397 static void tcf_ct_flow_table_put(struct tcf_ct_flow_table *ct_ft)
398 {
399 if (refcount_dec_and_test(&ct_ft->ref)) {
400 rhashtable_remove_fast(&zones_ht, &ct_ft->node, zones_params);
401 INIT_RCU_WORK(&ct_ft->rwork, tcf_ct_flow_table_cleanup_work);
402 queue_rcu_work(act_ct_wq, &ct_ft->rwork);
403 }
404 }
405
tcf_ct_flow_tc_ifidx(struct flow_offload * entry,struct nf_conn_act_ct_ext * act_ct_ext,u8 dir)406 static void tcf_ct_flow_tc_ifidx(struct flow_offload *entry,
407 struct nf_conn_act_ct_ext *act_ct_ext, u8 dir)
408 {
409 entry->tuplehash[dir].tuple.xmit_type = FLOW_OFFLOAD_XMIT_TC;
410 entry->tuplehash[dir].tuple.tc.iifidx = act_ct_ext->ifindex[dir];
411 }
412
tcf_ct_flow_ct_ext_ifidx_update(struct flow_offload * entry)413 static void tcf_ct_flow_ct_ext_ifidx_update(struct flow_offload *entry)
414 {
415 struct nf_conn_act_ct_ext *act_ct_ext;
416
417 act_ct_ext = nf_conn_act_ct_ext_find(entry->ct);
418 if (act_ct_ext) {
419 tcf_ct_flow_tc_ifidx(entry, act_ct_ext, FLOW_OFFLOAD_DIR_ORIGINAL);
420 tcf_ct_flow_tc_ifidx(entry, act_ct_ext, FLOW_OFFLOAD_DIR_REPLY);
421 }
422 }
423
tcf_ct_flow_table_add(struct tcf_ct_flow_table * ct_ft,struct nf_conn * ct,bool tcp,bool bidirectional)424 static void tcf_ct_flow_table_add(struct tcf_ct_flow_table *ct_ft,
425 struct nf_conn *ct,
426 bool tcp, bool bidirectional)
427 {
428 struct nf_conn_act_ct_ext *act_ct_ext;
429 struct flow_offload *entry;
430 int err;
431
432 if (test_and_set_bit(IPS_OFFLOAD_BIT, &ct->status))
433 return;
434
435 /* NULL if ct is dying (raced flush) or the atomic alloc failed. */
436 entry = flow_offload_alloc(ct);
437 if (!entry)
438 goto err_alloc;
439
440 if (tcp) {
441 ct->proto.tcp.seen[0].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
442 ct->proto.tcp.seen[1].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
443 }
444 if (bidirectional)
445 __set_bit(NF_FLOW_HW_BIDIRECTIONAL, &entry->flags);
446
447 act_ct_ext = nf_conn_act_ct_ext_find(ct);
448 if (act_ct_ext) {
449 tcf_ct_flow_tc_ifidx(entry, act_ct_ext, FLOW_OFFLOAD_DIR_ORIGINAL);
450 tcf_ct_flow_tc_ifidx(entry, act_ct_ext, FLOW_OFFLOAD_DIR_REPLY);
451 }
452
453 err = flow_offload_add(&ct_ft->nf_ft, entry);
454 if (err)
455 goto err_add;
456
457 return;
458
459 err_add:
460 flow_offload_free(entry);
461 err_alloc:
462 clear_bit(IPS_OFFLOAD_BIT, &ct->status);
463 }
464
tcf_ct_flow_table_process_conn(struct tcf_ct_flow_table * ct_ft,struct nf_conn * ct,enum ip_conntrack_info ctinfo)465 static void tcf_ct_flow_table_process_conn(struct tcf_ct_flow_table *ct_ft,
466 struct nf_conn *ct,
467 enum ip_conntrack_info ctinfo)
468 {
469 bool tcp = false, bidirectional = true;
470
471 switch (nf_ct_protonum(ct)) {
472 case IPPROTO_TCP:
473 if ((ctinfo != IP_CT_ESTABLISHED &&
474 ctinfo != IP_CT_ESTABLISHED_REPLY) ||
475 !test_bit(IPS_ASSURED_BIT, &ct->status) ||
476 ct->proto.tcp.state != TCP_CONNTRACK_ESTABLISHED)
477 return;
478
479 tcp = true;
480 break;
481 case IPPROTO_UDP:
482 if (!nf_ct_is_confirmed(ct))
483 return;
484 if (!test_bit(IPS_ASSURED_BIT, &ct->status))
485 bidirectional = false;
486 break;
487 #ifdef CONFIG_NF_CT_PROTO_GRE
488 case IPPROTO_GRE: {
489 struct nf_conntrack_tuple *tuple;
490
491 if ((ctinfo != IP_CT_ESTABLISHED &&
492 ctinfo != IP_CT_ESTABLISHED_REPLY) ||
493 !test_bit(IPS_ASSURED_BIT, &ct->status) ||
494 ct->status & IPS_NAT_MASK)
495 return;
496
497 tuple = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
498 /* No support for GRE v1 */
499 if (tuple->src.u.gre.key || tuple->dst.u.gre.key)
500 return;
501 break;
502 }
503 #endif
504 default:
505 return;
506 }
507
508 if (nf_ct_ext_exist(ct, NF_CT_EXT_HELPER) ||
509 ct->status & IPS_SEQ_ADJUST)
510 return;
511
512 tcf_ct_flow_table_add(ct_ft, ct, tcp, bidirectional);
513 }
514
515 static bool
tcf_ct_flow_table_fill_tuple_ipv4(struct sk_buff * skb,struct flow_offload_tuple * tuple,struct tcphdr ** tcph)516 tcf_ct_flow_table_fill_tuple_ipv4(struct sk_buff *skb,
517 struct flow_offload_tuple *tuple,
518 struct tcphdr **tcph)
519 {
520 struct flow_ports *ports;
521 unsigned int thoff;
522 struct iphdr *iph;
523 size_t hdrsize;
524 u8 ipproto;
525
526 if (!pskb_network_may_pull(skb, sizeof(*iph)))
527 return false;
528
529 iph = ip_hdr(skb);
530 thoff = iph->ihl * 4;
531
532 if (ip_is_fragment(iph) ||
533 unlikely(thoff != sizeof(struct iphdr)))
534 return false;
535
536 ipproto = iph->protocol;
537 switch (ipproto) {
538 case IPPROTO_TCP:
539 hdrsize = sizeof(struct tcphdr);
