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bus: mhi: core: Fix some error return code
[linux/fpc-iii.git] / net / sched / act_ct.c
blob1a766393be625a694a85d40d10e2fe990c4fdbb7
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/ip.h>
17 #include <linux/ipv6.h>
18 #include <linux/rhashtable.h>
19 #include <net/netlink.h>
20 #include <net/pkt_sched.h>
21 #include <net/pkt_cls.h>
22 #include <net/act_api.h>
23 #include <net/ip.h>
24 #include <net/ipv6_frag.h>
25 #include <uapi/linux/tc_act/tc_ct.h>
26 #include <net/tc_act/tc_ct.h>
27
28 #include <net/netfilter/nf_flow_table.h>
29 #include <net/netfilter/nf_conntrack.h>
30 #include <net/netfilter/nf_conntrack_core.h>
31 #include <net/netfilter/nf_conntrack_zones.h>
32 #include <net/netfilter/nf_conntrack_helper.h>
33 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
34 #include <uapi/linux/netfilter/nf_nat.h>
35
36 static struct workqueue_struct *act_ct_wq;
37 static struct rhashtable zones_ht;
38 static DEFINE_MUTEX(zones_mutex);
39
40 struct tcf_ct_flow_table {
41 struct rhash_head node; /* In zones tables */
42
43 struct rcu_work rwork;
44 struct nf_flowtable nf_ft;
45 refcount_t ref;
46 u16 zone;
47
48 bool dying;
49 };
50
51 static const struct rhashtable_params zones_params = {
52 .head_offset = offsetof(struct tcf_ct_flow_table, node),
53 .key_offset = offsetof(struct tcf_ct_flow_table, zone),
54 .key_len = sizeof_field(struct tcf_ct_flow_table, zone),
55 .automatic_shrinking = true,
56 };
57
58 static struct flow_action_entry *
59 tcf_ct_flow_table_flow_action_get_next(struct flow_action *flow_action)
60 {
61 int i = flow_action->num_entries++;
62
63 return &flow_action->entries[i];
64 }
65
66 static void tcf_ct_add_mangle_action(struct flow_action *action,
67 enum flow_action_mangle_base htype,
68 u32 offset,
69 u32 mask,
70 u32 val)
71 {
72 struct flow_action_entry *entry;
73
74 entry = tcf_ct_flow_table_flow_action_get_next(action);
75 entry->id = FLOW_ACTION_MANGLE;
76 entry->mangle.htype = htype;
77 entry->mangle.mask = ~mask;
78 entry->mangle.offset = offset;
79 entry->mangle.val = val;
80 }
81
82 /* The following nat helper functions check if the inverted reverse tuple
83 * (target) is different then the current dir tuple - meaning nat for ports
84 * and/or ip is needed, and add the relevant mangle actions.
85 */
86 static void
87 tcf_ct_flow_table_add_action_nat_ipv4(const struct nf_conntrack_tuple *tuple,
88 struct nf_conntrack_tuple target,
89 struct flow_action *action)
90 {
91 if (memcmp(&target.src.u3, &tuple->src.u3, sizeof(target.src.u3)))
92 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_IP4,
93 offsetof(struct iphdr, saddr),
94 0xFFFFFFFF,
95 be32_to_cpu(target.src.u3.ip));
96 if (memcmp(&target.dst.u3, &tuple->dst.u3, sizeof(target.dst.u3)))
97 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_IP4,
98 offsetof(struct iphdr, daddr),
99 0xFFFFFFFF,
100 be32_to_cpu(target.dst.u3.ip));
101 }
102
103 static void
104 tcf_ct_add_ipv6_addr_mangle_action(struct flow_action *action,
105 union nf_inet_addr *addr,
106 u32 offset)
107 {
108 int i;
109
110 for (i = 0; i < sizeof(struct in6_addr) / sizeof(u32); i++)
111 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_IP6,
112 i * sizeof(u32) + offset,
113 0xFFFFFFFF, be32_to_cpu(addr->ip6[i]));
114 }
115
116 static void
117 tcf_ct_flow_table_add_action_nat_ipv6(const struct nf_conntrack_tuple *tuple,
118 struct nf_conntrack_tuple target,
119 struct flow_action *action)
120 {
121 if (memcmp(&target.src.u3, &tuple->src.u3, sizeof(target.src.u3)))
122 tcf_ct_add_ipv6_addr_mangle_action(action, &target.src.u3,
123 offsetof(struct ipv6hdr,
124 saddr));
125 if (memcmp(&target.dst.u3, &tuple->dst.u3, sizeof(target.dst.u3)))
126 tcf_ct_add_ipv6_addr_mangle_action(action, &target.dst.u3,
127 offsetof(struct ipv6hdr,
128 daddr));
129 }
130
131 static void
132 tcf_ct_flow_table_add_action_nat_tcp(const struct nf_conntrack_tuple *tuple,
133 struct nf_conntrack_tuple target,
134 struct flow_action *action)
135 {
136 __be16 target_src = target.src.u.tcp.port;
137 __be16 target_dst = target.dst.u.tcp.port;
138
139 if (target_src != tuple->src.u.tcp.port)
140 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_TCP,
141 offsetof(struct tcphdr, source),
142 0xFFFF, be16_to_cpu(target_src));
143 if (target_dst != tuple->dst.u.tcp.port)
144 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_TCP,
145 offsetof(struct tcphdr, dest),
146 0xFFFF, be16_to_cpu(target_dst));
147 }
148
149 static void
150 tcf_ct_flow_table_add_action_nat_udp(const struct nf_conntrack_tuple *tuple,
151 struct nf_conntrack_tuple target,
152 struct flow_action *action)
153 {
154 __be16 target_src = target.src.u.udp.port;
155 __be16 target_dst = target.dst.u.udp.port;
156
157 if (target_src != tuple->src.u.udp.port)
158 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_TCP,
159 offsetof(struct udphdr, source),
160 0xFFFF, be16_to_cpu(target_src));
161 if (target_dst != tuple->dst.u.udp.port)
162 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_TCP,
163 offsetof(struct udphdr, dest),
164 0xFFFF, be16_to_cpu(target_dst));
165 }
166
167 static void tcf_ct_flow_table_add_action_meta(struct nf_conn *ct,
168 enum ip_conntrack_dir dir,
169 struct flow_action *action)
170 {
171 struct nf_conn_labels *ct_labels;
172 struct flow_action_entry *entry;
173 enum ip_conntrack_info ctinfo;
174 u32 *act_ct_labels;
175
176 entry = tcf_ct_flow_table_flow_action_get_next(action);
177 entry->id = FLOW_ACTION_CT_METADATA;
178 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
179 entry->ct_metadata.mark = ct->mark;
180 #endif
181 ctinfo = dir == IP_CT_DIR_ORIGINAL ? IP_CT_ESTABLISHED :
182 IP_CT_ESTABLISHED_REPLY;
183 /* aligns with the CT reference on the SKB nf_ct_set */
184 entry->ct_metadata.cookie = (unsigned long)ct | ctinfo;
185
186 act_ct_labels = entry->ct_metadata.labels;
187 ct_labels = nf_ct_labels_find(ct);
188 if (ct_labels)
