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	#include <net/tc_wrapper.h>
28
29	#include <net/netfilter/nf_flow_table.h>
30	#include <net/netfilter/nf_conntrack.h>
31	#include <net/netfilter/nf_conntrack_core.h>
32	#include <net/netfilter/nf_conntrack_zones.h>
33	#include <net/netfilter/nf_conntrack_helper.h>
34	#include <net/netfilter/nf_conntrack_acct.h>
35	#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
36	#include <net/netfilter/nf_conntrack_act_ct.h>
37	#include <net/netfilter/nf_conntrack_seqadj.h>
38	#include <uapi/linux/netfilter/nf_nat.h>
39
40	static struct workqueue_struct *act_ct_wq;
41	static struct rhashtable zones_ht;
42	static DEFINE_MUTEX(zones_mutex);
43
44	struct zones_ht_key {
45	struct net *net;
46	u16 zone;
47	};
48
49	struct tcf_ct_flow_table {
50	struct rhash_head node; /* In zones tables */
51
52	struct rcu_work rwork;
53	struct nf_flowtable nf_ft;
54	refcount_t ref;
55	struct zones_ht_key key;
56
57	bool dying;
58	};
59
60	static const struct rhashtable_params zones_params = {
61	.head_offset = offsetof(struct tcf_ct_flow_table, node),
62	.key_offset = offsetof(struct tcf_ct_flow_table, key),
63	.key_len = offsetofend(struct zones_ht_key, zone),
64	.automatic_shrinking = true,
65	};
66
67	static struct flow_action_entry *
68	tcf_ct_flow_table_flow_action_get_next(struct flow_action *flow_action)
69	{
70	int i = flow_action->num_entries++;
71
72	return &flow_action->entries[i];
73	}
74
75	static void tcf_ct_add_mangle_action(struct flow_action *action,
76	enum flow_action_mangle_base htype,
77	u32 offset,
78	u32 mask,
79	u32 val)
80	{
81	struct flow_action_entry *entry;
82
83	entry = tcf_ct_flow_table_flow_action_get_next(flow_action: action);
84	entry->id = FLOW_ACTION_MANGLE;
85	entry->mangle.htype = htype;
86	entry->mangle.mask = ~mask;
87	entry->mangle.offset = offset;
88	entry->mangle.val = val;
89	}
90
91	/* The following nat helper functions check if the inverted reverse tuple
92	* (target) is different then the current dir tuple - meaning nat for ports
93	* and/or ip is needed, and add the relevant mangle actions.
94	*/
95	static void
96	tcf_ct_flow_table_add_action_nat_ipv4(const struct nf_conntrack_tuple *tuple,
97	struct nf_conntrack_tuple target,
98	struct flow_action *action)
99	{
100	if (memcmp(p: &target.src.u3, q: &tuple->src.u3, size: sizeof(target.src.u3)))
101	tcf_ct_add_mangle_action(action, htype: FLOW_ACT_MANGLE_HDR_TYPE_IP4,
102	offsetof(struct iphdr, saddr),
103	mask: 0xFFFFFFFF,
104	be32_to_cpu(target.src.u3.ip));
105	if (memcmp(p: &target.dst.u3, q: &tuple->dst.u3, size: sizeof(target.dst.u3)))
106	tcf_ct_add_mangle_action(action, htype: FLOW_ACT_MANGLE_HDR_TYPE_IP4,
107	offsetof(struct iphdr, daddr),
108	mask: 0xFFFFFFFF,
109	be32_to_cpu(target.dst.u3.ip));
110	}
111
112	static void
113	tcf_ct_add_ipv6_addr_mangle_action(struct flow_action *action,
114	union nf_inet_addr *addr,
115	u32 offset)
116	{
117	int i;
118
119	for (i = 0; i < sizeof(struct in6_addr) / sizeof(u32); i++)
120	tcf_ct_add_mangle_action(action, htype: FLOW_ACT_MANGLE_HDR_TYPE_IP6,
121	offset: i * sizeof(u32) + offset,
122	mask: 0xFFFFFFFF, be32_to_cpu(addr->ip6[i]));
123	}
124
125	static void
126	tcf_ct_flow_table_add_action_nat_ipv6(const struct nf_conntrack_tuple *tuple,
127	struct nf_conntrack_tuple target,
128	struct flow_action *action)
129	{
130	if (memcmp(p: &target.src.u3, q: &tuple->src.u3, size: sizeof(target.src.u3)))
131	tcf_ct_add_ipv6_addr_mangle_action(action, addr: &target.src.u3,
132	offsetof(struct ipv6hdr,
133	saddr));
134	if (memcmp(p: &target.dst.u3, q: &tuple->dst.u3, size: sizeof(target.dst.u3)))
135	tcf_ct_add_ipv6_addr_mangle_action(action, addr: &target.dst.u3,
136	offsetof(struct ipv6hdr,
137	daddr));
138	}
139
140	static void
141	tcf_ct_flow_table_add_action_nat_tcp(const struct nf_conntrack_tuple *tuple,
142	struct nf_conntrack_tuple target,
143	struct flow_action *action)
144	{
145	__be16 target_src = target.src.u.tcp.port;
146	__be16 target_dst = target.dst.u.tcp.port;
147
148	if (target_src != tuple->src.u.tcp.port)
149	tcf_ct_add_mangle_action(action, htype: FLOW_ACT_MANGLE_HDR_TYPE_TCP,
150	offsetof(struct tcphdr, source),
151	mask: 0xFFFF, be16_to_cpu(target_src));
152	if (target_dst != tuple->dst.u.tcp.port)
153	tcf_ct_add_mangle_action(action, htype: FLOW_ACT_MANGLE_HDR_TYPE_TCP,
154	offsetof(struct tcphdr, dest),
155	mask: 0xFFFF, be16_to_cpu(target_dst));
156	}
157
158	static void
159	tcf_ct_flow_table_add_action_nat_udp(const struct nf_conntrack_tuple *tuple,
160	struct nf_conntrack_tuple target,
161	struct flow_action *action)
162	{
163	__be16 target_src = target.src.u.udp.port;
164	__be16 target_dst = target.dst.u.udp.port;
165
166	if (target_src != tuple->src.u.udp.port)
167	tcf_ct_add_mangle_action(action, htype: FLOW_ACT_MANGLE_HDR_TYPE_UDP,
168	offsetof(struct udphdr, source),
169	mask: 0xFFFF, be16_to_cpu(target_src));
170	if (target_dst != tuple->dst.u.udp.port)
171	tcf_ct_add_mangle_action(action, htype: FLOW_ACT_MANGLE_HDR_TYPE_UDP,
172	offsetof(struct udphdr, dest),
173	mask: 0xFFFF, be16_to_cpu(target_dst));
174	}
175
176	static void tcf_ct_flow_table_add_action_meta(struct nf_conn *ct,
177	enum ip_conntrack_dir dir,
178	enum ip_conntrack_info ctinfo,
179	struct flow_action *action)
180	{
181	struct nf_conn_labels *ct_labels;
182	struct flow_action_entry *entry;
183	u32 *act_ct_labels;
184
185	entry = tcf_ct_flow_table_flow_action_get_next(flow_action: action);
186	entry->id = FLOW_ACTION_CT_METADATA;
187	#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
188	entry->ct_metadata.mark = READ_ONCE(ct->mark);
189	#endif
190	/* aligns with the CT reference on the SKB nf_ct_set */
191	entry->ct_metadata.cookie = (unsigned long)ct | ctinfo;
192	entry->ct_metadata.orig_dir = dir == IP_CT_DIR_ORIGINAL;
193
194	act_ct_labels = entry->ct_metadata.labels;
195	ct_labels = nf_ct_labels_find(ct);
196	if (ct_labels)
197	memcpy(act_ct_labels, ct_labels->bits, NF_CT_LABELS_MAX_SIZE);
198	else
199	memset(act_ct_labels, 0, NF_CT_LABELS_MAX_SIZE);
200	}
201
202	static int tcf_ct_flow_table_add_action_nat(struct net *net,
203	struct nf_conn *ct,
204	enum ip_conntrack_dir dir,
205	struct flow_action *action)
206	{
207	const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple;
208	struct nf_conntrack_tuple target;
209
210	if (!(ct->status & IPS_NAT_MASK))
211	return 0;
212
213	nf_ct_invert_tuple(inverse: &target, orig: &ct->tuplehash[!dir].tuple);
214
215	switch (tuple->src.l3num) {
216	case NFPROTO_IPV4:
217	tcf_ct_flow_table_add_action_nat_ipv4(tuple, target,
218	action);
219	break;
220	case NFPROTO_IPV6:
221	tcf_ct_flow_table_add_action_nat_ipv6(tuple, target,
222	action);
223	break;
224	default:
225	return -EOPNOTSUPP;
226	}
227
228	switch (nf_ct_protonum(ct)) {
229	case IPPROTO_TCP:
230	tcf_ct_flow_table_add_action_nat_tcp(tuple, target, action);
231	break;
232	case IPPROTO_UDP:
233	tcf_ct_flow_table_add_action_nat_udp(tuple, target, action);
234	break;
235	default:
236	return -EOPNOTSUPP;
237	}
238
239	return 0;
240	}
241
242	static int tcf_ct_flow_table_fill_actions(struct net *net,
243	struct flow_offload *flow,
244	enum flow_offload_tuple_dir tdir,
245	struct nf_flow_rule *flow_rule)
246	{
247	struct flow_action *action = &flow_rule->rule->action;
248	int num_entries = action->num_entries;
249	struct nf_conn *ct = flow->ct;
250	enum ip_conntrack_info ctinfo;
251	enum ip_conntrack_dir dir;
252	int i, err;
253
254	switch (tdir) {
255	case FLOW_OFFLOAD_DIR_ORIGINAL:
256	dir = IP_CT_DIR_ORIGINAL;
257	ctinfo = test_bit(IPS_SEEN_REPLY_BIT, &ct->status) ?