540 break;
541 case IPPROTO_UDP:
542 hdrsize = sizeof(*ports);
543 break;
544 #ifdef CONFIG_NF_CT_PROTO_GRE
545 case IPPROTO_GRE:
546 hdrsize = sizeof(struct gre_base_hdr);
547 break;
548 #endif
549 default:
550 return false;
551 }
552
553 if (iph->ttl <= 1)
554 return false;
555
556 if (!pskb_network_may_pull(skb, thoff + hdrsize))
557 return false;
558
559 switch (ipproto) {
560 case IPPROTO_TCP:
561 *tcph = (void *)(skb_network_header(skb) + thoff);
562 fallthrough;
563 case IPPROTO_UDP:
564 ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
565 tuple->src_port = ports->source;
566 tuple->dst_port = ports->dest;
567 break;
568 case IPPROTO_GRE: {
569 struct gre_base_hdr *greh;
570
571 greh = (struct gre_base_hdr *)(skb_network_header(skb) + thoff);
572 if ((greh->flags & GRE_VERSION) != GRE_VERSION_0)
573 return false;
574 break;
575 }
576 }
577
578 iph = ip_hdr(skb);
579
580 tuple->src_v4.s_addr = iph->saddr;
581 tuple->dst_v4.s_addr = iph->daddr;
582 tuple->l3proto = AF_INET;
583 tuple->l4proto = ipproto;
584
585 return true;
586 }
587
588 static bool
tcf_ct_flow_table_fill_tuple_ipv6(struct sk_buff * skb,struct flow_offload_tuple * tuple,struct tcphdr ** tcph)589 tcf_ct_flow_table_fill_tuple_ipv6(struct sk_buff *skb,
590 struct flow_offload_tuple *tuple,
591 struct tcphdr **tcph)
592 {
593 struct flow_ports *ports;
594 struct ipv6hdr *ip6h;
595 unsigned int thoff;
596 size_t hdrsize;
597 u8 nexthdr;
598
599 if (!pskb_network_may_pull(skb, sizeof(*ip6h)))
600 return false;
601
602 ip6h = ipv6_hdr(skb);
603 thoff = sizeof(*ip6h);
604
605 nexthdr = ip6h->nexthdr;
606 switch (nexthdr) {
607 case IPPROTO_TCP:
608 hdrsize = sizeof(struct tcphdr);
609 break;
610 case IPPROTO_UDP:
611 hdrsize = sizeof(*ports);
612 break;
613 #ifdef CONFIG_NF_CT_PROTO_GRE
614 case IPPROTO_GRE:
615 hdrsize = sizeof(struct gre_base_hdr);
616 break;
617 #endif
618 default:
619 return false;
620 }
621
622 if (ip6h->hop_limit <= 1)
623 return false;
624
625 if (!pskb_network_may_pull(skb, thoff + hdrsize))
626 return false;
627
628 switch (nexthdr) {
629 case IPPROTO_TCP:
630 *tcph = (void *)(skb_network_header(skb) + thoff);
631 fallthrough;
632 case IPPROTO_UDP:
633 ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
634 tuple->src_port = ports->source;
635 tuple->dst_port = ports->dest;
636 break;
637 case IPPROTO_GRE: {
638 struct gre_base_hdr *greh;
639
640 greh = (struct gre_base_hdr *)(skb_network_header(skb) + thoff);
641 if ((greh->flags & GRE_VERSION) != GRE_VERSION_0)
642 return false;
643 break;
644 }
645 }
646
647 ip6h = ipv6_hdr(skb);
648
649 tuple->src_v6 = ip6h->saddr;
650 tuple->dst_v6 = ip6h->daddr;
651 tuple->l3proto = AF_INET6;
652 tuple->l4proto = nexthdr;
653
654 return true;
655 }
656
tcf_ct_flow_table_lookup(struct tcf_ct_params * p,struct sk_buff * skb,u8 family)657 static bool tcf_ct_flow_table_lookup(struct tcf_ct_params *p,
658 struct sk_buff *skb,
659 u8 family)
660 {
661 struct nf_flowtable *nf_ft = &p->ct_ft->nf_ft;
662 struct flow_offload_tuple_rhash *tuplehash;
663 struct flow_offload_tuple tuple = {};
664 enum ip_conntrack_info ctinfo;
665 struct tcphdr *tcph = NULL;
666 bool force_refresh = false;
667 struct flow_offload *flow;
668 struct nf_conn *ct;
669 u8 dir;
670
671 switch (family) {
672 case NFPROTO_IPV4:
673 if (!tcf_ct_flow_table_fill_tuple_ipv4(skb, &tuple, &tcph))
674 return false;
675 break;
676 case NFPROTO_IPV6:
677 if (!tcf_ct_flow_table_fill_tuple_ipv6(skb, &tuple, &tcph))
678 return false;
679 break;
680 default:
681 return false;
682 }
683
684 tuplehash = flow_offload_lookup(nf_ft, &tuple);
685 if (!tuplehash)
686 return false;
687
688 dir = tuplehash->tuple.dir;
689 flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]);
690 ct = flow->ct;
691
692 if (dir == FLOW_OFFLOAD_DIR_REPLY &&
693 !test_bit(NF_FLOW_HW_BIDIRECTIONAL, &flow->flags)) {
694 /* Only offload reply direction after connection became
695 * assured.
696 */
697 if (test_bit(IPS_ASSURED_BIT, &ct->status))
698 set_bit(NF_FLOW_HW_BIDIRECTIONAL, &flow->flags);
699 else if (test_bit(NF_FLOW_HW_ESTABLISHED, &flow->flags))
700 /* If flow_table flow has already been updated to the
701 * established state, then don't refresh.
702 */
703 return false;
704 force_refresh = true;
705 }
706
707 if (tcph && (unlikely(tcph->fin || tcph->rst))) {
708 flow_offload_teardown(flow);
709 return false;
710 }
711
712 if (dir == FLOW_OFFLOAD_DIR_ORIGINAL)
713 ctinfo = test_bit(IPS_SEEN_REPLY_BIT, &ct->status) ?