189 memcpy(act_ct_labels, ct_labels->bits, NF_CT_LABELS_MAX_SIZE);
190 else
191 memset(act_ct_labels, 0, NF_CT_LABELS_MAX_SIZE);
192 }
193
194 static int tcf_ct_flow_table_add_action_nat(struct net *net,
195 struct nf_conn *ct,
196 enum ip_conntrack_dir dir,
197 struct flow_action *action)
198 {
199 const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple;
200 struct nf_conntrack_tuple target;
201
202 nf_ct_invert_tuple(&target, &ct->tuplehash[!dir].tuple);
203
204 switch (tuple->src.l3num) {
205 case NFPROTO_IPV4:
206 tcf_ct_flow_table_add_action_nat_ipv4(tuple, target,
207 action);
208 break;
209 case NFPROTO_IPV6:
210 tcf_ct_flow_table_add_action_nat_ipv6(tuple, target,
211 action);
212 break;
213 default:
214 return -EOPNOTSUPP;
215 }
216
217 switch (nf_ct_protonum(ct)) {
218 case IPPROTO_TCP:
219 tcf_ct_flow_table_add_action_nat_tcp(tuple, target, action);
220 break;
221 case IPPROTO_UDP:
222 tcf_ct_flow_table_add_action_nat_udp(tuple, target, action);
223 break;
224 default:
225 return -EOPNOTSUPP;
226 }
227
228 return 0;
229 }
230
231 static int tcf_ct_flow_table_fill_actions(struct net *net,
232 const struct flow_offload *flow,
233 enum flow_offload_tuple_dir tdir,
234 struct nf_flow_rule *flow_rule)
235 {
236 struct flow_action *action = &flow_rule->rule->action;
237 int num_entries = action->num_entries;
238 struct nf_conn *ct = flow->ct;
239 enum ip_conntrack_dir dir;
240 int i, err;
241
242 switch (tdir) {
243 case FLOW_OFFLOAD_DIR_ORIGINAL:
244 dir = IP_CT_DIR_ORIGINAL;
245 break;
246 case FLOW_OFFLOAD_DIR_REPLY:
247 dir = IP_CT_DIR_REPLY;
248 break;
249 default:
250 return -EOPNOTSUPP;
251 }
252
253 err = tcf_ct_flow_table_add_action_nat(net, ct, dir, action);
254 if (err)
255 goto err_nat;
256
257 tcf_ct_flow_table_add_action_meta(ct, dir, action);
258 return 0;
259
260 err_nat:
261 /* Clear filled actions */
262 for (i = num_entries; i < action->num_entries; i++)
263 memset(&action->entries[i], 0, sizeof(action->entries[i]));
264 action->num_entries = num_entries;
265
266 return err;
267 }
268
269 static struct nf_flowtable_type flowtable_ct = {
270 .action = tcf_ct_flow_table_fill_actions,
271 .owner = THIS_MODULE,
272 };
273
274 static int tcf_ct_flow_table_get(struct tcf_ct_params *params)
275 {
276 struct tcf_ct_flow_table *ct_ft;
277 int err = -ENOMEM;
278
279 mutex_lock(&zones_mutex);
280 ct_ft = rhashtable_lookup_fast(&zones_ht, &params->zone, zones_params);
281 if (ct_ft && refcount_inc_not_zero(&ct_ft->ref))
282 goto out_unlock;
283
284 ct_ft = kzalloc(sizeof(*ct_ft), GFP_KERNEL);
285 if (!ct_ft)
286 goto err_alloc;
287 refcount_set(&ct_ft->ref, 1);
288
289 ct_ft->zone = params->zone;
290 err = rhashtable_insert_fast(&zones_ht, &ct_ft->node, zones_params);
291 if (err)
292 goto err_insert;
293
294 ct_ft->nf_ft.type = &flowtable_ct;
295 ct_ft->nf_ft.flags |= NF_FLOWTABLE_HW_OFFLOAD;
296 err = nf_flow_table_init(&ct_ft->nf_ft);
297 if (err)
298 goto err_init;
299
300 __module_get(THIS_MODULE);
301 out_unlock:
302 params->ct_ft = ct_ft;
303 params->nf_ft = &ct_ft->nf_ft;
304 mutex_unlock(&zones_mutex);
305
306 return 0;
307
308 err_init:
309 rhashtable_remove_fast(&zones_ht, &ct_ft->node, zones_params);
310 err_insert:
311 kfree(ct_ft);
312 err_alloc:
313 mutex_unlock(&zones_mutex);
314 return err;
315 }
316
317 static void tcf_ct_flow_table_cleanup_work(struct work_struct *work)
318 {
319 struct tcf_ct_flow_table *ct_ft;
320
321 ct_ft = container_of(to_rcu_work(work), struct tcf_ct_flow_table,
322 rwork);
323 nf_flow_table_free(&ct_ft->nf_ft);
324 kfree(ct_ft);
325
326 module_put(THIS_MODULE);
327 }
328
329 static void tcf_ct_flow_table_put(struct tcf_ct_params *params)
330 {
331 struct tcf_ct_flow_table *ct_ft = params->ct_ft;
332
333 if (refcount_dec_and_test(&params->ct_ft->ref)) {
334 rhashtable_remove_fast(&zones_ht, &ct_ft->node, zones_params);
335 INIT_RCU_WORK(&ct_ft->rwork, tcf_ct_flow_table_cleanup_work);
336 queue_rcu_work(act_ct_wq, &ct_ft->rwork);
337 }
338 }
339
340 static void tcf_ct_flow_table_add(struct tcf_ct_flow_table *ct_ft,
341 struct nf_conn *ct,
342 bool tcp)
343 {
344 struct flow_offload *entry;
345 int err;
346
347 if (test_and_set_bit(IPS_OFFLOAD_BIT, &ct->status))
348 return;
349
350 entry = flow_offload_alloc(ct);
351 if (!entry) {
352 WARN_ON_ONCE(1);
353 goto err_alloc;
354 }
355
356 if (tcp) {
357 ct->proto.tcp.seen[0].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
358 ct->proto.tcp.seen[1].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
359 }
360
361 err = flow_offload_add(&ct_ft->nf_ft, entry);
362 if (err)
363 goto err_add;
364
365 return;
366
367 err_add:
368 flow_offload_free(entry);
369 err_alloc:
370 clear_bit(IPS_OFFLOAD_BIT, &ct->status);
371 }
372
373 static void tcf_ct_flow_table_process_conn(struct tcf_ct_flow_table *ct_ft,
374 struct nf_conn *ct,
375 enum ip_conntrack_info ctinfo)
376 {
377 bool tcp = false;
378
379 if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
380 return;
381
382 switch (nf_ct_protonum(ct)) {
383 case IPPROTO_TCP:
384 tcp = true;
385 if (ct->proto.tcp.state != TCP_CONNTRACK_ESTABLISHED)
386 return;
387 break;
388 case IPPROTO_UDP:
389 break;
390 default:
391 return;
392 }
393
394 if (nf_ct_ext_exist(ct, NF_CT_EXT_HELPER) ||
395 ct->status & IPS_SEQ_ADJUST)
396 return;
397
398 tcf_ct_flow_table_add(ct_ft, ct, tcp);
399 }
400
401 static bool
402 tcf_ct_flow_table_fill_tuple_ipv4(struct sk_buff *skb,
403 struct flow_offload_tuple *tuple,
404 struct tcphdr **tcph)
405 {
406 struct flow_ports *ports;
407 unsigned int thoff;
408 struct iphdr *iph;
409
410 if (!pskb_network_may_pull(skb, sizeof(*iph)))
411 return false;
412
413 iph = ip_hdr(skb);
414 thoff = iph->ihl * 4;
415
416 if (ip_is_fragment(iph) ||
417 unlikely(thoff != sizeof(struct iphdr)))
418 return false;
419
420 if (iph->protocol != IPPROTO_TCP &&
421 iph->protocol != IPPROTO_UDP)
422 return false;
423
424 if (iph->ttl <= 1)
425 return false;
426
427 if (!pskb_network_may_pull(skb, iph->protocol == IPPROTO_TCP ?