258	IP_CT_ESTABLISHED : IP_CT_NEW;
259	if (ctinfo == IP_CT_ESTABLISHED)
260	set_bit(nr: NF_FLOW_HW_ESTABLISHED, addr: &flow->flags);
261	break;
262	case FLOW_OFFLOAD_DIR_REPLY:
263	dir = IP_CT_DIR_REPLY;
264	ctinfo = IP_CT_ESTABLISHED_REPLY;
265	break;
266	default:
267	return -EOPNOTSUPP;
268	}
269
270	err = tcf_ct_flow_table_add_action_nat(net, ct, dir, action);
271	if (err)
272	goto err_nat;
273
274	tcf_ct_flow_table_add_action_meta(ct, dir, ctinfo, action);
275	return 0;
276
277	err_nat:
278	/* Clear filled actions */
279	for (i = num_entries; i < action->num_entries; i++)
280	memset(&action->entries[i], 0, sizeof(action->entries[i]));
281	action->num_entries = num_entries;
282
283	return err;
284	}
285
286	static bool tcf_ct_flow_is_outdated(const struct flow_offload *flow)
287	{
288	return test_bit(IPS_SEEN_REPLY_BIT, &flow->ct->status) &&
289	test_bit(IPS_HW_OFFLOAD_BIT, &flow->ct->status) &&
290	!test_bit(NF_FLOW_HW_PENDING, &flow->flags) &&
291	!test_bit(NF_FLOW_HW_ESTABLISHED, &flow->flags);
292	}
293
294	static void tcf_ct_flow_table_get_ref(struct tcf_ct_flow_table *ct_ft);
295
296	static void tcf_ct_nf_get(struct nf_flowtable *ft)
297	{
298	struct tcf_ct_flow_table *ct_ft =
299	container_of(ft, struct tcf_ct_flow_table, nf_ft);
300
301	tcf_ct_flow_table_get_ref(ct_ft);
302	}
303
304	static void tcf_ct_flow_table_put(struct tcf_ct_flow_table *ct_ft);
305
306	static void tcf_ct_nf_put(struct nf_flowtable *ft)
307	{
308	struct tcf_ct_flow_table *ct_ft =
309	container_of(ft, struct tcf_ct_flow_table, nf_ft);
310
311	tcf_ct_flow_table_put(ct_ft);
312	}
313
314	static struct nf_flowtable_type flowtable_ct = {
315	.gc = tcf_ct_flow_is_outdated,
316	.action = tcf_ct_flow_table_fill_actions,
317	.get = tcf_ct_nf_get,
318	.put = tcf_ct_nf_put,
319	.owner = THIS_MODULE,
320	};
321
322	static int tcf_ct_flow_table_get(struct net *net, struct tcf_ct_params *params)
323	{
324	struct zones_ht_key key = { .net = net, .zone = params->zone };
325	struct tcf_ct_flow_table *ct_ft;
326	int err = -ENOMEM;
327
328	mutex_lock(&zones_mutex);
329	ct_ft = rhashtable_lookup_fast(ht: &zones_ht, key: &key, params: zones_params);
330	if (ct_ft && refcount_inc_not_zero(r: &ct_ft->ref))
331	goto out_unlock;
332
333	ct_ft = kzalloc(sizeof(*ct_ft), GFP_KERNEL);
334	if (!ct_ft)
335	goto err_alloc;
336	refcount_set(r: &ct_ft->ref, n: 1);
337
338	ct_ft->key = key;
339	err = rhashtable_insert_fast(ht: &zones_ht, obj: &ct_ft->node, params: zones_params);
340	if (err)
341	goto err_insert;
342
343	ct_ft->nf_ft.type = &flowtable_ct;
344	ct_ft->nf_ft.flags |= NF_FLOWTABLE_HW_OFFLOAD |
345	NF_FLOWTABLE_COUNTER;
346	err = nf_flow_table_init(flow_table: &ct_ft->nf_ft);
347	if (err)
348	goto err_init;
349	write_pnet(pnet: &ct_ft->nf_ft.net, net);
350
351	__module_get(THIS_MODULE);
352	out_unlock:
353	params->ct_ft = ct_ft;
354	params->nf_ft = &ct_ft->nf_ft;
355	mutex_unlock(lock: &zones_mutex);
356
357	return 0;
358
359	err_init:
360	rhashtable_remove_fast(ht: &zones_ht, obj: &ct_ft->node, params: zones_params);
361	err_insert:
362	kfree(objp: ct_ft);
363	err_alloc:
364	mutex_unlock(lock: &zones_mutex);
365	return err;
366	}
367
368	static void tcf_ct_flow_table_get_ref(struct tcf_ct_flow_table *ct_ft)
369	{
370	refcount_inc(r: &ct_ft->ref);
371	}
372
373	static void tcf_ct_flow_table_cleanup_work(struct work_struct *work)
374	{
375	struct tcf_ct_flow_table *ct_ft;
376	struct flow_block *block;
377
378	ct_ft = container_of(to_rcu_work(work), struct tcf_ct_flow_table,
379	rwork);
380	nf_flow_table_free(flow_table: &ct_ft->nf_ft);
381
382	block = &ct_ft->nf_ft.flow_block;
383	down_write(sem: &ct_ft->nf_ft.flow_block_lock);
384	WARN_ON(!list_empty(&block->cb_list));
385	up_write(sem: &ct_ft->nf_ft.flow_block_lock);
386	kfree(objp: ct_ft);
387
388	module_put(THIS_MODULE);
389	}
390
391	static void tcf_ct_flow_table_put(struct tcf_ct_flow_table *ct_ft)
392	{
393	if (refcount_dec_and_test(r: &ct_ft->ref)) {
394	rhashtable_remove_fast(ht: &zones_ht, obj: &ct_ft->node, params: zones_params);
395	INIT_RCU_WORK(&ct_ft->rwork, tcf_ct_flow_table_cleanup_work);
396	queue_rcu_work(wq: act_ct_wq, rwork: &ct_ft->rwork);
397	}
398	}
399
400	static void tcf_ct_flow_tc_ifidx(struct flow_offload *entry,
401	struct nf_conn_act_ct_ext *act_ct_ext, u8 dir)
402	{
403	entry->tuplehash[dir].tuple.xmit_type = FLOW_OFFLOAD_XMIT_TC;
404	entry->tuplehash[dir].tuple.tc.iifidx = act_ct_ext->ifindex[dir];
405	}
406
407	static void tcf_ct_flow_ct_ext_ifidx_update(struct flow_offload *entry)
408	{
409	struct nf_conn_act_ct_ext *act_ct_ext;
410
411	act_ct_ext = nf_conn_act_ct_ext_find(ct: entry->ct);
412	if (act_ct_ext) {
413	tcf_ct_flow_tc_ifidx(entry, act_ct_ext, dir: FLOW_OFFLOAD_DIR_ORIGINAL);
414	tcf_ct_flow_tc_ifidx(entry, act_ct_ext, dir: FLOW_OFFLOAD_DIR_REPLY);
415	}
416	}
417
418	static void tcf_ct_flow_table_add(struct tcf_ct_flow_table *ct_ft,
419	struct nf_conn *ct,
420	bool tcp, bool bidirectional)
421	{
422	struct nf_conn_act_ct_ext *act_ct_ext;
423	struct flow_offload *entry;
424	int err;
425
426	if (test_and_set_bit(nr: IPS_OFFLOAD_BIT, addr: &ct->status))
427	return;
428
429	entry = flow_offload_alloc(ct);
430	if (!entry) {
431	WARN_ON_ONCE(1);
432	goto err_alloc;
433	}
434
435	if (tcp) {
436	ct->proto.tcp.seen[0].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
437	ct->proto.tcp.seen[1].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
438	}
439	if (bidirectional)
440	__set_bit(NF_FLOW_HW_BIDIRECTIONAL, &entry->flags);
441
442	act_ct_ext = nf_conn_act_ct_ext_find(ct);
443	if (act_ct_ext) {
444	tcf_ct_flow_tc_ifidx(entry, act_ct_ext, dir: FLOW_OFFLOAD_DIR_ORIGINAL);
445	tcf_ct_flow_tc_ifidx(entry, act_ct_ext, dir: FLOW_OFFLOAD_DIR_REPLY);
446	}
447
448	err = flow_offload_add(flow_table: &ct_ft->nf_ft, flow: entry);
449	if (err)
450	goto err_add;
451
452	return;