714 IP_CT_ESTABLISHED : IP_CT_NEW;
715 else
716 ctinfo = IP_CT_ESTABLISHED_REPLY;
717
718 nf_conn_act_ct_ext_fill(skb, ct, ctinfo);
719 tcf_ct_flow_ct_ext_ifidx_update(flow);
720 flow_offload_refresh(nf_ft, flow, force_refresh);
721 if (!test_bit(IPS_ASSURED_BIT, &ct->status)) {
722 /* Process this flow in SW to allow promoting to ASSURED */
723 return false;
724 }
725
726 nf_conntrack_get(&ct->ct_general);
727 nf_ct_set(skb, ct, ctinfo);
728 if (nf_ft->flags & NF_FLOWTABLE_COUNTER)
729 nf_ct_acct_update(ct, dir, skb->len);
730
731 return true;
732 }
733
tcf_ct_flow_tables_init(void)734 static int tcf_ct_flow_tables_init(void)
735 {
736 return rhashtable_init(&zones_ht, &zones_params);
737 }
738
tcf_ct_flow_tables_uninit(void)739 static void tcf_ct_flow_tables_uninit(void)
740 {
741 rhashtable_destroy(&zones_ht);
742 }
743
744 static struct tc_action_ops act_ct_ops;
745
746 struct tc_ct_action_net {
747 struct tc_action_net tn; /* Must be first */
748 };
749
750 /* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
tcf_ct_skb_nfct_cached(struct net * net,struct sk_buff * skb,struct tcf_ct_params * p)751 static bool tcf_ct_skb_nfct_cached(struct net *net, struct sk_buff *skb,
752 struct tcf_ct_params *p)
753 {
754 enum ip_conntrack_info ctinfo;
755 struct nf_conn *ct;
756
757 ct = nf_ct_get(skb, &ctinfo);
758 if (!ct)
759 return false;
760 if (!net_eq(net, read_pnet(&ct->ct_net)))
761 goto drop_ct;
762 if (nf_ct_zone(ct)->id != p->zone)
763 goto drop_ct;
764 if (p->helper) {
765 struct nf_conn_help *help;
766
767 help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
768 if (help && rcu_access_pointer(help->helper) != p->helper)
769 goto drop_ct;
770 }
771
772 /* Force conntrack entry direction. */
773 if ((p->ct_action & TCA_CT_ACT_FORCE) &&
774 CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
775 if (nf_ct_is_confirmed(ct))
776 nf_ct_kill(ct);
777
778 goto drop_ct;
779 }
780
781 return true;
782
783 drop_ct:
784 nf_reset_ct(skb);
785 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
786
787 return false;
788 }
789
tcf_ct_skb_nf_family(struct sk_buff * skb)790 static u8 tcf_ct_skb_nf_family(struct sk_buff *skb)
791 {
792 u8 family = NFPROTO_UNSPEC;
793
794 switch (skb_protocol(skb, true)) {
795 case htons(ETH_P_IP):
796 family = NFPROTO_IPV4;
797 break;
798 case htons(ETH_P_IPV6):
799 family = NFPROTO_IPV6;
800 break;
801 default:
802 break;
803 }
804
805 return family;
806 }
807
tcf_ct_ipv4_is_fragment(struct sk_buff * skb,bool * frag)808 static int tcf_ct_ipv4_is_fragment(struct sk_buff *skb, bool *frag)
809 {
810 unsigned int len;
811
812 len = skb_network_offset(skb) + sizeof(struct iphdr);
813 if (unlikely(skb->len < len))
814 return -EINVAL;
815 if (unlikely(!pskb_may_pull(skb, len)))
816 return -ENOMEM;
817
818 *frag = ip_is_fragment(ip_hdr(skb));
819 return 0;
820 }
821
tcf_ct_ipv6_is_fragment(struct sk_buff * skb,bool * frag)822 static int tcf_ct_ipv6_is_fragment(struct sk_buff *skb, bool *frag)
823 {
824 unsigned int flags = 0, len, payload_ofs = 0;
825 unsigned short frag_off;
826 int nexthdr;
827
828 len = skb_network_offset(skb) + sizeof(struct ipv6hdr);
829 if (unlikely(skb->len < len))
830 return -EINVAL;
831 if (unlikely(!pskb_may_pull(skb, len)))
832 return -ENOMEM;
833
834 nexthdr = ipv6_find_hdr(skb, &payload_ofs, -1, &frag_off, &flags);
835 if (unlikely(nexthdr < 0))
836 return -EPROTO;
837
838 *frag = flags & IP6_FH_F_FRAG;
839 return 0;
840 }
841
842 /* On error, tells the caller whether it still owns @skb and must free it
843 * itself. @skb is ours only when the header checks below reject the packet
844 * before it is handed to the defragmentation engine; once nf_ct_handle_
845 * fragments() has been called the skb is either queued (-EINPROGRESS) or has
846 * already been freed by it.
847 */
tcf_ct_handle_fragments(struct net * net,struct sk_buff * skb,u8 family,u16 zone,bool * defrag,bool * skb_is_ours)848 static int tcf_ct_handle_fragments(struct net *net, struct sk_buff *skb,
849 u8 family, u16 zone, bool *defrag,
850 bool *skb_is_ours)
851 {
852 enum ip_conntrack_info ctinfo;
853 struct tc_skb_cb cb;
854 struct nf_conn *ct;
855 int err = 0;
856 bool frag;
857 u8 proto;
858
859 /* Previously seen (loopback)? Ignore. */
860 ct = nf_ct_get(skb, &ctinfo);
861 if ((ct && !nf_ct_is_template(ct)) || ctinfo == IP_CT_UNTRACKED)
862 return 0;
863
864 if (family == NFPROTO_IPV4)
865 err = tcf_ct_ipv4_is_fragment(skb, &frag);
866 else
867 err = tcf_ct_ipv6_is_fragment(skb, &frag);
868 if (err) {
869 *skb_is_ours = true;
870 return err;
871 }
872 if (!frag)
873 return 0;
874
875 cb = *tc_skb_cb(skb);
876 err = nf_ct_handle_fragments(net, skb, zone, family, &proto, &cb.mru);
877 if (err)
878 return err;
879
880 *defrag = true;
881 *tc_skb_cb(skb) = cb;
882
883 return 0;
884 }
885
tcf_ct_params_free(struct tcf_ct_params * params)886 static void tcf_ct_params_free(struct tcf_ct_params *params)
887 {
888 if (params->helper) {
889 #if IS_ENABLED(CONFIG_NF_NAT)
890 if (params->ct_action & TCA_CT_ACT_NAT)
891 nf_nat_helper_put(params->helper);
892 #endif
893 nf_conntrack_helper_put(params->helper);
894 }
895 if (params->ct_ft)
896 tcf_ct_flow_table_put(params->ct_ft);
897 if (params->tmpl) {
898 if (params->put_labels)
899 nf_connlabels_put(nf_ct_net(params->tmpl));
900
901 nf_ct_put(params->tmpl);
902 }
903
904 kfree(params);
905 }
906
tcf_ct_params_free_rcu(struct rcu_head * head)907 static void tcf_ct_params_free_rcu(struct rcu_head *head)
908 {
909 struct tcf_ct_params *params;
910
911 params = container_of(head, struct tcf_ct_params, rcu);
912 tcf_ct_params_free(params);
913 }
914
tcf_ct_act_set_mark(struct nf_conn * ct,u32 mark,u32 mask)915 static void tcf_ct_act_set_mark(struct nf_conn *ct, u32 mark, u32 mask)
916 {
917 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
918 u32 new_mark;
919
920 if (!mask)
921 return;
922
923 new_mark = mark | (READ_ONCE(ct->mark) & ~(mask));
924 if (READ_ONCE(ct->mark) != new_mark) {