428 thoff + sizeof(struct tcphdr) :
429 thoff + sizeof(*ports)))
430 return false;
431
432 iph = ip_hdr(skb);
433 if (iph->protocol == IPPROTO_TCP)
434 *tcph = (void *)(skb_network_header(skb) + thoff);
435
436 ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
437 tuple->src_v4.s_addr = iph->saddr;
438 tuple->dst_v4.s_addr = iph->daddr;
439 tuple->src_port = ports->source;
440 tuple->dst_port = ports->dest;
441 tuple->l3proto = AF_INET;
442 tuple->l4proto = iph->protocol;
443
444 return true;
445 }
446
447 static bool
448 tcf_ct_flow_table_fill_tuple_ipv6(struct sk_buff *skb,
449 struct flow_offload_tuple *tuple,
450 struct tcphdr **tcph)
451 {
452 struct flow_ports *ports;
453 struct ipv6hdr *ip6h;
454 unsigned int thoff;
455
456 if (!pskb_network_may_pull(skb, sizeof(*ip6h)))
457 return false;
458
459 ip6h = ipv6_hdr(skb);
460
461 if (ip6h->nexthdr != IPPROTO_TCP &&
462 ip6h->nexthdr != IPPROTO_UDP)
463 return false;
464
465 if (ip6h->hop_limit <= 1)
466 return false;
467
468 thoff = sizeof(*ip6h);
469 if (!pskb_network_may_pull(skb, ip6h->nexthdr == IPPROTO_TCP ?
470 thoff + sizeof(struct tcphdr) :
471 thoff + sizeof(*ports)))
472 return false;
473
474 ip6h = ipv6_hdr(skb);
475 if (ip6h->nexthdr == IPPROTO_TCP)
476 *tcph = (void *)(skb_network_header(skb) + thoff);
477
478 ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
479 tuple->src_v6 = ip6h->saddr;
480 tuple->dst_v6 = ip6h->daddr;
481 tuple->src_port = ports->source;
482 tuple->dst_port = ports->dest;
483 tuple->l3proto = AF_INET6;
484 tuple->l4proto = ip6h->nexthdr;
485
486 return true;
487 }
488
489 static bool tcf_ct_flow_table_lookup(struct tcf_ct_params *p,
490 struct sk_buff *skb,
491 u8 family)
492 {
493 struct nf_flowtable *nf_ft = &p->ct_ft->nf_ft;
494 struct flow_offload_tuple_rhash *tuplehash;
495 struct flow_offload_tuple tuple = {};
496 enum ip_conntrack_info ctinfo;
497 struct tcphdr *tcph = NULL;
498 struct flow_offload *flow;
499 struct nf_conn *ct;
500 u8 dir;
501
502 /* Previously seen or loopback */
503 ct = nf_ct_get(skb, &ctinfo);
504 if ((ct && !nf_ct_is_template(ct)) || ctinfo == IP_CT_UNTRACKED)
505 return false;
506
507 switch (family) {
508 case NFPROTO_IPV4:
509 if (!tcf_ct_flow_table_fill_tuple_ipv4(skb, &tuple, &tcph))
510 return false;
511 break;
512 case NFPROTO_IPV6:
513 if (!tcf_ct_flow_table_fill_tuple_ipv6(skb, &tuple, &tcph))
514 return false;
515 break;
516 default:
517 return false;
518 }
519
520 tuplehash = flow_offload_lookup(nf_ft, &tuple);
521 if (!tuplehash)
522 return false;
523
524 dir = tuplehash->tuple.dir;
525 flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]);
526 ct = flow->ct;
527
528 if (tcph && (unlikely(tcph->fin || tcph->rst))) {
529 flow_offload_teardown(flow);
530 return false;
531 }
532
533 ctinfo = dir == FLOW_OFFLOAD_DIR_ORIGINAL ? IP_CT_ESTABLISHED :
534 IP_CT_ESTABLISHED_REPLY;
535
536 flow_offload_refresh(nf_ft, flow);
537 nf_conntrack_get(&ct->ct_general);
538 nf_ct_set(skb, ct, ctinfo);
539
540 return true;
541 }
542
543 static int tcf_ct_flow_tables_init(void)
544 {
545 return rhashtable_init(&zones_ht, &zones_params);
546 }
547
548 static void tcf_ct_flow_tables_uninit(void)
549 {
550 rhashtable_destroy(&zones_ht);
551 }
552
553 static struct tc_action_ops act_ct_ops;
554 static unsigned int ct_net_id;
555
556 struct tc_ct_action_net {
557 struct tc_action_net tn; /* Must be first */
558 bool labels;
559 };
560
561 /* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
562 static bool tcf_ct_skb_nfct_cached(struct net *net, struct sk_buff *skb,
563 u16 zone_id, bool force)
564 {
565 enum ip_conntrack_info ctinfo;
566 struct nf_conn *ct;
567
568 ct = nf_ct_get(skb, &ctinfo);
569 if (!ct)
570 return false;
571 if (!net_eq(net, read_pnet(&ct->ct_net)))
572 return false;
573 if (nf_ct_zone(ct)->id != zone_id)
574 return false;
575
576 /* Force conntrack entry direction. */
577 if (force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
578 if (nf_ct_is_confirmed(ct))
579 nf_ct_kill(ct);
580
581 nf_conntrack_put(&ct->ct_general);
582 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
583
584 return false;
585 }
586
587 return true;
588 }
589
590 /* Trim the skb to the length specified by the IP/IPv6 header,
591 * removing any trailing lower-layer padding. This prepares the skb
592 * for higher-layer processing that assumes skb->len excludes padding
593 * (such as nf_ip_checksum). The caller needs to pull the skb to the
594 * network header, and ensure ip_hdr/ipv6_hdr points to valid data.