453
454	err_add:
455	flow_offload_free(flow: entry);
456	err_alloc:
457	clear_bit(nr: IPS_OFFLOAD_BIT, addr: &ct->status);
458	}
459
460	static void tcf_ct_flow_table_process_conn(struct tcf_ct_flow_table *ct_ft,
461	struct nf_conn *ct,
462	enum ip_conntrack_info ctinfo)
463	{
464	bool tcp = false, bidirectional = true;
465
466	switch (nf_ct_protonum(ct)) {
467	case IPPROTO_TCP:
468	if ((ctinfo != IP_CT_ESTABLISHED &&
469	ctinfo != IP_CT_ESTABLISHED_REPLY) ||
470	!test_bit(IPS_ASSURED_BIT, &ct->status) ||
471	ct->proto.tcp.state != TCP_CONNTRACK_ESTABLISHED)
472	return;
473
474	tcp = true;
475	break;
476	case IPPROTO_UDP:
477	if (!nf_ct_is_confirmed(ct))
478	return;
479	if (!test_bit(IPS_ASSURED_BIT, &ct->status))
480	bidirectional = false;
481	break;
482	#ifdef CONFIG_NF_CT_PROTO_GRE
483	case IPPROTO_GRE: {
484	struct nf_conntrack_tuple *tuple;
485
486	if ((ctinfo != IP_CT_ESTABLISHED &&
487	ctinfo != IP_CT_ESTABLISHED_REPLY) ||
488	!test_bit(IPS_ASSURED_BIT, &ct->status) ||
489	ct->status & IPS_NAT_MASK)
490	return;
491
492	tuple = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
493	/* No support for GRE v1 */
494	if (tuple->src.u.gre.key || tuple->dst.u.gre.key)
495	return;
496	break;
497	}
498	#endif
499	default:
500	return;
501	}
502
503	if (nf_ct_ext_exist(ct, id: NF_CT_EXT_HELPER) ||
504	ct->status & IPS_SEQ_ADJUST)
505	return;
506
507	tcf_ct_flow_table_add(ct_ft, ct, tcp, bidirectional);
508	}
509
510	static bool
511	tcf_ct_flow_table_fill_tuple_ipv4(struct sk_buff *skb,
512	struct flow_offload_tuple *tuple,
513	struct tcphdr **tcph)
514	{
515	struct flow_ports *ports;
516	unsigned int thoff;
517	struct iphdr *iph;
518	size_t hdrsize;
519	u8 ipproto;
520
521	if (!pskb_network_may_pull(skb, len: sizeof(*iph)))
522	return false;
523
524	iph = ip_hdr(skb);
525	thoff = iph->ihl * 4;
526
527	if (ip_is_fragment(iph) ||
528	unlikely(thoff != sizeof(struct iphdr)))
529	return false;
530
531	ipproto = iph->protocol;
532	switch (ipproto) {
533	case IPPROTO_TCP:
534	hdrsize = sizeof(struct tcphdr);
535	break;
536	case IPPROTO_UDP:
537	hdrsize = sizeof(*ports);
538	break;
539	#ifdef CONFIG_NF_CT_PROTO_GRE
540	case IPPROTO_GRE:
541	hdrsize = sizeof(struct gre_base_hdr);
542	break;
543	#endif
544	default:
545	return false;
546	}
547
548	if (iph->ttl <= 1)
549	return false;
550
551	if (!pskb_network_may_pull(skb, len: thoff + hdrsize))
552	return false;
553
554	switch (ipproto) {
555	case IPPROTO_TCP:
556	*tcph = (void *)(skb_network_header(skb) + thoff);
557	fallthrough;
558	case IPPROTO_UDP:
559	ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
560	tuple->src_port = ports->source;
561	tuple->dst_port = ports->dest;
562	break;
563	case IPPROTO_GRE: {
564	struct gre_base_hdr *greh;
565
566	greh = (struct gre_base_hdr *)(skb_network_header(skb) + thoff);
567	if ((greh->flags & GRE_VERSION) != GRE_VERSION_0)
568	return false;
569	break;
570	}
571	}
572
573	iph = ip_hdr(skb);
574
575	tuple->src_v4.s_addr = iph->saddr;
576	tuple->dst_v4.s_addr = iph->daddr;
577	tuple->l3proto = AF_INET;
578	tuple->l4proto = ipproto;
579
580	return true;
581	}
582
583	static bool
584	tcf_ct_flow_table_fill_tuple_ipv6(struct sk_buff *skb,
585	struct flow_offload_tuple *tuple,
586	struct tcphdr **tcph)
587	{
588	struct flow_ports *ports;
589	struct ipv6hdr *ip6h;
590	unsigned int thoff;
591	size_t hdrsize;
592	u8 nexthdr;
593
594	if (!pskb_network_may_pull(skb, len: sizeof(*ip6h)))
595	return false;
596
597	ip6h = ipv6_hdr(skb);
598	thoff = sizeof(*ip6h);
599
600	nexthdr = ip6h->nexthdr;
601	switch (nexthdr) {
602	case IPPROTO_TCP:
603	hdrsize = sizeof(struct tcphdr);
604	break;
605	case IPPROTO_UDP:
606	hdrsize = sizeof(*ports);
607	break;
608	#ifdef CONFIG_NF_CT_PROTO_GRE
609	case IPPROTO_GRE:
610	hdrsize = sizeof(struct gre_base_hdr);
611	break;
612	#endif
613	default:
614	return false;
615	}
616
617	if (ip6h->hop_limit <= 1)
618	return false;
619
620	if (!pskb_network_may_pull(skb, len: thoff + hdrsize))
621	return false;
622
623	switch (nexthdr) {
624	case IPPROTO_TCP:
625	*tcph = (void *)(skb_network_header(skb) + thoff);
626	fallthrough;
627	case IPPROTO_UDP:
628	ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
629	tuple->src_port = ports->source;
630	tuple->dst_port = ports->dest;
631	break;
632	case IPPROTO_GRE: {
633	struct gre_base_hdr *greh;
634
635	greh = (struct gre_base_hdr *)(skb_network_header(skb) + thoff);
636	if ((greh->flags & GRE_VERSION) != GRE_VERSION_0)
637	return false;
638	break;
639	}
640	}
641
642	ip6h = ipv6_hdr(skb);
643
644	tuple->src_v6 = ip6h->saddr;
645	tuple->dst_v6 = ip6h->daddr;
646	tuple->l3proto = AF_INET6;
647	tuple->l4proto = nexthdr;
648
649	return true;
650	}
651
652	static bool tcf_ct_flow_table_lookup(struct tcf_ct_params *p,
653	struct sk_buff *skb,
654	u8 family)
655	{
656	struct nf_flowtable *nf_ft = &p->ct_ft->nf_ft;
657	struct flow_offload_tuple_rhash *tuplehash;
658	struct flow_offload_tuple tuple = {};
659	enum ip_conntrack_info ctinfo;
660	struct tcphdr *tcph = NULL;
661	bool force_refresh = false;
662	struct flow_offload *flow;
663	struct nf_conn *ct;
664	u8 dir;
665
666	switch (family) {
667	case NFPROTO_IPV4:
668	if (!tcf_ct_flow_table_fill_tuple_ipv4(skb, tuple: &tuple, tcph: &tcph))
669	return false;
670	break;
671	case NFPROTO_IPV6:
672	if (!tcf_ct_flow_table_fill_tuple_ipv6(skb, tuple: &tuple, tcph: &tcph))
673	return false;
674	break;
675	default:
676	return false;
677	}
678
679	tuplehash = flow_offload_lookup(flow_table: nf_ft, tuple: &tuple);
680	if (!tuplehash)
681	return false;
682
683	dir = tuplehash->tuple.dir;
684	flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]);
685	ct = flow->ct;
686
687	if (dir == FLOW_OFFLOAD_DIR_REPLY &&
688	!test_bit(NF_FLOW_HW_BIDIRECTIONAL, &flow->flags)) {
689	/* Only offload reply direction after connection became
690	* assured.