925 WRITE_ONCE(ct->mark, new_mark);
926 if (nf_ct_is_confirmed(ct))
927 nf_conntrack_event_cache(IPCT_MARK, ct);
928 }
929 #endif
930 }
931
tcf_ct_act_set_labels(struct nf_conn * ct,u32 * labels,u32 * labels_m)932 static void tcf_ct_act_set_labels(struct nf_conn *ct,
933 u32 *labels,
934 u32 *labels_m)
935 {
936 #if IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)
937 size_t labels_sz = sizeof_field(struct tcf_ct_params, labels);
938
939 if (!memchr_inv(labels_m, 0, labels_sz))
940 return;
941
942 nf_connlabels_replace(ct, labels, labels_m, 4);
943 #endif
944 }
945
tcf_ct_act_nat(struct sk_buff * skb,struct nf_conn * ct,enum ip_conntrack_info ctinfo,int ct_action,struct nf_nat_range2 * range,bool commit)946 static int tcf_ct_act_nat(struct sk_buff *skb,
947 struct nf_conn *ct,
948 enum ip_conntrack_info ctinfo,
949 int ct_action,
950 struct nf_nat_range2 *range,
951 bool commit)
952 {
953 #if IS_ENABLED(CONFIG_NF_NAT)
954 int err, action = 0;
955
956 if (!(ct_action & TCA_CT_ACT_NAT))
957 return NF_ACCEPT;
958 if (ct_action & TCA_CT_ACT_NAT_SRC)
959 action |= BIT(NF_NAT_MANIP_SRC);
960 if (ct_action & TCA_CT_ACT_NAT_DST)
961 action |= BIT(NF_NAT_MANIP_DST);
962
963 err = nf_ct_nat(skb, ct, ctinfo, &action, range, commit);
964 if (err != NF_ACCEPT)
965 return err & NF_VERDICT_MASK;
966
967 if (action & BIT(NF_NAT_MANIP_SRC))
968 qdisc_skb_cb(skb)->post_ct_snat = 1;
969 if (action & BIT(NF_NAT_MANIP_DST))
970 qdisc_skb_cb(skb)->post_ct_dnat = 1;
971
972 return err;
973 #else
974 return NF_ACCEPT;
975 #endif
976 }
977
tcf_ct_act(struct sk_buff * skb,const struct tc_action * a,struct tcf_result * res)978 TC_INDIRECT_SCOPE int tcf_ct_act(struct sk_buff *skb, const struct tc_action *a,
979 struct tcf_result *res)
980 {
981 struct net *net = dev_net(skb->dev);
982 bool cached, commit, clear, nat;
983 enum ip_conntrack_info ctinfo;
984 struct tcf_ct *c = to_ct(a);
985 struct nf_conn *tmpl = NULL;
986 struct nf_hook_state state;
987 int nh_ofs, err, retval;
988 struct tcf_ct_params *p;
989 bool skb_is_ours = false;
990 bool skip_add = false;
991 bool defrag = false;
992 struct nf_conn *ct;
993 u8 family;
994
995 p = rcu_dereference_bh(c->params);
996
997 retval = p->action;
998 commit = p->ct_action & TCA_CT_ACT_COMMIT;
999 clear = p->ct_action & TCA_CT_ACT_CLEAR;
1000 nat = p->ct_action & TCA_CT_ACT_NAT;
1001 tmpl = p->tmpl;
1002
1003 tcf_lastuse_update(&c->tcf_tm);
1004 tcf_action_update_bstats(&c->common, skb);
1005
1006 if (clear) {
1007 qdisc_skb_cb(skb)->post_ct = false;
1008 ct = nf_ct_get(skb, &ctinfo);
1009 if (ct) {
1010 nf_reset_ct(skb);
1011 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1012 }
1013
1014 goto out_clear;
1015 }
1016
1017 family = tcf_ct_skb_nf_family(skb);
1018 if (family == NFPROTO_UNSPEC)
1019 goto drop;
1020
1021 /* The conntrack module expects to be working at L3.
1022 * We also try to pull the IPv4/6 header to linear area
1023 */
1024 nh_ofs = skb_network_offset(skb);
1025 skb_pull_rcsum(skb, nh_ofs);
1026 err = tcf_ct_handle_fragments(net, skb, family, p->zone, &defrag,
1027 &skb_is_ours);
1028 if (err) {
1029 /* The skb is still ours only when the header checks rejected
1030 * it; returning TC_ACT_CONSUMED for such a packet would leak
1031 * it, since no caller frees an skb it was told it no longer
1032 * owns.
1033 */
1034 if (skb_is_ours)
1035 goto drop;
1036 goto out_frag;
1037 }
1038
1039 err = nf_ct_skb_network_trim(skb, family);
1040 if (err)
1041 goto drop;
1042
1043 /* If we are recirculating packets to match on ct fields and
1044 * committing with a separate ct action, then we don't need to
1045 * actually run the packet through conntrack twice unless it's for a
1046 * different zone.
1047 */
1048 cached = tcf_ct_skb_nfct_cached(net, skb, p);
1049
1050 /* If the ct entry is not confirmed and shared with some other skb,
1051 * e.g., a cloned one, we can't just modify it with a commit or nat
1052 * as we must not modify the extension set. Reset.
1053 */
1054 if (cached && (commit || nat)) {
1055 ct = nf_ct_get(skb, &ctinfo);
1056 if (ct && !nf_ct_is_confirmed(ct) && nf_ct_shared(ct)) {
1057 nf_reset_ct(skb);
1058 cached = false;
1059 }
1060 }
1061
1062 if (!cached) {
1063 if (tcf_ct_flow_table_lookup(p, skb, family)) {
1064 skip_add = true;
1065 goto do_nat;
1066 }
1067
1068 /* Associate skb with specified zone. */
1069 if (tmpl) {
1070 nf_reset_ct(skb);
1071 nf_conntrack_get(&tmpl->ct_general);
1072 nf_ct_set(skb, tmpl, IP_CT_NEW);
1073 }
1074
1075 state.hook = NF_INET_PRE_ROUTING;
1076 state.net = net;
1077 state.pf = family;
1078 err = nf_conntrack_in(skb, &state);
1079 if (err != NF_ACCEPT)
1080 goto nf_error;
1081 }
1082
1083 do_nat:
1084 ct = nf_ct_get(skb, &ctinfo);
1085 if (!ct)
1086 goto out_push;
1087 nf_ct_deliver_cached_events(ct);
1088 nf_conn_act_ct_ext_fill(skb, ct, ctinfo);
1089
1090 err = tcf_ct_act_nat(skb, ct, ctinfo, p->ct_action, &p->range, commit);
1091 if (err != NF_ACCEPT)
1092 goto nf_error;
1093
1094 if (!nf_ct_is_confirmed(ct) && commit && p->helper && !nfct_help(ct)) {
1095 err = __nf_ct_try_assign_helper(ct, p->tmpl, GFP_ATOMIC);
1096 if (err)
1097 goto drop;
1098
1099 if (nat && !nfct_seqadj(ct)) {
1100 if (!nfct_seqadj_ext_add(ct))
1101 goto drop;
1102 }
1103 }
1104
1105 if (commit) {
1106 tcf_ct_act_set_mark(ct, p->mark, p->mark_mask);
1107 tcf_ct_act_set_labels(ct, p->labels, p->labels_mask);
1108
1109 if (!nf_ct_is_confirmed(ct))
1110 nf_conn_act_ct_ext_add(skb, ct, ctinfo);
1111 }
1112
1113 /* Run helpers for the connection if nf_conntrack_in() was executed
1114 * or if we're about to commit. This has to be done after all the
1115 * extensions are already added.
1116 */
1117 if (nf_ct_is_confirmed(ct) ? (!cached && !skip_add) : commit) {
1118 err = nf_ct_helper(skb, ct, ctinfo, family);
1119 if (err != NF_ACCEPT)
1120 goto nf_error;
1121 }
1122
1123 if (commit) {
1124 /* This will take care of sending queued events
1125 * even if the connection is already confirmed.