595 */
596 static int tcf_ct_skb_network_trim(struct sk_buff *skb, int family)
597 {
598 unsigned int len;
599 int err;
600
601 switch (family) {
602 case NFPROTO_IPV4:
603 len = ntohs(ip_hdr(skb)->tot_len);
604 break;
605 case NFPROTO_IPV6:
606 len = sizeof(struct ipv6hdr)
607 + ntohs(ipv6_hdr(skb)->payload_len);
608 break;
609 default:
610 len = skb->len;
611 }
612
613 err = pskb_trim_rcsum(skb, len);
614
615 return err;
616 }
617
618 static u8 tcf_ct_skb_nf_family(struct sk_buff *skb)
619 {
620 u8 family = NFPROTO_UNSPEC;
621
622 switch (skb->protocol) {
623 case htons(ETH_P_IP):
624 family = NFPROTO_IPV4;
625 break;
626 case htons(ETH_P_IPV6):
627 family = NFPROTO_IPV6;
628 break;
629 default:
630 break;
631 }
632
633 return family;
634 }
635
636 static int tcf_ct_ipv4_is_fragment(struct sk_buff *skb, bool *frag)
637 {
638 unsigned int len;
639
640 len = skb_network_offset(skb) + sizeof(struct iphdr);
641 if (unlikely(skb->len < len))
642 return -EINVAL;
643 if (unlikely(!pskb_may_pull(skb, len)))
644 return -ENOMEM;
645
646 *frag = ip_is_fragment(ip_hdr(skb));
647 return 0;
648 }
649
650 static int tcf_ct_ipv6_is_fragment(struct sk_buff *skb, bool *frag)
651 {
652 unsigned int flags = 0, len, payload_ofs = 0;
653 unsigned short frag_off;
654 int nexthdr;
655
656 len = skb_network_offset(skb) + sizeof(struct ipv6hdr);
657 if (unlikely(skb->len < len))
658 return -EINVAL;
659 if (unlikely(!pskb_may_pull(skb, len)))
660 return -ENOMEM;
661
662 nexthdr = ipv6_find_hdr(skb, &payload_ofs, -1, &frag_off, &flags);
663 if (unlikely(nexthdr < 0))
664 return -EPROTO;
665
666 *frag = flags & IP6_FH_F_FRAG;
667 return 0;
668 }
669
670 static int tcf_ct_handle_fragments(struct net *net, struct sk_buff *skb,
671 u8 family, u16 zone)
672 {
673 enum ip_conntrack_info ctinfo;
674 struct nf_conn *ct;
675 int err = 0;
676 bool frag;
677
678 /* Previously seen (loopback)? Ignore. */
679 ct = nf_ct_get(skb, &ctinfo);
680 if ((ct && !nf_ct_is_template(ct)) || ctinfo == IP_CT_UNTRACKED)
681 return 0;
682
683 if (family == NFPROTO_IPV4)
684 err = tcf_ct_ipv4_is_fragment(skb, &frag);
685 else
686 err = tcf_ct_ipv6_is_fragment(skb, &frag);
687 if (err || !frag)
688 return err;
689
690 skb_get(skb);
691
692 if (family == NFPROTO_IPV4) {
693 enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone;
694
695 memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
696 local_bh_disable();
697 err = ip_defrag(net, skb, user);
698 local_bh_enable();
699 if (err && err != -EINPROGRESS)
700 goto out_free;
701 } else { /* NFPROTO_IPV6 */
702 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
703 enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone;
704
705 memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
706 err = nf_ct_frag6_gather(net, skb, user);
707 if (err && err != -EINPROGRESS)
708 goto out_free;
709 #else
710 err = -EOPNOTSUPP;
711 goto out_free;
712 #endif
713 }
714
715 skb_clear_hash(skb);
716 skb->ignore_df = 1;
717 return err;
718
719 out_free:
720 kfree_skb(skb);
721 return err;
722 }
723
724 static void tcf_ct_params_free(struct rcu_head *head)
725 {
726 struct tcf_ct_params *params = container_of(head,
727 struct tcf_ct_params, rcu);
728
729 tcf_ct_flow_table_put(params);
730
731 if (params->tmpl)
732 nf_conntrack_put(&params->tmpl->ct_general);
733 kfree(params);
734 }
735
736 #if IS_ENABLED(CONFIG_NF_NAT)
737 /* Modelled after nf_nat_ipv[46]_fn().
738 * range is only used for new, uninitialized NAT state.
739 * Returns either NF_ACCEPT or NF_DROP.
740 */
741 static int ct_nat_execute(struct sk_buff *skb, struct nf_conn *ct,
742 enum ip_conntrack_info ctinfo,
743 const struct nf_nat_range2 *range,
744 enum nf_nat_manip_type maniptype)
745 {
746 int hooknum, err = NF_ACCEPT;
747
748 /* See HOOK2MANIP(). */
749 if (maniptype == NF_NAT_MANIP_SRC)
750 hooknum = NF_INET_LOCAL_IN; /* Source NAT */
751 else
752 hooknum = NF_INET_LOCAL_OUT; /* Destination NAT */
753
754 switch (ctinfo) {
755 case IP_CT_RELATED:
756 case IP_CT_RELATED_REPLY:
757 if (skb->protocol == htons(ETH_P_IP) &&
758 ip_hdr(skb)->protocol == IPPROTO_ICMP) {
759 if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo,
760 hooknum))
761 err = NF_DROP;
762 goto out;
763 } else if (IS_ENABLED(CONFIG_IPV6) &&
764 skb->protocol == htons(ETH_P_IPV6)) {
765 __be16 frag_off;
766 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
767 int hdrlen = ipv6_skip_exthdr(skb,
768 sizeof(struct ipv6hdr),
769 &nexthdr, &frag_off);
770
771 if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) {
772 if (!nf_nat_icmpv6_reply_translation(skb, ct,
773 ctinfo,
774 hooknum,
775 hdrlen))
776 err = NF_DROP;
777 goto out;
778 }
779 }
780 /* Non-ICMP, fall thru to initialize if needed. */
781 /* fall through */
782 case IP_CT_NEW:
783 /* Seen it before? This can happen for loopback, retrans,
784 * or local packets.
785 */
786 if (!nf_nat_initialized(ct, maniptype)) {
787 /* Initialize according to the NAT action. */
788 err = (range && range->flags & NF_NAT_RANGE_MAP_IPS)
789 /* Action is set up to establish a new
790 * mapping.