691	*/
692	if (test_bit(IPS_ASSURED_BIT, &ct->status))
693	set_bit(nr: NF_FLOW_HW_BIDIRECTIONAL, addr: &flow->flags);
694	else if (test_bit(NF_FLOW_HW_ESTABLISHED, &flow->flags))
695	/* If flow_table flow has already been updated to the
696	* established state, then don't refresh.
697	*/
698	return false;
699	force_refresh = true;
700	}
701
702	if (tcph && (unlikely(tcph->fin || tcph->rst))) {
703	flow_offload_teardown(flow);
704	return false;
705	}
706
707	if (dir == FLOW_OFFLOAD_DIR_ORIGINAL)
708	ctinfo = test_bit(IPS_SEEN_REPLY_BIT, &ct->status) ?
709	IP_CT_ESTABLISHED : IP_CT_NEW;
710	else
711	ctinfo = IP_CT_ESTABLISHED_REPLY;
712
713	nf_conn_act_ct_ext_fill(skb, ct, ctinfo);
714	tcf_ct_flow_ct_ext_ifidx_update(entry: flow);
715	flow_offload_refresh(flow_table: nf_ft, flow, force: force_refresh);
716	if (!test_bit(IPS_ASSURED_BIT, &ct->status)) {
717	/* Process this flow in SW to allow promoting to ASSURED */
718	return false;
719	}
720
721	nf_conntrack_get(nfct: &ct->ct_general);
722	nf_ct_set(skb, ct, info: ctinfo);
723	if (nf_ft->flags & NF_FLOWTABLE_COUNTER)
724	nf_ct_acct_update(ct, dir, bytes: skb->len);
725
726	return true;
727	}
728
729	static int tcf_ct_flow_tables_init(void)
730	{
731	return rhashtable_init(&zones_ht, &zones_params);
732	}
733
734	static void tcf_ct_flow_tables_uninit(void)
735	{
736	rhashtable_destroy(ht: &zones_ht);
737	}
738
739	static struct tc_action_ops act_ct_ops;
740
741	struct tc_ct_action_net {
742	struct tc_action_net tn; /* Must be first */
743	};
744
745	/* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
746	static bool tcf_ct_skb_nfct_cached(struct net *net, struct sk_buff *skb,
747	struct tcf_ct_params *p)
748	{
749	enum ip_conntrack_info ctinfo;
750	struct nf_conn *ct;
751
752	ct = nf_ct_get(skb, ctinfo: &ctinfo);
753	if (!ct)
754	return false;
755	if (!net_eq(net1: net, net2: read_pnet(pnet: &ct->ct_net)))
756	goto drop_ct;
757	if (nf_ct_zone(ct)->id != p->zone)
758	goto drop_ct;
759	if (p->helper) {
760	struct nf_conn_help *help;
761
762	help = nf_ct_ext_find(ct, id: NF_CT_EXT_HELPER);
763	if (help && rcu_access_pointer(help->helper) != p->helper)
764	goto drop_ct;
765	}
766
767	/* Force conntrack entry direction. */
768	if ((p->ct_action & TCA_CT_ACT_FORCE) &&
769	CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
770	if (nf_ct_is_confirmed(ct))
771	nf_ct_kill(ct);
772
773	goto drop_ct;
774	}
775
776	return true;
777
778	drop_ct:
779	nf_ct_put(ct);
780	nf_ct_set(skb, NULL, info: IP_CT_UNTRACKED);
781
782	return false;
783	}
784
785	static u8 tcf_ct_skb_nf_family(struct sk_buff *skb)
786	{
787	u8 family = NFPROTO_UNSPEC;
788
789	switch (skb_protocol(skb, skip_vlan: true)) {
790	case htons(ETH_P_IP):
791	family = NFPROTO_IPV4;
792	break;
793	case htons(ETH_P_IPV6):
794	family = NFPROTO_IPV6;
795	break;
796	default:
797	break;
798	}
799
800	return family;
801	}
802
803	static int tcf_ct_ipv4_is_fragment(struct sk_buff *skb, bool *frag)
804	{
805	unsigned int len;
806
807	len = skb_network_offset(skb) + sizeof(struct iphdr);
808	if (unlikely(skb->len < len))
809	return -EINVAL;
810	if (unlikely(!pskb_may_pull(skb, len)))
811	return -ENOMEM;
812
813	*frag = ip_is_fragment(iph: ip_hdr(skb));
814	return 0;
815	}
816
817	static int tcf_ct_ipv6_is_fragment(struct sk_buff *skb, bool *frag)
818	{
819	unsigned int flags = 0, len, payload_ofs = 0;
820	unsigned short frag_off;
821	int nexthdr;
822
823	len = skb_network_offset(skb) + sizeof(struct ipv6hdr);
824	if (unlikely(skb->len < len))
825	return -EINVAL;
826	if (unlikely(!pskb_may_pull(skb, len)))
827	return -ENOMEM;
828
829	nexthdr = ipv6_find_hdr(skb, offset: &payload_ofs, target: -1, fragoff: &frag_off, fragflg: &flags);
830	if (unlikely(nexthdr < 0))
831	return -EPROTO;
832
833	*frag = flags & IP6_FH_F_FRAG;
834	return 0;
835	}
836
837	static int tcf_ct_handle_fragments(struct net *net, struct sk_buff *skb,
838	u8 family, u16 zone, bool *defrag)
839	{
840	enum ip_conntrack_info ctinfo;
841	struct nf_conn *ct;
842	int err = 0;
843	bool frag;
844	u8 proto;
845	u16 mru;
846
847	/* Previously seen (loopback)? Ignore. */
848	ct = nf_ct_get(skb, ctinfo: &ctinfo);
849	if ((ct && !nf_ct_is_template(ct)) || ctinfo == IP_CT_UNTRACKED)
850	return 0;
851
852	if (family == NFPROTO_IPV4)
853	err = tcf_ct_ipv4_is_fragment(skb, frag: &frag);
854	else
855	err = tcf_ct_ipv6_is_fragment(skb, frag: &frag);
856	if (err || !frag)
857	return err;
858
859	err = nf_ct_handle_fragments(net, skb, zone, family, proto: &proto, mru: &mru);
860	if (err)
861	return err;
862
863	*defrag = true;
864	tc_skb_cb(skb)->mru = mru;
865
866	return 0;
867	}
868
869	static void tcf_ct_params_free(struct tcf_ct_params *params)
870	{
871	if (params->helper) {
872	#if IS_ENABLED(CONFIG_NF_NAT)
873	if (params->ct_action & TCA_CT_ACT_NAT)
874	nf_nat_helper_put(helper: params->helper);
875	#endif
876	nf_conntrack_helper_put(helper: params->helper);
877	}
878	if (params->ct_ft)
879	tcf_ct_flow_table_put(ct_ft: params->ct_ft);
880	if (params->tmpl) {
881	if (params->put_labels)
882	nf_connlabels_put(net: nf_ct_net(ct: params->tmpl));
883
884	nf_ct_put(ct: params->tmpl);
885	}
886
887	kfree(objp: params);
888	}
889
890	static void tcf_ct_params_free_rcu(struct rcu_head *head)
891	{
892	struct tcf_ct_params *params;
893
894	params = container_of(head, struct tcf_ct_params, rcu);
895	tcf_ct_params_free(params);
896	}
897
898	static void tcf_ct_act_set_mark(struct nf_conn *ct, u32 mark, u32 mask)