1126 */
1127 err = nf_conntrack_confirm(skb);
1128 if (err != NF_ACCEPT)
1129 goto nf_error;
1130
1131 /* The ct may be dropped if a clash has been resolved,
1132 * so it's necessary to retrieve it from skb again to
1133 * prevent UAF.
1134 */
1135 ct = nf_ct_get(skb, &ctinfo);
1136 if (!ct)
1137 skip_add = true;
1138 }
1139
1140 if (!skip_add)
1141 tcf_ct_flow_table_process_conn(p->ct_ft, ct, ctinfo);
1142
1143 out_push:
1144 skb_push_rcsum(skb, nh_ofs);
1145
1146 qdisc_skb_cb(skb)->post_ct = true;
1147 tc_skb_cb(skb)->zone = p->zone;
1148 out_clear:
1149 if (defrag)
1150 qdisc_skb_cb(skb)->pkt_len = skb->len;
1151 return retval;
1152
1153 out_frag:
1154 if (err != -EINPROGRESS)
1155 tcf_action_inc_drop_qstats(&c->common);
1156 return TC_ACT_CONSUMED;
1157
1158 drop:
1159 tcf_action_inc_drop_qstats(&c->common);
1160 return TC_ACT_SHOT;
1161
1162 nf_error:
1163 /* some verdicts store extra data in upper bits, such
1164 * as errno or queue number.
1165 */
1166 switch (err & NF_VERDICT_MASK) {
1167 case NF_DROP:
1168 goto drop;
1169 case NF_STOLEN:
1170 tcf_action_inc_drop_qstats(&c->common);
1171 return TC_ACT_CONSUMED;
1172 default:
1173 DEBUG_NET_WARN_ON_ONCE(1);
1174 goto drop;
1175 }
1176 }
1177
1178 static const struct nla_policy ct_policy[TCA_CT_MAX + 1] = {
1179 [TCA_CT_ACTION] = { .type = NLA_U16 },
1180 [TCA_CT_PARMS] = NLA_POLICY_EXACT_LEN(sizeof(struct tc_ct)),
1181 [TCA_CT_ZONE] = { .type = NLA_U16 },
1182 [TCA_CT_MARK] = { .type = NLA_U32 },
1183 [TCA_CT_MARK_MASK] = { .type = NLA_U32 },
1184 [TCA_CT_LABELS] = { .type = NLA_BINARY,
1185 .len = 128 / BITS_PER_BYTE },
1186 [TCA_CT_LABELS_MASK] = { .type = NLA_BINARY,
1187 .len = 128 / BITS_PER_BYTE },
1188 [TCA_CT_NAT_IPV4_MIN] = { .type = NLA_U32 },
1189 [TCA_CT_NAT_IPV4_MAX] = { .type = NLA_U32 },
1190 [TCA_CT_NAT_IPV6_MIN] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
1191 [TCA_CT_NAT_IPV6_MAX] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
1192 [TCA_CT_NAT_PORT_MIN] = { .type = NLA_U16 },
1193 [TCA_CT_NAT_PORT_MAX] = { .type = NLA_U16 },
1194 [TCA_CT_HELPER_NAME] = { .type = NLA_STRING, .len = NF_CT_HELPER_NAME_LEN },
1195 [TCA_CT_HELPER_FAMILY] = { .type = NLA_U8 },
1196 [TCA_CT_HELPER_PROTO] = { .type = NLA_U8 },
1197 };
1198
tcf_ct_fill_params_nat(struct tcf_ct_params * p,struct tc_ct * parm,struct nlattr ** tb,struct netlink_ext_ack * extack)1199 static int tcf_ct_fill_params_nat(struct tcf_ct_params *p,
1200 struct tc_ct *parm,
1201 struct nlattr **tb,
1202 struct netlink_ext_ack *extack)
1203 {
1204 struct nf_nat_range2 *range;
1205
1206 if (!(p->ct_action & TCA_CT_ACT_NAT))
1207 return 0;
1208
1209 if (!IS_ENABLED(CONFIG_NF_NAT)) {
1210 NL_SET_ERR_MSG_MOD(extack, "Netfilter nat isn't enabled in kernel");
1211 return -EOPNOTSUPP;
1212 }
1213
1214 if (!(p->ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST)))
1215 return 0;
1216
1217 if ((p->ct_action & TCA_CT_ACT_NAT_SRC) &&
1218 (p->ct_action & TCA_CT_ACT_NAT_DST)) {
1219 NL_SET_ERR_MSG_MOD(extack, "dnat and snat can't be enabled at the same time");
1220 return -EOPNOTSUPP;
1221 }
1222
1223 range = &p->range;
1224 if (tb[TCA_CT_NAT_IPV4_MIN]) {
1225 struct nlattr *max_attr = tb[TCA_CT_NAT_IPV4_MAX];
1226
1227 p->ipv4_range = true;
1228 range->flags |= NF_NAT_RANGE_MAP_IPS;
1229 range->min_addr.ip =
1230 nla_get_in_addr(tb[TCA_CT_NAT_IPV4_MIN]);
1231
1232 range->max_addr.ip =
1233 nla_get_in_addr_default(max_attr, range->min_addr.ip);
1234 } else if (tb[TCA_CT_NAT_IPV6_MIN]) {
1235 struct nlattr *max_attr = tb[TCA_CT_NAT_IPV6_MAX];
1236
1237 p->ipv4_range = false;
1238 range->flags |= NF_NAT_RANGE_MAP_IPS;
1239 range->min_addr.in6 =
1240 nla_get_in6_addr(tb[TCA_CT_NAT_IPV6_MIN]);
1241
1242 range->max_addr.in6 = max_attr ?
1243 nla_get_in6_addr(max_attr) :
1244 range->min_addr.in6;
1245 }
1246
1247 if (tb[TCA_CT_NAT_PORT_MIN]) {
1248 range->flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
1249 range->min_proto.all = nla_get_be16(tb[TCA_CT_NAT_PORT_MIN]);
1250
1251 range->max_proto.all = tb[TCA_CT_NAT_PORT_MAX] ?