791 */
792 ? nf_nat_setup_info(ct, range, maniptype)
793 : nf_nat_alloc_null_binding(ct, hooknum);
794 if (err != NF_ACCEPT)
795 goto out;
796 }
797 break;
798
799 case IP_CT_ESTABLISHED:
800 case IP_CT_ESTABLISHED_REPLY:
801 break;
802
803 default:
804 err = NF_DROP;
805 goto out;
806 }
807
808 err = nf_nat_packet(ct, ctinfo, hooknum, skb);
809 out:
810 return err;
811 }
812 #endif /* CONFIG_NF_NAT */
813
814 static void tcf_ct_act_set_mark(struct nf_conn *ct, u32 mark, u32 mask)
815 {
816 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
817 u32 new_mark;
818
819 if (!mask)
820 return;
821
822 new_mark = mark | (ct->mark & ~(mask));
823 if (ct->mark != new_mark) {
824 ct->mark = new_mark;
825 if (nf_ct_is_confirmed(ct))
826 nf_conntrack_event_cache(IPCT_MARK, ct);
827 }
828 #endif
829 }
830
831 static void tcf_ct_act_set_labels(struct nf_conn *ct,
832 u32 *labels,
833 u32 *labels_m)
834 {
835 #if IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)
836 size_t labels_sz = sizeof_field(struct tcf_ct_params, labels);
837
838 if (!memchr_inv(labels_m, 0, labels_sz))
839 return;
840
841 nf_connlabels_replace(ct, labels, labels_m, 4);
842 #endif
843 }
844
845 static int tcf_ct_act_nat(struct sk_buff *skb,
846 struct nf_conn *ct,
847 enum ip_conntrack_info ctinfo,
848 int ct_action,
849 struct nf_nat_range2 *range,
850 bool commit)
851 {
852 #if IS_ENABLED(CONFIG_NF_NAT)
853 int err;
854 enum nf_nat_manip_type maniptype;
855
856 if (!(ct_action & TCA_CT_ACT_NAT))
857 return NF_ACCEPT;
858
859 /* Add NAT extension if not confirmed yet. */
860 if (!nf_ct_is_confirmed(ct) && !nf_ct_nat_ext_add(ct))
861 return NF_DROP; /* Can't NAT. */
862
863 if (ctinfo != IP_CT_NEW && (ct->status & IPS_NAT_MASK) &&
864 (ctinfo != IP_CT_RELATED || commit)) {
865 /* NAT an established or related connection like before. */
866 if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY)
867 /* This is the REPLY direction for a connection
868 * for which NAT was applied in the forward
869 * direction. Do the reverse NAT.
870 */
871 maniptype = ct->status & IPS_SRC_NAT
872 ? NF_NAT_MANIP_DST : NF_NAT_MANIP_SRC;
873 else
874 maniptype = ct->status & IPS_SRC_NAT
875 ? NF_NAT_MANIP_SRC : NF_NAT_MANIP_DST;
876 } else if (ct_action & TCA_CT_ACT_NAT_SRC) {
877 maniptype = NF_NAT_MANIP_SRC;
878 } else if (ct_action & TCA_CT_ACT_NAT_DST) {
879 maniptype = NF_NAT_MANIP_DST;
880 } else {
881 return NF_ACCEPT;
882 }
883
884 err = ct_nat_execute(skb, ct, ctinfo, range, maniptype);
885 if (err == NF_ACCEPT &&
886 ct->status & IPS_SRC_NAT && ct->status & IPS_DST_NAT) {
887 if (maniptype == NF_NAT_MANIP_SRC)
888 maniptype = NF_NAT_MANIP_DST;
889 else
890 maniptype = NF_NAT_MANIP_SRC;
891
892 err = ct_nat_execute(skb, ct, ctinfo, range, maniptype);
893 }
894 return err;
895 #else
896 return NF_ACCEPT;
897 #endif
898 }
899
900 static int tcf_ct_act(struct sk_buff *skb, const struct tc_action *a,
901 struct tcf_result *res)
902 {
903 struct net *net = dev_net(skb->dev);
904 bool cached, commit, clear, force;
905 enum ip_conntrack_info ctinfo;
906 struct tcf_ct *c = to_ct(a);
907 struct nf_conn *tmpl = NULL;
908 struct nf_hook_state state;
909 int nh_ofs, err, retval;
910 struct tcf_ct_params *p;
911 bool skip_add = false;
912 struct nf_conn *ct;
913 u8 family;
914
915 p = rcu_dereference_bh(c->params);
916
917 retval = READ_ONCE(c->tcf_action);
918 commit = p->ct_action & TCA_CT_ACT_COMMIT;
919 clear = p->ct_action & TCA_CT_ACT_CLEAR;
920 force = p->ct_action & TCA_CT_ACT_FORCE;
921 tmpl = p->tmpl;
922
923 if (clear) {
924 ct = nf_ct_get(skb, &ctinfo);
925 if (ct) {
926 nf_conntrack_put(&ct->ct_general);
927 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
928 }
929
930 goto out;
931 }
932
933 family = tcf_ct_skb_nf_family(skb);
934 if (family == NFPROTO_UNSPEC)
935 goto drop;
936
937 /* The conntrack module expects to be working at L3.
938 * We also try to pull the IPv4/6 header to linear area
939 */
940 nh_ofs = skb_network_offset(skb);
941 skb_pull_rcsum(skb, nh_ofs);
942 err = tcf_ct_handle_fragments(net, skb, family, p->zone);
943 if (err == -EINPROGRESS) {
944 retval = TC_ACT_STOLEN;
945 goto out;
946 }
947 if (err)
948 goto drop;
949
950 err = tcf_ct_skb_network_trim(skb, family);
951 if (err)
952 goto drop;
953
954 /* If we are recirculating packets to match on ct fields and
955 * committing with a separate ct action, then we don't need to
956 * actually run the packet through conntrack twice unless it's for a
957 * different zone.
958 */
959 cached = tcf_ct_skb_nfct_cached(net, skb, p->zone, force);
960 if (!cached) {
961 if (!commit && tcf_ct_flow_table_lookup(p, skb, family)) {
962 skip_add = true;
963 goto do_nat;
964 }
965
966 /* Associate skb with specified zone. */
967 if (tmpl) {
968 ct = nf_ct_get(skb, &ctinfo);
969 if (skb_nfct(skb))
970 nf_conntrack_put(skb_nfct(skb));
971 nf_conntrack_get(&tmpl->ct_general);
972 nf_ct_set(skb, tmpl, IP_CT_NEW);
973 }
974
975 state.hook = NF_INET_PRE_ROUTING;
976 state.net = net;
977 state.pf = family;
978 err = nf_conntrack_in(skb, &state);
979 if (err != NF_ACCEPT)
980 goto out_push;
981 }
982
983 do_nat:
984 ct = nf_ct_get(skb, &ctinfo);
985 if (!ct)
986 goto out_push;
987 nf_ct_deliver_cached_events(ct);
988
989 err = tcf_ct_act_nat(skb, ct, ctinfo, p->ct_action, &p->range, commit);
990 if (err != NF_ACCEPT)
991 goto drop;
992
993 if (commit) {
994 tcf_ct_act_set_mark(ct, p->mark, p->mark_mask);
995 tcf_ct_act_set_labels(ct, p->labels, p->labels_mask);
996
997 /* This will take care of sending queued events
998 * even if the connection is already confirmed.