899	{
900	#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
901	u32 new_mark;
902
903	if (!mask)
904	return;
905
906	new_mark = mark | (READ_ONCE(ct->mark) & ~(mask));
907	if (READ_ONCE(ct->mark) != new_mark) {
908	WRITE_ONCE(ct->mark, new_mark);
909	if (nf_ct_is_confirmed(ct))
910	nf_conntrack_event_cache(event: IPCT_MARK, ct);
911	}
912	#endif
913	}
914
915	static void tcf_ct_act_set_labels(struct nf_conn *ct,
916	u32 *labels,
917	u32 *labels_m)
918	{
919	#if IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)
920	size_t labels_sz = sizeof_field(struct tcf_ct_params, labels);
921
922	if (!memchr_inv(p: labels_m, c: 0, size: labels_sz))
923	return;
924
925	nf_connlabels_replace(ct, data: labels, mask: labels_m, words: 4);
926	#endif
927	}
928
929	static int tcf_ct_act_nat(struct sk_buff *skb,
930	struct nf_conn *ct,
931	enum ip_conntrack_info ctinfo,
932	int ct_action,
933	struct nf_nat_range2 *range,
934	bool commit)
935	{
936	#if IS_ENABLED(CONFIG_NF_NAT)
937	int err, action = 0;
938
939	if (!(ct_action & TCA_CT_ACT_NAT))
940	return NF_ACCEPT;
941	if (ct_action & TCA_CT_ACT_NAT_SRC)
942	action |= BIT(NF_NAT_MANIP_SRC);
943	if (ct_action & TCA_CT_ACT_NAT_DST)
944	action |= BIT(NF_NAT_MANIP_DST);
945
946	err = nf_ct_nat(skb, ct, ctinfo, action: &action, range, commit);
947	if (err != NF_ACCEPT)
948	return err & NF_VERDICT_MASK;
949
950	if (action & BIT(NF_NAT_MANIP_SRC))
951	qdisc_skb_cb(skb)->post_ct_snat = 1;
952	if (action & BIT(NF_NAT_MANIP_DST))
953	qdisc_skb_cb(skb)->post_ct_dnat = 1;
954
955	return err;
956	#else
957	return NF_ACCEPT;
958	#endif
959	}
960
961	TC_INDIRECT_SCOPE int tcf_ct_act(struct sk_buff *skb, const struct tc_action *a,
962	struct tcf_result *res)
963	{
964	struct net *net = dev_net(dev: skb->dev);
965	enum ip_conntrack_info ctinfo;
966	struct tcf_ct *c = to_ct(a);
967	struct nf_conn *tmpl = NULL;
968	struct nf_hook_state state;
969	bool cached, commit, clear;
970	int nh_ofs, err, retval;
971	struct tcf_ct_params *p;
972	bool add_helper = false;
973	bool skip_add = false;
974	bool defrag = false;
975	struct nf_conn *ct;
976	u8 family;
977
978	p = rcu_dereference_bh(c->params);
979
980	retval = p->action;
981	commit = p->ct_action & TCA_CT_ACT_COMMIT;
982	clear = p->ct_action & TCA_CT_ACT_CLEAR;
983	tmpl = p->tmpl;
984
985	tcf_lastuse_update(tm: &c->tcf_tm);
986	tcf_action_update_bstats(a: &c->common, skb);
987
988	if (clear) {
989	qdisc_skb_cb(skb)->post_ct = false;
990	ct = nf_ct_get(skb, ctinfo: &ctinfo);
991	if (ct) {
992	nf_ct_put(ct);
993	nf_ct_set(skb, NULL, info: IP_CT_UNTRACKED);
994	}
995
996	goto out_clear;
997	}
998
999	family = tcf_ct_skb_nf_family(skb);
1000	if (family == NFPROTO_UNSPEC)
1001	goto drop;
1002
1003	/* The conntrack module expects to be working at L3.
1004	* We also try to pull the IPv4/6 header to linear area
1005	*/
1006	nh_ofs = skb_network_offset(skb);
1007	skb_pull_rcsum(skb, len: nh_ofs);
1008	err = tcf_ct_handle_fragments(net, skb, family, zone: p->zone, defrag: &defrag);
1009	if (err)
1010	goto out_frag;
1011
1012	err = nf_ct_skb_network_trim(skb, family);
1013	if (err)
1014	goto drop;
1015
1016	/* If we are recirculating packets to match on ct fields and
1017	* committing with a separate ct action, then we don't need to
1018	* actually run the packet through conntrack twice unless it's for a
1019	* different zone.
1020	*/
1021	cached = tcf_ct_skb_nfct_cached(net, skb, p);
1022	if (!cached) {
1023	if (tcf_ct_flow_table_lookup(p, skb, family)) {
1024	skip_add = true;
1025	goto do_nat;
1026	}
1027
1028	/* Associate skb with specified zone. */
1029	if (tmpl) {
1030	nf_conntrack_put(nfct: skb_nfct(skb));
1031	nf_conntrack_get(nfct: &tmpl->ct_general);
1032	nf_ct_set(skb, ct: tmpl, info: IP_CT_NEW);
1033	}
1034
1035	state.hook = NF_INET_PRE_ROUTING;
1036	state.net = net;
1037	state.pf = family;
1038	err = nf_conntrack_in(skb, state: &state);
1039	if (err != NF_ACCEPT)
1040	goto nf_error;
1041	}
1042
1043	do_nat:
1044	ct = nf_ct_get(skb, ctinfo: &ctinfo);
1045	if (!ct)
1046	goto out_push;
1047	nf_ct_deliver_cached_events(ct);
1048	nf_conn_act_ct_ext_fill(skb, ct, ctinfo);
1049
1050	err = tcf_ct_act_nat(skb, ct, ctinfo, ct_action: p->ct_action, range: &p->range, commit);
1051	if (err != NF_ACCEPT)
1052	goto nf_error;
1053
1054	if (!nf_ct_is_confirmed(ct) && commit && p->helper && !nfct_help(ct)) {
1055	err = __nf_ct_try_assign_helper(ct, tmpl: p->tmpl, GFP_ATOMIC);
1056	if (err)
1057	goto drop;
1058	add_helper = true;
1059	if (p->ct_action & TCA_CT_ACT_NAT && !nfct_seqadj(ct)) {
1060	if (!nfct_seqadj_ext_add(ct))
1061	goto drop;
1062	}
1063	}
1064
1065	if (nf_ct_is_confirmed(ct) ? ((!cached && !skip_add) || add_helper) : commit) {
1066	err = nf_ct_helper(skb, ct, ctinfo, proto: family);
1067	if (err != NF_ACCEPT)
1068	goto nf_error;
1069	}
1070
1071	if (commit) {
1072	tcf_ct_act_set_mark(ct, mark: p->mark, mask: p->mark_mask);
1073	tcf_ct_act_set_labels(ct, labels: p->labels, labels_m: p->labels_mask);
1074
1075	if (!nf_ct_is_confirmed(ct))
1076	nf_conn_act_ct_ext_add(skb, ct, ctinfo);
1077
1078	/* This will take care of sending queued events
1079	* even if the connection is already confirmed.
1080	*/
1081	err = nf_conntrack_confirm(skb);
1082	if (err != NF_ACCEPT)
1083	goto nf_error;
1084
1085	/* The ct may be dropped if a clash has been resolved,
1086	* so it's necessary to retrieve it from skb again to
1087	* prevent UAF.