1252 nla_get_be16(tb[TCA_CT_NAT_PORT_MAX]) :
1253 range->min_proto.all;
1254 }
1255
1256 return 0;
1257 }
1258
tcf_ct_set_key_val(struct nlattr ** tb,void * val,int val_type,void * mask,int mask_type,int len)1259 static void tcf_ct_set_key_val(struct nlattr **tb,
1260 void *val, int val_type,
1261 void *mask, int mask_type,
1262 int len)
1263 {
1264 if (!tb[val_type])
1265 return;
1266 nla_memcpy(val, tb[val_type], len);
1267
1268 if (!mask)
1269 return;
1270
1271 if (mask_type == TCA_CT_UNSPEC || !tb[mask_type])
1272 memset(mask, 0xff, len);
1273 else
1274 nla_memcpy(mask, tb[mask_type], len);
1275 }
1276
tcf_ct_fill_params(struct net * net,struct tcf_ct_params * p,struct tc_ct * parm,struct nlattr ** tb,struct netlink_ext_ack * extack)1277 static int tcf_ct_fill_params(struct net *net,
1278 struct tcf_ct_params *p,
1279 struct tc_ct *parm,
1280 struct nlattr **tb,
1281 struct netlink_ext_ack *extack)
1282 {
1283 struct nf_conntrack_zone zone;
1284 int err, family, proto, len;
1285 bool put_labels = false;
1286 struct nf_conn *tmpl;
1287 char *name;
1288
1289 p->zone = NF_CT_DEFAULT_ZONE_ID;
1290
1291 tcf_ct_set_key_val(tb,
1292 &p->ct_action, TCA_CT_ACTION,
1293 NULL, TCA_CT_UNSPEC,
1294 sizeof(p->ct_action));
1295
1296 if (p->ct_action & TCA_CT_ACT_CLEAR)
1297 return 0;
1298
1299 err = tcf_ct_fill_params_nat(p, parm, tb, extack);
1300 if (err)
1301 return err;
1302
1303 if (tb[TCA_CT_MARK]) {
1304 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)) {
1305 NL_SET_ERR_MSG_MOD(extack, "Conntrack mark isn't enabled.");
1306 return -EOPNOTSUPP;
1307 }
1308 tcf_ct_set_key_val(tb,
1309 &p->mark, TCA_CT_MARK,
1310 &p->mark_mask, TCA_CT_MARK_MASK,
1311 sizeof(p->mark));
1312 }
1313
1314 if (tb[TCA_CT_LABELS]) {
1315 unsigned int n_bits = sizeof_field(struct tcf_ct_params, labels) * 8;
1316
1317 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)) {
1318 NL_SET_ERR_MSG_MOD(extack, "Conntrack labels isn't enabled.");
1319 return -EOPNOTSUPP;
1320 }
1321
1322 if (nf_connlabels_get(net, n_bits - 1)) {
1323 NL_SET_ERR_MSG_MOD(extack, "Failed to set connlabel length");
1324 return -EOPNOTSUPP;
1325 } else {
1326 put_labels = true;
1327 }
1328
1329 tcf_ct_set_key_val(tb,
1330 p->labels, TCA_CT_LABELS,
1331 p->labels_mask, TCA_CT_LABELS_MASK,
1332 sizeof(p->labels));
1333 }
1334
1335 if (tb[TCA_CT_ZONE]) {
1336 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES)) {
1337 NL_SET_ERR_MSG_MOD(extack, "Conntrack zones isn't enabled.");
1338 err = -EOPNOTSUPP;
1339 goto err;
1340 }
1341
1342 tcf_ct_set_key_val(tb,
1343 &p->zone, TCA_CT_ZONE,
1344 NULL, TCA_CT_UNSPEC,
1345 sizeof(p->zone));
1346 }
1347
1348 nf_ct_zone_init(&zone, p->zone, NF_CT_DEFAULT_ZONE_DIR, 0);
1349 tmpl = nf_ct_tmpl_alloc(net, &zone, GFP_KERNEL);
1350 if (!tmpl) {
1351 NL_SET_ERR_MSG_MOD(extack, "Failed to allocate conntrack template");
1352 err = -ENOMEM;
1353 goto err;
1354 }
1355 p->tmpl = tmpl;
1356 if (tb[TCA_CT_HELPER_NAME]) {
1357 name = nla_data(tb[TCA_CT_HELPER_NAME]);
1358 len = nla_len(tb[TCA_CT_HELPER_NAME]);
1359 if (len > 16 || name[len - 1] != '\0') {
1360 NL_SET_ERR_MSG_MOD(extack, "Failed to parse helper name.");
1361 err = -EINVAL;
1362 goto err;
1363 }
1364 family = nla_get_u8_default(tb[TCA_CT_HELPER_FAMILY], AF_INET);
1365 proto = nla_get_u8_default(tb[TCA_CT_HELPER_PROTO],
1366 IPPROTO_TCP);
1367 err = nf_ct_add_helper(tmpl, name, family, proto,
1368 p->ct_action & TCA_CT_ACT_NAT, &p->helper);
1369 if (err) {
1370 NL_SET_ERR_MSG_MOD(extack, "Failed to add helper");
1371 goto err;
1372 }
1373 }
1374
1375 p->put_labels = put_labels;
1376
1377 if (p->ct_action & TCA_CT_ACT_COMMIT)
1378 __set_bit(IPS_CONFIRMED_BIT, &tmpl->status);
1379 return 0;
1380 err:
1381 if (put_labels)
1382 nf_connlabels_put(net);
1383
1384 nf_ct_put(p->tmpl);
1385 p->tmpl = NULL;
1386 return err;
1387 }
1388
tcf_ct_init(struct net * net,struct nlattr * nla,struct nlattr * est,struct tc_action ** a,struct tcf_proto * tp,u32 flags,struct netlink_ext_ack * extack)1389 static int tcf_ct_init(struct net *net, struct nlattr *nla,
1390 struct nlattr *est, struct tc_action **a,
1391 struct tcf_proto *tp, u32 flags,
1392 struct netlink_ext_ack *extack)
1393 {
1394 struct tc_action_net *tn = net_generic(net, act_ct_ops.net_id);
1395 bool bind = flags & TCA_ACT_FLAGS_BIND;
1396 struct tcf_ct_params *params = NULL;
1397 struct nlattr *tb[TCA_CT_MAX + 1];
1398 struct tcf_chain *goto_ch = NULL;
1399 struct tc_ct *parm;
1400 struct tcf_ct *c;
1401 int err, res = 0;
1402 u32 index;
1403
1404 if (!nla) {
1405 NL_SET_ERR_MSG_MOD(extack, "Ct requires attributes to be passed");
1406 return -EINVAL;
1407 }
1408
1409 if (bind && !(flags & TCA_ACT_FLAGS_AT_INGRESS_OR_CLSACT)) {
1410 NL_SET_ERR_MSG_MOD(extack,
1411 "Attaching ct to a non ingress/clsact qdisc is unsupported");
1412 return -EOPNOTSUPP;
1413 }
1414
1415 err = nla_parse_nested(tb, TCA_CT_MAX, nla, ct_policy, extack);
1416 if (err < 0)
1417 return err;
1418
1419 if (!tb[TCA_CT_PARMS]) {
1420 NL_SET_ERR_MSG_MOD(extack, "Missing required ct parameters");
1421 return -EINVAL;
1422 }
1423 parm = nla_data(tb[TCA_CT_PARMS]);
1424 index = parm->index;
1425 err = tcf_idr_check_alloc(tn, &index, a, bind);
1426 if (err < 0)
1427 return err;
1428
1429 if (!err) {
1430 err = tcf_idr_create_from_flags(tn, index, est, a,
1431 &act_ct_ops, bind, flags);