999 */
1000 nf_conntrack_confirm(skb);
1001 } else if (!skip_add) {
1002 tcf_ct_flow_table_process_conn(p->ct_ft, ct, ctinfo);
1003 }
1004
1005 out_push:
1006 skb_push_rcsum(skb, nh_ofs);
1007
1008 out:
1009 tcf_action_update_bstats(&c->common, skb);
1010 return retval;
1011
1012 drop:
1013 tcf_action_inc_drop_qstats(&c->common);
1014 return TC_ACT_SHOT;
1015 }
1016
1017 static const struct nla_policy ct_policy[TCA_CT_MAX + 1] = {
1018 [TCA_CT_ACTION] = { .type = NLA_U16 },
1019 [TCA_CT_PARMS] = { .type = NLA_EXACT_LEN, .len = sizeof(struct tc_ct) },
1020 [TCA_CT_ZONE] = { .type = NLA_U16 },
1021 [TCA_CT_MARK] = { .type = NLA_U32 },
1022 [TCA_CT_MARK_MASK] = { .type = NLA_U32 },
1023 [TCA_CT_LABELS] = { .type = NLA_BINARY,
1024 .len = 128 / BITS_PER_BYTE },
1025 [TCA_CT_LABELS_MASK] = { .type = NLA_BINARY,
1026 .len = 128 / BITS_PER_BYTE },
1027 [TCA_CT_NAT_IPV4_MIN] = { .type = NLA_U32 },
1028 [TCA_CT_NAT_IPV4_MAX] = { .type = NLA_U32 },
1029 [TCA_CT_NAT_IPV6_MIN] = { .type = NLA_EXACT_LEN,
1030 .len = sizeof(struct in6_addr) },
1031 [TCA_CT_NAT_IPV6_MAX] = { .type = NLA_EXACT_LEN,
1032 .len = sizeof(struct in6_addr) },
1033 [TCA_CT_NAT_PORT_MIN] = { .type = NLA_U16 },
1034 [TCA_CT_NAT_PORT_MAX] = { .type = NLA_U16 },
1035 };
1036
1037 static int tcf_ct_fill_params_nat(struct tcf_ct_params *p,
1038 struct tc_ct *parm,
1039 struct nlattr **tb,
1040 struct netlink_ext_ack *extack)
1041 {
1042 struct nf_nat_range2 *range;
1043
1044 if (!(p->ct_action & TCA_CT_ACT_NAT))
1045 return 0;
1046
1047 if (!IS_ENABLED(CONFIG_NF_NAT)) {
1048 NL_SET_ERR_MSG_MOD(extack, "Netfilter nat isn't enabled in kernel");
1049 return -EOPNOTSUPP;
1050 }
1051
1052 if (!(p->ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST)))
1053 return 0;
1054
1055 if ((p->ct_action & TCA_CT_ACT_NAT_SRC) &&
1056 (p->ct_action & TCA_CT_ACT_NAT_DST)) {
1057 NL_SET_ERR_MSG_MOD(extack, "dnat and snat can't be enabled at the same time");
1058 return -EOPNOTSUPP;
1059 }
1060
1061 range = &p->range;
1062 if (tb[TCA_CT_NAT_IPV4_MIN]) {
1063 struct nlattr *max_attr = tb[TCA_CT_NAT_IPV4_MAX];
1064
1065 p->ipv4_range = true;
1066 range->flags |= NF_NAT_RANGE_MAP_IPS;
1067 range->min_addr.ip =
1068 nla_get_in_addr(tb[TCA_CT_NAT_IPV4_MIN]);
1069
1070 range->max_addr.ip = max_attr ?
1071 nla_get_in_addr(max_attr) :
1072 range->min_addr.ip;
1073 } else if (tb[TCA_CT_NAT_IPV6_MIN]) {
1074 struct nlattr *max_attr = tb[TCA_CT_NAT_IPV6_MAX];
1075
1076 p->ipv4_range = false;
1077 range->flags |= NF_NAT_RANGE_MAP_IPS;
1078 range->min_addr.in6 =
1079 nla_get_in6_addr(tb[TCA_CT_NAT_IPV6_MIN]);
1080
1081 range->max_addr.in6 = max_attr ?
1082 nla_get_in6_addr(max_attr) :
1083 range->min_addr.in6;
1084 }
1085
1086 if (tb[TCA_CT_NAT_PORT_MIN]) {
1087 range->flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
1088 range->min_proto.all = nla_get_be16(tb[TCA_CT_NAT_PORT_MIN]);
1089
1090 range->max_proto.all = tb[TCA_CT_NAT_PORT_MAX] ?
1091 nla_get_be16(tb[TCA_CT_NAT_PORT_MAX]) :
1092 range->min_proto.all;
1093 }
1094
1095 return 0;
1096 }
1097
1098 static void tcf_ct_set_key_val(struct nlattr **tb,
1099 void *val, int val_type,
1100 void *mask, int mask_type,
1101 int len)
1102 {
1103 if (!tb[val_type])
1104 return;
1105 nla_memcpy(val, tb[val_type], len);
1106
1107 if (!mask)
1108 return;
1109
1110 if (mask_type == TCA_CT_UNSPEC || !tb[mask_type])
1111 memset(mask, 0xff, len);
1112 else
1113 nla_memcpy(mask, tb[mask_type], len);
1114 }
1115
1116 static int tcf_ct_fill_params(struct net *net,
1117 struct tcf_ct_params *p,
1118 struct tc_ct *parm,
1119 struct nlattr **tb,
1120 struct netlink_ext_ack *extack)
1121 {
1122 struct tc_ct_action_net *tn = net_generic(net, ct_net_id);
1123 struct nf_conntrack_zone zone;
1124 struct nf_conn *tmpl;
1125 int err;
1126
1127 p->zone = NF_CT_DEFAULT_ZONE_ID;
1128
1129 tcf_ct_set_key_val(tb,
1130 &p->ct_action, TCA_CT_ACTION,
1131 NULL, TCA_CT_UNSPEC,
1132 sizeof(p->ct_action));
1133
1134 if (p->ct_action & TCA_CT_ACT_CLEAR)
1135 return 0;
1136
1137 err = tcf_ct_fill_params_nat(p, parm, tb, extack);
1138 if (err)
1139 return err;
1140
1141 if (tb[TCA_CT_MARK]) {
1142 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)) {
1143 NL_SET_ERR_MSG_MOD(extack, "Conntrack mark isn't enabled.");
1144 return -EOPNOTSUPP;
1145 }
1146 tcf_ct_set_key_val(tb,
1147 &p->mark, TCA_CT_MARK,
1148 &p->mark_mask, TCA_CT_MARK_MASK,
1149 sizeof(p->mark));
1150 }
1151
1152 if (tb[TCA_CT_LABELS]) {
1153 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)) {
1154 NL_SET_ERR_MSG_MOD(extack, "Conntrack labels isn't enabled.");
1155 return -EOPNOTSUPP;
1156 }
1157
1158 if (!tn->labels) {
1159 NL_SET_ERR_MSG_MOD(extack, "Failed to set connlabel length");
1160 return -EOPNOTSUPP;
1161 }
1162 tcf_ct_set_key_val(tb,
1163 p->labels, TCA_CT_LABELS,
1164 p->labels_mask, TCA_CT_LABELS_MASK,
1165 sizeof(p->labels));
1166 }
1167
1168 if (tb[TCA_CT_ZONE]) {
1169 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES)) {
1170 NL_SET_ERR_MSG_MOD(extack, "Conntrack zones isn't enabled.");
1171 return -EOPNOTSUPP;
1172 }
1173
1174 tcf_ct_set_key_val(tb,
1175 &p->zone, TCA_CT_ZONE,
1176 NULL, TCA_CT_UNSPEC,