1088	*/
1089	ct = nf_ct_get(skb, ctinfo: &ctinfo);
1090	if (!ct)
1091	skip_add = true;
1092	}
1093
1094	if (!skip_add)
1095	tcf_ct_flow_table_process_conn(ct_ft: p->ct_ft, ct, ctinfo);
1096
1097	out_push:
1098	skb_push_rcsum(skb, len: nh_ofs);
1099
1100	qdisc_skb_cb(skb)->post_ct = true;
1101	tc_skb_cb(skb)->zone = p->zone;
1102	out_clear:
1103	if (defrag)
1104	qdisc_skb_cb(skb)->pkt_len = skb->len;
1105	return retval;
1106
1107	out_frag:
1108	if (err != -EINPROGRESS)
1109	tcf_action_inc_drop_qstats(a: &c->common);
1110	return TC_ACT_CONSUMED;
1111
1112	drop:
1113	tcf_action_inc_drop_qstats(a: &c->common);
1114	return TC_ACT_SHOT;
1115
1116	nf_error:
1117	/* some verdicts store extra data in upper bits, such
1118	* as errno or queue number.
1119	*/
1120	switch (err & NF_VERDICT_MASK) {
1121	case NF_DROP:
1122	goto drop;
1123	case NF_STOLEN:
1124	tcf_action_inc_drop_qstats(a: &c->common);
1125	return TC_ACT_CONSUMED;
1126	default:
1127	DEBUG_NET_WARN_ON_ONCE(1);
1128	goto drop;
1129	}
1130	}
1131
1132	static const struct nla_policy ct_policy[TCA_CT_MAX + 1] = {
1133	[TCA_CT_ACTION] = { .type = NLA_U16 },
1134	[TCA_CT_PARMS] = NLA_POLICY_EXACT_LEN(sizeof(struct tc_ct)),
1135	[TCA_CT_ZONE] = { .type = NLA_U16 },
1136	[TCA_CT_MARK] = { .type = NLA_U32 },
1137	[TCA_CT_MARK_MASK] = { .type = NLA_U32 },
1138	[TCA_CT_LABELS] = { .type = NLA_BINARY,
1139	.len = 128 / BITS_PER_BYTE },
1140	[TCA_CT_LABELS_MASK] = { .type = NLA_BINARY,
1141	.len = 128 / BITS_PER_BYTE },
1142	[TCA_CT_NAT_IPV4_MIN] = { .type = NLA_U32 },
1143	[TCA_CT_NAT_IPV4_MAX] = { .type = NLA_U32 },
1144	[TCA_CT_NAT_IPV6_MIN] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
1145	[TCA_CT_NAT_IPV6_MAX] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
1146	[TCA_CT_NAT_PORT_MIN] = { .type = NLA_U16 },
1147	[TCA_CT_NAT_PORT_MAX] = { .type = NLA_U16 },
1148	[TCA_CT_HELPER_NAME] = { .type = NLA_STRING, .len = NF_CT_HELPER_NAME_LEN },
1149	[TCA_CT_HELPER_FAMILY] = { .type = NLA_U8 },
1150	[TCA_CT_HELPER_PROTO] = { .type = NLA_U8 },
1151	};
1152
1153	static int tcf_ct_fill_params_nat(struct tcf_ct_params *p,
1154	struct tc_ct *parm,
1155	struct nlattr **tb,
1156	struct netlink_ext_ack *extack)
1157	{
1158	struct nf_nat_range2 *range;
1159
1160	if (!(p->ct_action & TCA_CT_ACT_NAT))
1161	return 0;
1162
1163	if (!IS_ENABLED(CONFIG_NF_NAT)) {
1164	NL_SET_ERR_MSG_MOD(extack, "Netfilter nat isn't enabled in kernel");
1165	return -EOPNOTSUPP;
1166	}
1167
1168	if (!(p->ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST)))
1169	return 0;
1170
1171	if ((p->ct_action & TCA_CT_ACT_NAT_SRC) &&
1172	(p->ct_action & TCA_CT_ACT_NAT_DST)) {
1173	NL_SET_ERR_MSG_MOD(extack, "dnat and snat can't be enabled at the same time");
1174	return -EOPNOTSUPP;
1175	}
1176
1177	range = &p->range;
1178	if (tb[TCA_CT_NAT_IPV4_MIN]) {
1179	struct nlattr *max_attr = tb[TCA_CT_NAT_IPV4_MAX];
1180
1181	p->ipv4_range = true;
1182	range->flags |= NF_NAT_RANGE_MAP_IPS;
1183	range->min_addr.ip =
1184	nla_get_in_addr(nla: tb[TCA_CT_NAT_IPV4_MIN]);
1185
1186	range->max_addr.ip =
1187	nla_get_in_addr_default(nla: max_attr, defvalue: range->min_addr.ip);
1188	} else if (tb[TCA_CT_NAT_IPV6_MIN]) {
1189	struct nlattr *max_attr = tb[TCA_CT_NAT_IPV6_MAX];
1190
1191	p->ipv4_range = false;
1192	range->flags |= NF_NAT_RANGE_MAP_IPS;
1193	range->min_addr.in6 =
1194	nla_get_in6_addr(nla: tb[TCA_CT_NAT_IPV6_MIN]);
1195
1196	range->max_addr.in6 = max_attr ?
1197	nla_get_in6_addr(nla: max_attr) :
1198	range->min_addr.in6;
1199	}
1200
1201	if (tb[TCA_CT_NAT_PORT_MIN]) {
1202	range->flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
1203	range->min_proto.all = nla_get_be16(nla: tb[TCA_CT_NAT_PORT_MIN]);
1204
1205	range->max_proto.all = tb[TCA_CT_NAT_PORT_MAX] ?
1206	nla_get_be16(nla: tb[TCA_CT_NAT_PORT_MAX]) :
1207	range->min_proto.all;
1208	}
1209
1210	return 0;
1211	}
1212
1213	static void tcf_ct_set_key_val(struct nlattr **tb,
1214	void *val, int val_type,
1215	void *mask, int mask_type,
1216	int len)
1217	{
1218	if (!tb[val_type])
1219	return;
1220	nla_memcpy(dest: val, src: tb[val_type], count: len);
1221
1222	if (!mask)
1223	return;
1224
1225	if (mask_type == TCA_CT_UNSPEC || !tb[mask_type])
1226	memset(mask, 0xff, len);
1227	else
1228	nla_memcpy(dest: mask, src: tb[mask_type], count: len);
1229	}
1230
1231	static int tcf_ct_fill_params(struct net *net,
1232	struct tcf_ct_params *p,
1233	struct tc_ct *parm,
1234	struct nlattr **tb,
1235	struct netlink_ext_ack *extack)
1236	{
1237	struct nf_conntrack_zone zone;
1238	int err, family, proto, len;
1239	bool put_labels = false;
1240	struct nf_conn *tmpl;
1241	char *name;
1242
1243	p->zone = NF_CT_DEFAULT_ZONE_ID;
1244
1245	tcf_ct_set_key_val(tb,
1246	val: &p->ct_action, val_type: TCA_CT_ACTION,
1247	NULL, mask_type: TCA_CT_UNSPEC,
1248	len: sizeof(p->ct_action));
1249
1250	if (p->ct_action & TCA_CT_ACT_CLEAR)
1251	return 0;
1252
1253	err = tcf_ct_fill_params_nat(p, parm, tb, extack);
1254	if (err)
1255	return err;
1256
1257	if (tb[TCA_CT_MARK]) {
1258	if (!IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)) {
1259	NL_SET_ERR_MSG_MOD(extack, "Conntrack mark isn't enabled.");
1260	return -EOPNOTSUPP;
1261	}
1262	tcf_ct_set_key_val(tb,
1263	val: &p->mark, val_type: TCA_CT_MARK,
1264	mask: &p->mark_mask, mask_type: TCA_CT_MARK_MASK,
1265	len: sizeof(p->mark));
1266	}
1267
1268	if (tb[TCA_CT_LABELS]) {
1269	unsigned int n_bits = sizeof_field(struct tcf_ct_params, labels) * 8;
1270
1271	if (!IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)) {
1272	NL_SET_ERR_MSG_MOD(extack, "Conntrack labels isn't enabled.");
1273	return -EOPNOTSUPP;
1274	}
1275
1276	if (nf_connlabels_get(net, bit: n_bits - 1)) {
1277	NL_SET_ERR_MSG_MOD(extack, "Failed to set connlabel length");
1278	return -EOPNOTSUPP;
1279	} else {
1280	put_labels = true;
1281	}
1282
1283	tcf_ct_set_key_val(tb,
1284	val: p->labels, val_type: TCA_CT_LABELS,
1285	mask: p->labels_mask, mask_type: TCA_CT_LABELS_MASK,