1432 if (err) {
1433 tcf_idr_cleanup(tn, index);
1434 return err;
1435 }
1436 res = ACT_P_CREATED;
1437 } else {
1438 if (bind)
1439 return ACT_P_BOUND;
1440
1441 if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
1442 tcf_idr_release(*a, bind);
1443 return -EEXIST;
1444 }
1445 }
1446 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
1447 if (err < 0)
1448 goto cleanup;
1449
1450 c = to_ct(*a);
1451
1452 params = kzalloc_obj(*params);
1453 if (unlikely(!params)) {
1454 err = -ENOMEM;
1455 goto cleanup;
1456 }
1457
1458 err = tcf_ct_fill_params(net, params, parm, tb, extack);
1459 if (err)
1460 goto cleanup;
1461
1462 err = tcf_ct_flow_table_get(net, params);
1463 if (err)
1464 goto cleanup;
1465
1466 params->action = parm->action;
1467 spin_lock_bh(&c->tcf_lock);
1468 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
1469 params = rcu_replace_pointer(c->params, params,
1470 lockdep_is_held(&c->tcf_lock));
1471 spin_unlock_bh(&c->tcf_lock);
1472
1473 if (goto_ch)
1474 tcf_chain_put_by_act(goto_ch);
1475 if (params)
1476 call_rcu(¶ms->rcu, tcf_ct_params_free_rcu);
1477
1478 return res;
1479
1480 cleanup:
1481 if (goto_ch)
1482 tcf_chain_put_by_act(goto_ch);
1483 if (params)
1484 tcf_ct_params_free(params);
1485 tcf_idr_release(*a, bind);
1486 return err;
1487 }
1488
tcf_ct_cleanup(struct tc_action * a)1489 static void tcf_ct_cleanup(struct tc_action *a)
1490 {
1491 struct tcf_ct_params *params;
1492 struct tcf_ct *c = to_ct(a);
1493
1494 params = rcu_dereference_protected(c->params, 1);
1495 if (params)
1496 call_rcu(¶ms->rcu, tcf_ct_params_free_rcu);
1497 }
1498
tcf_ct_dump_key_val(struct sk_buff * skb,const void * val,int val_type,const void * mask,int mask_type,int len)1499 static int tcf_ct_dump_key_val(struct sk_buff *skb,
1500 const void *val, int val_type,
1501 const void *mask, int mask_type,
1502 int len)
1503 {
1504 int err;
1505
1506 if (mask && !memchr_inv(mask, 0, len))
1507 return 0;
1508
1509 err = nla_put(skb, val_type, len, val);
1510 if (err)
1511 return err;
1512
1513 if (mask_type != TCA_CT_UNSPEC) {
1514 err = nla_put(skb, mask_type, len, mask);
1515 if (err)
1516 return err;
1517 }
1518
1519 return 0;
1520 }
1521
tcf_ct_dump_nat(struct sk_buff * skb,const struct tcf_ct_params * p)1522 static int tcf_ct_dump_nat(struct sk_buff *skb, const struct tcf_ct_params *p)
1523 {
1524 const struct nf_nat_range2 *range = &p->range;
1525
1526 if (!(p->ct_action & TCA_CT_ACT_NAT))
1527 return 0;
1528
1529 if (!(p->ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST)))
1530 return 0;
1531
1532 if (range->flags & NF_NAT_RANGE_MAP_IPS) {
1533 if (p->ipv4_range) {
1534 if (nla_put_in_addr(skb, TCA_CT_NAT_IPV4_MIN,
1535 range->min_addr.ip))
1536 return -1;
1537 if (nla_put_in_addr(skb, TCA_CT_NAT_IPV4_MAX,
1538 range->max_addr.ip))
1539 return -1;
1540 } else {
1541 if (nla_put_in6_addr(skb, TCA_CT_NAT_IPV6_MIN,
1542 &range->min_addr.in6))
1543 return -1;
1544 if (nla_put_in6_addr(skb, TCA_CT_NAT_IPV6_MAX,
1545 &range->max_addr.in6))
1546 return -1;
1547 }
1548 }
1549
1550 if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
1551 if (nla_put_be16(skb, TCA_CT_NAT_PORT_MIN,
1552 range->min_proto.all))
1553 return -1;
1554 if (nla_put_be16(skb, TCA_CT_NAT_PORT_MAX,
1555 range->max_proto.all))
1556 return -1;
1557 }
1558
1559 return 0;
1560 }
1561
tcf_ct_dump_helper(struct sk_buff * skb,const struct nf_conntrack_helper * helper)1562 static int tcf_ct_dump_helper(struct sk_buff *skb,
1563 const struct nf_conntrack_helper *helper)
1564 {
1565 if (!helper)
1566 return 0;
1567
1568 if (nla_put_string(skb, TCA_CT_HELPER_NAME, helper->name) ||
1569 nla_put_u8(skb, TCA_CT_HELPER_FAMILY, helper->nfproto) ||
1570 nla_put_u8(skb, TCA_CT_HELPER_PROTO, helper->l4proto))
1571 return -1;
1572
1573 return 0;
1574 }
1575
tcf_ct_dump(struct sk_buff * skb,struct tc_action * a,int bind,int ref)1576 static inline int tcf_ct_dump(struct sk_buff *skb, struct tc_action *a,
1577 int bind, int ref)
1578 {
1579 unsigned char *b = skb_tail_pointer(skb);
1580 const struct tcf_ct *c = to_ct(a);
1581 const struct tcf_ct_params *p;
1582 struct tc_ct opt = {
1583 .index = c->tcf_index,
1584 .refcnt = refcount_read(&c->tcf_refcnt) - ref,
1585 .bindcnt = atomic_read(&c->tcf_bindcnt) - bind,
1586 };
1587 struct tcf_t t;
1588
1589 rcu_read_lock();
1590 p = rcu_dereference(c->params);
1591 opt.action = p->action;
1592
1593 if (tcf_ct_dump_key_val(skb,
1594 &p->ct_action, TCA_CT_ACTION,
1595 NULL, TCA_CT_UNSPEC,
1596 sizeof(p->ct_action)))
1597 goto nla_put_failure;
1598
1599 if (p->ct_action & TCA_CT_ACT_CLEAR)
1600 goto skip_dump;
1601
1602 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
1603 tcf_ct_dump_key_val(skb,
1604 &p->mark, TCA_CT_MARK,
1605 &p->mark_mask, TCA_CT_MARK_MASK,
1606 sizeof(p->mark)))
1607 goto nla_put_failure;
1608
1609 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1610 tcf_ct_dump_key_val(skb,
1611 p->labels, TCA_CT_LABELS,
1612 p->labels_mask, TCA_CT_LABELS_MASK,
1613 sizeof(p->labels)))
1614 goto nla_put_failure;
1615
1616 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
1617 tcf_ct_dump_key_val(skb,
1618 &p->zone, TCA_CT_ZONE,
1619 NULL, TCA_CT_UNSPEC,
1620 sizeof(p->zone)))
1621 goto nla_put_failure;
1622
1623 if (tcf_ct_dump_nat(skb, p))
1624 goto nla_put_failure;
1625
1626 if (tcf_ct_dump_helper(skb, p->helper))