1177 sizeof(p->zone));
1178 }
1179
1180 if (p->zone == NF_CT_DEFAULT_ZONE_ID)
1181 return 0;
1182
1183 nf_ct_zone_init(&zone, p->zone, NF_CT_DEFAULT_ZONE_DIR, 0);
1184 tmpl = nf_ct_tmpl_alloc(net, &zone, GFP_KERNEL);
1185 if (!tmpl) {
1186 NL_SET_ERR_MSG_MOD(extack, "Failed to allocate conntrack template");
1187 return -ENOMEM;
1188 }
1189 __set_bit(IPS_CONFIRMED_BIT, &tmpl->status);
1190 nf_conntrack_get(&tmpl->ct_general);
1191 p->tmpl = tmpl;
1192
1193 return 0;
1194 }
1195
1196 static int tcf_ct_init(struct net *net, struct nlattr *nla,
1197 struct nlattr *est, struct tc_action **a,
1198 int replace, int bind, bool rtnl_held,
1199 struct tcf_proto *tp, u32 flags,
1200 struct netlink_ext_ack *extack)
1201 {
1202 struct tc_action_net *tn = net_generic(net, ct_net_id);
1203 struct tcf_ct_params *params = NULL;
1204 struct nlattr *tb[TCA_CT_MAX + 1];
1205 struct tcf_chain *goto_ch = NULL;
1206 struct tc_ct *parm;
1207 struct tcf_ct *c;
1208 int err, res = 0;
1209 u32 index;
1210
1211 if (!nla) {
1212 NL_SET_ERR_MSG_MOD(extack, "Ct requires attributes to be passed");
1213 return -EINVAL;
1214 }
1215
1216 err = nla_parse_nested(tb, TCA_CT_MAX, nla, ct_policy, extack);
1217 if (err < 0)
1218 return err;
1219
1220 if (!tb[TCA_CT_PARMS]) {
1221 NL_SET_ERR_MSG_MOD(extack, "Missing required ct parameters");
1222 return -EINVAL;
1223 }
1224 parm = nla_data(tb[TCA_CT_PARMS]);
1225 index = parm->index;
1226 err = tcf_idr_check_alloc(tn, &index, a, bind);
1227 if (err < 0)
1228 return err;
1229
1230 if (!err) {
1231 err = tcf_idr_create_from_flags(tn, index, est, a,
1232 &act_ct_ops, bind, flags);
1233 if (err) {
1234 tcf_idr_cleanup(tn, index);
1235 return err;
1236 }
1237 res = ACT_P_CREATED;
1238 } else {
1239 if (bind)
1240 return 0;
1241
1242 if (!replace) {
1243 tcf_idr_release(*a, bind);
1244 return -EEXIST;
1245 }
1246 }
1247 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
1248 if (err < 0)
1249 goto cleanup;
1250
1251 c = to_ct(*a);
1252
1253 params = kzalloc(sizeof(*params), GFP_KERNEL);
1254 if (unlikely(!params)) {
1255 err = -ENOMEM;
1256 goto cleanup;
1257 }
1258
1259 err = tcf_ct_fill_params(net, params, parm, tb, extack);
1260 if (err)
1261 goto cleanup;
1262
1263 err = tcf_ct_flow_table_get(params);
1264 if (err)
1265 goto cleanup;
1266
1267 spin_lock_bh(&c->tcf_lock);
1268 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
1269 params = rcu_replace_pointer(c->params, params,
1270 lockdep_is_held(&c->tcf_lock));
1271 spin_unlock_bh(&c->tcf_lock);
1272
1273 if (goto_ch)
1274 tcf_chain_put_by_act(goto_ch);
1275 if (params)
1276 call_rcu(&params->rcu, tcf_ct_params_free);
1277 if (res == ACT_P_CREATED)
1278 tcf_idr_insert(tn, *a);
1279
1280 return res;
1281
1282 cleanup:
1283 if (goto_ch)
1284 tcf_chain_put_by_act(goto_ch);
1285 kfree(params);
1286 tcf_idr_release(*a, bind);
1287 return err;
1288 }
1289
1290 static void tcf_ct_cleanup(struct tc_action *a)
1291 {
1292 struct tcf_ct_params *params;
1293 struct tcf_ct *c = to_ct(a);
1294
1295 params = rcu_dereference_protected(c->params, 1);
1296 if (params)
1297 call_rcu(&params->rcu, tcf_ct_params_free);
1298 }
1299
1300 static int tcf_ct_dump_key_val(struct sk_buff *skb,
1301 void *val, int val_type,
1302 void *mask, int mask_type,
1303 int len)
1304 {
1305 int err;
1306
1307 if (mask && !memchr_inv(mask, 0, len))
1308 return 0;
1309
1310 err = nla_put(skb, val_type, len, val);
1311 if (err)
1312 return err;
1313
1314 if (mask_type != TCA_CT_UNSPEC) {
1315 err = nla_put(skb, mask_type, len, mask);
1316 if (err)
1317 return err;
1318 }
1319
1320 return 0;
1321 }
1322
1323 static int tcf_ct_dump_nat(struct sk_buff *skb, struct tcf_ct_params *p)
1324 {
1325 struct nf_nat_range2 *range = &p->range;
1326
1327 if (!(p->ct_action & TCA_CT_ACT_NAT))
1328 return 0;
1329
1330 if (!(p->ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST)))
1331 return 0;
1332
1333 if (range->flags & NF_NAT_RANGE_MAP_IPS) {
1334 if (p->ipv4_range) {
1335 if (nla_put_in_addr(skb, TCA_CT_NAT_IPV4_MIN,
1336 range->min_addr.ip))
1337 return -1;
1338 if (nla_put_in_addr(skb, TCA_CT_NAT_IPV4_MAX,
1339 range->max_addr.ip))
1340 return -1;
1341 } else {
1342 if (nla_put_in6_addr(skb, TCA_CT_NAT_IPV6_MIN,
1343 &range->min_addr.in6))
1344 return -1;
1345 if (nla_put_in6_addr(skb, TCA_CT_NAT_IPV6_MAX,
1346 &range->max_addr.in6))
1347 return -1;
1348 }
1349 }
1350
1351 if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
1352 if (nla_put_be16(skb, TCA_CT_NAT_PORT_MIN,
1353 range->min_proto.all))
1354 return -1;
1355 if (nla_put_be16(skb, TCA_CT_NAT_PORT_MAX,
1356 range->max_proto.all))
1357 return -1;
1358 }
1359
1360 return 0;
1361 }
1362
1363 static inline int tcf_ct_dump(struct sk_buff *skb, struct tc_action *a,
1364 int bind, int ref)
1365 {
1366 unsigned char *b = skb_tail_pointer(skb);
1367 struct tcf_ct *c = to_ct(a);
1368 struct tcf_ct_params *p;
1369
1370 struct tc_ct opt = {
1371 .index = c->tcf_index,
1372 .refcnt = refcount_read(&c->tcf_refcnt) - ref,
1373 .bindcnt = atomic_read(&c->tcf_bindcnt) - bind,
1374 };
1375 struct tcf_t t;
1376
1377 spin_lock_bh(&c->tcf_lock);