1286	len: sizeof(p->labels));
1287	}
1288
1289	if (tb[TCA_CT_ZONE]) {
1290	if (!IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES)) {
1291	NL_SET_ERR_MSG_MOD(extack, "Conntrack zones isn't enabled.");
1292	return -EOPNOTSUPP;
1293	}
1294
1295	tcf_ct_set_key_val(tb,
1296	val: &p->zone, val_type: TCA_CT_ZONE,
1297	NULL, mask_type: TCA_CT_UNSPEC,
1298	len: sizeof(p->zone));
1299	}
1300
1301	nf_ct_zone_init(zone: &zone, id: p->zone, NF_CT_DEFAULT_ZONE_DIR, flags: 0);
1302	tmpl = nf_ct_tmpl_alloc(net, zone: &zone, GFP_KERNEL);
1303	if (!tmpl) {
1304	NL_SET_ERR_MSG_MOD(extack, "Failed to allocate conntrack template");
1305	return -ENOMEM;
1306	}
1307	p->tmpl = tmpl;
1308	if (tb[TCA_CT_HELPER_NAME]) {
1309	name = nla_data(nla: tb[TCA_CT_HELPER_NAME]);
1310	len = nla_len(nla: tb[TCA_CT_HELPER_NAME]);
1311	if (len > 16 || name[len - 1] != '\0') {
1312	NL_SET_ERR_MSG_MOD(extack, "Failed to parse helper name.");
1313	err = -EINVAL;
1314	goto err;
1315	}
1316	family = nla_get_u8_default(nla: tb[TCA_CT_HELPER_FAMILY], AF_INET);
1317	proto = nla_get_u8_default(nla: tb[TCA_CT_HELPER_PROTO],
1318	IPPROTO_TCP);
1319	err = nf_ct_add_helper(ct: tmpl, name, family, proto,
1320	nat: p->ct_action & TCA_CT_ACT_NAT, hp: &p->helper);
1321	if (err) {
1322	NL_SET_ERR_MSG_MOD(extack, "Failed to add helper");
1323	goto err;
1324	}
1325	}
1326
1327	p->put_labels = put_labels;
1328
1329	if (p->ct_action & TCA_CT_ACT_COMMIT)
1330	__set_bit(IPS_CONFIRMED_BIT, &tmpl->status);
1331	return 0;
1332	err:
1333	if (put_labels)
1334	nf_connlabels_put(net);
1335
1336	nf_ct_put(ct: p->tmpl);
1337	p->tmpl = NULL;
1338	return err;
1339	}
1340
1341	static int tcf_ct_init(struct net *net, struct nlattr *nla,
1342	struct nlattr *est, struct tc_action **a,
1343	struct tcf_proto *tp, u32 flags,
1344	struct netlink_ext_ack *extack)
1345	{
1346	struct tc_action_net *tn = net_generic(net, id: act_ct_ops.net_id);
1347	bool bind = flags & TCA_ACT_FLAGS_BIND;
1348	struct tcf_ct_params *params = NULL;
1349	struct nlattr *tb[TCA_CT_MAX + 1];
1350	struct tcf_chain *goto_ch = NULL;
1351	struct tc_ct *parm;
1352	struct tcf_ct *c;
1353	int err, res = 0;
1354	u32 index;
1355
1356	if (!nla) {
1357	NL_SET_ERR_MSG_MOD(extack, "Ct requires attributes to be passed");
1358	return -EINVAL;
1359	}
1360
1361	err = nla_parse_nested(tb, TCA_CT_MAX, nla, policy: ct_policy, extack);
1362	if (err < 0)
1363	return err;
1364
1365	if (!tb[TCA_CT_PARMS]) {
1366	NL_SET_ERR_MSG_MOD(extack, "Missing required ct parameters");
1367	return -EINVAL;
1368	}
1369	parm = nla_data(nla: tb[TCA_CT_PARMS]);
1370	index = parm->index;
1371	err = tcf_idr_check_alloc(tn, index: &index, a, bind);
1372	if (err < 0)
1373	return err;
1374
1375	if (!err) {
1376	err = tcf_idr_create_from_flags(tn, index, est, a,
1377	ops: &act_ct_ops, bind, flags);
1378	if (err) {
1379	tcf_idr_cleanup(tn, index);
1380	return err;
1381	}
1382	res = ACT_P_CREATED;
1383	} else {
1384	if (bind)
1385	return ACT_P_BOUND;
1386
1387	if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
1388	tcf_idr_release(a: *a, bind);
1389	return -EEXIST;
1390	}
1391	}
1392	err = tcf_action_check_ctrlact(action: parm->action, tp, handle: &goto_ch, newchain: extack);
1393	if (err < 0)
1394	goto cleanup;
1395
1396	c = to_ct(*a);
1397
1398	params = kzalloc(sizeof(*params), GFP_KERNEL);
1399	if (unlikely(!params)) {
1400	err = -ENOMEM;
1401	goto cleanup;
1402	}
1403
1404	err = tcf_ct_fill_params(net, p: params, parm, tb, extack);
1405	if (err)
1406	goto cleanup;
1407
1408	err = tcf_ct_flow_table_get(net, params);
1409	if (err)
1410	goto cleanup;
1411
1412	params->action = parm->action;
1413	spin_lock_bh(lock: &c->tcf_lock);
1414	goto_ch = tcf_action_set_ctrlact(a: *a, action: parm->action, newchain: goto_ch);
1415	params = rcu_replace_pointer(c->params, params,
1416	lockdep_is_held(&c->tcf_lock));
1417	spin_unlock_bh(lock: &c->tcf_lock);
1418
1419	if (goto_ch)
1420	tcf_chain_put_by_act(chain: goto_ch);
1421	if (params)
1422	call_rcu(head: &params->rcu, func: tcf_ct_params_free_rcu);
1423
1424	return res;
1425
1426	cleanup:
1427	if (goto_ch)
1428	tcf_chain_put_by_act(chain: goto_ch);
1429	if (params)
1430	tcf_ct_params_free(params);
1431	tcf_idr_release(a: *a, bind);
1432	return err;
1433	}
1434
1435	static void tcf_ct_cleanup(struct tc_action *a)
1436	{
1437	struct tcf_ct_params *params;
1438	struct tcf_ct *c = to_ct(a);
1439
1440	params = rcu_dereference_protected(c->params, 1);
1441	if (params)
1442	call_rcu(head: &params->rcu, func: tcf_ct_params_free_rcu);
1443	}
1444
1445	static int tcf_ct_dump_key_val(struct sk_buff *skb,
1446	const void *val, int val_type,
1447	const void *mask, int mask_type,
1448	int len)
1449	{
1450	int err;
1451
1452	if (mask && !memchr_inv(p: mask, c: 0, size: len))
1453	return 0;
1454
1455	err = nla_put(skb, attrtype: val_type, attrlen: len, data: val);
1456	if (err)
1457	return err;
1458
1459	if (mask_type != TCA_CT_UNSPEC) {
1460	err = nla_put(skb, attrtype: mask_type, attrlen: len, data: mask);
1461	if (err)
1462	return err;
1463	}
1464
1465	return 0;
1466	}
1467
1468	static int tcf_ct_dump_nat(struct sk_buff *skb, const struct tcf_ct_params *p)
1469	{
1470	const struct nf_nat_range2 *range = &p->range;
1471
1472	if (!(p->ct_action & TCA_CT_ACT_NAT))
1473	return 0;
1474
1475	if (!(p->ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST)))
1476	return 0;
1477
1478	if (range->flags & NF_NAT_RANGE_MAP_IPS) {
1479	if (p->ipv4_range) {
1480	if (nla_put_in_addr(skb, attrtype: TCA_CT_NAT_IPV4_MIN,
1481	addr: range->min_addr.ip))
1482	return -1;
1483	if (nla_put_in_addr(skb, attrtype: TCA_CT_NAT_IPV4_MAX,
1484	addr: range->max_addr.ip))
1485	return -1;
1486	} else {
1487	if (nla_put_in6_addr(skb, attrtype: TCA_CT_NAT_IPV6_MIN,
1488	addr: &range->min_addr.in6))
1489	return -1;
1490	if (nla_put_in6_addr(skb, attrtype: TCA_CT_NAT_IPV6_MAX,
1491	addr: &range->max_addr.in6))
1492	return -1;
1493	}
1494	}
1495
1496	if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