1627 goto nla_put_failure;
1628
1629 skip_dump:
1630 if (nla_put(skb, TCA_CT_PARMS, sizeof(opt), &opt))
1631 goto nla_put_failure;
1632
1633 tcf_tm_dump(&t, &c->tcf_tm);
1634 if (nla_put_64bit(skb, TCA_CT_TM, sizeof(t), &t, TCA_CT_PAD))
1635 goto nla_put_failure;
1636 rcu_read_unlock();
1637
1638 return skb->len;
1639 nla_put_failure:
1640 rcu_read_unlock();
1641 nlmsg_trim(skb, b);
1642 return -1;
1643 }
1644
tcf_stats_update(struct tc_action * a,u64 bytes,u64 packets,u64 drops,u64 lastuse,bool hw)1645 static void tcf_stats_update(struct tc_action *a, u64 bytes, u64 packets,
1646 u64 drops, u64 lastuse, bool hw)
1647 {
1648 struct tcf_ct *c = to_ct(a);
1649
1650 tcf_action_update_stats(a, bytes, packets, drops, hw);
1651 c->tcf_tm.lastuse = max_t(u64, c->tcf_tm.lastuse, lastuse);
1652 }
1653
tcf_ct_offload_act_setup(struct tc_action * act,void * entry_data,u32 * index_inc,bool bind,struct netlink_ext_ack * extack)1654 static int tcf_ct_offload_act_setup(struct tc_action *act, void *entry_data,
1655 u32 *index_inc, bool bind,
1656 struct netlink_ext_ack *extack)
1657 {
1658 if (bind) {
1659 struct flow_action_entry *entry = entry_data;
1660
1661 if (tcf_ct_helper(act))
1662 return -EOPNOTSUPP;
1663
1664 entry->id = FLOW_ACTION_CT;
1665 entry->ct.action = tcf_ct_action(act);
1666 entry->ct.zone = tcf_ct_zone(act);
1667 entry->ct.flow_table = tcf_ct_ft(act);
1668 *index_inc = 1;
1669 } else {
1670 struct flow_offload_action *fl_action = entry_data;
1671
1672 fl_action->id = FLOW_ACTION_CT;
1673 }
1674
1675 return 0;
1676 }
1677
tcf_ct_get_fill_size(const struct tc_action * act)1678 static size_t tcf_ct_get_fill_size(const struct tc_action *act)
1679 {
1680 const struct tcf_ct_params *p;
1681 size_t size;
1682
1683 size = nla_total_size(sizeof(struct tc_ct)) /* TCA_CT_PARMS */
1684 + nla_total_size(sizeof(u16)); /* TCA_CT_ACTION */
1685
1686 rcu_read_lock();
1687 p = rcu_dereference(to_ct(act)->params);
1688
1689 if (p->ct_action & TCA_CT_ACT_CLEAR)
1690 goto out;
1691
1692 /* TCA_CT_MARK, TCA_CT_MARK_MASK */
1693 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK))
1694 size += nla_total_size(sizeof(p->mark))
1695 + nla_total_size(sizeof(p->mark_mask));
1696
1697 /* TCA_CT_LABELS, TCA_CT_LABELS_MASK */
1698 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS))
1699 size += nla_total_size(sizeof(p->labels))
1700 + nla_total_size(sizeof(p->labels_mask));
1701
1702 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES))
1703 size += nla_total_size(sizeof(p->zone)); /* TCA_CT_ZONE */
1704
1705 if (p->ct_action & TCA_CT_ACT_NAT)
1706 /* TCA_CT_NAT_IPV6_{MIN,MAX}, the larger of the two address
1707 * variants, plus TCA_CT_NAT_PORT_{MIN,MAX}.
1708 */
1709 size += 2 * nla_total_size(sizeof(struct in6_addr))
1710 + 2 * nla_total_size(sizeof(__be16));
1711
1712 /* TCA_CT_HELPER_{NAME,FAMILY,PROTO} */
1713 if (p->helper)
1714 size += nla_total_size(NF_CT_HELPER_NAME_LEN)
1715 + nla_total_size(sizeof(u8))
1716 + nla_total_size(sizeof(u8));
1717 out:
1718 rcu_read_unlock();
1719
1720 return size;
1721 }
1722
1723 static struct tc_action_ops act_ct_ops = {
1724 .kind = "ct",
1725 .id = TCA_ID_CT,
1726 .owner = THIS_MODULE,
1727 .act = tcf_ct_act,
1728 .dump = tcf_ct_dump,
1729 .init = tcf_ct_init,
1730 .cleanup = tcf_ct_cleanup,
1731 .stats_update = tcf_stats_update,
1732 .get_fill_size = tcf_ct_get_fill_size,
1733 .offload_act_setup = tcf_ct_offload_act_setup,
1734 .size = sizeof(struct tcf_ct),
1735 };
1736 MODULE_ALIAS_NET_ACT("ct");
1737
ct_init_net(struct net * net)1738 static __net_init int ct_init_net(struct net *net)
1739 {
1740 struct tc_ct_action_net *tn = net_generic(net, act_ct_ops.net_id);
1741
1742 return tc_action_net_init(net, &tn->tn, &act_ct_ops);
1743 }
1744
ct_exit_net(struct list_head * net_list)1745 static void __net_exit ct_exit_net(struct list_head *net_list)
1746 {
1747 tc_action_net_exit(net_list, act_ct_ops.net_id);
1748 }
1749
1750 static struct pernet_operations ct_net_ops = {
1751 .init = ct_init_net,
1752 .exit_batch = ct_exit_net,
1753 .id = &act_ct_ops.net_id,
1754 .size = sizeof(struct tc_ct_action_net),
1755 };
1756
ct_init_module(void)1757 static int __init ct_init_module(void)
1758 {
1759 int err;
1760
1761 act_ct_wq = alloc_ordered_workqueue("act_ct_workqueue", 0);
1762 if (!act_ct_wq)
1763 return -ENOMEM;
1764
1765 err = tcf_ct_flow_tables_init();
1766 if (err)
1767 goto err_tbl_init;
1768
1769 err = tcf_register_action(&act_ct_ops, &ct_net_ops);
1770 if (err)
1771 goto err_register;
1772
1773 static_branch_inc(&tcf_frag_xmit_count);
1774
1775 return 0;
1776
1777 err_register:
1778 tcf_ct_flow_tables_uninit();
1779 err_tbl_init:
1780 destroy_workqueue(act_ct_wq);
1781 return err;
1782 }
1783
ct_cleanup_module(void)1784 static void __exit ct_cleanup_module(void)
1785 {
1786 static_branch_dec(&tcf_frag_xmit_count);
1787 tcf_unregister_action(&act_ct_ops, &ct_net_ops);
1788 tcf_ct_flow_tables_uninit();
1789 destroy_workqueue(act_ct_wq);
1790 }
1791
1792 module_init(ct_init_module);
1793 module_exit(ct_cleanup_module);
1794 MODULE_AUTHOR("Paul Blakey <paulb@mellanox.com>");
1795 MODULE_AUTHOR("Yossi Kuperman <yossiku@mellanox.com>");
1796 MODULE_AUTHOR("Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>");
1797 MODULE_DESCRIPTION("Connection tracking action");
1798 MODULE_LICENSE("GPL v2");
1799