1378 p = rcu_dereference_protected(c->params,
1379 lockdep_is_held(&c->tcf_lock));
1380 opt.action = c->tcf_action;
1381
1382 if (tcf_ct_dump_key_val(skb,
1383 &p->ct_action, TCA_CT_ACTION,
1384 NULL, TCA_CT_UNSPEC,
1385 sizeof(p->ct_action)))
1386 goto nla_put_failure;
1387
1388 if (p->ct_action & TCA_CT_ACT_CLEAR)
1389 goto skip_dump;
1390
1391 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
1392 tcf_ct_dump_key_val(skb,
1393 &p->mark, TCA_CT_MARK,
1394 &p->mark_mask, TCA_CT_MARK_MASK,
1395 sizeof(p->mark)))
1396 goto nla_put_failure;
1397
1398 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1399 tcf_ct_dump_key_val(skb,
1400 p->labels, TCA_CT_LABELS,
1401 p->labels_mask, TCA_CT_LABELS_MASK,
1402 sizeof(p->labels)))
1403 goto nla_put_failure;
1404
1405 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
1406 tcf_ct_dump_key_val(skb,
1407 &p->zone, TCA_CT_ZONE,
1408 NULL, TCA_CT_UNSPEC,
1409 sizeof(p->zone)))
1410 goto nla_put_failure;
1411
1412 if (tcf_ct_dump_nat(skb, p))
1413 goto nla_put_failure;
1414
1415 skip_dump:
1416 if (nla_put(skb, TCA_CT_PARMS, sizeof(opt), &opt))
1417 goto nla_put_failure;
1418
1419 tcf_tm_dump(&t, &c->tcf_tm);
1420 if (nla_put_64bit(skb, TCA_CT_TM, sizeof(t), &t, TCA_CT_PAD))
1421 goto nla_put_failure;
1422 spin_unlock_bh(&c->tcf_lock);
1423
1424 return skb->len;
1425 nla_put_failure:
1426 spin_unlock_bh(&c->tcf_lock);
1427 nlmsg_trim(skb, b);
1428 return -1;
1429 }
1430
1431 static int tcf_ct_walker(struct net *net, struct sk_buff *skb,
1432 struct netlink_callback *cb, int type,
1433 const struct tc_action_ops *ops,
1434 struct netlink_ext_ack *extack)
1435 {
1436 struct tc_action_net *tn = net_generic(net, ct_net_id);
1437
1438 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
1439 }
1440
1441 static int tcf_ct_search(struct net *net, struct tc_action **a, u32 index)
1442 {
1443 struct tc_action_net *tn = net_generic(net, ct_net_id);
1444
1445 return tcf_idr_search(tn, a, index);
1446 }
1447
1448 static void tcf_stats_update(struct tc_action *a, u64 bytes, u32 packets,
1449 u64 lastuse, bool hw)
1450 {
1451 struct tcf_ct *c = to_ct(a);
1452
1453 tcf_action_update_stats(a, bytes, packets, false, hw);
1454 c->tcf_tm.lastuse = max_t(u64, c->tcf_tm.lastuse, lastuse);
1455 }
1456
1457 static struct tc_action_ops act_ct_ops = {
1458 .kind = "ct",
1459 .id = TCA_ID_CT,
1460 .owner = THIS_MODULE,
1461 .act = tcf_ct_act,
1462 .dump = tcf_ct_dump,
1463 .init = tcf_ct_init,
1464 .cleanup = tcf_ct_cleanup,
1465 .walk = tcf_ct_walker,
1466 .lookup = tcf_ct_search,
1467 .stats_update = tcf_stats_update,
1468 .size = sizeof(struct tcf_ct),
1469 };
1470
1471 static __net_init int ct_init_net(struct net *net)
1472 {
1473 unsigned int n_bits = sizeof_field(struct tcf_ct_params, labels) * 8;
1474 struct tc_ct_action_net *tn = net_generic(net, ct_net_id);
1475
1476 if (nf_connlabels_get(net, n_bits - 1)) {
1477 tn->labels = false;
1478 pr_err("act_ct: Failed to set connlabels length");
1479 } else {
1480 tn->labels = true;
1481 }
1482
1483 return tc_action_net_init(net, &tn->tn, &act_ct_ops);
1484 }
1485
1486 static void __net_exit ct_exit_net(struct list_head *net_list)
1487 {
1488 struct net *net;
1489
1490 rtnl_lock();
1491 list_for_each_entry(net, net_list, exit_list) {
1492 struct tc_ct_action_net *tn = net_generic(net, ct_net_id);
1493
1494 if (tn->labels)
1495 nf_connlabels_put(net);
1496 }
1497 rtnl_unlock();
1498
1499 tc_action_net_exit(net_list, ct_net_id);
1500 }
1501
1502 static struct pernet_operations ct_net_ops = {
1503 .init = ct_init_net,
1504 .exit_batch = ct_exit_net,
1505 .id = &ct_net_id,
1506 .size = sizeof(struct tc_ct_action_net),
1507 };
1508
1509 static int __init ct_init_module(void)
1510 {
1511 int err;
1512
1513 act_ct_wq = alloc_ordered_workqueue("act_ct_workqueue", 0);
1514 if (!act_ct_wq)
1515 return -ENOMEM;
1516
1517 err = tcf_ct_flow_tables_init();
1518 if (err)
1519 goto err_tbl_init;
1520
1521 err = tcf_register_action(&act_ct_ops, &ct_net_ops);
1522 if (err)
1523 goto err_register;
1524
1525 return 0;
1526
1527 err_tbl_init:
1528 destroy_workqueue(act_ct_wq);
1529 err_register:
1530 tcf_ct_flow_tables_uninit();
1531 return err;
1532 }
1533
1534 static void __exit ct_cleanup_module(void)
1535 {
1536 tcf_unregister_action(&act_ct_ops, &ct_net_ops);
1537 tcf_ct_flow_tables_uninit();
1538 destroy_workqueue(act_ct_wq);
1539 }
1540
1541 void tcf_ct_flow_table_restore_skb(struct sk_buff *skb, unsigned long cookie)
1542 {
1543 enum ip_conntrack_info ctinfo = cookie & NFCT_INFOMASK;
1544 struct nf_conn *ct;
1545
1546 ct = (struct nf_conn *)(cookie & NFCT_PTRMASK);
1547 nf_conntrack_get(&ct->ct_general);
1548 nf_ct_set(skb, ct, ctinfo);
1549 }
1550 EXPORT_SYMBOL_GPL(tcf_ct_flow_table_restore_skb);
1551
1552 module_init(ct_init_module);
1553 module_exit(ct_cleanup_module);
1554 MODULE_AUTHOR("Paul Blakey <paulb@mellanox.com>");
1555 MODULE_AUTHOR("Yossi Kuperman <yossiku@mellanox.com>");
1556 MODULE_AUTHOR("Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>");
1557 MODULE_DESCRIPTION("Connection tracking action");
1558 MODULE_LICENSE("GPL v2");
1559
Linux with added FPC-III support