1497	if (nla_put_be16(skb, attrtype: TCA_CT_NAT_PORT_MIN,
1498	value: range->min_proto.all))
1499	return -1;
1500	if (nla_put_be16(skb, attrtype: TCA_CT_NAT_PORT_MAX,
1501	value: range->max_proto.all))
1502	return -1;
1503	}
1504
1505	return 0;
1506	}
1507
1508	static int tcf_ct_dump_helper(struct sk_buff *skb,
1509	const struct nf_conntrack_helper *helper)
1510	{
1511	if (!helper)
1512	return 0;
1513
1514	if (nla_put_string(skb, attrtype: TCA_CT_HELPER_NAME, str: helper->name) ||
1515	nla_put_u8(skb, attrtype: TCA_CT_HELPER_FAMILY, value: helper->tuple.src.l3num) ||
1516	nla_put_u8(skb, attrtype: TCA_CT_HELPER_PROTO, value: helper->tuple.dst.protonum))
1517	return -1;
1518
1519	return 0;
1520	}
1521
1522	static inline int tcf_ct_dump(struct sk_buff *skb, struct tc_action *a,
1523	int bind, int ref)
1524	{
1525	unsigned char *b = skb_tail_pointer(skb);
1526	const struct tcf_ct *c = to_ct(a);
1527	const struct tcf_ct_params *p;
1528	struct tc_ct opt = {
1529	.index = c->tcf_index,
1530	.refcnt = refcount_read(r: &c->tcf_refcnt) - ref,
1531	.bindcnt = atomic_read(v: &c->tcf_bindcnt) - bind,
1532	};
1533	struct tcf_t t;
1534
1535	rcu_read_lock();
1536	p = rcu_dereference(c->params);
1537	opt.action = p->action;
1538
1539	if (tcf_ct_dump_key_val(skb,
1540	val: &p->ct_action, val_type: TCA_CT_ACTION,
1541	NULL, mask_type: TCA_CT_UNSPEC,
1542	len: sizeof(p->ct_action)))
1543	goto nla_put_failure;
1544
1545	if (p->ct_action & TCA_CT_ACT_CLEAR)
1546	goto skip_dump;
1547
1548	if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
1549	tcf_ct_dump_key_val(skb,
1550	val: &p->mark, val_type: TCA_CT_MARK,
1551	mask: &p->mark_mask, mask_type: TCA_CT_MARK_MASK,
1552	len: sizeof(p->mark)))
1553	goto nla_put_failure;
1554
1555	if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1556	tcf_ct_dump_key_val(skb,
1557	val: p->labels, val_type: TCA_CT_LABELS,
1558	mask: p->labels_mask, mask_type: TCA_CT_LABELS_MASK,
1559	len: sizeof(p->labels)))
1560	goto nla_put_failure;
1561
1562	if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
1563	tcf_ct_dump_key_val(skb,
1564	val: &p->zone, val_type: TCA_CT_ZONE,
1565	NULL, mask_type: TCA_CT_UNSPEC,
1566	len: sizeof(p->zone)))
1567	goto nla_put_failure;
1568
1569	if (tcf_ct_dump_nat(skb, p))
1570	goto nla_put_failure;
1571
1572	if (tcf_ct_dump_helper(skb, helper: p->helper))
1573	goto nla_put_failure;
1574
1575	skip_dump:
1576	if (nla_put(skb, attrtype: TCA_CT_PARMS, attrlen: sizeof(opt), data: &opt))
1577	goto nla_put_failure;
1578
1579	tcf_tm_dump(dtm: &t, stm: &c->tcf_tm);
1580	if (nla_put_64bit(skb, attrtype: TCA_CT_TM, attrlen: sizeof(t), data: &t, padattr: TCA_CT_PAD))
1581	goto nla_put_failure;
1582	rcu_read_unlock();
1583
1584	return skb->len;
1585	nla_put_failure:
1586	rcu_read_unlock();
1587	nlmsg_trim(skb, mark: b);
1588	return -1;
1589	}
1590
1591	static void tcf_stats_update(struct tc_action *a, u64 bytes, u64 packets,
1592	u64 drops, u64 lastuse, bool hw)
1593	{
1594	struct tcf_ct *c = to_ct(a);
1595
1596	tcf_action_update_stats(a, bytes, packets, drops, hw);
1597	c->tcf_tm.lastuse = max_t(u64, c->tcf_tm.lastuse, lastuse);
1598	}
1599
1600	static int tcf_ct_offload_act_setup(struct tc_action *act, void *entry_data,
1601	u32 *index_inc, bool bind,
1602	struct netlink_ext_ack *extack)
1603	{
1604	if (bind) {
1605	struct flow_action_entry *entry = entry_data;
1606
1607	if (tcf_ct_helper(a: act))
1608	return -EOPNOTSUPP;
1609
1610	entry->id = FLOW_ACTION_CT;
1611	entry->ct.action = tcf_ct_action(a: act);
1612	entry->ct.zone = tcf_ct_zone(a: act);
1613	entry->ct.flow_table = tcf_ct_ft(a: act);
1614	*index_inc = 1;
1615	} else {
1616	struct flow_offload_action *fl_action = entry_data;
1617
1618	fl_action->id = FLOW_ACTION_CT;
1619	}
1620
1621	return 0;
1622	}
1623
1624	static struct tc_action_ops act_ct_ops = {
1625	.kind = "ct",
1626	.id = TCA_ID_CT,
1627	.owner = THIS_MODULE,
1628	.act = tcf_ct_act,
1629	.dump = tcf_ct_dump,
1630	.init = tcf_ct_init,
1631	.cleanup = tcf_ct_cleanup,
1632	.stats_update = tcf_stats_update,
1633	.offload_act_setup = tcf_ct_offload_act_setup,
1634	.size = sizeof(struct tcf_ct),
1635	};
1636	MODULE_ALIAS_NET_ACT("ct");
1637
1638	static __net_init int ct_init_net(struct net *net)
1639	{
1640	struct tc_ct_action_net *tn = net_generic(net, id: act_ct_ops.net_id);
1641
1642	return tc_action_net_init(net, tn: &tn->tn, ops: &act_ct_ops);
1643	}
1644
1645	static void __net_exit ct_exit_net(struct list_head *net_list)
1646	{
1647	tc_action_net_exit(net_list, id: act_ct_ops.net_id);
1648	}
1649
1650	static struct pernet_operations ct_net_ops = {
1651	.init = ct_init_net,
1652	.exit_batch = ct_exit_net,
1653	.id = &act_ct_ops.net_id,
1654	.size = sizeof(struct tc_ct_action_net),
1655	};
1656
1657	static int __init ct_init_module(void)
1658	{
1659	int err;
1660
1661	act_ct_wq = alloc_ordered_workqueue("act_ct_workqueue", 0);
1662	if (!act_ct_wq)
1663	return -ENOMEM;
1664
1665	err = tcf_ct_flow_tables_init();
1666	if (err)
1667	goto err_tbl_init;
1668
1669	err = tcf_register_action(a: &act_ct_ops, ops: &ct_net_ops);
1670	if (err)
1671	goto err_register;
1672
1673	static_branch_inc(&tcf_frag_xmit_count);
1674
1675	return 0;
1676
1677	err_register:
1678	tcf_ct_flow_tables_uninit();
1679	err_tbl_init:
1680	destroy_workqueue(wq: act_ct_wq);
1681	return err;
1682	}
1683
1684	static void __exit ct_cleanup_module(void)
1685	{
1686	static_branch_dec(&tcf_frag_xmit_count);
1687	tcf_unregister_action(a: &act_ct_ops, ops: &ct_net_ops);
1688	tcf_ct_flow_tables_uninit();
1689	destroy_workqueue(wq: act_ct_wq);
1690	}
1691
1692	module_init(ct_init_module);
1693	module_exit(ct_cleanup_module);
1694	MODULE_AUTHOR("Paul Blakey <paulb@mellanox.com>");
1695	MODULE_AUTHOR("Yossi Kuperman <yossiku@mellanox.com>");
1696	MODULE_AUTHOR("Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>");
1697	MODULE_DESCRIPTION("Connection tracking action");
1698	MODULE_LICENSE("GPL v2");
1699